Dense-medium coal separation method

Abstract

The invention relates to a dense-medium coal separation method. The method comprises the steps that firstly, the liquid level of a coal slime qualified medium barrel is kept to be higher than the liquid level of a raw coal qualified medium barrel; secondly, the undersize fractional flow of a cleaned coal medium drainage curve screen is controlled to be 1.15-1.2 times of the input amount of a coal slime dense-medium cyclone, so that the coal slime qualified medium barrel is in an overflow state all the time during production; thirdly, the overflow of the coal slime dense-medium cyclone is purposefully led into a cleaned coal magnetic separator or the raw coal qualified medium barrel; fourthly, cleaned coal magnetic separation tailings are led into a cone tank with a deep cone angle for primary fine particle classification, and low-density high-ash fine slime is removed, wherein the overflow particle size is -0.10 mm size fraction, and the underflow is 1-0.10 mm size fraction; fifthly, the underflow (1-0.10 mm) part of the cone tank with the deep cone angle is conveyed to a high-frequency electromagnetic undersize sieve through a pump and secondary fine particle classification is conducted for removing high-density high-ash fine slime. According to the dense-medium coal separation method, the problems about separation and classification of fine coal (0.1-0.075 mm) are effectively solved. The work conditions of the flotation link are improved; the ash content of flotation tailings is effectively increased by setting the processing power of a flotation machine.

Description

technical field [0001] The invention relates to a dense medium coal preparation method, in particular to a dense medium coal preparation method for processing fine coal. Background technique [0002] In the prior art, neither the jigging coal preparation method nor the dense medium coal preparation method can effectively process raw coal with a particle size of 1-0 mm, resulting in a serious waste of resources. The 1-0mm raw coal that cannot be effectively processed enters the finished product as a semi-finished product. Since the ash content of 1-0mm raw coal is 4-5% higher than that of the finished product, its yield accounts for about 1 / 3 of the raw coal. After entering the finished product link, the ash content of the final product will generally be 1-2% higher than the expected value. . In order to balance the impact of this part of ash on the final product, it is necessary to reduce the ash in the dense medium or jigging part, which will further increase the loss of ...

AI Technical Summary

Problems solved by technology

The replenishment of circulating water will reduce the separation density of the suspension, and the slime cyclone cannot achieve normal separation under the condition of low density.

In this case, there will be an abnormal phenomenon of high ash content in the overflow and low ash content in the underflow

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