Coarse slime separation overflow pulp desliming process method

Abstract

A coarse slime separation overflow pulp desliming process method uses high-performance screening superiorities of a derrick lamination type high-frequency vibration fine screen, enables coarse slime separation overflow pulp to be led in each barrel-shaped pulp distributor through each connection pipeline, and enables the overflow pulp to be evenly distributed on each screen of the corresponding derrick lamination type high-frequency vibration fine screen through the barrel-shaped pulp distributors. Discharge holes of the barrel-shaped pulp distributor respectively correspond to five layers of screen of the derrick lamination type high-frequency vibration fine screen one by one. The process has the advantages of being simple, high in efficiency, practical, big in handling capacity, low in power dissipation, small in maintenance amount, small in floor area and the like, solves the problem that the coarse slime separation overflow pulp is high in ash content due to carried high-ash-content fine fraction particles, overcomes shortcomings of the existing sieve bend, high frequency linear vibrating screen and high frequency circular vibrating screen equipment when conducting desliming work, improves material concentration, substantially improves production efficiency, and substantially improves economic benefits.

Description

technical field [0001] The invention relates to a process capable of realizing efficient and accurate desliming of coarse coal slime separation and overflow pulp, and belongs to the technical field of coal washing and processing in coal preparation plants in the coal industry. Background technique [0002] With the development of modern coal mining technology and the continuous improvement of the degree of mechanization, the content of fine-grained coal (primary coal slime) in raw coal inevitably shows an increasing trend. The slime content in the coal is increased, and the particle size grades that need to be classified and sorted in the coal preparation process increase. For materials with a particle size of 1-0.3mm, the coal slime disturbed bed separator (Teetered Bed Seprator, referred to as TBS) sorting process, coal slime spiral separator sorting process, Coarse slime separation process such as dense medium cyclone slime separation process, and the technology is relat...

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Problems solved by technology

However, there is a common problem: because the above-mentioned coarse coal slime separation process has a certain lower limit of particle size, the high-ash fine mud at the lower limit of the separation particle size inevitably enters the overflow slurry, resulting in coarse coal slime separation. The ash content of the overflow slurry after selection is relatively high, so it cannot be directly used as the final clean coal product after dehydration

At present, most of the overflow slurry desliming technologies for coarse coal slime separation in China use vibrating arc screens, high-frequency linear vibrating screens, high-frequency circular vibrating screens and other equipment. These process equipment generally have poor desliming effects. Low efficiency, large maintenance, high power consumption, frequent material blockages during production, unstable ash content of clean coal, sometimes high ash content of coarse and clean coal products, and large equipment footprint; these problems directly Affect the economic benefit of coal preparation plant

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