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High-pressure roller final grinding and screening method of middling coal

A technology of high-pressure roller mills and high-pressure rollers, which is applied to chemical instruments and methods, flotation, solid separation, etc., can solve problems such as unfavorable boiler operation, reduced boiler efficiency, increased heavy oil combustion, etc., and achieves significant energy-saving and consumption-reducing effects , Reasonable recycling and utilization, and the effect of improving sorting accuracy

Inactive Publication Date: 2014-03-12
UNIV OF SCI & TECH LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When medium coal is directly used as fuel, it is unfavorable to the operation of the boiler. In addition to the reduction of boiler efficiency, there are also phenomena such as a significant drop in boiler temperature, unstable combustion, and deterioration of liquid slag discharge, which significantly reduces the reliability and economy of boiler operation. performance, increase the combustion of heavy oil
Thereby reducing the power generation efficiency, increasing the cost of power generation, polluting the environment, and causing a waste of resources

Method used

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  • High-pressure roller final grinding and screening method of middling coal
  • High-pressure roller final grinding and screening method of middling coal
  • High-pressure roller final grinding and screening method of middling coal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] China Coal is selected coal from the coking coal washing plant, the particle size is less than 200mm, and the ash content is 24.00%. The high-pressure roller final grinding system is used to carry out flotation after the medium coal is pulverized. The process steps are as follows:

[0023] (1) Medium coal is crushed with a cone crusher, and the crushed products should be screened with a sieve with a sieve hole of 30mm. The material on the screen is returned to the cone crusher for crushing, and the material under the screen enters the silo;

[0024] (2) Set the working parameters of the high-pressure roller mill, the high-pressure roller crushing is completely open, the pressure between the rollers is 6.0MPa, the roller speed is 10r / min, and the roller gap is 3mm. After the high-pressure roller mill runs normally, set the speed of the feeding belt to 0.25m / s, the speed of the rotor of the V-type powder classifier to 50r / min, and the speed of the dust collector to 3000r / ...

Embodiment 2

[0028] China Coal is selected coal from the coking coal washing plant, the particle size is less than 50mm, and the ash content is 39.05%. The high-pressure roller final grinding system is used to carry out flotation after the medium coal is pulverized. The process steps are as follows:

[0029] (1) Medium coal is crushed by a high-pressure roller mill. The crushed product should be screened with a sieve with a mesh size of 10mm. The material on the screen is returned to the high-pressure roller mill for crushing, and the material under the screen enters the silo;

[0030] (2) Set the working parameters of the high-pressure roller mill, the high-pressure roller crushing is completely open, the pressure between the rollers is 3.0MPa, the roller speed is 20r / min, and the roller gap is 2mm. After the high-pressure roller mill runs normally, set the speed of the feeding belt to 0.5m / s, the speed of the rotor of the V-type powder classifier to 200r / min, and the speed of the dust co...

Embodiment 3

[0034] China Coal is selected coal from the coking coal washing plant, the particle size is less than 50mm, and the ash content is 21.84%. The high-pressure roller final grinding system is used to carry out flotation after the medium coal is pulverized. The process steps are as follows:

[0035] (1) Medium coal is crushed by a jaw crusher. The crushed products should be screened with a sieve with a sieve hole of 20mm. The material on the screen is returned to the jaw crusher for crushing, and the material under the screen enters the silo;

[0036] (2) Set the working parameters of the high-pressure roller mill, the high-pressure roller crushing belt edge material circulation, the pressure between the rollers is 4.0MPa, the roller speed is 30r / min, and the roller gap is 3mm. After the high-pressure roller mill runs normally, set the speed of the feeding belt to 0.25m / s, the speed of the rotor of the V-type powder classifier to 300r / min, and the speed of the dust collector to 10...

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Abstract

The invention discloses a high-pressure roller final grinding and screening method of middling coal, and belongs to the technical field of mineral processing. The method comprises the following steps that (1) the middling coal is crushed to be below the upper limit of the grinding particle size of a final grinding system; (2) the work parameters of a high-pressure roller mill are set, after the high-pressure roller mill idles normally, the rotating speed of a feeding belt, the rotating speed of a V type powder concentrator rotor and the rotating speed of a dust collector are set, then a spiral conveyer is started and materials are fed into a high-pressure roller mill hopper in sequence, a roller press flap valve is opened, and a high-pressure roller final grinding experiment is carried out; (3) water is added to high-pressure roller final grinding products for size mixing and stirring, the high-pressure roller final grinding products with the water are fed into flotation equipment, collecting agents and foaming agents are added in sequence to carry out roughing, fine selection and scavenging once, and flotation clean coal and flotation tailing are obtained. Compared with a traditional method that flotation is carried out after the middling coal is crushed and ball-milled, the dissociation degree of the products is high, the follow-up flotation effect is good, and coal resources are fully and reasonably recycled and used.

Description

technical field [0001] The invention belongs to the technical field of mineral processing, in particular to a high-pressure roller final grinding and sorting method for middling coal. Background technique [0002] Coal is the energy resource with the widest distribution and the largest reserves in my country, and occupies an extremely important position in my country's national economic and social development. Although my country has abundant coal resources, the distribution of coal types and quantities is extremely unbalanced, and major coking coals such as fat coal, coking coal, and lean coal are scarce. According to statistics, in addition to lignite accounting for 12.7% of the proven reserves, in hard coal, low metamorphic bituminous coal accounted for 42.4% of the total, and lean coal and anthracite accounted for 17.3%. The amount of medium-metamorphic bituminous coal is small, accounting for only 27.6%, and most of them are gas coal, accounting for 46.9% of medium-met...

Claims

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Application Information

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IPC IPC(8): B03D1/00B03B1/00B03B7/00
Inventor 侯英
Owner UNIV OF SCI & TECH LIAONING
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