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Beneficiation method for recovering pyrites from coal gangue

A mineral processing method and coal gangue technology, applied in chemical instruments and methods, wet separation, solid separation, etc., can solve the problems of poor flotation selectivity, complexity, pyrite loss, etc., to improve the recovery rate, increase Effect of added value and cost reduction

Active Publication Date: 2016-06-15
唐山联众选煤科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] With the advancement of science and technology, the emergence of new agents, new processes, and equipment, breakthroughs have been made in the extraction and utilization of pyrite in coal gangue. The typical methods for extracting pyrite in coal gangue are mainly gravity separation or In flotation, the prominent problem of the former is that the recovery rate of ore dressing is low, and a large amount of pyrite is lost in the tailings; the problems caused by the latter mainly include: ① The crushed ore is directly ground, resulting in high cost of the dressing plant; ②In the flotation process, the extraction of pyrite requires complex chemicals, including pH regulators, inhibitors, activators, collectors, foaming agents, etc. The beneficiation process is carried out, and at the same time, the clay minerals that are easy to muddy will be adsorbed on the surface of pyrite, resulting in poor flotation selectivity
Especially for coal gangue with uneven particle size, it is difficult to achieve effective separation by simple gravity separation or flotation.

Method used

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Examples

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Effect test

Embodiment 1

[0023] Example 1: figure 1 As shown, the mineral processing method of reclaiming pyrite from coal gangue adopts the following specific process steps.

[0024] (1) Coal gangue passes through a double-layer vibrating screen after a crushing operation, and the coarse-grained products of 30-5 mm are sorted through a dense medium vibrating chute, and the gangue minerals are used as tailings; the concentrate products are de-mediumed through a linear vibrating screen , the product on the sieve is coarse-grained pyrite, and the product under the sieve is subjected to strong magnetic separation by a wet-type high-strength magnetic separator, the magnetic product is returned to the heavy medium vibrating chute, and the non-magnetic product is fed into the grinding operation of step (3); Among them, the magnetic field strength of the wet strong magnetic separator is 480KA / m, the pulse stroke is 25mm, the pulse frequency is 310 times / min, and the pulp mass concentration is 28%.

[0025] ...

Embodiment 2

[0029] Embodiment 2: This mineral processing method for recovering pyrite from coal gangue adopts the following specific process steps.

[0030] (1) Coal gangue passes through a double-layer vibrating screen after a crushing operation, and the coarse-grained products of 30-5 mm are sorted through a dense medium vibrating chute, and the gangue minerals are used as tailings; the concentrate products are de-mediumed through a linear vibrating screen , the product on the sieve is coarse-grained pyrite, and the product under the sieve is subjected to strong magnetic separation by a wet-type high-strength magnetic separator, the magnetic product is returned to the heavy medium vibrating chute, and the non-magnetic product is fed into the grinding operation of step (3); Among them, the magnetic field strength of the wet strong magnetic separator is 520KA / m, the pulse stroke is 27mm, the pulse frequency is 330 times / min, and the pulp mass concentration is 30%.

[0031] (2) The medium-...

Embodiment 3

[0035] Embodiment 3: This mineral processing method for recovering pyrite from coal gangue adopts the following specific process steps.

[0036] Except following difference, all the other processes are with embodiment 1:

[0037] In step (1): the magnetic field strength of the wet strong magnetic separator is 450KA / m, the pulse stroke is 26mm, the pulse frequency is 350 times / min, and the pulp mass concentration is 35%.

[0038] In step (3): the overflow particle size of the classification equipment is -0.074mm, accounting for 80%; the rotation speed of the sorting surface of the suspension vibrating cone concentrator I is 1.3r / min, the vibration frequency of the disk surface is 400 times / min, and the washing water Velocity is 1.0m 3 / h, the ore feeding rate is 0.32t / h, the pulp mass concentration is 15%; the rotation speed of the sorting surface of the suspension vibrating cone concentrator II is 1.3r / min, the vibration frequency of the disk surface is 350 times / min, and the...

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Abstract

The invention discloses a beneficiation method for recovering pyrites from coal gangue. The method adopts the following processes: (1) the coal gangue is classified by a double-layer vibrating sieve after crushing; classified coarse products are separated by a heavy-medium vibrating chute to obtain concrete products and tailing; and after mediums are removed from the concentrate products, coarse pyrites are obtained; (2) classified intermediate products are separated by an ore sand shaker to obtain intermediate pyrites and tailing; and (3) classified fine products perform the ore grinding classification, the sludge removal, the flotation and the separation to obtain coal and pyrite products and tailing. The method crushes the coal gangue to divide into different coarse and fine particle grades; the coarse particle grade adopts the heavy-medium vibrating chute with relatively lower production cost to separate out coarse gangue minerals so as to reduce the direct ore grinding cost; and in particular, the method is suitable for the coal gangue with nonuniform embedding particle size, can greatly improve the recovery rate of the pyrites, and synchronously extracts other valuable elements in the separation process to increase the additional value.

Description

technical field [0001] The invention relates to a mineral processing method, in particular to a mineral processing method for recovering pyrite from coal gangue. Background technique [0002] Coal gangue refers to the solid waste discharged during the mining and washing process of coal, accounting for about 10% of the total coal production. According to the latest statistics, my country's existing waste rock stockpile is more than 4.5 billion tons, and it is still increasing at a rate of 300 million tons per year. It is one of the solid wastes with the largest output and stockpile in the industry. The stockpiling of gangue not only causes a serious waste of resources, but also pollutes the atmosphere, soil and water sources to varying degrees. If the research on its comprehensive utilization of resources is strengthened, coal gangue can be transformed into useful resources. At the same time, coal gangue in many places contains a certain amount of pyrite. Pyrite is the best ...

Claims

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Application Information

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IPC IPC(8): B03B7/00B03B5/04
CPCB03B5/04B03B7/00
Inventor 张晋霞牛福生张晓亮李卓林徐之帅邹玄于浩刘亚
Owner 唐山联众选煤科技有限公司
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