Classifying dropping-type coal slurry pretreating device

Abstract

The invention belongs to the field of coal slime powder pretreating, and specifically relates to a classifying dropping-type coal slurry pretreating device. The classifying drop-type coal slurry pretreating device provided by invention at least comprises a dropping box and a classifying dropping system, wherein a flotation agent feeding part and a coal slurry feeding part are correspondingly arranged above the classifying dropping system, the classifying dropping system comprises sliding plates which are arranged in a space layering manner, and the sliding plates which are arranged in a layer-by-layer manner are joined each other from head to end so as to form a channel for mixing and traveling of coal slurry and a flotation agent. The device also comprises a splitting unit, wherein the splitting unit is at least arranged on the discharge end of one layer of sliding plate, and the splitting end of the splitting unit is positioned on the layering surface of dropping paths of low-ash-content coarse granules and high-ash-content fine clay of the coal slurry on the layer of sliding plate. Through a stripping effect of the splitting unit on high-ash-content fine clay and low-ash-content coarse granules, the pollution of the high-ash-content fine clay to floatation fine coal is farthest lightened, the operating efficiency of the classifying dropping-type coal slurry pretreating device is improved, meanwhile, the practical input amount of the flotation agent is also greatly reduced, and the control on the pretreating cost is facilitated.

Description

technical field [0001] The invention belongs to the field of coal slime powder pretreatment, and in particular relates to a graded drop type coal slurry pretreatment device. Background technique [0002] Because the buoyancy of coal slime in our country is generally poor, coal slurry pretreatment is an indispensable link in the flotation coal preparation process, and it is a prerequisite for the flotation machine to obtain good technical and economic indicators. The necessity of coal slurry pretreatment mainly includes the following four points: 1) Fully disperse the flotation agent, the flotation agent of coal slime is insoluble or slightly soluble in water, only when it is fully dispersed into a large number of tiny droplets, can the It is evenly mixed into the coal slurry; 2) The dispersed flotation agent is well mixed in the floating coal slurry, and the non-polar oil collector forms a relatively stable oil film on the surface of coal particles with different diameters, ...

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Problems solved by technology

As a relatively advanced coal slurry pretreatment device in the field, the above structure effectively solves the problem of different pretreatment time required for fine mud with high ash content and coarse particles with low ash content, so as to better realize the floating of low ash coarse particles. However, in actual use, the defects of the above structure should not be underestimated: firstly, since the slide plate itself constitutes a channel for the coal slurry to travel, during operation, no matter how thick or fine the coal slurry particles, it is inevitable to pass through one by one The surface of each skateboard is of course beneficial to increase the mixing effect of the agent with low ash and coarse particles, but at the same time, the high ash fine mud will still be unnecessarily contaminated with too much flotation agent, which will not participate in the later stage of flotation. It is completely unnecessary for the high ash fine mud finally captured, and the fine slime has a large specific surface area, strong adsorption capacity, and a non-polar oil collector that is very easy to adsorb, that is, it will still enter the flotation machine Finally, the selectivity of flotation will become poor, which will affect the quality of clean coal; The airtight box that forms a closed space can avoid the meaningless drift of mist medicine. The arrangement of the sealed box often causes problems such as poor working environment of the fogging plate and easy delivery of product failures in actual use. The slurry mixing process can be visually observed, and it is difficult to detect faults in time, which brings troubles to the on-site operation and maintenance work; in addition, it requires too high a speed of the motor that drives the fogging disc to rotate, that is, it must use a motor with a speed of up to 3000 rpm secondary motor, which poses serious challenges to the actual assembly, purchase and maintenance costs

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