Method for microbial ash removal of coal

A microbial and coal technology, applied in the field of coal microbial deashing, can solve the problem of difficult removal of ash from coal slime, and achieve the effects of good deashing effect, extensive culture conditions and mild treatment conditions.

Inactive Publication Date: 2016-08-10
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for microbial deashing of coal to solve the problem that some coal, especially coal slime, are difficult to remove ash by existing physical and chemical coal preparation methods. The present invention can also be used for the preparation of ultra-pure coal

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The coal sample with an ash content of 40.85% is difficult to dissociate monomers due to the association of coal with the minerals that make up the ash content.

[0025] The concrete steps that adopt the present invention to carry out microbial deashing are as follows:

[0026] (1) The coal sample is crushed to less than 0.074mm;

[0027] (2) Preparation of liquid medium (sucrose 5.0 g / L, Na 2 HPO 4 2.0 g / L, MgSO 4 •7H 2 O 1.0 g / L, FeCl 3 0.01 g / L, CaCl 2 0.1 g / L, kaolin 0.5 g / L), add pulverized coal samples to the liquid medium, make a coal slurry with a mass concentration of 10%, adjust the pH value to 7.3, and sterilize by high-pressure steam;

[0028] (3) Introduce the Paenibacillus polymyxa into the coal slurry in step (2), the inoculated amount is 10% of the volume of the culture medium, and cultivate it in a constant temperature shaking incubator at 30°C, and the speed of the shaking incubator is 150 r / min, The deashing time is 7d;

[0029] (4) Deashed...

Embodiment 2

[0032] The ash content is 30.24% of coal slime, the particle size less than 0.045mm accounts for 51.38%, and the ash content of this particle size is 42.92%. The gangue minerals are mainly kaolin, illite and quartz.

[0033] The concrete steps that adopt the present invention to carry out microbial deashing are as follows:

[0034] (1) The coal sample is crushed to less than 0.074mm;

[0035] (2) Preparation of liquid medium (sucrose 2.0 g / L, Na 2 HPO 4 1.0 g / L, MgSO 4 •7H 2 O 0.5 g / L, FeCl 3 0.005 g / L, CaCl 2 0.15 g / L, add pulverized coal samples into the liquid medium, make a coal slurry with a concentration of 20%, adjust the pH value to 7.5, and sterilize by high-pressure steam;

[0036] (3) Inject 15% Paenibacillus polymyxa into the coal slurry in step (2), cultivate in a constant temperature shaking incubator at 28°C, the rotating speed of the shaking incubator is 200 r / min, and the deashing time is 4 days;

[0037] (4) Deashed coal was filtered, washed three t...

Embodiment 3

[0040] The ash content is 9.03% lignite clean coal, and the ash content is kaolin and quartz.

[0041] The concrete steps that adopt the present invention to carry out microbial deashing are as follows:

[0042] (1) The coal sample is crushed to less than 0.074mm;

[0043] (2) Preparation of liquid medium (Na 2 HPO 4 2.0 g / L, MgSO 4 •7H 2 O 0.75 g / L, FeCl 3 0.01 g / L, CaCl 2 0.1 g / L, kaolin 0.6 g / L), add pulverized coal samples to the liquid medium, make a coal slurry with a concentration of 15%, adjust the pH value to 7.0, and sterilize by high-pressure steam;

[0044] (3) Inject 20% of Paenibacillus polymyxa into the coal slurry in step (2), cultivate in a constant temperature shaking incubator at 30°C, the rotating speed of the shaking incubator is 180 r / min, and the deashing time is 3 days;

[0045] (4) Deashed coal was filtered, washed 5 times with water, and dried at 75°C for analysis.

[0046] The test results of this embodiment are: the clean coal yield is 92...

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Abstract

The invention discloses a method for microbial ash removal of coal, and belongs to the technical field of coal washing selection processing. The method comprises the following steps: crushing coal into granularities of less than 0.074 mm by virtue of a crusher, mixing a coal sample and a microbial liquid culture medium according to a certain proportion for sterilization treatment, inoculating a paenibacillus polymyxa strain into the sterilized culture medium, performing culturing in a constant temperature oscillation incubator, and finally performing filtration, washing and drying. According to the method, ash in difficult-to-float coal can be effectively removed, and the ash removal rate can maximally reach 70 percent. The method is easy to operate, mild in treatment condition and low in cost, and not only are active ingredients in the coal preserved, but also microbial culture cost is relatively lower.

Description

technical field [0001] The invention relates to a method for microbial deashing of coal, belonging to the technical field of coal washing and processing. Background technique [0002] Coal is an important fossil energy source. Raw coal is mixed with various mineral impurities during the formation process, and rocks and other impurities on the roof and floor are inevitably mixed in during the mining and transportation process. In order to improve the quality of coal, coal resources should be used reasonably and effectively. Raw coal must be washed and deashed. At present, there are mainly the following conditions that restrict coal washing and deashing in my country: First, most of the coal preparation plants in my country use dense medium or jigging as the main separation process, which will produce a large amount of secondary coal slime, resulting in The selectivity of coal slime becomes worse, the ash content of flotation clean coal is high, and the yield loss of main clea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L5/04C10L9/00C12N1/20C12R1/12
CPCC10L5/04C10L9/00C10L2290/54C12N1/20
Inventor 杨志超张素红刘生玉郭建英
Owner TAIYUAN UNIV OF TECH
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