Coal slime classified concentration device

Abstract

The invention discloses a coal slime classified concentration device which comprises a pool body, a bridge frame arranged on the top of the pool body, a rotating frame arranged in the pool body and a transmission device arranged at the upper part of the pool body and used for driving the rotating frame to rotate, wherein the center of the pool body is provided with a liquid-solid fluidized bed cylinder body the upper part of which is provided with a guide cylinder, the rotating frame is arranged on the outer part of the liquid-solid fluidized bed cylinder body, the liquid-solid fluidized bed cylinder body is internally provided with a concentration sensor connected with a controller, the lower part of the liquid-solid fluidized bed cylinder body is provided with a liquid distributor, a tapered guide groove is arranged below the liquid distributor, and a coarse particle bottom current discharging valve is arranged on a discharging hole of the tapered guide groove. The invention overcomes the defect of a concentrator used in first stage concentration in a coal slime two-concentrating and two-recycling process, and has the advantages of simple structure, small occupation area and lowcapital construction cost.

Description

technical field [0001] The invention relates to a coal slime water graded concentration device, which is especially suitable for the treatment of two-stage concentration and two-stage recovery of coal slime water. Background technique [0002] Coal slime water treatment is an important link in coal preparation production operations. Its main functions are: first, to realize the internal recovery of coal slime and the closed cycle of washing water, to maximize the use of coal resources and save water resources, and to achieve environmental protection; second, to obtain as much water as possible. Clean circulating water creates good production conditions for gravity separation and flotation processes. Generally, the coal preparation plant adopts a single-stage concentration and recovery process, and the concentration tank is used to concentrate and clarify the slime water, the overflow is used as circulating water, and the underflow is recovered by a filter press. In producti...

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Problems solved by technology

In production practice, this process has the following disadvantages: the filter cake has a high moisture content and is easy to stick into agglomerates, so it cannot be directly mixed into medium coal; when there are many fine clay mineral impurities in the coal slime, the unit processing capacity of the filter press is extremely low, It is impossible to recover all the coal slime in time, resulting in a large amount of high-ash fine mud circulating and accumulating in the washing water system, and the concentration of the washing water continues to increase, causing a chain reaction and a vicious circle, which seriously affects the effect of gravity separation and flotation processes; some coal preparation plants Due to some reasons, the control of coarse particles in the production coal slime is not good, a large number of coal particles >0.5mm enter the filter press, the service life of the filter cloth is shortened, and its normal operation is affected; due to the low processing capacity of the filter press, large-scale coal preparation The factory needs a large number of units, and the building volume of the factory building is large, which increases the cost of infrastructure and production

The main problems of this process are: ①The hydraulic classification particle size and underflow concentration of the first-stage thickener are not suitable for control; ②The working condition of the first-stage thickener is greatly affected by the coal quality and processing capacity, which has a great impact on the subsequent coarse coal slime dehydration equipment and The process requirements are relatively strict; ③The overflow of the first stage concentrator enters the second stage by self-flowing method, there is a height difference between the two, the infrastructure is relatively difficult, and the cost is high; it is transported by a pump, no height difference is required but the power consumption is large; ④The first stage uses The concentrator occupies a large area and requires a large investment in infrastructure

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