CN111167595A

CN111167595A - Process method for improving qualified material granularity ratio by secondary classification of cyclone of concentrating mill

Info

Publication number: CN111167595A
Application number: CN201911392315.4A
Authority: CN
Inventors: 崔志祥; 邓作玉; 崔超超; 崔文昭; 曹鹏鹏
Original assignee: Dongying Lufang Metal Material Co ltd; Shandong Fangyuan Nonferrous Metals Science & Technology Co ltd; Dongying Fangyuan Non Ferrous Metals Co ltd
Current assignee: Dongying Lufang Metal Material Co ltd; Shandong Fangyuan Nonferrous Metals Science & Technology Co ltd; Dongying Fangyuan Non Ferrous Metals Co ltd
Priority date: 2019-12-30
Filing date: 2019-12-30
Publication date: 2020-05-19

Abstract

The invention provides a process method for improving the grain size ratio of qualified materials by secondary grading of a cyclone of a dressing plant, belonging to the field of colored ore dressing; the process comprises the following steps: the secondary classification operation is realized by utilizing the series connection of the secondary cyclones to improve the fineness of materials entering the secondary flotation, the overflow of the primary cyclone returns to a phi 2500 multiplied by 2500 stirring barrel, one side of the stirring barrel is pumped into the secondary cyclones through a sand pump for secondary classification, the overflow is sent to the secondary flotation operation, settled sand obtained by the secondary classification is returned to a secondary ball mill for regrinding, and finally the single body of the primary classification cyclone is determined to adopt phi 350 and a settled sand nozzle phi 60 through long-term experimental investigation, and the single body of the secondary classification cyclone adopts phi 250 and a settled sand nozzle phi 55; the granularity of the qualified material after secondary grading is obviously improved compared with that of primary grading, valuable copper metallization and gangue are fully and singly dissociated, copper content in tailings of flotation operation is greatly reduced, and the copper recovery rate is greatly improved.

Description

Process method for improving qualified material granularity ratio by secondary classification of cyclone of concentrating mill

Technical Field

The invention relates to the field of colored mineral separation, in particular to a process method for improving the grain size ratio of qualified materials by secondary grading of a cyclone of a concentrating mill.

Background

Along with the long-term exploitation of the copper mine resources in the world, the mineral resources are increasingly depleted, and the research on the comprehensive utilization of copper smelting slag is deeply carried out, so that the aim of 'eating dry pressing clean' is really realized, in order to further develop and utilize secondary resources to reduce the copper content in tailings, valuable metal copper elements and gangue can be dissociated in a monomer, the proportion of qualified granularity in the flotation is improved, and the cyclone plays an important role in the material granularity grading operation process as mineral separation grading equipment; in the operation of ore dressing, grinding and flotation, valuable metal elements and gangue cannot be separated in a monomer manner due to low grinding fineness, so that the problem of serious resource waste caused by loss of precious metals along with tailings is solved.

Disclosure of Invention

In order to solve the prior art problem, the invention provides a process method for improving the grain size ratio of qualified materials by secondary grading of a cyclone of a concentrating mill, which adopts the following technical scheme: the process method comprises the following steps: the secondary classification operation is realized by utilizing the series connection of the secondary cyclones to improve the fineness of the materials entering the secondary flotation, the overflow of the primary cyclone returns to a phi 2500 multiplied by 2500 stirring barrel, one side of the stirring barrel is pumped into the secondary cyclones through a sand pump for secondary classification, the overflow is sent to the secondary flotation operation, and the settled sand obtained by the secondary classification is returned to the secondary ball mill for regrinding; the single body of the primary grading cyclone adopts phi 350 and a sand setting nozzle phi 60, and the single body of the secondary grading cyclone adopts phi 250 and a sand setting nozzle phi 55;

further, the secondary grading operation is used as an independent individual, a manual gate valve is arranged at an inlet and an outlet, the gate valve can be opened and closed, secondary grading can be started when the grinding fineness is poor, and secondary grading can be closed when the grinding fineness is better.

The invention has the following beneficial effects:

(1) the granularity of the qualified material after secondary grading is obviously improved compared with that of primary grading, valuable copper metallization and gangue are fully and singly dissociated, copper content in tailings of flotation operation is greatly reduced, and the copper recovery rate is greatly improved;

(2) when the grinding fineness is poor, secondary grading can be started, and when the grinding fineness is better, secondary grading can be closed, so that energy is saved, consumption is reduced, cutting-in and cutting-out are flexible and easy, and the overhaul operation is convenient;

(3) the secondary classification of the secondary grinding cyclone plays an important role in improving the material classification granularity, can be popularized in the colored mineral separation industry, and has remarkable social benefit.

Drawings

FIG. 1 is a process flow diagram of the present invention;

FIG. 2 is a flow chart of the original process of the present invention.

Detailed Description

The embodiment of the process method for improving the ratio of the particle sizes of the qualified materials by secondary classification of the cyclone of the concentrating mill provided by the invention is described below with reference to the attached drawings.

The secondary classification operation is realized by utilizing the series connection of the secondary cyclones to improve the fineness of the materials entering the secondary flotation, the overflow of the primary cyclone returns to a phi 2500 multiplied by 2500 stirring barrel, one side of the stirring barrel is pumped into the secondary cyclones through a sand pump for secondary classification, the overflow is sent to the secondary flotation operation, and the settled sand obtained by the secondary classification is returned to the secondary ball mill for regrinding; the single body of the primary grading cyclone adopts phi 350 and a sand setting nozzle phi 60, and the single body of the secondary grading cyclone adopts phi 250 and a sand setting nozzle phi 55;

Example 1:

before the secondary classification of the second-stage ball milling without adopting a cyclone, the fineness of the cyclone entering the second-stage flotation is-325 meshes 80%, and the average copper content of tailings is 0.28%.

Example 2:

after the secondary classification of the cyclone, the fineness of minus 325 meshes of secondary flotation after the secondary classification of the cyclone is improved to 85 percent, the average content of copper in tailings is 0.25 percent, the direct economic benefit is about 1000 ten thousand yuan and the economic benefit is obvious according to the calculation of the treatment capacity of 100 ten thousand tons of slag every year.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.

Claims

1. A process method for improving the grain size ratio of qualified materials by secondary grading of a cyclone of a concentrating mill is characterized by comprising the following steps: the process comprises the following steps: the secondary classification operation is realized by utilizing the series connection of the secondary cyclones to improve the fineness of the materials entering the secondary flotation, the overflow of the primary cyclone returns to a phi 2500 multiplied by 2500 stirring barrel, one side of the stirring barrel is pumped into the secondary cyclones through a sand pump for secondary classification, the overflow is sent to the secondary flotation operation, and the settled sand obtained by the secondary classification is returned to the secondary ball mill for regrinding; the single body of the primary grading cyclone adopts phi 350 and a sand settling nozzle phi 60, and the single body of the secondary grading cyclone adopts phi 250 and a sand settling nozzle phi 55.

2. The process method for improving the grain size ratio of qualified materials by secondary classification of the cyclone of the concentrating mill according to claim 1, which is characterized in that: the secondary grading operation is used as an independent individual, a manual gate valve is arranged at an inlet and an outlet, the gate valve can be opened and closed, secondary grading can be started when the grinding fineness is poor, and secondary grading can be closed when the grinding fineness is better.