Breaking grinding dissociation and re-flotation two-stage recovery process of coal in scarce coking

Abstract

A breaking grinding dissociation and re-flotation two-stage recovery process of coal in scarce coking belongs to a coal breaking dissociation flotation process. (1) coal products in a coal preparation plant serve as raw materials, and the coal which is larger than 6mm is rolled and broke into size smaller than 6mm; (2) a desliming screen is used for desliming on middings smaller than 6mm, middings which is 6-0.5mm enters a three-product dense medium cyclone, and dense medium, middings and gangue are obtained after two-stage medium separation is carried out; (3) the middings smaller than 0.5mm is mixed with clean coal magnetic separation gangue, a grading hydrocyclones group is adopted to conduct high frequency screening to obtain high ash fine silt contained slurry water, and coarse particle are mixed with middings on the midding sculping screen to enter a ball mill for wet grinding; and (4) products after grinding enter a flotation column to conduct flotation, foam clean coal and tailing are respectively concentrated, filtered and dewatered to obtain flotation clean coal and tailing products. The breaking grinding dissociation and re-flotation two-stage recovery process has the advantages that the high ash fine silt in fine fraction is pre-selected, pollution of the high ash fine silt is reduced, equipment separation particle size range is reduced, separation accuracy of equipment is improved, and scarce coking coal resources are recovered as far as possible.

Description

technical field [0001] The invention relates to a coal crushing, dissociation and separation process, in particular to a two-stage recycling process of crushing, dissociation and heavy flotation of rare coking coal. Background technique [0002] my country has abundant reserves of coal resources and a complete range of coal types, but the resources of coking coal are relatively scarce, accounting for about 27.6%. Among them, fat coal, coking coal and lean coal account for 3.75%, 6.71% and 4.17% of the total coal resources respectively. Coking coal and fat coal, which are indispensable in the coking industry, are scarce resources. The high-ash, high-sulfur, difficult-to-wash and parts that cannot be used for coking are removed from the current coking coal resources, and the reserves of high-quality coking coal and fat coal resources are even lower. At the same time, at present, most of the medium coal products produced by the washing of coking coal and fat coal in my country...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a two-stage recovery process of crushing, dissociation and heavy flotation of rare coking coal, so as to solve the problem of low utilization rate of existing scarce coking coal resources

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