A sorting method for rough coal slime with disturbed bed dense medium cyclone for selection of refractory coarse coal

Abstract

The invention discloses a sorting method for selecting and refractory coarse coal slime in an interference bed coarse selection coal slime dense medium cyclone, pumping the coal slime in the coal slime water system to the hydraulic classification cyclone for classification, and overflowing into the flotation equipment for classification The underflow enters the disturbed bed separator, and under the higher rising water velocity and higher bed density, high ash tailing coal and coarse clean coal with high ash content are obtained, and the coarse clean coal enters the slime re-separator Clean coal and medium coal products are finally obtained. This process combines the advantages of disturbed bed and coal slime dense medium cyclone to maximize strengths and circumvent weaknesses. It uses TBS to rough and difficultly separate coarse coal slime to obtain high-ash tailing coal and coarse clean coal, and then uses the coal slime dense medium cyclone to separate the finer High features Select coarse and clean coal to obtain high-quality clean coal with low ash content and high recovery rate. It not only solves common problems such as "running coarse" and "carrying ash" in coal preparation plants, but also solves the technical problem of high-precision separation of high-ash and difficult-to-separate coarse coal slime.

Description

technical field [0001] The invention relates to a coal slime sorting method, in particular to a disturbed bed rough coal slime dense medium cyclone selection refractory coarse coal slime sorting method. Background technique [0002] As my country's main energy source, coal will account for about 70% of the total primary energy production and consumption for a long time to come. In order to meet the energy demand of rapid economic development, the amount of coal mining is increasing year by year, and the task of coal washing is very arduous. With the improvement of coal mining mechanization and the continuous deepening of coal mining depth, the proportion of coal slime in raw coal increases year by year and the quality gradually deteriorates. The effective separation of coarse coal slime is one of the urgent problems to be solved in the coal preparation industry. The lack of equipment and methods with high separation accuracy for this particle size range has seriously restri...

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Problems solved by technology

It has a good separation effect for easy-to-separate coal, but the height of the fuselage is large, and the method parameters are not easy to adjust when the coal quality changes. When the separation density is low, the separation effect is poor.

Its poor adaptability to feed fluctuations and high separation density are the key to restricting its application in coarse coal slime separation; the density of the resuspension liquid in the slime dense medium cyclone is close to the separation density, so the separation accuracy is high. When using the slime dense medium cyclone to separate the difficult-to-separate coarse coal, although clean coal with qualified ash content can be obtained, the intermediate material with medium ash content and some low-ash materials will be lost in the underflow tailing coal, which is not conducive to coarse coal Reasonable recovery of slime resources; since TBS (interference bed) adopts water medium separation, for the coarse coal slime that is extremely difficult to separate, in the required ash grade, the content of the separation density is high, and the difference in the sedimentation velocity of the material is small, which is very easy It leads to mismatch, which leads to serious "dusting" of the main washing system, resulting in serious loss of technical and economic benefits

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