Multi-stage dissociation-machine and column combined recleaning technology for middling coal intergrowth body of coking fat coal

Abstract

The invention provides a multi-stage dissociation-machine and column combined recleaning technology for a middling coal intergrowth body of coking fat coal, and belongs to a coal separation method. The multi-stage dissociation-machine and column combined recleaning technology comprises the following steps that middling coal of the coking fat coal is fed into quick rough grinding equipment; a product obtained after rough grinding is fed into sieving equipment; a first-time oversize product is returned to be fed into the quick rough grinding equipment, a first-time undersize product is fed intoseparation equipment, and first-time sorted clean coal is fed into fine grinding equipment; a product obtained after fine grinding is fed into the sieving equipment to be subjected to second-time sieving, a second-time oversize product is returned to be fed into the fine grinding equipment, and the second-time oversize product is fed into the sieving equipment to be subjected to third-time sieving; the oversize product is fed into second-time separation equipment to be subjected to separation, and an undersize product is fed into the series separation equipment to be subjected to separation. Dissociation of the middling coal intergrowth body with the fine disseminated grain size is achieved, the recovery rate of coarse particles is effectively increased through stage flotation, the selectivity of fine particles is effectively improved through stage flotation, the recovery rate of the clean coal and the ash content of the clean coal are ensured, the multi-stage dissociation-machine andcolumn combined recleaning technology is simple and reliable in procedure, and the clean coal in the middling coal of the coking fat coal is recovered to the maximum extent.

Description

Technical field [0001] The present invention designs a multi-stage dissociation-mechanical column combined re-selection process of medium-coal conjoined bodies of fat coal, and is especially suitable for a multi-stage dissociation of coking-fat coal contiguous bodies used in the field of coking and fat coal dissociation and reconcentration. Separation-machine column combined reselection process. Background technique [0002] Coking fat coal is a scarce coal in my country and a national strategic material, but its reserves account for less than one-third of the total coal reserves. Due to the common characteristics of poor coal quality and high content of impurities in coking coal, the sorting produces 20%-30% of medium coal. With the deterioration of resource conditions, the sorting of coking coal shows a deteriorating trend. Its outstanding performance is that the coking fat coal has a large contiguous body content, and the inorganic minerals and organic coal rock components ar...

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Problems solved by technology

[0004] Aiming at the deficiencies of the above-mentioned technologies, it provides a multi-stage solution for medium-coal conjoined body of coke-fat coal with simple steps and high efficiency, which fundamentally solves the problem of medium-coal re-election that the existing scarce coke-fat coal resources cannot be recycled and reused. Off-column joint re-election

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