Gravity separation middling coal separation technology

Abstract

The invention belongs to a coal washing method and discloses a gravity separation middling coal separation technology. Gravity separation middling coal is fed into rough grinding equipment. Products obtained after rough grinding is fed into screening equipment for primary classifying, and primary plus-sieve products and primary minus-sieve products are obtained. The primary plus-sieve products are fed into a dense medium cyclone for separation. The primary minus-sieve products are fed into separation equipment for secondary classification, and secondary plus-sieve products and secondary minus-sieve products are obtained. The secondary plus-sieve products are fed into fine grinding equipment for fine grinding. Products obtained after fine grinding and the secondary minus-sieve products are fed into size mixing equipment together for completing flotation. Two-time ore grinding, gravity separation and floatation combination and classifying separation are combined to separate gravity separation middling coal, under the premise that the middling coal dissociation degree is improved, the phenomena of over crushing are reduced, equipment separation efficiency is obviously improved, clean coal in the middling coal is recycled to the maximum degree, the coal preparation plant clean coal productivity is increased, and enterprise economical benefit is improved.

Description

technical field [0001] The invention relates to a coal separation process, in particular to a gravity separation coal separation process suitable for the coal washing field. Background technique [0002] With the rapid development of dense medium coal preparation technology, dense medium separation technology has been widely used in coking coal preparation plants, and medium coal, as a by-product produced in the dense medium separation process, its ash content is generally close to that of raw coal, which belongs to medium density , It is extremely difficult to select coal resources with poor selectivity. At present, such medium coal resources are mainly wasted directly as civil and power plant fuels, which in turn causes a great waste of my country's scarce coking coal resources. Except for a small amount of low-density clean coal mixed in due to sorting errors, re-selected coal can generally be regarded as a joint body of clean coal and gangue. The medium coal is crushed...

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Problems solved by technology

The patent announcement number is CN103721840A, a kind of medium coal crushing and dissociation TBS main re-selection process and the patent announcement number is CN103894277A, a kind of medium coal crushing and dissociation dense medium cyclone main separation coal slime water secondary flotation process have taken into account the After the medium coal is crushed and dissociated, the yield of clean coal is improved by sorting, but only the conventional crushing equipment and traditional separation technology in the field of coal washing are used to crush and separate the medium coal, and the medium coal crushing is not considered. The problem of over-crushing in the dissociation process and the problem of sorting efficiency of the equipment

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