Coal slime treatment process for deslimed dense-medium coal separation

Abstract

Disclosed is a coal slime treatment process for deslimed dense-medium coal separation. In the process, part of coal slime including magnetically separated clean coal tailings, magnetically separated middling coal tailings, magnetically separated gangue tailings and dehydrated filtrate of floatation separated clean coal is used as flush water for a wet-process classifying screen or a desliming screen and used as spray water for the same, and clean coal centrifugate is used as the primary spray water for a clean coal medium drainage screen. On the premise of guaranteeing feed concentration in floatation separation, work load of a concentrator can be lowered (by 20-40%), higher separation precision in gravity separation operation is maintained, better separation effect can be achieved in thecrude slime separation link and the fine slime flotation link, the recovery rate of crude particles in centrifugate is increased while medium consumption of coal separation plants is reduced, primaryinvestment, floor area and processing cost for deslimed dense-medium coal separation plants are decreased, product quality is improved, and higher economic benefit can be achieved.

Description

technical field [0001] The invention relates to a coal slime water treatment process, in particular to a coal slime water treatment process suitable for desliming heavy medium coal preparation. Background technique [0002] my country's coal demand is increasing year by year, which promotes the improvement of coal mining mechanization, the deepening of mining depth, and the mining of some coal seams and coal fields with poor coal quality. At the same time, the proportion of fine and ultrafine particles in coal also increases. The production practice shows that the sorting density of materials increases with the decrease of particle size, and the materials have obvious objective rules of layering according to particle size besides density layering. The same machine washing of all particle sizes will inevitably cause pollution to clean coal. [0003] Due to the use of magnetite powder, coal slime and water to form a suspension in dense medium coal preparation, the material ca...

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Problems solved by technology

However, dry desliming not only has low desliming efficiency, but also has a large amount of dust and poor working environment; traditional wet desliming operations use circulating water as spray (flush) water. In order to obtain higher desliming efficiency, increasing The method of large circulating water volume reduces the concentration of slime water, increases the load of the slime water system (increased equipment selection or the number of equipment in the slime water system), increases the primary investment cost and floor area, and It has seriously affected the feed concentration and separation effect of coarse slime separation and fine slime flotation; due to the low feed concentration of flotation, the thickener needs to clarify a large amount of water, which increases the consumption of chemicals in the production process, making Higher processing costs

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