Method for subsiding and purifying slime water by electrolytic process

A technology of coal slime water and electrolysis method, which is applied in the fields of coal slime water sedimentation purification, clear water coal preparation, and fine-grained strengthening, and can solve problems such as difficult sedimentation, high ash content, and affecting the effect of separation and washing of coal

Inactive Publication Date: 2009-08-05
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] With the improvement of coal mining mechanization, the proportion of fine-grained coal is increasing. These particles have fine particle size, high ash content, high viscosity, and are difficult to settle. The slime water formed by these fine-grained coal and water seriously affects the separation and washing of coal. effect, and even make the entire coal preparation and washing system unable to operate normally, which directly affects the effect and efficiency of coal preparation and washing
[0005] For a long time, the purification problem of refractory coal slime has been difficult to solve. Coal slime with a large content of refractory fine particles te

Method used

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  • Method for subsiding and purifying slime water by electrolytic process
  • Method for subsiding and purifying slime water by electrolytic process
  • Method for subsiding and purifying slime water by electrolytic process

Examples

Experimental program
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Effect test

Embodiment 1

[0135] Add the electrolyte solution from the addition funnel to the electrolytic cell: 5ml of magnesium chloride aqueous solution, stir at a constant speed for 5min, and mix it with the coal slime water; Then stir with an electric mixer for 10 minutes; then pump out the slime water electrolyte into the settling bottle, add 2ml of flocculant polyacrylamide into the settling bottle, mix with the slime water, and the coal slime will settle rapidly in the form of flocs and separate from the water.

Embodiment 2

[0137] Add electrolyte to the electrolytic cell from the addition funnel: 5ml of sodium chloride aqueous solution, stir at a constant speed for 5min, to make it mix with the coal slime water; then add 5ml of sodium hydroxide aqueous solution, stir at a constant speed for 5min, the pH value of the coal slime water mixture is 9, Slightly alkaline; then stir with an electric mixer for 10 minutes; then pump out the coal slime water electrolyte into the settling bottle, add 2ml of flocculant polyacrylamide into the settling bottle, mix it with the coal slime water, and the coal slime will settle rapidly in the form of flocs, and the water will separate.

Embodiment 3

[0139] Add electrolyte solution from the addition funnel to the electrolytic cell: ferric chloride aqueous solution 5ml, stir at a constant speed for 5min to make it mix with the coal slime water; then add 5ml of sodium hydroxide aqueous solution, stir at a constant speed for 5min, the pH value of the coal slime water mixture is 9, Slightly alkaline; then stir with an electric mixer for 10 minutes; then pump out the coal slime water electrolyte into the settling bottle, add 2ml of flocculant polyacrylamide into the settling bottle, mix it with the coal slime water, and the coal slime will settle rapidly in the form of flocs, and the water will separate.

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Abstract

The invention relates to a method for settling and purifying coal slurry water through electrolysis, which comprises the steps of selecting chemical substances, preparing an electrolyte and a flocculating agent and carrying out electrolysis for settlement and purification with power supplied by a 36V DC powder supply, wherein the flocculating agent is polyacrylamide, the electrolyte is aluminum chloride or magnesium chloride, and sodium chloride, ferric chloride, aluminum sulfate and calcium oxide, deionized water is used as a solvent, sodium hydroxide is used as an alkalinity adjusting agent, a graphite tube is used as an anode, a stainless steel electrolytic cell is used as a cathode, the coal slurry and water are separated through the DC powder supply electrolysis, stirring and combination reaction, the turbidity of water obtained after separation is 8.92NTU, the coal slurry grains are round and smooth and loosely piled, and compared with the prior art, the sedimentation speed is increased by 20 percent, the turbidity is reduced by 16 percent compared with the prior art, and the use of the polyacrylamide is reduced to 23 grams for per ton of raw coal. Therefore, the method is an ideal method for settling and purifying coal slurry water, represents the first like technology in China, and can be widely promoted and used in the technical field of coal dressing.

Description

technical field [0001] The invention relates to a method for sedimentation and purification of coal slime water by electrolysis, and belongs to the technical field of clean water coal preparation, fine particle strengthening, and sedimentation purification of coal slime water. Background technique [0002] Coal excavated from underground coal mines is a mixture containing various chemical substances, such as: carbon, hydrogen, oxygen, nitrogen, sulfur, phosphorus, etc. In industrial applications, raw coal is often washed, the most commonly used method It is washing with water as the medium. The combination of coal and water forms a mixture of slime water. The formation of slime water also provides environmental conditions for the dispersion and aggregation of solid particles, and also brings difficulties to coal washing. . [0003] Coal washing is a closed cycle of washing water, and water cleaning is a key link in coal washing. [0004] With the improvement of coal mining...

Claims

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Application Information

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IPC IPC(8): B01D21/00
Inventor 董宪姝姚素玲侯基贵刘爱荣胡晓洁杨晶晶孙玲王志忠
Owner TAIYUAN UNIV OF TECH
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