WO2024212608A1

WO2024212608A1 - All-size heavy medium beneficiation system and beneficiation method

Info

Publication number: WO2024212608A1
Application number: PCT/CN2023/143058
Authority: WO
Inventors: 董远鹏; 王磊; 张永涛; 王书礼; 孔令斌; 张晋禄
Original assignee: 威海市海王旋流器有限公司
Priority date: 2023-04-13
Filing date: 2023-12-29
Publication date: 2024-10-17
Also published as: CN219850097U

Abstract

The present application relates to the technical field of spodumene ore beneficiation, and in particular to a combined separation system of spodumene ore heavy medium separation and flotation. The system comprises a heavy medium separation system and a flotation system. The heavy medium separation system comprises a heavy medium primary-stage concentrate recovery system, a heavy medium secondary-stage waste discarding system, a heavy medium middling re-crushing and re-selection system, and a fine-size heavy medium separation system. In the heavy medium separation system, a discharge port of a crusher is connected to a grading screen; the grading screen divides spodumene crushed by the crusher into qualified-size products and fine-size products; the qualified-size products undergo separation by the heavy medium primary-stage concentrate recovery system, the heavy medium secondary-stage waste discarding system, and the heavy medium middling re-crushing and re-selection system to obtain gravity concentrates and gravity tailings, and the fine-size products undergo separation by the fine-size heavy medium separation system and the flotation system to obtain fine-size concentrates, flotation concentrates, and flotation tailings. The present application has the advantages of fast capital cost recovery, high economic benefit, low production cost, energy saving and environmental protection, etc.

Description

[Corrected 27.02.2024 according to Rule 26] A combined separation system for heavy medium separation and flotation of spodumene ore

Technical Field

The present application relates to the technical field of spodumene ore dressing, and in particular to a spodumene ore heavy medium separation and flotation combined separation system.

Background Art

Spodumene is one of the main lithium-containing minerals, also known as type 2 spodumene. As the main raw material for lithium chemicals, it is widely used in lithium chemicals, glass, and ceramic industries, and enjoys the reputation of "industrial MSG". In recent years, with the rapid development of the lithium battery industry, the demand for lithium elements has also increased, and the beneficiation of lithium-containing minerals has also attracted more and more attention.

At present, my country mainly extracts lithium from spodumene. The most common beneficiation method for spodumene ore is flotation. The following problems exist when using a single flotation method to recover spodumene ore:

① The applicability and selectivity of traditional collectors are often poor, and the flotation index fluctuates greatly due to the large temperature;

② The "inevitable ions" (Ca2+, Fe3+, Mg2+, etc.) generated during the grinding and flotation process contaminate the mineral surface, making the difference in the floatability of useful minerals and gangue minerals smaller, and the flotation effect is poor. Therefore, it is difficult to obtain spodumene concentrate indicators with higher grade and recovery rate;

③ Spodumene flotation is usually selected in full particle size, with low flotation efficiency, large amount of flotation reagents used in the whole process, high production cost and difficult management.

In summary, the spodumene flotation process has problems such as high production cost, poor economic benefits, and slow capital return.

Utility Model Content

The purpose of this application is to provide a spodumene ore heavy medium separation and flotation combined separation system with high comprehensive ore utilization rate, high economic benefit, fast capital return, less secondary ore slime, less spodumene ore flotation volume entering the mill, energy saving and environmental protection.

The embodiments of the present application can be implemented through the following technical solutions:

A spodumene ore heavy medium sorting and flotation combined sorting system, the combined sorting system comprises a heavy medium sorting system and a flotation system, the heavy medium sorting system comprises a heavy medium first stage concentrate collection system, a heavy medium second stage waste disposal system, a heavy medium middling ore re-crushing and re-selection system and a fine-grained heavy medium sorting system;

The heavy medium separation system includes a crusher, a grading screen, a heavy medium combining barrel, a two-product heavy medium cyclone, a fixed screen, a de-medium screen and a magnetic separator. The discharge port of the crusher is connected to the grading screen. The grading screen divides the spodumene crushed by the crusher into two particle size products, namely, a qualified particle size and a fine particle size. The qualified particle size is separated by the heavy medium first-stage concentrate collection system, the heavy medium second-stage waste disposal system and the heavy medium middling re-crushing and re-separation system to obtain a gravity separation concentrate and a gravity separation tailing. The fine particle size is separated by the fine particle size heavy medium separation system and the flotation system to obtain a fine particle size concentrate, a flotation concentrate and a flotation tailing.

Furthermore, the heavy medium first stage concentrate collection system includes a crusher, a grading screen, a first heavy medium combining barrel, a first two-product heavy medium cyclone, a first concentrate fixed screen, a first concentrate de-mediating screen, a first tailings fixed screen, a first tailings de-mediating screen and a first magnetic separator;

The qualified particle size discharge port of the grading screen is connected to the feed port of the first heavy medium combination barrel through a chute, and the discharge port of the first heavy medium combination barrel is transported to the feed port end of the first two-product heavy medium cyclone through a slurry pump;

The overflow outlet and the underflow outlet of the first two-product heavy medium cyclone are respectively connected to the first tailings fixed screen and the first concentrate fixed screen through pipelines, and the screen product outlets of the first tailings fixed screen and the first concentrate fixed screen are respectively connected to the first tailings de-mediation screen and the first concentrate de-mediation screen;

The undersize products of the first tailings fixed screen and the first concentrate fixed screen are connected to the first heavy medium combining barrel via pipelines, and the undersize product outlets of the first tailings de-mediating screen and the first concentrate de-mediating screen are connected to the first magnetic separator;

The magnetic product outlet of the first magnetic separator is connected to the first heavy medium combination barrel via a pipeline; the non-magnetic product outlet of the first magnetic separator is transported to the return water tank via a pipeline;

The product on the first concentrate de-mediating screen is a re-selected concentrate, and the material on the first tailings de-mediating screen is connected to the heavy medium second-stage discarding system via a belt.

Preferably, the heavy medium first stage collection system further comprises an inspection screening machine, the crusher comprises a coarse crusher, a medium crusher and a first fine crusher, and spodumene passes through the coarse crusher and the medium crusher in sequence and enters the inspection screening machine.

Preferably, the oversize product of the inspection screening machine enters the first fine crusher for crushing again, and the undersize product enters the grading screen.

Furthermore, the heavy medium second-stage waste disposal system includes a second heavy medium combined medium barrel, a second two-product heavy medium cyclone, a second tailings fixed screen, a second tailings de-mediating screen, a second concentrate fixed screen, a second concentrate de-mediating screen and a second magnetic separator;

The discharge port of the first tailings de-medium screen is connected to the feed port of the second heavy medium combining barrel via a chute, and the discharge port of the second heavy medium combining barrel is transported to the feed port end of the second two-product heavy medium cyclone via a slurry pump;

The overflow outlet and the underflow outlet of the second two-product heavy medium cyclone are respectively connected to the second tailings fixed screen and the second concentrate fixed screen through pipelines, and the over-screen product outlets of the second concentrate fixed screen and the second tailings fixed screen are respectively connected to the second concentrate de-mediation screen and the second tailings de-mediation screen;

The undersize products of the second concentrate fixed screen and the second tailings fixed screen are connected to the second heavy medium combining barrel via pipelines, and the undersize product outlets of the second concentrate de-mediating screen and the second tailings de-mediating screen are connected to the second magnetic separator;

The magnetic product outlet of the second magnetic separator is connected to the second heavy medium combining barrel through a pipeline, the non-magnetic product outlet of the second magnetic separator is transported to the return water pool through a pipeline, the screen product of the second tailings de-screen is the heavy-separation tailings, and the screen material of the second concentrate de-screen is connected to the heavy medium middling ore re-crushing and re-separation system through a belt.

Furthermore, the heavy medium ore re-crushing and re-selection system comprises a second fine crusher, the discharge port of the second concentrate de-mediation screen enters the second fine crusher through a belt, and the discharge port of the second fine crusher is connected to the grading screen.

Further, the fine-grained heavy medium separation system includes a third heavy medium combined medium barrel, a third two-product heavy medium cyclone, a concentrate concentration magnetic separator, a concentrate scavenging magnetic separator, a tailings concentration magnetic separator and a tailings scavenging magnetic separator;

The fine-grained material discharge port of the grading screen is connected to the feed port of the third heavy medium combining barrel via a chute, and the discharge port of the third heavy medium combining barrel is transported to the feed port end of the third two-product heavy medium cyclone via a slurry pump;

The overflow outlet and the underflow outlet of the third two-product heavy medium cyclone are respectively connected to the tailings concentrating magnetic separator and the concentrate concentrating magnetic separator through pipelines, and the non-magnetic product outlets of the tailings concentrating magnetic separator and the concentrate concentrating magnetic separator are respectively connected to the tailings scavenging magnetic separator and the concentrate scavenging magnetic separator;

The magnetic product outlets of the concentrate concentrating magnetic separator, the concentrate scavenging magnetic separator, the tailings concentrating magnetic separator and the tailings scavenging magnetic separator are connected to the third heavy medium combining barrel via pipelines, the non-magnetic product outlet of the concentrate scavenging magnetic separator is dehydrated into fine-grained concentrate, and the non-magnetic product outlet of the tailings scavenging magnetic separator is dehydrated and connected to the flotation system.

Furthermore, the flotation system comprises a ball mill, a flotation stirring barrel and a flotation unit, the non-magnetic product outlet of the tailings scavenging magnetic separator is connected to the feed port of the ball mill via a chute, the discharge port of the ball mill is connected to the feed port of the flotation stirring barrel via a pipeline, and the discharge port of the flotation stirring barrel is connected to the feed port of the flotation unit via a pipeline;

After being sorted by the flotation unit, the final foam product is the flotation concentrate, and the final in-tank product is the flotation tailings.

Further, the flotation unit includes a first flotation unit, a second flotation unit, a third flotation unit, a fourth flotation unit, a fifth flotation unit and a sixth flotation unit;

The discharge port of the flotation stirring barrel is connected to the feed port of the first flotation unit through a pipeline, the product outlet of the first flotation unit is connected to the feed port of the second flotation unit through a pipeline, the product in the tank of the second flotation unit is connected to the feed port of the third flotation unit, and the product in the tank of the third flotation unit is flotation tailings;

The foam product outlet of the first flotation unit is connected to the feed port of the fourth flotation unit via a pipeline, the foam product outlet of the fourth flotation unit is connected to the feed port of the fifth flotation unit via a pipeline, the foam product outlet of the fifth flotation unit is connected to the feed port of the sixth flotation unit via a pipeline, and the foam product of the sixth flotation unit is flotation concentrate.

The embodiment of the present application provides a spodumene ore heavy medium separation and flotation combined separation system which has at least the following beneficial effects:

(1) The heavy medium first stage concentrate collection system can complete the separation of target minerals and make the products meet the sales grade requirements. The produced heavy separation concentrate can be sold directly, and the capital return can be completed quickly;

(2) The heavy medium two-stage waste disposal system can complete the separation of spodumene associated minerals and directly discard tailings that are lower than the spodumene industry standard. First, it reduces the amount of ore entering the mill flotation process and reduces production costs; second, it reduces the generation of secondary ore mud and reduces the interference of "inevitable ions" (Ca2+, Fe3+, Mg2+, etc.) on flotation operations, thereby improving the grade of flotation concentrates. The heavy separation tailings produced can be stored or sold directly, quickly completing capital repatriation;

(3) The heavy medium re-crushing and re-selection system can make the dissociation degree of spodumene ore higher, which is conducive to the re-selection of target minerals, extracting more concentrate products, and further discarding gangue minerals;

(4) The fine-grained heavy medium separation system separates the ore into fine-grained minerals. The double magnetic separator separates the medium from the ore, and efficiently separates qualified fine-grained concentrates, which can be sold directly, quickly completing capital repatriation;

(5) The combined heavy medium separation and flotation separation system can increase the flotation concentrate grade by 15% to 20%, reduce the tailings grade by 15% to 25%, and increase the concentrate recovery rate by more than 15%.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a process flow chart of a combined separation system of heavy medium separation and flotation separation of spodumene ore in this application.

Numbers in the figure

1. Coarse crusher, 2. Medium crusher, 3. Inspection screen, 4. First fine crusher, 5. Classification screen, 6. First heavy medium combination barrel, 7. First two-product heavy medium cyclone, 8. First concentrate fixed screen, 9. First concentrate de-mediation screen, 10. First tailings fixed screen, 11. First tailings de-mediation screen, 12. First magnetic separator, 13. Second heavy medium combination barrel, 14. Second two-product heavy medium cyclone, 15. Second tailings fixed screen, 16. Second tailings de-mediation screen, 17. Second concentrate fixed screen, 1 8. Second concentrate de-mediating screen, 19. Second magnetic separator, 20. Second fine crusher, 21. Third heavy medium combining barrel, 22. Third two-product heavy medium cyclone, 23. Concentrate selection magnetic separator, 24. Concentrate scavenging magnetic separator, 25. Tailings selection magnetic separator, 26. Tailings scavenging magnetic separator, 27. Ball mill, 28. Flotation mixing barrel, 29. First flotation unit, 30. Second flotation unit, 31. Third flotation unit, 32. Fourth flotation unit, 33. Fifth flotation unit, 34. Sixth flotation unit.

DETAILED DESCRIPTION

Hereinafter, the present application will be further described based on preferred embodiments with reference to the accompanying drawings.

In addition, various components on the drawings are enlarged (thickened) or reduced (thinned) for ease of understanding, but this practice is not intended to limit the scope of protection of the present application.

Words importing the singular also include the plural and vice versa.

In the description of the embodiments of the present application, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. indicate an orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the products of the embodiments of the present application are usually placed when in use, it is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, in the description of the present application, in order to distinguish different units, the words first, second, etc. are used in this specification, but these are not limited by the order of manufacture, nor can they be understood as indicating or implying relative importance, and their names may be different in the detailed description and claims of the present application.

The vocabulary in this specification is used to illustrate the embodiments of the present application, but is not intended to limit the present application. It should also be noted that, unless otherwise clearly specified and limited, the terms "disposed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, an indirect connection through an intermediate medium, or a connection between the two elements. For those skilled in the art, the specific meanings of the above terms in this application can be specifically understood.

Fig. 1 shows the process flow chart of the combined separation system of heavy medium separation and flotation separation of spodumene ore in the present application. As shown in Fig. 1, the combined separation system includes a heavy medium separation system and a flotation system. The heavy medium separation system includes a heavy medium first stage collection system, a heavy medium second stage waste system, a heavy medium middling re-crushing and re-selection system and a fine-grained heavy medium separation system, wherein the heavy medium first stage collection system can produce a directly sold gravity separation concentrate, the heavy medium second stage waste system can produce a stockpiled or directly sold gravity separation tailings, the heavy medium middling re-crushing and re-selection system can further dissociate the middling product produced by the heavy medium second stage waste system, thereby extracting more gravity separation concentrate products, and the fine-grained heavy medium separation system can produce a directly sold fine-grained concentrate. Thus, the heavy medium separation system can not only produce directly sold gravity separation concentrates, gravity separation tailings and fine-grained concentrates, but also improve the degree of dissociation of the middling products and produce more gravity separation concentrate products.

Specifically, the heavy medium first stage collection system includes a crusher and a grading screen 5. The discharge port of the crusher is connected to the grading screen 5. Spodumene enters from the feed port of the crusher and, after being crushed by the crusher, enters the grading screen 5 from the discharge port of the crusher. The grading screen 5 divides the product into two particle size products, namely, a qualified particle size and a fine particle size.

Preferably, in order to improve the crushing efficiency of the crusher, the crusher in the present application includes a coarse crusher 1, a medium crusher 2 and a first fine crusher 4, and the coarse crusher 1, the medium crusher 2 and the first fine crusher 4 are connected in sequence through pipelines, and the spodumene is crushed to a particle size in which the target mineral and the gangue mineral are basically dissociated through the three-stage crushers of the coarse crusher 1, the medium crusher 2 and the first fine crusher 4 in sequence.

Preferably, in order to further improve the basic dissociation particle size of the target mineral and the gangue mineral, the heavy medium first stage collection system in the present application also includes an inspection screen 3, and the products crushed by the coarse crusher 1 and the medium crusher 2 are passed through the inspection screen 3, wherein the above-screen products of the inspection screen 3 enter the first fine crusher 4 for crushing again, and the below-screen products enter the grading screen 5.

Furthermore, the heavy medium first stage concentrate collection system also includes a first heavy medium combined medium barrel 6, a first two-product heavy medium cyclone 7, a first concentrate fixed screen 8, a first concentrate de-medium screen 9, a first tailings fixed screen 10, a first tailings de-medium screen 11 and a first magnetic separator 12. The qualified particle size discharge port of the grading screen 5 is connected to the feed port of the first heavy medium combined medium barrel 6 through a chute, and the discharge port of the first heavy medium combined medium barrel 6 is transported to the feed port end of the first two-product heavy medium cyclone 7 through a slurry pump. The overflow outlet and underflow outlet of the device 7 are connected to the first tailings fixed screen 10 and the first concentrate fixed screen 8 through pipelines respectively, the undersize products of the first tailings fixed screen 10 and the concentrate fixed screen 8 are connected to the first heavy medium combining barrel 6 through pipelines respectively, the oversize product outlets of the first tailings fixed screen 10 and the first concentrate fixed screen 8 are connected to the first tailings de-mediating screen 11 and the first concentrate de-mediating screen 9 respectively, and the undersize product outlets of the first tailings de-mediating screen 11 and the first concentrate de-mediating screen 9 are connected to the first magnetic separator 12.

Preferably, the magnetic product outlet of the first magnetic separator 12 is connected to the first heavy medium combining barrel 6 via a pipeline, and the non-magnetic product outlet of the first magnetic separator 12 is transported to the return water tank via a pipeline.

Furthermore, the product on the first concentrate de-mediating screen 9 is a gravity-separated concentrate, which can be sold directly, thereby realizing a rapid return of funds.

Furthermore, the material on the first tailings de-screening screen 11 is connected to the heavy medium second-stage waste disposal system via a belt. The heavy medium second-stage waste disposal system sorts the spodumene associated minerals produced by the heavy medium first-stage collection system, and can produce heavy-separation tailings below the spodumene industry standard.

Specifically, the heavy medium two-stage disposal system includes a second heavy medium combining barrel 13, a second two-product heavy medium cyclone 14, a second tailings fixed screen 15, a second tailings de-mediating screen 16, a second concentrate fixed screen 17, a second concentrate de-mediating screen 18 and a second magnetic separator 19.

Specifically, the discharge port of the first tailings de-mediating screen 11 is connected to the feed port of the second heavy medium combining barrel 13 via a chute, the discharge port of the second heavy medium combining barrel 13 is transported to the feed port end of the second two-product heavy medium cyclone 14 via a slurry pump, the overflow outlet and the underflow outlet of the second two-product heavy medium cyclone 14 are respectively connected to the second tailings fixed screen 15 and the second concentrate fixed screen 17 via pipelines, the underscreen products of the second tailings fixed screen 15 and the second concentrate fixed screen 17 are respectively connected to the second heavy medium combining barrel 13 via pipelines, the overscreen product outlets of the second tailings fixed screen 15 and the second concentrate fixed screen 17 are respectively connected to the second tailings de-mediating screen 16 and the second concentrate de-mediating screen 18, and the underscreen product outlets of the second tailings de-mediating screen 16 and the second concentrate de-mediating screen 18 are connected to the second magnetic separator 19.

Preferably, the magnetic product outlet of the first magnetic separator 19 is connected to the second heavy medium combining barrel 13 via a pipeline, and the non-magnetic product outlet of the second magnetic separator 19 is transported to the return water tank via a pipeline.

Furthermore, the product on the second tailings de-mediating screen 16 is a gravity-selected tailings, which can be directly stored or sold to achieve a rapid return of funds, and the product on the second concentrate de-mediating screen 18 is a middling product.

Specifically, in order to further improve the degree of dissociation of the middling ore product, the material on the second concentrate de-mediation screen 18 is connected to the heavy medium middling ore re-crushing and re-selection system via a belt.

Furthermore, the heavy medium ore re-crushing and re-selection system includes a second fine crusher 20. The core of the heavy medium ore re-crushing and re-selection system is to allow the above-screen materials of the heavy medium second-stage waste system concentrate de-mediation screen 18 to enter the second fine crusher 20. The discharge port of the second fine crusher 20 is connected to the grading screen 5. The grading screen 5 divides the products into qualified particle sizes to continue to complete the operations of the heavy medium first-stage concentrate collection system and the heavy medium second-stage waste system.

Specifically, the discharge port of the fine-grained material under the grading screen 5 is connected to the fine-grained heavy medium separation system.

Specifically, the fine-grained heavy medium separation system includes a third heavy medium combining barrel 21, a third two-product heavy medium cyclone 22, a concentrate concentrating magnetic separator 23, a concentrate scavenging magnetic separator 24, a tailings concentrating magnetic separator 25 and a tailings scavenging magnetic separator 26. The heavy medium separation system separates the medium from the ore through the concentrating magnetic separator and the scavenging magnetic separator, and can efficiently select qualified fine-grained concentrate.

Furthermore, the fine-grained material discharge port of the grading screen 5 is connected to the feed port of the third heavy medium combined barrel 21 through a chute, and the discharge port of the third heavy medium combined barrel 21 is transported to the feed port end of the third two-product heavy medium cyclone 22 through a slurry pump, and the overflow outlet and underflow outlet of the third two-product heavy medium cyclone 22 are respectively connected to the tailings concentration magnetic separator 25 and the concentrate concentration magnetic separator 23 through pipelines. The fine-grained heavy medium separation system separates the medium and the ore through a double magnetic separator.

Furthermore, the non-magnetic product outlets of the tailings concentrating magnetic separator 25 and the concentrate concentrating magnetic separator 23 are respectively connected to the tailings scavenging magnetic separator 26 and the concentrate scavenging magnetic separator 24, and the magnetic product outlets of the tailings concentrating magnetic separator 25, the concentrate concentrating magnetic separator 23, the tailings scavenging magnetic separator 26, and the concentrate scavenging magnetic separator 24 are returned to the third heavy medium combining barrel 21 again.

Furthermore, the non-magnetic material outlet of the concentrate scavenging magnetic separator 24 is dehydrated to become flotation concentrate, which can be sold directly to achieve rapid capital return.

Furthermore, the non-magnetic material outlet of the tailings scavenging magnetic separator 26 is connected to the flotation system through dehydration.

Specifically, the flotation system includes a ball mill 27, a flotation mixing barrel 28 and a flotation unit. The tailings discharged from the non-magnetic material outlet of the tailings scavenging magnetic separator 26 are connected to the feed port of the ball mill 27 through a chute. After the tailings enter the ball mill 27 for grinding, they are ground into fine-grained materials with a particle size required by the subsequent flotation process.

Furthermore, the discharge of the ball mill 27 is connected to the feed port of the flotation stirring barrel 28 via a pipeline, and the discharge port of the flotation stirring barrel 28 is connected to the feed port of the flotation unit via a pipeline.

Furthermore, after sorting by the flotation unit, the final foam product is the flotation concentrate, and the final in-tank product is the flotation tailings.

In some preferred embodiments of the present application, the flotation unit includes a first flotation unit 29, a second flotation unit 30, a third flotation unit 31, a fourth flotation unit 32, a fifth flotation unit 33 and a sixth flotation unit 34, and the discharge port of the flotation mixing barrel 28 is connected to the feed port of the first flotation unit 29 through a pipeline.

Specifically, the product outlet of the first flotation unit 29 is connected to the feed port of the second flotation unit 30 via a pipeline, the product in the tank of the second flotation unit 30 is connected to the feed port of the third flotation unit 31, and the product at the product outlet of the third flotation unit 31 is flotation tailings.

Specifically, the foam product outlet of the first flotation unit 29 is connected to the feed port of the fourth flotation unit 32 via a pipeline, the foam product outlet of the fourth flotation unit 32 is connected to the feed port of the fifth flotation unit 33 via a pipeline, the foam product outlet of the fifth flotation unit 33 is connected to the feed port of the sixth flotation unit 34 via a pipeline, and the foam product outlet product of the sixth flotation unit 33 is flotation concentrate.

In some embodiments of the present application, the heavy medium in the first heavy medium combining barrel 6 , the second heavy medium combining barrel 13 and the third first heavy medium combining barrel 21 is made of ferrosilicon powder.

Specifically, the ferrosilicon powder has a magnetic content of ≥95%, a fineness of ‑325 mesh ≥90%, and is free of coking, caking and bonding.

In some embodiments of the present application, the density of the heavy medium suspension in the first heavy medium combining barrel 6, the second heavy medium combining barrel 13 and the third first heavy medium combining barrel 21 is 1.70-3.20 g/m3.

In some embodiments of the present application, the heavy medium suspension and the ore on the grading screen 5 are fed into a two-product heavy medium cyclone at a pressure of 0.08MPa to 0.25MPa through a slurry pump, and are sorted under the action of centrifugal force. The bottom flow product of the two-product heavy medium cyclone is subsequently treated to become a heavy medium concentrate, and the overflow product is subsequently treated to become waste rock.

Specifically, the slurry pump is connected to a variable frequency motor, and the feeding pressure is achieved by adjusting the frequency of the slurry pump by the variable frequency motor.

In some embodiments of the present application, the tailings after fine-grained heavy medium sorting are fed into the ball mill 27, and the tailings are ground to -200 mesh, accounting for 60% to 90%.

In some embodiments of the present application, the adjusting agent, the collecting agent and the frother are sequentially added into the flotation stirring barrel 28, and after stirring for a certain period of time, they are fed into the flotation machine for recovery.

Example

A spodumene mine in Xinjiang has a raw ore Li2O grade of 1.50%. The spodumene is sorted using a heavy medium sorting system and a flotation combined sorting system. The specific steps are as follows: First, the raw ore is fed from the silo to the crusher via the feeder for crushing. It is crushed to -6mm in three stages by the coarse crusher 1, the medium crusher 2, and the first fine crusher 4. The products below -6mm are screened and screened by the grading screen 5 to obtain 0.5-6mm particle size and -0.5mm and below particle size. The 0.5-6mm particle size product is used as the feed for the heavy medium sorting system, and the -0.5mm particle size product is fed into the subsequent fine-grained heavy medium sorting operation.

In the first heavy medium mixing barrel 6, ferrosilicon powder (magnetic content ≥ 95%, fineness ‑325 mesh ≥ 90%) and water are mixed into a heavy medium suspension with a density of 2.40 g/m3, and after being evenly mixed with the 0.5-6 mm particle size ore on the grading screen 5, it is sent to the first two-product heavy medium cyclone 7 for sorting by a slurry pump to obtain a sand settling product and an overflow product. The sand settling products after sorting are sequentially passed through the first concentrate fixed screen 8 and the first concentrate de-mediating screen 9, and after being rinsed with water, the heavy medium is removed. The screen product of the first concentrate de-mediating screen 9 is a re-selected concentrate with a grade of 5.50%. The overflow products after sorting are sequentially passed through the first tailings fixed screen 10 and the first tailings de-mediating screen 11, and after being rinsed with water, the heavy medium is removed. The screen product of the first tailings de-mediating screen 11 is a first-stage tailings, which enters the heavy medium second-stage waste disposal system; the tailings disposal rate of this operation is 20%, and the operation recovery rate is 70.53%;

In the second heavy medium mixing barrel 13, ferrosilicon powder (magnetic content ≥ 95%, fineness ‑325 mesh ≥ 90%) and water are mixed into a heavy medium suspension with a density of 2.00 g/m3, and after being evenly mixed with the tailings after the first stage of heavy medium collection, the suspension is sent to the second two-product heavy medium cyclone 14 for sorting by a slurry pump to obtain a sand settling product and an overflow product. The overflow products after sorting are passed through the second tailings fixed screen 15 and the second tailings de-mediating screen 16 in turn, and after being rinsed with water, the heavy medium is removed. The screened products of the second tailings de-mediating screen 16 are low-grade gravity-selected tailings, which can be directly used for filling or selling. The grade of gravity-selected tailings is 0.25%. The sedimentation products after sorting are passed through the second concentrate fixed screen 17 and the second concentrate de-mediating screen 18 in turn, and after being rinsed with water, the heavy medium is removed. The screened products of the second concentrate de-mediating screen 18 are medium ore products, which will enter the heavy medium medium ore re-crushing and re-selection system; the tailings discarding rate of this operation is 40%, and the tailings metal loss rate is 5.29%;

The medium ore products (grade of 0.91%) on the second concentrate screen 18 of the heavy medium second stage waste system enter the second fine crusher 20 and are crushed to -3 mm. The grading screen 5 separates the products into qualified particle sizes to continue the operation of the heavy medium first stage concentrate collection system and the heavy medium second stage waste system. The -0.5 mm fine particles under the grading screen 5 enter the fine particle size heavy medium sorting system.

In the third heavy medium mixing barrel 21, ferrosilicon powder (magnetic content ≥ 95%, fineness ‑325 mesh ≥ 90%) and water are mixed into a heavy medium suspension with a density of 2.30 g/m3, and mixed with the ‑0.5 mm fine-grained material under the grading screen 5 (fine-grained Li2O grade is 1.25%), and sent to the third two-product heavy medium cyclone 22 for sorting by a slurry pump to obtain a sand settling product and an overflow product. The sand settling products after sorting are successively passed through the concentrate concentrating magnetic separator 23 and the concentrate scavenging magnetic separator 24 to remove the heavy medium. The non-magnetic end outlet of the magnetic separator is a qualified fine-grained concentrate product with a grade of 5.00% and an operating concentrate yield of 15%, which can be sold directly. The overflow products after sorting are successively passed through the tailings concentrating magnetic separator 25 and the tailings scavenging magnetic separator 26 to remove the heavy medium. The non-magnetic end outlet of the magnetic separator is a qualified fine-grained tailings product with a grade of 0.59% and an operating yield of 85%, which enters the flotation system.

The fine-grained tailings after the fine-grained heavy medium separation are fed into the ball mill 27 for grinding, and the tailings are ground to ‑200 mesh, accounting for 75%;

The fine-grained material after grinding is adjusted to a pulp concentration of about 30%, and is fed into the flotation stirring barrel 28. The adjusting agent, the collecting agent, and the frother are added in sequence. After sufficient stirring, the material is fed into the flotation operation. After a flotation process of one roughing selection, two cleaning selections, and one scavenging selection, the final spodumene concentrate is obtained. Its indicators are shown in the following table.

Process concentrate Li2O grade concentrate recovery rate/% flotation 4.6780.40 heavy medium separation-flotation 5.3788.44

From the above comparison, it can be seen that compared with the simple flotation process and the heavy medium separation-flotation combined sorting system of the present application, the present application can directly sort out qualified concentrates for sale before entering the flotation system, and throw out a large amount of tailings, reducing the amount of dry ore entering flotation, thereby reducing the flotation cost and tailings treatment cost. At the same time, the grade and total recovery rate of the spodumene concentrate after heavy medium separation-flotation are significantly higher than the product grade and total recovery rate obtained by the simple flotation process.

The above is a detailed introduction to the specific implementation methods of the present application. For those skilled in the art, several improvements and modifications may be made to the present application without departing from the principles of the present application. These improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

A spodumene ore heavy medium sorting and flotation combined sorting system, characterized in that: the combined sorting system comprises a heavy medium sorting system and a flotation system, the heavy medium sorting system comprises a heavy medium first stage concentrate collection system, a heavy medium second stage waste disposal system, a heavy medium middling ore re-crushing and re-selection system and a fine-grained heavy medium sorting system; the heavy medium sorting system comprises a crusher, a grading screen (5), a heavy medium combining barrel, a two-product heavy medium cyclone, a fixed screen, a de-medium screen and a magnetic separator, the crusher The discharge port of the crusher is connected to the grading screen (5), and the grading screen (5) divides the spodumene crushed by the crusher into two particle size products, namely, qualified particle size and fine particle size. The qualified particle size is sorted by the heavy medium first-stage concentrate collection system, the heavy medium second-stage waste disposal system and the heavy medium middling re-crushing and re-selection system to obtain gravity separation concentrate and gravity separation tailings. The fine particle size is sorted by the fine particle size heavy medium sorting system and the flotation system to obtain fine particle size concentrate, flotation concentrate and flotation tailings.
A spodumene ore heavy medium sorting and flotation combined sorting system according to claim 1, characterized in that: the heavy medium first stage concentrate collection system includes a crusher, a grading screen (5), a first heavy medium combined medium barrel (6), a first two-product heavy medium cyclone (7), a first concentrate fixed screen (8), a first concentrate de-mediation screen (9), a first tailings fixed screen (10), a first tailings de-mediation screen (11) and a first magnetic separator (12); the qualified particle size discharge port of the grading screen (5) is connected to the feed port of the first heavy medium combined medium barrel (6) through a chute, and the discharge port of the first heavy medium combined medium barrel (6) is transported to the feed port end of the first two-product heavy medium cyclone (7) through a slurry pump; the overflow outlet and the underflow outlet of the first two-product heavy medium cyclone (7) are respectively connected to the first tailings fixed screen (10) and the first concentrate fixed screen (8) through pipelines, and the first The outlets of the above-screen products of the fixed tailings screen (10) and the first fixed concentrate screen (8) are respectively connected to the first tailings de-mediating screen (11) and the first concentrate de-mediating screen (9); the below-screen products of the first fixed tailings screen (10) and the first fixed concentrate screen (8) are respectively connected to the first heavy medium combining barrel (6) via pipelines, and the below-screen product outlets of the first tailings de-mediating screen (11) and the first concentrate de-mediating screen (9) are connected to the first magnetic separator (12); the outlet of the magnetic product of the first magnetic separator (12) is connected to the first heavy medium combining barrel (6) via a pipeline; the outlet of the non-magnetic product of the first magnetic separator (12) is transported to a return water tank via a pipeline; the above-screen product of the first concentrate de-mediating screen (9) is a re-selected concentrate, and the above-screen material of the first tailings de-mediating screen (11) is connected to the heavy medium second-stage discarding system via a belt.
According to claim 2, a spodumene ore heavy medium separation and flotation combined separation system is characterized in that: the heavy medium first stage collection system also includes an inspection screening machine (3), the crusher includes a coarse crusher (1), a medium crusher (2) and a first fine crusher (4), and the spodumene passes through the coarse crusher (1) and the medium crusher (2) in sequence and enters the inspection screening machine (3).
The spodumene ore heavy medium separation and flotation combined separation system according to claim 3 is characterized in that the above-screen product of the inspection screening machine (3) enters the first fine crushing crusher (4) for crushing again, and the below-screen product enters the grading screen (5).
A spodumene ore heavy medium sorting and flotation combined sorting system according to claim 2, characterized in that: the heavy medium two-stage discarding system includes a second heavy medium combined barrel (13), a second two-product heavy medium cyclone (14), a second tailings fixed screen (15), a second tailings de-medium screen (16), a second concentrate fixed screen (17), a second concentrate de-medium screen (18) and a second magnetic separator (19); the discharge port of the first tailings de-medium screen (11) is connected to the feed port of the second heavy medium combined barrel (13) through a chute, and the discharge port of the second heavy medium combined barrel (13) is transported to the feed port end of the second two-product heavy medium cyclone (14) through a slurry pump; the overflow outlet and the underflow outlet of the second two-product heavy medium cyclone (14) are respectively connected to the second tailings fixed screen (15) and the second concentrate fixed screen (17) through pipelines, and the second concentrate fixed screen (17) is connected to the second tailings fixed screen (15) and the second concentrate fixed screen (17) through pipelines. The on-screen product outlets of the screen (17) and the second tailings fixed screen (15) are respectively connected to the second concentrate de-mediation screen (18) and the second tailings de-mediation screen (16); the under-screen products of the second concentrate fixed screen (17) and the second tailings fixed screen (15) are respectively connected to the second heavy medium combination barrel (13) via pipelines, and the under-screen product outlets of the second concentrate de-mediation screen (18) and the second tailings de-mediation screen (16) are connected to the second magnetic separator (19); the magnetic product outlet of the second magnetic separator (19) is connected to the second heavy medium combination barrel (13) via a pipeline, and the non-magnetic product outlet of the second magnetic separator (19) is transported to the return water tank via a pipeline, the on-screen product of the second tailings de-mediation screen (16) is the gravity-selected tailings, and the on-screen material of the second concentrate de-mediation screen (18) is connected to the heavy medium middling ore re-crushing and re-selection system via a belt.
According to claim 5, a spodumene ore heavy medium separation and flotation combined separation system is characterized in that: the heavy medium ore re-crushing and re-separation system includes a second fine crusher (20), the discharge port of the second concentrate de-mediation screen (18) enters the second fine crusher (20) through a belt, and the discharge port of the second fine crusher (20) is connected to the grading screen (5).
A spodumene ore heavy medium sorting and flotation combined sorting system according to claim 1, characterized in that: the fine-grained heavy medium sorting system comprises a third heavy medium combining barrel (21), a third two-product heavy medium cyclone (22), a concentrate concentration magnetic separator (23), a concentrate scavenging magnetic separator (24), a tailings concentration magnetic separator (25) and a tailings scavenging magnetic separator (26); the fine-grained material discharge port of the grading screen (5) is connected to the feed port of the third heavy medium combining barrel (21) through a chute, and the discharge port of the third heavy medium combining barrel (21) is transported to the feed port end of the third two-product heavy medium cyclone (22) through a slurry pump; the overflow outlet and the underflow outlet of the third two-product heavy medium cyclone (22) are respectively connected to the The tailings concentrating magnetic separator (25) is connected to the concentrate concentrating magnetic separator (23), and the non-magnetic product outlets of the tailings concentrating magnetic separator (25) and the concentrate concentrating magnetic separator (23) are respectively connected to the tailings scavenging magnetic separator (26) and the concentrate scavenging magnetic separator (24); the magnetic product outlets of the concentrate concentrating magnetic separator (23), the concentrate scavenging magnetic separator (24), the tailings concentrating magnetic separator (25) and the tailings scavenging magnetic separator (26) are connected to the third heavy medium combining barrel (21) through a pipeline, the non-magnetic product outlet of the concentrate scavenging magnetic separator (24) is dehydrated to become a fine-grained concentrate, and the non-magnetic product outlet of the tailings scavenging magnetic separator (26) is dehydrated and connected to the flotation system.
A spodumene ore heavy medium separation and flotation combined separation system according to claim 7, characterized in that: the flotation system comprises a ball mill (27), a flotation stirring barrel (28) and a flotation unit, the non-magnetic product outlet of the tailings scavenging magnetic separator (26) is connected to the feed port of the ball mill (27) via a chute, the discharge port of the ball mill (27) is connected to the feed port of the flotation stirring barrel (28) via a pipeline, and the discharge port of the flotation stirring barrel (28) is connected to the feed port of the flotation unit via a pipeline; after separation by the flotation unit, the final foam product is a flotation concentrate, and the final in-tank product is a flotation tailings.
A spodumene ore heavy medium separation and flotation combined separation system according to claim 8, characterized in that: the flotation unit comprises a first flotation unit (29), a second flotation unit (30), a third flotation unit (31), a fourth flotation unit (32), a fifth flotation unit (33) and a sixth flotation unit (34); the discharge port of the flotation stirring barrel (28) is connected to the feed port of the first flotation unit (29) through a pipeline, the product outlet in the tank of the first flotation unit (29) is connected to the feed port of the second flotation unit (30) through a pipeline, and the second flotation unit (34) is connected to the feed port of the second flotation unit (31). The product in the tank of the first flotation unit (29) is connected to the feed port of the third flotation unit (31), and the product in the tank of the third flotation unit (31) is flotation tailings; the foam product outlet of the first flotation unit (29) is connected to the feed port of the fourth flotation unit (32) through a pipeline, the foam product outlet of the fourth flotation unit (32) is connected to the feed port of the fifth flotation unit (33) through a pipeline, the foam product outlet of the fifth flotation unit (33) is connected to the feed port of the sixth flotation unit (34) through a pipeline, and the foam product of the sixth flotation unit (34) is flotation concentrate.