CN113976306A - Pre-waste-throwing system and process for complex refractory low-grade molybdenum ore heavy-medium beneficiation - Google Patents
Pre-waste-throwing system and process for complex refractory low-grade molybdenum ore heavy-medium beneficiation Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 36
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 title claims abstract description 25
- 229910052750 molybdenum Inorganic materials 0.000 title claims abstract description 25
- 239000011733 molybdenum Substances 0.000 title claims abstract description 25
- 239000012141 concentrate Substances 0.000 claims abstract description 132
- 239000006148 magnetic separator Substances 0.000 claims abstract description 97
- 238000000926 separation method Methods 0.000 claims abstract description 35
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 18
- 238000007885 magnetic separation Methods 0.000 claims description 23
- 239000002245 particle Substances 0.000 claims description 10
- 238000010494 dissociation reaction Methods 0.000 claims description 7
- 230000005593 dissociations Effects 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 7
- 239000000178 monomer Substances 0.000 claims description 7
- 238000004064 recycling Methods 0.000 claims description 5
- 239000002002 slurry Substances 0.000 claims description 5
- 239000010419 fine particle Substances 0.000 claims description 4
- JTJMJGYZQZDUJJ-UHFFFAOYSA-N phencyclidine Chemical class C1CCCCN1C1(C=2C=CC=CC=2)CCCCC1 JTJMJGYZQZDUJJ-UHFFFAOYSA-N 0.000 claims description 3
- 230000008901 benefit Effects 0.000 abstract description 7
- 229910052500 inorganic mineral Inorganic materials 0.000 abstract description 5
- 239000011707 mineral Substances 0.000 abstract description 5
- 238000011084 recovery Methods 0.000 description 7
- 239000002699 waste material Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000005484 gravity Effects 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- CWQXQMHSOZUFJS-UHFFFAOYSA-N molybdenum disulfide Chemical compound S=[Mo]=S CWQXQMHSOZUFJS-UHFFFAOYSA-N 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005188 flotation Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052961 molybdenite Inorganic materials 0.000 description 1
- 238000011160 research Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B7/00—Combinations of wet processes or apparatus with other processes or apparatus, e.g. for dressing ores or garbage
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B9/00—General arrangement of separating plant, e.g. flow sheets
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Abstract
The invention relates to the technical field of molybdenum ore dressing, in particular to a complex and refractory low-grade molybdenum ore dense-medium mineral separation pre-waste-throwing system and a waste-throwing process, which are characterized by comprising a ball mill, a mixing barrel, a dense-medium cyclone, a magnetic separator, a concentration cyclone, a classification cyclone, a magnetic separator and a dewatering screen, wherein raw ore is fed into the ball mill for crushing, crushed ore is uniformly mixed with dense medium in the mixing barrel and then fed into the dense-medium cyclone for separation, separated concentrate and tailings are respectively fed into the magnetic separator for medium removal operation, magnetically separated concentrate tailings are respectively fed into the concentration cyclone for dewatering concentration, concentrated concentrate is fed into the classification cyclone, underflow is returned to the ball mill for regrinding, overflow of the classification cyclone is fed into subsequent separation operation, and the dewatered tailings are final tailings products and can be used as gravel aggregate for resource utilization, the method has the advantages of simple system, high separation index, high effective treatment capacity, reduced water consumption, reduced operation cost and the like.
Description
Technical Field
The invention relates to the technical field of molybdenum ore dressing, in particular to a complex refractory low-grade molybdenum ore heavy-medium ore dressing pre-waste-throwing system and a waste-throwing process, which have the advantages of simple system, high separation index, high effective treatment amount, water consumption reduction and running cost reduction.
Background
As is known, molybdenum is a metal element, mainly extracted from molybdenum ore, and has the advantages of high strength, high melting point, corrosion resistance, grinding resistance and the like, and is widely used in industry. However, with the continuous exploitation of molybdenum ore resources, the ore selectivity is gradually deteriorated, the grade is low, the ore size is fine, the tailing components are complex, and even the ore grade of some mines reaches the lower limit of the exploitation grade. The useful minerals in the molybdenum ore are mainly Molybdenite (MOS) by analysis2) Specific gravity of 4.7-4.8g/cm3The gangue is mainly silicate carbonate, and the specific gravity is generally 3.0g/cm3The following. The existing useful minerals and gangue minerals have obvious specific gravity difference, the theoretical analysis has certain feasibility of pre-discarding the ores by adopting a heavy-medium ore dressing technology, and a certain amount of tailings are thrown out in advance, so that the treatment capacity of subsequent operation is reduced, and the grade of the selected ores is improved.
However, the low-grade molybdenum ore is treated by the existing heavy-medium ore separation process, and researches show that the separation index is poor. The first reason is as follows: the existing heavy-medium separation process mainly comprises the steps of treating ores before grinding, wherein the ore is coarse in selected particle size, poor in degree of dissociation of ore monomers, low in yield and high in grade of thrown tailings, and the metal recovery rate is low. The second reason is that: the existing heavy-medium separation technology has a certain lower limit of the selected particle size, the ore below 0.5mm can not be separated generally, if the separation index is improved by adopting a method of reducing the selected particle size of the ore and improving the monomer dissociation degree of the ore, the yield of-0.5 mm particle size fraction is obviously increased, the actual selected amount (+ 0.5 mm) is greatly reduced, and the results of high operation waste throwing rate and low comprehensive waste throwing rate are generated.
According to the analysis, the molybdenum ore resources in China have gradually lower selection grade, and the existing heavy-medium mineral selection process has poor separation effect. In order to improve the flotation grade of molybdenum ore and obtain qualified molybdenum concentrate, a heavy-medium beneficiation process with simple process and better separation effect is needed to be developed.
Disclosure of Invention
The invention aims to solve the defects of the prior art and provide a complex refractory low-grade molybdenum ore heavy-medium ore dressing pre-waste-throwing system and a waste-throwing process, which have the advantages of simple system, high sorting index, high effective treatment amount, reduced water consumption and reduced operation cost.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a complex refractory low-grade molybdenum ore heavy-medium separation ore pre-waste-throwing system is characterized by comprising a ball mill, a mixing barrel, a heavy medium cyclone, a first-stage concentrate magnetic separator, a second-stage concentrate magnetic separator, a concentrate concentration cyclone, a grading cyclone, a first-stage tailing magnetic separator, a second-stage tailing magnetic separator, a tailing concentration cyclone and a dewatering screen, wherein a discharge port of the ball mill is communicated with a feed port of the mixing barrel, a discharge port of the mixing barrel is communicated with a feed port of the heavy medium cyclone, an overflow port of the heavy medium cyclone is communicated with a feed port of the first-stage concentrate magnetic separator, a magnetic concentrate outlet of the first-stage concentrate magnetic separator is communicated with a feed port of the mixing barrel, a magnetic concentrate outlet of the first-stage concentrate magnetic separator is communicated with a feed port of the second-stage concentrate magnetic separator, a concentrate outlet of the second-stage concentrate magnetic separator is communicated with a feed port of the mixing barrel, the tailing outlet of the concentrate two-stage magnetic separator is communicated with the feed inlet of a concentrate concentrating cyclone, circulating water flows out of an overflow port of the concentrate concentrating cyclone and is recycled, a bottom flow port of the concentrate concentrating cyclone is communicated with the feed inlet of a grading cyclone, a bottom flow port of the grading cyclone is communicated with the feed inlet of a ball mill, the overflow of the grading cyclone is fed into subsequent grading operation, a bottom flow port of a heavy medium cyclone is communicated with the feed inlet of the tailing one-stage magnetic separator, a magnetic concentrate outlet of the tailing one-stage magnetic separator is communicated with the feed inlet of a mixing barrel, a magnetic tailings outlet of the tailing one-stage magnetic separator is communicated with the feed inlet of the tailing two-stage magnetic separator, a magnetic concentrate outlet of the tailing two-stage magnetic separator is communicated with the feed inlet of the mixing barrel, and a magnetic tailings outlet of the tailing concentrating cyclone is communicated with the feed inlet of the tailing concentrating cyclone, the overflow port of the tailing concentrating cyclone is used for circulating water, the underflow port of the tailing concentrating cyclone is communicated with the feed inlet of the dewatering screen, the undersize product outlet of the dewatering screen is communicated with the feed inlet of the tailing concentrating cyclone, and the oversize product outlet of the dewatering screen is used as tailing product.
A complex refractory low-grade molybdenum ore heavy-medium beneficiation pre-waste-throwing process is characterized by comprising the following steps: the method comprises the steps of feeding raw ores into a first-stage ball mill for crushing, uniformly mixing the crushed ores with heavy media in a mixing barrel, feeding the mixture into a heavy media cyclone for separation, feeding the separated concentrate into a first-stage concentrate magnetic separator for magnetic separation, feeding the magnetic concentrate of the first-stage concentrate magnetic separator into the mixing barrel, feeding the magnetic tailings of the first-stage concentrate magnetic separator into a second-stage concentrate magnetic separator for magnetic separation, feeding the magnetic concentrate of the second-stage concentrate magnetic separator into the mixing barrel, feeding the magnetic tailings of the second-stage concentrate magnetic separator into a concentrate concentration cyclone, circulating water flowing out of an overflow port of the concentrate concentration cyclone for recycling, feeding underflow products of the concentrate concentration cyclone into a classification cyclone for separation, feeding overflow products of the classification cyclone into subsequent separation operation, feeding the underflow products of the classification cyclone into a ball mill for grinding again, and feeding the tailings separated by the heavy media cyclone into the first-stage tailing for magnetic separation, the magnetic separation concentrate of the first-stage tailing magnetic separator enters a mixing barrel, the magnetic separation tailings of the first-stage tailing magnetic separator enter a second-stage tailing magnetic separator for magnetic separation, the magnetic separation concentrate of the second-stage tailing magnetic separator enters the mixing barrel, the magnetic separation tailings of the second-stage tailing magnetic separator enter a tailing concentration cyclone, circulating water flowing out of an overflow port of the tailing concentration cyclone is recycled, a underflow port of the tailing concentration cyclone enters a dewatering screen, undersize products of the dewatering screen enter the tailing concentration cyclone for secondary separation, oversize products of the dewatering screen are tailing products, and the tailings are recycled as gravel aggregates.
The raw ore is a finely crushed product, the maximum particle size is 20mm, the grade is 0.03-0.07%, the ore can be distributed with fine particle size, and the monomer dissociation degree is poor.
The maximum granularity of the ore crushed by the ball mill is 5-8mm, and the mass concentration is about 65-70%.
After the ores crushed by the ball mill are fully and uniformly mixed with the dense medium in the mixing barrel, a slurry pump is needed to be used for feeding the ores into the dense medium cyclone at a certain pressure, and the pressure value is 0.15-0.25 MPa.
The heavy medium cyclone has the separation density of 2.0-3.5g/cm3。
The yield of the concentrate after the heavy medium cyclone is used for separation is more than 40%, the grade is 0.06% -0.12%, the yield of the tailings is less than 60%, and the grade is 0.01% -0.02%.
The magnetic field intensity of the concentrate first-stage magnetic separator, the concentrate second-stage magnetic separator, the tailing first-stage magnetic separator and the tailing second-stage magnetic separator is 3000GS, the mass concentration of a feeding medium is 20-30%, the medium concentration of magnetic concentrate is over 75%, and the mass concentration of concentrate and tailing after magnetic separation is 20-25%.
The mass concentration of the concentrated material of the concentration cyclone provided by the invention reaches more than 50%.
The overflow content of the grading cyclone is more than 60 percent when the overflow value is-0.075 mm, and the content of the underflow value is less than 15 percent when the underflow value is-0.075 mm.
The screen hole of the dewatering screen is 0.3mm, and the water content of the fine-fraction ore material on the screen is 16-20%.
The concentrate concentrating cyclone and the tailing concentrating cyclone are specially-made concentrating cyclones, the diameter of a middle column section of a cylinder of the concentrating cyclone is D, the height of the middle column section of the cylinder of the concentrating cyclone is 2D, the cone sections are sequentially divided into a first cone section, a second cone section and a third cone section from top to bottom, the cone angles of the first cone section, the second cone section and the third cone section are sequentially 70 degrees, 30 degrees and 10 degrees, and the diameter of a lower opening of the third cone section at the lowest end is 0.2 times of the diameter of the column section of the concentrating cyclone.
Compared with the existing heavy-medium ore dressing process flow, the process flow of the invention has the following advantages:
1. the heavy-medium ore dressing waste-throwing-in-advance process adopts the flow design of grinding before dressing, and after the ore is crushed by the ball mill, the ore has finer granularity of selection, better monomer dissociation degree and better sorting precision and sorting index. Particularly, the separation index of the ore with low grade and fine particle size is greatly improved.
2. In the process, all ores to be selected enter the dense medium cyclone for sorting, and the ores with the diameter of-0.5 mm are screened out without using a grading sieve, so that under the condition that the amount of the ores to be processed is the same, the effective treatment amount of the process flow is larger, the operation waste throwing rate is the comprehensive waste throwing rate, and the thrown tailing amount is larger.
3. In the process, in the aspect of medium recovery, an arc screen and a dewatering screen are not needed, the water consumption is greatly reduced, and meanwhile, the occupied area and the equipment operation cost are also reduced.
4. The cyclone concentrating device adopts a specially-made concentrating cyclone and a small cone angle structure, and is sequentially connected by three cones with different cone angles, the cone angle of the cone section of the cyclone cylinder body is reduced, so that the flow velocity of an internal flow field can be improved, the effective separation time can be prolonged by increasing the length of the cone, and the concentrating effect of the cyclone is better.
Drawings
FIG. 1 is a system flow diagram of the present invention.
FIG. 2 is a system flow diagram of a prior art process in an embodiment of the invention.
FIG. 3 is a schematic structural diagram of a barrel of a special concentrating cyclone in the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings:
as shown in the attached drawing, the complex refractory low-grade molybdenum ore heavy-medium beneficiation pre-waste-throwing system is characterized by comprising a ball mill 1, a mixing barrel 2, a heavy medium cyclone 3, a concentrate first-stage magnetic separator 4, a concentrate second-stage magnetic separator 5, a concentrate concentrating cyclone 6, a grading cyclone 7, a tailing first-stage magnetic separator 8, a tailing second-stage magnetic separator 9, a tailing concentrating cyclone 10 and a dewatering screen 11, wherein a discharge port of the ball mill 1 is communicated with a feed port of the mixing barrel 2, a discharge port of the mixing barrel 2 is communicated with a feed port of the heavy medium cyclone 3, an overflow port of the heavy medium cyclone 3 is communicated with a feed port of the concentrate first-stage magnetic separator 4, a magnetic concentrate outlet of the concentrate first-stage magnetic separator 4 is communicated with a feed port of the mixing barrel 2, a magnetic tailings outlet of the concentrate first-stage magnetic separator 4 is communicated with a feed port of the concentrate second-stage magnetic separator 5, the concentrate outlet of the concentrate second-stage magnetic separator 5 is communicated with the feed inlet of the mixing barrel 2, the tailing outlet of the concentrate second-stage magnetic separator 5 is communicated with the feed inlet of a concentrate concentrating cyclone 6, circulating water flows out of an overflow port of the concentrate concentrating cyclone 6 to be recycled, a bottom flow port of the concentrate concentrating cyclone 6 is communicated with the feed inlet of a grading cyclone 7, a bottom flow port of the grading cyclone 7 is communicated with the feed inlet of a ball mill 1, the overflow of the grading cyclone 7 is fed into the subsequent grading operation, a bottom flow port of the dense medium cyclone 3 is communicated with the feed inlet of a tailing first-stage magnetic separator 8, a magnetic concentrate outlet of the tailing first-stage magnetic separator 8 is communicated with the feed inlet of the mixing barrel 2, a magnetic tailing outlet of the tailing first-stage magnetic separator 8 is communicated with the feed inlet of a tailing second-stage magnetic separator 9, and a magnetic concentrate outlet of the tailing second-stage magnetic separator 9 is communicated with the feed inlet of the mixing barrel 2, the magnetic separation tailing outlet of the tailing second-stage magnetic separator 9 is communicated with a feeding hole of a tailing concentration cyclone 10, the overflow hole of the tailing concentration cyclone 10 flows out to be recycled by circulating water, a bottom flow port of the tailing concentration cyclone 10 is communicated with a feeding hole of a dewatering screen 11, an oversize product outlet of the dewatering screen 11 is communicated with the feeding hole of the tailing concentration cyclone 10, a product of an undersize product outlet of the dewatering screen 11 is a tailing product, and the waste throwing process comprises the following steps: the method comprises the steps of feeding raw ore into a first-stage ball mill 1 for crushing, uniformly mixing the crushed ore with heavy media in a mixing barrel 2, feeding the mixed ore into a heavy media cyclone 3 for sorting, feeding the sorted concentrate into a first-stage concentrate magnetic separator 4 for magnetic separation, feeding the magnetic concentrate of the first-stage concentrate magnetic separator 4 into the mixing barrel 2, feeding the magnetic tailings of the first-stage concentrate magnetic separator 4 into a second-stage concentrate magnetic separator 5 for magnetic separation, feeding the magnetic concentrate of the second-stage concentrate magnetic separator 5 into the mixing barrel 2, feeding the magnetic tailings of the second-stage concentrate magnetic separator 5 into a concentrate concentration cyclone 6, circulating water flowing out of an overflow port of the concentrate concentration cyclone 6 for recycling, feeding the bottom flow product of the concentrate concentration cyclone 6 into a classification cyclone 7 for sorting, feeding the overflow product of the classification cyclone 7 into subsequent sorting operation, feeding the bottom flow product of the classification cyclone 7 into the ball mill 1 for grinding again, the tailings separated by the heavy medium cyclone 3 enter a first-stage tailing magnetic separator 8 for magnetic separation, magnetic concentrate of the first-stage tailing magnetic separator 8 enters a mixing barrel 2, magnetic tailings of the first-stage tailing magnetic separator 8 enter a second-stage tailing magnetic separator 9 for magnetic separation, magnetic concentrate of the second-stage tailing magnetic separator 9 enters the mixing barrel 2, magnetic tailings of the second-stage tailing magnetic separator 9 enter a tailing concentration cyclone 10, circulating water flows out of an overflow port of the tailing concentration cyclone 10 for recycling, a bottom flow port of the tailing concentration cyclone 10 enters a dewatering screen 11, undersize products of the dewatering screen 11 enter the tailing concentration cyclone 10 for secondary separation, oversize products of the dewatering screen 11 are tailing products, and the undersize products are recycled as gravel aggregates.
Furthermore, the raw ore is a finely-crushed product, the maximum particle size is 20mm, the grade is 0.03-0.07%, the ore can be distributed with fine particle size, and the monomer dissociation degree is poor.
Furthermore, the maximum particle size of the ore crushed by the ball mill 1 is 5-8mm, and the mass concentration is about 65-70%.
Further, after the ore crushed by the ball mill 1 is fully and uniformly mixed with the dense medium in the mixing barrel 2, a slurry pump is needed to be used for feeding the ore into the dense medium cyclone 3 at a certain pressure, and the pressure value is 0.15-0.25 MPa.
Furthermore, the separation density of the dense medium cyclone 3 is 2.0-3.5g/cm3。
Further, the yield of the concentrate after the separation by the heavy medium cyclone 3 is more than 40%, the grade is 0.06% -0.12%, the yield of the tailings is less than 60%, and the grade is 0.01% -0.02%.
Further, the magnetic field intensity of the concentrate first-stage magnetic separator 4, the concentrate second-stage magnetic separator 5, the tailing first-stage magnetic separator 8 and the tailing second-stage magnetic separator 9 is 3000GS, the mass concentration of ore feeding media is 20% -30%, the medium concentration of magnetic concentrate is over 75%, and the mass concentration of concentrate and tailings after magnetic separation is 20% -25%.
Furthermore, the mass concentration of the material after the concentration of the concentration cyclone reaches more than 50 percent.
Furthermore, the content of the overflow of the classifying cyclone 7 is more than 60 percent when the overflow is-0.075 mm, and the content of the underflow is less than 15 percent when the underflow is-0.075 mm.
Furthermore, the mesh of the dewatering screen 11 is 0.3mm, and the water content of the fine-fraction ore material on the screen is 16-20%.
Further, the concentrate concentration cyclone and the tailing concentration cyclone are specially-made concentration cyclones, the diameter of a column section 12 in a cylinder of the concentration cyclone is D, the height of the concentration cyclone is 2D, the cone sections are sequentially divided into a first cone section 13, a second cone section 14 and a third cone section 15 from top to bottom, the cone angles of the first cone section 13, the second cone section 14 and the third cone section 15 are sequentially 70 degrees, 30 degrees and 10 degrees, the diameter of a lower opening of the third cone section 15 at the lowest end is 0.2 times of the diameter of the cyclone column section 12, the cone angle of the cone section is reduced, the flow velocity of an internal flow field can be improved, the effective separation time of the cyclone can be prolonged due to the increase of the length of the cone, and the concentration effect is better.
Examples
The system carries out complex refractory low-grade molybdenum ore heavy-medium beneficiation and waste throwing in advance: the molybdenum ore raw ore is a finely-crushed product, the maximum granularity is 13mm, the grade is 0.06%, the ore can be distributed with fine granularity, the monomer dissociation degree is poor, the maximum granularity of the ore crushed by the ball mill 1 is 5mm, the mass concentration is about 65%, the ore crushed by the ball mill 1 is fully and uniformly mixed with a dense medium in the mixing barrel 2 and then needs to be fed into the dense medium cyclone 3 by using a slurry pump at a certain pressure, the pressure value is 0.15MPa, and the separation density of the dense medium cyclone 3 is 2.9g/cm3The concentrate yield after the separation by the heavy medium cyclone 3 is 51.72%, the grade is 0.102%, the tailing yield is 48.28%, the grade is 0.015%, and the concentrate recovery rate is 87.93%, the magnetic field intensity of a two-stage magnetic separator in the medium recovery system is 3000GS, the ore feeding mass concentration is 23%, the recovered medium concentration is 78%, the mass concentration of the concentrate and the tailings after the magnetic separation is about 20%, and the mass concentration of the concentrate and the tailings after the magnetic separation is about 20%After magnetic separation, the concentrate and tailings are concentrated by a concentration cyclone, the mass concentration reaches 55%, the overflow content of a classification cyclone 7 of the concentrate is 68% in an overflow-0.075 mm content, the underflow content of the concentrate is 12% in an underflow-0.075 mm content, a dewatering screen 11 is 0.3mm in a screen hole, and the moisture content of fine-fraction ore materials on the screen is 18%.
The heavy-medium ore dressing process adopts the design of grinding-first and dressing-second flow, so that 48.28% of tailings are finally thrown, the grade of the tailings is 0.015%, the grade of the concentrate is 0.102%, and the grade of the concentrate is improved by 70% compared with that of 0.06% of the original ore before dressing. The economic benefit of the whole project is greatly improved.
The prior heavy-medium ore dressing waste-throwing process comprises the following specific steps: raw ore is sieved out by a grading sieve, ore with the diameter of-0.5 mm is uniformly mixed with dense medium in a mixing barrel 2 and then fed into a dense medium cyclone 3 for separation, the separated concentrate and tailings respectively enter respective medium recovery systems for medium removal, the removed medium returns to the mixing barrel 2 for recycling, the concentrate after medium removal and the ore with the diameter of-0.5 mm are fed into an ore grinding and grading system, and the tailings after medium removal are final tailings thrown out in advance.
The raw ore in the prior waste throwing process is a finely crushed product, the maximum granularity is 13mm, the grade is 0.06 percent, the raw ore is sieved by a classifying screen to minus 0.5mm, the grain fraction yield of minus 0.5mm is 28.05 percent, the grade is 0.091 percent, the yield of 0.5 to 13mm on the screen is 71.95 percent, the grade is 0.048 percent, the ore is uniformly mixed with a heavy medium in a mixing barrel 2 and then fed into a heavy medium cyclone 3 by a slurry pump at a certain pressure, the pressure value is 0.15MPa, and the sorting density of the heavy medium cyclone 3 is 2.9g/cm3The yield of the concentrate after the separation by the dense medium cyclone 3 is 61.29%, the grade is 0.06%, the yield of the tailings is 38.71%, the grade is 0.029%, and the recovery rate of the concentrate is 76.61%.
TABLE 1 comparison table of indexes of molybdenum ore in heavy-medium separation process and heavy-medium separation process of the present invention
As can be seen from the above table: compared with the existing heavy-medium beneficiation and waste-discarding pre-discarding process, the complex refractory low-grade molybdenum ore heavy-medium beneficiation and waste-discarding pre-discarding system and waste-discarding process have the advantages of being increased in tailing yield, reduced in concentrate yield, reduced in tailing grade, increased in concentrate grade, greatly improved in comprehensive waste-discarding rate, fine in selected particle size, low in tailing grade, high in concentrate metal recovery rate, high in comprehensive waste-discarding rate and the like.
Claims (10)
1. A complex refractory low-grade molybdenum ore heavy-medium separation ore pre-waste-throwing system is characterized by comprising a ball mill, a mixing barrel, a heavy medium cyclone, a first-stage concentrate magnetic separator, a second-stage concentrate magnetic separator, a concentrate concentration cyclone, a grading cyclone, a first-stage tailing magnetic separator, a second-stage tailing magnetic separator, a tailing concentration cyclone and a dewatering screen, wherein a discharge port of the ball mill is communicated with a feed port of the mixing barrel, a discharge port of the mixing barrel is communicated with a feed port of the heavy medium cyclone, an overflow port of the heavy medium cyclone is communicated with a feed port of the first-stage concentrate magnetic separator, a magnetic concentrate outlet of the first-stage concentrate magnetic separator is communicated with a feed port of the mixing barrel, a magnetic concentrate outlet of the first-stage concentrate magnetic separator is communicated with a feed port of the second-stage concentrate magnetic separator, a concentrate outlet of the second-stage concentrate magnetic separator is communicated with a feed port of the mixing barrel, the tailing outlet of the concentrate two-stage magnetic separator is communicated with the feed inlet of a concentrate concentrating cyclone, circulating water flows out of an overflow port of the concentrate concentrating cyclone and is recycled, a bottom flow port of the concentrate concentrating cyclone is communicated with the feed inlet of a grading cyclone, a bottom flow port of the grading cyclone is communicated with the feed inlet of a ball mill, the overflow of the grading cyclone is fed into subsequent grading operation, a bottom flow port of a heavy medium cyclone is communicated with the feed inlet of the tailing one-stage magnetic separator, a magnetic concentrate outlet of the tailing one-stage magnetic separator is communicated with the feed inlet of a mixing barrel, a magnetic tailings outlet of the tailing one-stage magnetic separator is communicated with the feed inlet of the tailing two-stage magnetic separator, a magnetic concentrate outlet of the tailing two-stage magnetic separator is communicated with the feed inlet of the mixing barrel, and a magnetic tailings outlet of the tailing concentrating cyclone is communicated with the feed inlet of the tailing concentrating cyclone, the overflow port of the tailing concentrating cyclone is used for circulating water, the underflow port of the tailing concentrating cyclone is communicated with the feed inlet of the dewatering screen, the undersize product outlet of the dewatering screen is communicated with the feed inlet of the tailing concentrating cyclone, and the oversize product outlet of the dewatering screen is used as tailing product.
2. A complex refractory low-grade molybdenum ore heavy-medium beneficiation pre-waste-throwing process is characterized by comprising the following steps: the method comprises the steps of feeding raw ore into a first-stage ball mill for crushing, wherein the raw ore is a finely crushed product, the maximum particle size is 20mm, the grade is 0.03-0.07%, the ore can be distributed with fine particle size, the monomer dissociation degree is poor, the crushed ore is uniformly mixed with a heavy medium in a mixing barrel and then fed into a heavy medium cyclone for sorting, the sorted concentrate enters a concentrate first-stage magnetic separator for magnetic separation, the magnetic concentrate of the concentrate first-stage magnetic separator enters a mixing barrel, the magnetic tailings of the concentrate first-stage magnetic separator enter a concentrate second-stage magnetic separator for magnetic separation, the magnetic concentrate of the concentrate second-stage magnetic separator enters the mixing barrel, the magnetic tailings of the concentrate second-stage magnetic separator enter a concentrate concentration cyclone, circulating water flows out of an overflow port of the concentrate concentration cyclone for recycling, the underflow product of the concentrate concentration cyclone enters a grading cyclone for sorting, and the overflow product of the grading cyclone is fed into subsequent sorting operation, the bottom stream outlet product of the grading cyclone enters a ball mill for grinding again, the tailings separated by the dense medium cyclone enter a first-stage tailing magnetic separator for magnetic separation, the magnetic concentrate of the first-stage tailing magnetic separator enters a mixing barrel, the magnetic concentrate of the first-stage tailing magnetic separator enters a second-stage tailing magnetic separator for magnetic separation, the magnetic concentrate of the second-stage tailing magnetic separator enters the mixing barrel, the magnetic concentrate of the second-stage tailing magnetic separator enters a tailing concentration cyclone, circulating water flowing out of an overflow port of the tailing concentration cyclone is recycled, the bottom stream outlet of the tailing concentration cyclone enters a dewatering screen, the undersize product of the dewatering screen enters the tailing concentration cyclone for secondary separation, the oversize product of the dewatering screen is a tailing product, and the tailings is recycled as gravel aggregate.
3. The process of claim 2, wherein the ball mill is used to pulverize a heavy-medium ore dressing with a maximum particle size of 5-8mm and a mass concentration of about 65-70%.
4. The process of claim 2, wherein the ore crushed by the ball mill is fully mixed with dense media in a mixing barrel, and then fed into a dense media cyclone by a slurry pump at a certain pressure, wherein the pressure value is 0.15-0.25 MPa.
5. The process of claim 2, wherein the dense medium cyclone has a separation density of 2.0-3.5g/cm3。
6. The process of claim 2, wherein the yield of the concentrate after separation by the dense medium cyclone is more than 40%, the grade is 0.06% -0.12%, the tailing yield is less than 60%, and the grade is 0.01% -0.02%.
7. The process of claim 2, wherein the magnetic field strength of the concentrate first-stage magnetic separator, the concentrate second-stage magnetic separator, the tailing first-stage magnetic separator and the tailing second-stage magnetic separator is 3000GS, the mass concentration of ore feeding media is 20% -30%, the medium concentration of magnetic concentrate is over 75%, and the mass concentration of concentrate and tailings after magnetic separation is 20% -25%.
8. The heavy-medium beneficiation and pre-dumping process for the complex and refractory low-grade molybdenum ore according to claim 2, wherein the mass concentration of the concentrated material of the concentration cyclone reaches more than 50%.
9. The process of claim 2, wherein the classifying cyclone has an overflow content of 60% or more at-0.075 mm and an underflow content of 15% or less at-0.075 mm, the dewatering screen has a screen aperture of 0.3mm, and the moisture content of the fine fraction ore material on the screen is 16-20%.
10. The process of claim 2, wherein the concentrate concentrating cyclone and the tailing concentrating cyclone are specially-made concentrating cyclones, the diameter of a column section in a cylinder of the concentrating cyclone is D, the height of the column section is 2D, the cone sections are sequentially divided into a first cone section, a second cone section and a third cone section from top to bottom, the cone angles of the first cone section, the second cone section and the third cone section are sequentially 70 degrees, 30 degrees and 10 degrees, and the diameter of a lower opening of the third cone section at the lowest end is 0.2 times of the diameter of the column section of the cyclone.
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| CN115121365A (en) * | 2022-07-01 | 2022-09-30 | 阿巴嘎旗金地矿业有限责任公司 | Intelligent molybdenum ore sorting and pre-throwing process |
| CN115254398A (en) * | 2022-09-01 | 2022-11-01 | 山东黄金矿业科技有限公司选冶实验室分公司 | Method for pre-selecting and discarding gold ores and reducing excessive grinding |
| CN116943856A (en) * | 2023-09-20 | 2023-10-27 | 矿冶科技集团有限公司 | Method for effectively recovering chromite |
| CN118002290A (en) * | 2024-04-10 | 2024-05-10 | 湖南有色新田岭钨业有限公司 | Scheelite preselection waste disposal process |
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| CN115254398B (en) * | 2022-09-01 | 2024-06-07 | 山东黄金矿业科技有限公司选冶实验室分公司 | Method for pre-dressing waste disposal and overgrinding reduction of gold ore |
| CN116943856A (en) * | 2023-09-20 | 2023-10-27 | 矿冶科技集团有限公司 | Method for effectively recovering chromite |
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