Steam coal dense medium separation process capable of effectively reducing slime content

Abstract

The invention discloses a steam coal dense medium separation process capable of effectively reducing slime content. The process comprises a raw coal preparing system, a fine coal dry method deep finesremoval system, a block coal dense medium separation system, a fine coal dense medium separation system, and a slime water treatment system. The relaxation sieving dry method deep fines removal process is adopted in 3 mm raw coal grading, the fine-particle-size dry method screening is adopted for enabling the slime amount in the subsequent fine coal washing process link is greatly reduced, the running load of the slime water system is effectively relieved, the secondary slime amount is reduced, the clean coal water is reduced, the commercial coal quality is further improved, meanwhile, due toreduction of the slime content, stability of the fine coal medium circular system is ensured, medium consumption is reduced, the running number of slime water treatment devices is reduced, and production cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of coal separation technology, and relates to a steam coal dense medium separation technology which can effectively reduce the amount of coal slime. Background technique [0002] Thermal coal consumption accounts for about 70% of my country's total coal consumption. At present, thermal coal preparation plants generally adopt 13mm (25mm) grading, lump coal shallow groove dense medium sorting machine sorting, and fine coal is not washed. With the development of the market economy and the improvement of environmental protection requirements, the country's requirements for the washing rate of raw coal are gradually increasing. In order to increase the selection rate of raw coal, the thermal coal preparation plant adopts the method of full size selection, which produces a large amount of coal slime that is difficult to handle and utilize. Due to the high moisture content and low calorific value of the coal slime...

AI Technical Summary

Problems solved by technology

The washing of a large amount of powdered coal not only fails to increase the calorific value of commercial coal, but also leads to a large coal slime water treatment system, which increases the difficulty of production management and increases operating costs, which greatly reduces the economic benefits of the enterprise.

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