Steam coal all-grade selected and simplified heavy medium separation process

Abstract

The invention discloses a steam coal all-grade selected and simplified heavy medium separation process. The process comprises classification; separation of coarse-particle coals; separation of fine-particle coals; medium and water removal of coarse-particle products; circulation, recovery and replenishing of coarse-particle coal mediums; medium and water removal of fine-particle products; and circulation, recovery and replenishing of fine-particle coal mediums. Coal slime is separated and recovered; after raw coals are classified, oversize products serve as the coarse-particle coals to enter a non-pressure three-product heavy medium cyclone for separation, and undersize products serve as the fine-particle coals to enter a pressure three-product heavy medium cyclone for separation; and after magnetic-separated tailing is concentrated, dehydrated and recovered, concentrate coal and medium coal products are doped. The coarse-particle coals are separated by the heavy-medium cyclone, so that the high-density separation of low-density suspension is realized, the separation density is reduced, the medium consumption is effectively reduced, and the wet mud removing link before separation of the fine-particle coals in a conventional process is saved; and the process is wide in application range, simple, convenient for operation, high in separation efficiency, flexible in product structure, low in production operation cost, low in capital investment and accordant with national environment protecting requirements.

Description

Technical field [0001] The invention relates to a raw coal separation process, in particular to a simplified heavy-medium separation process for full-stage selection of steam coal. Background technique [0002] my country's coal resources are relatively abundant, and the power industry is the main force in my country's coal consumption. Due to the pressure of environmental protection, although my country is actively developing new forms of power generation such as wind, water conservancy and nuclear power, thermal power generation has been used in my country for a long time and the technology is mature. For a long period of time, thermal power generation is still the mainstay. In other words, in the next few decades, thermal coal, namely thermal coal, will be the main consumer of coal in China. [0003] Power plants have high requirements for the quality of thermal coal, mainly due to the characteristics of coal combustion and ash content. However, the types of coal in China are c...

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Problems solved by technology

[0005] The present invention aims at the deficiencies in the prior art of complex systems, inconvenient management, large plant volume, high construction investment, and high production and operation costs, and provides a sorting method with high sorting efficiency, flexible product structure, low production and operation costs, and easy realization of full fractionation of raw coal. Separation, a simplified dense-medium separation process that reduces infrastructure investment

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