Separation method for roughing slime through teetered bed separator (TBS) and concentrating coarse slime difficult to separate through slime dense medium cyclone

Abstract

The invention discloses a separation method for roughing slime through a teetered bed separator (TBS) and concentrating coarse slime difficult to separate through a slime dense medium cyclone. Slime of a slime water system is pumped to a hydraulic classification cyclone to be classified, and overflows into flotation equipment to be separated; and underflow enters the TBS, high-ash tailings and coarse clean coal with a high ash content are obtained at a high ascending water velocity under a high bed density, the coarse clean coal enters the slime dense medium cyclone to be concentrated, and finally clean coal and middling products are obtained. According to the method, the advantages of the TBS and the advantages of the slime dense medium cyclone are combined, the advantages are enhanced, and disadvantages are avoided; the coarse slime difficult to separate is roughed through the TBS to obtain the high-ash tailings and the coarse clean coal; by making use of the characteristic that the separation precision of the slime dense medium cyclone is high, the coarse clean coal is concentrated, and the high-quality clean coal meeting the requirements of a low ash content and a high recovery rate is obtained. Not only are the common problems of 'coarse coal running', 'ash carrying' and the like in coal preparation plants solved, but also the technological problems of high-precision separation of the high-ash coarse slime difficult to separate are solved.

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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