A method of hydrogen and oxygen plasma combined enhanced coal slime flotation

Abstract

The invention discloses a method of hydrogen and oxygen plasma combined enhanced coal slime flotation, which comprises the following steps: the dry coal slime is selectively treated with hydrogen plasma to improve the surface hydrophobicity of organic matter, and directly expand its floatability with inorganic minerals The conventional collectors are first fully dispersed by emulsification, and then activated by oxygen plasma in an aqueous solution environment, which improves the collection performance of the agent; the dry coal slime treated with hydrogen plasma and the dry coal sludge treated with oxygen plasma The chemical solution is mixed and slurried to make the chemical and the coal slime fully adsorbed; the above slurry is fed into the flotation device after being stirred with a foaming agent, and the air bubbles are introduced to enrich the combustibles in the foam, so that the inorganic minerals do not float up and the combustibles are realized. efficient recycling. By adopting the method of the invention, the dosage of coal slime flotation agent can be significantly reduced, the recovery rate of combustible body can be effectively improved, and the loss of clean coal can be significantly reduced.

Description

technical field [0001] The invention relates to the field of flotation, in particular to a method for combined hydrogen and oxygen plasma enhanced coal slime flotation, and is particularly suitable for the plasma enhanced flotation ash method of oxidized coal, low-rank coal and other difficult-to-float coals. Background technique [0002] Flotation is a mature and effective method for improving the quality of coal slime. The surface of coal slime is often modified by chemicals to improve the hydrophobicity of the slime surface, but the dispersion effect of non-polar chemicals such as diesel and kerosene in the water environment is not good. On this basis, some scholars emulsify non-polar chemicals , which improves its dispersion effect in aqueous solution, and the compound medicine is thus produced. Some collectors containing polar functional groups such as tetrahydrofuran, biodiesel, oxidized diesel, etc. can also collect organic matter more efficiently. Some scholars use...

AI Technical Summary

Problems solved by technology

Some scholars use dielectric barrier oxygen plasma to directly modify non-polar collectors to prepare heteropolar collectors for flotation of low-order coal slimes. However, this method is not suitable for non-polar collectors in the flotation environment (water environment). Polar collectors are modified, but the pure agents are modified, which is different from the actual flotation situation

[0003] In addition, the method of improving the surface hydrophobicity of coal slime by adsorption of chemicals only indirectly modifies the surface of coal slime, and the hydrophobicity of coal slime itself does not change. At present, there is a lack of methods to directly modify the surface hydrophobicity of coal slime.

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