Method for subsiding and purifying slime water by electrolytic process

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...

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 tends to accumulate in the concentrated solution during the concentration process, causing the concentration of circulating water to exceed the standard, which in turn affects the normal operation of the entire system. Mudized coal and gangue are likely to cause high fine mud content. Although high-efficiency coagulants are used, the clarification effect cannot be achieved, resulting in washing water concentrations as high as 200-500g / L, and coal washing efficiency is extremely low. Therefore, it is necessary to formulate a reasonable coal It is of great significance to realize the closed cycle of coal washing and washing water in the muddy water treatment scheme

Images