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Method for improving filtering quality of coal slurry water by compounding biological and nonbiological flocculants for coal

A technology of biological flocculants and filtration performance, applied in biological water/sewage treatment, chemical instruments and methods, water/sludge/sewage treatment, etc. Pollution and other problems, to achieve the effect of reducing adverse effects, reducing restrictions, and expanding the scope of application

Inactive Publication Date: 2016-05-18
ANHUI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a method for improving the filtration performance of coal slime water by compounding coal biological and non-biological flocculants, which has the advantages of reducing the use of non-biological flocculants while significantly improving the filtration performance of coal slime water reduce the restriction of various factors on the filter aid effect, expand the scope of application of compound flocculants, and reduce environmental pollution caused by the use of chemical filter aids.

Method used

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  • Method for improving filtering quality of coal slurry water by compounding biological and nonbiological flocculants for coal
  • Method for improving filtering quality of coal slurry water by compounding biological and nonbiological flocculants for coal
  • Method for improving filtering quality of coal slurry water by compounding biological and nonbiological flocculants for coal

Examples

Experimental program
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Effect test

example 1

[0049] The filtration performance of example 1 coal slime water:

[0050] 1) Take 500mL of coal slime water with a concentration of 40g / L and a pH value of 7, and stir it with a magnetic slow speed stirrer for 5min;

[0051] 2) After standing for 30 minutes, pour off the supernatant, take 200mL of coal slime water flocs to carry out the Buchner funnel filtration test, the calculated filter specific resistance of coal slime water flocs is 57.119×10 9 cm / g.

example 2

[0052] Example 2 adds the coal slime water filtration performance of coal biological flocculant Bacillus subtilis:

[0053] 1) Take 450mL of coal slime water with a concentration of 50g / L, stir evenly, and then add 2% CaCl 2 Coagulant aid 5mL, stir with a magnetic slow speed stirrer for 1min;

[0054] 2) Add 10mL of coal bioflocculation agent Bacillus subtilis, add coal slime water to 500mL, adjust the pH value of the coal slime water to 7 with a pen-type pH meter, and then stir slowly with a magnetic stirrer for 5 minutes;

[0055] 3) After standing for 30 minutes, pour off the supernatant, take 200mL of coal slime water floc to carry out the Buchner funnel filtration test, the calculation shows that the filtration specific resistance of coal slime water floc is 1.2277×10 9 cm / g.

example 3

[0056] Example 3 adds the coal slime water filtration performance of coal bioflocculant white-rot fungus:

[0057] 1) Take 450mL of coal slime water with a concentration of 40g / L, stir evenly, and then add 2% CaCl 2 Coagulant aid 10mL, stir with a magnetic slow speed stirrer for 1min;

[0058]2) Add 15mL of coal bioflocculation agent Bacillus subtilis, add coal slime water to 500mL, adjust the pH value of the coal slime water to 7 with a pen-type pH meter, and then stir slowly with a magnetic stirrer for 5 minutes;

[0059] 3) After standing for 30 minutes, pour off the supernatant, take 200mL of coal slime water floc to carry out the Buchner funnel filtration test, the calculation shows that the filtration specific resistance of coal slime water floc is 1.0361×10 9 cm / g.

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Abstract

The invention relates to a method for improving filtering quality of coal slurry water by compounding biological and nonbiological flocculants for coal. According to the method, a coal biological flocculant Bacillus subtilis solution culture raw liquor or white-rot fungi solution culture raw liquor and a coal nonbiological flocculant polyacrylamide (PAM) are compounded in a volume ratio of 1:X as biological and nonbiological flocculants. 8-14 mL of a 2 wt% coagulant aid CaCl2 water solution is added into the coal slurry water, the biological and nonbiological compound flocculants are added, and the pH value of the coal slurry water is regulated to 6-8, thereby improving the filtering quality of the coal slurry water floc under the biological and nonbiological synergistic actions. The method obtains favorable filter aiding effects, obviously lowers the specific filtration resistance of the coal slurry water floc, reduces the consumption of the coal nonbiological flocculant, lowers the restriction of various factors to the filter aiding effects, widens the applicability of the compound flocculants, and lowers the problems of environmental pollution and the like caused by the use of the chemical filter aids.

Description

technical field [0001] The invention relates to a method for compounding coal biological and non-biological flocculants to improve the filtration performance of coal slime water. Background technique [0002] Coal washing process produces a large amount of slime water, which concentrates the finest and most difficult particles in the raw coal. Due to the fine particle size, high ash content, high viscosity and poor filtration performance of these particles, it is very difficult to use conventional dehydration equipment. Difficult to handle effectively. In order to realize the closed-circuit circulation of slime water and recycling in the slime plant, to achieve full utilization of resources and maximize benefits, filter aids can be used to improve the filtration performance of slime water. [0003] Most of the filter aids used in the current dehydration technology are chemical filter aids, which are generally divided into surfactant type and polymer flocculant type. These ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/34
CPCC02F3/34
Inventor 张东晨常飞闫佳陈占冀敏敏范晓露戴雯
Owner ANHUI UNIV OF SCI & TECH
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