Fine particle coal dehydration method

A technology for fine-grained coal and moisture, applied in the field of coal processing, can solve problems such as reducing the moisture of filter cakes, and achieve the effects of reducing the moisture content of filter cakes, improving economic benefits, and increasing calorific value

Inactive Publication Date: 2017-11-10
DATONG COAL MINE GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The test results show that some types of surfactants can reduce the moisture content of the filter cake, but they have not been widely used in the industry due to the price, the preparation of the medicament, and the sulfur element contained in the molecule.

Method used

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  • Fine particle coal dehydration method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Ethyl oleate containing oleic acid groups was selected as the filter aid.

[0019] Preparation method of filter aid emulsion: weigh 100g of the drug, add 250ml of water under stirring, and continue stirring for 20-30min to obtain the filter aid emulsion.

[0020] Fine-grained coal pressure filtration test: the ash content of the test sample is 30%, the particle size of the sample is -0.5mm, and the content of -200 mesh is 30%. Prepare pulp with a concentration of 320g / L-350g / L, add the dosage of medicament according to 100, 200, 300, 400, 500g / t dry coal slime, stir for 5min, pour into the cup of the pressurized filter, the bottom of the cup Spread a 200-mesh filter cloth, open the breather valve, and start pressurized filtration. The pressure of the gas introduced is controlled at 0.25 MPa with a pressure control valve. During the filtration process, the pressure in the cup remains basically unchanged during the cake forming stage. After the filter cake is formed, it ...

Embodiment 2

[0024] Methyl oleate containing oleic acid groups was selected as the filter aid.

[0025] The preparation method of the filter aid emulsion and the pressure filtration test process of fine coal are the same as in Example 1. The difference from Example 1 is that the concentration of the prepared slurry is 350g / t dry coal slime, and the dosage of the agent is 100, 200, 300, 400 , 500g / t dry coal slime, the obtained filter cake moisture were 15.93%, 18.72%, 15.84%, 16.67%, 15.17%.

Embodiment 3

[0030] Butyl oleate containing oleic acid group is selected as filter aid.

[0031] The filter aid emulsion preparation method and the fine coal pressurized filtration test process are the same as in Example 1, and the difference from Example 1 is that the gas pressure of the feed is controlled at 0.2MPa by a pressure control valve. When 400, 500g g / t dry coal slime, the moisture content of the obtained filter cake is 15.93%, 17.74%, 17.12%, 16.88, 17.71%, respectively.

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Abstract

The invention discloses a fine particle coal dehydration method. A filter aid based on an oleic acid base is selected, an emulsion is prepared from the filter aid, and then a pressure filtration test is performed for removing moisture in fine particle coal. The method is directed at the fine particle coal with filter cakes having relatively high moisture content, the proper filter aid emulsion is adopted, existing filter equipment is not changed, a pressure filter or a plate-and-frame filter press is adopted for a filter test, and the purposes of reducing the filter cake moisture and increasing heat value of the fine particle coal can be achieved, so that the method has great significance in increasing economic benefits of enterprises.

Description

technical field [0001] The invention relates to a method for dehydrating fine-grained coal, which belongs to the technical field of coal treatment. Background technique [0002] Coal users at home and abroad have higher requirements for clean coal utilization and higher product moisture requirements. The problem of product dehydration has become an important aspect of improving coal quality and efficiency. The key to determining the moisture content of the product is the moisture content of the fine coal. Due to the improvement of coal mining mechanization and the change of coal quality itself, the amount of slime in the coal preparation plant has increased significantly, especially the increase in the content of high-ash fine mud, which has reduced the processing capacity of the filter press and increased the moisture content of the filter cake. . On the premise of not changing the existing slime treatment process, adding chemical filter aids is the fastest, easiest and q...

Claims

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Application Information

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IPC IPC(8): B01D37/02B01D37/03B01J20/22C10L5/04
CPCB01D37/02B01D37/03B01J20/22C10L5/04C10L2250/08C10L2290/08C10L2290/24C10L2290/547
Inventor 刘爱荣贾怀军樊民强仝效常晓华李志红周智超李勇陈文武吴广明刘轶柴利文
Owner DATONG COAL MINE GRP
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