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Method for smashing coal gangue through rollers at high pressure and recovering coal

A technology of coal gangue and high-pressure roller, which is applied in the field of high-pressure roller crushing of coal gangue and recovery of coal, and coal gangue processing, which can solve problems such as environmental pollution and land occupation, and achieve improved sorting accuracy, reasonable recycling and utilization, and reduced The effect of wasting resources

Inactive Publication Date: 2014-08-06
UNIV OF SCI & TECH LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A large amount of coal gangue stockpiled and being discharged has not only occupied a large amount of land, but also caused serious environmental pollution.

Method used

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  • Method for smashing coal gangue through rollers at high pressure and recovering coal
  • Method for smashing coal gangue through rollers at high pressure and recovering coal
  • Method for smashing coal gangue through rollers at high pressure and recovering coal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Coal gangue is the washing gangue of the coking coal washing plant, and the ash content is 63.62%. Use high-pressure roller mills to classify coal gangue after superfine crushing. The process steps are as follows:

[0023] (1) Use a jaw crusher to crush the coal gangue to a feed particle size suitable for high-pressure roller mill crushing below 20mm;

[0024] (2) Carry out high-pressure roller mill ultra-fine crushing to the crushed coal gangue. The pressure between the rollers during the high-pressure roller mill work is 5.5MPa, the roll speed is 1.6m / min, and the roll gap is 3mm. After the high-pressure roller mill is ultra-fine crushed The product should be sieved with a sieve with a sieve hole of 3mm. The material on the sieve is returned to the high-pressure roller mill to be combined with the new feed material and then crushed. The material under the sieve is deslimed. The products after sliming should be re-selected on a shaking table to obtain coarse clean coa...

Embodiment 2

[0029] Coal gangue is the washing gangue of the coking coal washing plant, and the ash content is 71.79%. Use high-pressure roller mills to classify coal gangue after superfine crushing. The process steps are as follows:

[0030] (1) Use a cone crusher to crush the coal gangue to a feed particle size suitable for high-pressure roller mill crushing below 20mm;

[0031] (2) Carry out high-pressure roller mill ultra-fine crushing to the crushed coal gangue. The pressure between the rollers during the high-pressure roller mill work is 6.0MPa, the roll speed is 1.0m / min, and the roll gap is 3mm. After the high-pressure roller mill is ultra-fine crushed The product should be sieved with a sieve with a sieve hole of 3mm. The material on the sieve is returned to the high-pressure roller mill to be combined with the new feed material and then crushed. The material under the sieve is deslimed. The products after the slime are re-selected by a spiral separator to obtain coarse clean coa...

Embodiment 3

[0036] Coal gangue is the washing gangue of the coking coal washing plant, and the ash content is 71.91%. Use high-pressure roller mills to classify coal gangue after superfine crushing. The process steps are as follows:

[0037](1) Use a jaw crusher to crush the coal gangue to a feed particle size suitable for high-pressure roller mill crushing below 50 mm;

[0038] (2) Carry out high-pressure roller mill ultra-fine crushing to the crushed coal gangue, the pressure between the rollers when the high-pressure roller mill is working is 4.0MPa, the roll speed is 3.0m / min, the roll gap is 6mm, and the high-pressure roller mill is ultra-fine. The product should be sieved with a sieve with a sieve hole of 6mm. The material on the sieve is returned to the high-pressure roller mill to be combined with the new feed material and then crushed. The material under the sieve is deslimed. The products after the slime are re-selected by a spiral separator to obtain coarse clean coal I and ga...

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Abstract

The invention discloses a method for smashing coal gangue through rollers at high pressure and recovering coal. The method comprises the following steps that the coal gangue is smashed into the size below the upper limit of the feeding particle size suitable for smashing conducted by a high-pressure roller mill; high-pressure roller grinding superfine smashing is conducted on the coal gangue, de-sliming is conducted on the smashed products, the de-slimed products are reselected, and coarse cleaned coal I and gangue slag I are obtained; floatation is conducted after slurry mixing and stirring are conducted on de-slimed slime water, and floatation cleaned coal II and floatation tailings II are obtained; the coarse cleaned coal I and the floatation cleaned coal II are combined and then ground, rougher flotation, concentration and scavenging are respectively conducted on the ground products once, floatation cleaned coal and floatation tailings III are obtained, and gangue slag II is obtained after the floatation tailings II and the floatation tailings III are combined and filter-pressed; the gangue slag I and the gangue slag II are conveyed to a brick factory to serve as raw materials for making bricks or be comprehensively used. According to the method, the dissociation degree of the smashed products is high, the follow-up reselection and floatation effects are good, and therefore coal resources in the coal gangue are recycled and used fully and reasonably.

Description

technical field [0001] The invention belongs to the technical field of mineral processing, and relates to the processing technology of coal gangue, in particular to a method for crushing coal gangue with high-pressure rollers and recovering coal. Background technique [0002] As an energy resource, coal plays an extremely important role in national economic and social development. Coal gangue is solid waste generated during coal production and processing, and its emissions account for about 10%-20% of coal output, making it one of the largest industrial solid wastes. A large number of coal gangue stockpiled and being discharged not only encroached on a large amount of land, but also caused serious environmental pollution. Therefore, with the continuous consumption of coal resources, it is of great significance for the rational utilization of coal resources and environmental protection to develop and research efficient separation methods to recover clean coal from coal gangu...

Claims

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Application Information

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IPC IPC(8): B03B7/00B03D1/02
Inventor 侯英胡军李晓安朱巨健王恩雷
Owner UNIV OF SCI & TECH LIAONING
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