A physical crushing and dissociation re-washing process for medium coal

Abstract

The invention relates to a medium coal physical crushing and dissociation re-washing process, which includes the following steps: the medium coal incoming material is subjected to primary crushing and dissociation, the broken and dissociated medium coal is separated by a 1.0 mm coarse screen, and the oversize Enter the secondary crushing, after the secondary crushing, the medium coal is mixed with water and then put into a 1.0mm coarse sieve for coarse separation; the undersieve is added with water to form a medium coal suspension, and then put into a 0.1mm mesh grading sieve; mm sieve mesh grading sieve into the hydrocyclone, the undersize into the flotation system; the secondary grading overflow of the hydrocyclone enters the hydrocyclone, and the underflow enters the flotation system; The overflow part of the water-mediated cyclone is dehydrated by the high-frequency clean coal screen to produce clean coal; the underflow of the water-mediated cyclone enters the 0.5mm medium-sieve screen, and the above-sieve output is medium-sieve, and the under-sieve enters the flotation system . The invention combines the flotation system with the classification of the cyclone, which not only improves the yield of clean coal and fully recovers the clean coal, but also reduces environmental pollution and achieves better social benefits.

Description

technical field [0001] The invention relates to the technical field of coal preparation technology, in particular to a process for physical crushing, dissociation and re-washing of medium coal. Background technique [0002] Medium coal is a mixture of gangue and clean coal separated from raw coal, and is a mixture between clean coal and gangue in raw coal washing. Among the global coal reserves, coking coal is a scarce resource. After washing and processing, coking coal is mainly used for coking and metallurgy, which has high economic value. Usually, the price of coking coal is two to three times that of ordinary thermal coal. In the current washing and selection of coking coal, the main product is clean coal and the by-products are medium coal, tailing coal and gangue. At present, China Coal accounts for more than 6% of the production rate in washing. When coal is sorted, when the content of ±0.1 of the sorting density is greater than 30%, it is called difficult coal sepa...

AI Technical Summary

Problems solved by technology

When coal is sorted, when the content of ±0.1 of the sorting density is greater than 30%, it is called difficult coal separation. Conventional washing methods are difficult to wash, and this part of coking coal can only be used as steam coal, resulting in a great waste of resources.

From the analysis of the formation of coal, first, medium coal was polluted by the environment when it was formed from plants. After hundreds of millions of years of geothermal and ground pressure, the pollutants and coal were densely combined through physical methods, forming a dense coal with a density higher than that of coal and lower than that of coal. The intermediate of gangue; the second is that coal is entrained by gangue, the selectivity is reduced, and the economy becomes poor

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