Coal washing medium powder and coal washing process

Abstract

The invention provides a coal washing medium powder and a coal washing process. The coal washing medium powder contains magnetic material larger than 97.8% in content, particles 91.3% in content and sulfur less than 0.1% in content. The coal washing process includes the steps of 1), feeding the coal washing medium powder into a medium storage tank for standby; 2), feeding raw coal into a circulating coal crushing device prior to being fed into a classifier; 3), allowing the classifier to pick out crushed raw coal in the step 2); 4), feeding the raw coal materials stored in the medium storage tank into a three-product dense medium cyclone; 5), using a medium removing unit to have coal washing medium obtained in the step 4) recycled and reconfiguring dense medium suspension liquid; 6), using a dewatering unit to have watery coal subjected to medium removing in the step 5) dewatered to obtain clean coal, middlings and gauge products. By application of the coal washing process, the clean coal obtained by raw coal washing contains ash content stably around 0.5%, continuous coal washing can be achieved, and the coal washing process is suitable for being widely promoted and applied in the coal industry.

Description

technical field [0001] The invention relates to a coal washing medium powder, in particular to a coal washing medium powder and a coal washing process. Background technique [0002] Coal washing is an important process in the deep processing of coal. The ash content carried by the raw coal after washing is greatly reduced, and the pollutants and ash produced after combustion are greatly reduced, realizing the clean utilization of coal. At present, the highest standard for the grade of coal washing medium powder used in the coal industry is that the content of magnetic substances is more than 95%, the particle content of -325 mesh particle size in coal washing medium powder is greater than 90%, and the sulfur content of coal washing medium powder is less than 0.1%. The coal washing medium powder can reduce the ash content in the clean coal to about 2% after washing the raw coal. In the actual production process, most batches of coal washing medium powder that meet the above ...

AI Technical Summary

Problems solved by technology

When coal-fired enterprises use unwashed raw coal as fuel, the pollutants emitted will increase significantly compared with burning clean coal, and the combustion efficiency is very low. The ash content in raw coal is high, and it is difficult to clean up the residue after combustion. In addition, since most of my country's coal-producing areas are far away from economically developed areas with large coal consumption, the coal transportation volume is large and the transportation distance is long. The average coal transportation distance is about 600 kilometers. a lot of capacity

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