Wide-grain-grade double-dense-medium process for separating all coarse coal slime

Abstract

The invention discloses a wide-grain-grade double-dense-medium process for separating all coarse coal slime. The wide-grain-grade double-dense-medium process includes that raw coal is preliminarily sieved, manually picked and graded, then oversize products can be used as coarse grain coal, the coarse grain coal is fed into a non-pressure tri-product dense-medium cyclone to be separated, undersize products are concentrated and graded and then are dehydrated in an underflow manner to be used as fine grain coal, the fine grain coal is fed into a pressure tri-product dense-medium cyclone to be separated, and excess flow is fed into a flotation filter-press system, so that the coal slime can be separated; qualified suspension liquid of a fine grain coal dense-medium separating system is provided by coarse grain clean coal of a coarse grain coal separating system, lower branches of coarse grain middling coal primary-section medium removing equipment and branches of coarse grain clean coal and coarse grain middling coal magnetic separation concentration; dilute suspension liquid of coarse grain gangue products and dilute suspension liquid of middling coal and gangue products of a fine grain coal system are treated together; magnetic separation tailings are used as wetting water or primary spray water for grading screens. The wide-grain-grade double-dense-medium process has the advantages that the fine grain coal dense-medium system has a medium automatic generating function, all the coarse coal slime can be efficiently separated by dense media, the suspension liquid is circulated in a closed-loop manner, the separation efficiency is high, the products are flexible in structure, and the production and operation costs are low.

Description

technical field [0001] The invention relates to a sorting process of raw coal, in particular to a sorting process capable of realizing wide particle size double mediation and all coarse coal slime. Background technique [0002] With the improvement of the degree of mechanized coal mining and the deepening of mining depth, the content of gangue increases, the amount of pulverized coal increases, and the coal slime presents the characteristics of fineness, high ash, and large content of associated organisms. The existing coal preparation technology is systematically complicated. , low sorting efficiency, inconvenient management, large plant size, high construction investment, high production and operation costs, etc., are far from meeting the needs of the coal preparation industry to build large-scale intelligent, efficient and integrated coal preparation plants. Moreover, the selectivity of raw coal has become worse, and our country is in a critical period of structural trans...

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Problems solved by technology

[0003] In order to meet the needs of building a large-scale intelligent, efficient and integrated coal preparation plant, the present invention aims at the problems of complex systems, low sorting efficiency, inconvenient management, large plant volume, high construction investment, and high production and operation costs in the prior art. The invention provides a high-efficiency sorting process with high sorting efficiency, flexible product structure, low production and operation costs, and reduced infrastructure investment, which can realize wide-grained double-media coarse coal slime high-efficiency sorting

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