Process for extracting clean coal from middling coal

Abstract

The invention discloses a process for extracting clean coal from middling coal, and belongs to the technical field of coal mine flotation processes. The process comprises the following steps of S1 pretreatment, and specifically, pretreatment of the middling coal is carried out, and impurities are removed; S2, crushing, and specifically, the pretreated middling coal is crushed; S3, stirring. and specifically, a mixture is obtained by stirring after the crushed middling coal is mixed with water and a flotation agent; S4, flotation, and specifically, flotation is carried out on the mixture to obtain the preliminary clean coal and tail coal; and S5, clean coal obtaining, and specifically, the clean coal is obtained after the preliminary clean coal is dehydrated. According to the process for extracting the clean coal from the middling coal, the clean coal in middling coal can be extracted through simple impurity removal, crushing, stirring, flotation and dehydration, compared with the multiple times of crushing, grading and screening in the prior art, the process is simple, an independent production unit can be formed, the influence is not caused to an original production process, thegrading is not needed after the crushing, stirring and flotation are directly carried out, and the clean coal in the middling coal can be fully extracted.

Description

technical field [0001] The invention belongs to the field of secondary washing of clean coal in the coal washing industry, and in particular relates to a process for extracting clean coal from middling coal. Background technique [0002] Coal resources are precious one-time resources, and refined coal for smelting is rare and very valuable. During the washing process of the current coal washing plant, due to the coal preparation process, about 18%-30% of the clean coal contained in the medium coal is not washed out, which wastes precious resources. In the case of increasing the amount of raw coal, the clean coal that cannot be completely washed out by the existing technology is extracted through the secondary flotation technology, and the clean coal in the raw coal is really eaten and squeezed to increase the output of clean coal and improve the economic benefits. [0003] In the prior art, raw coal includes clean coal, middling coal, gangue and coal slime, among which mid...

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Problems solved by technology

[0004] In the prior art, there is a process for recovering medium coal to form clean coal. For example, in the patent application number 201610445056.7, a process for recovering clean coal from medium coal is disclosed, which involves crushing medium coal twice and then classifying it in two stages Finally, return to the original flotation machine for re-stirring flotation, the process is complicated, the cost of technical transformation is high, and after the classification treatment, a large part of the clean coal in the underflow larger than 0.25mm has not been recycled

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