A flotation process to effectively reduce the pollution of high ash and fine mud in clean coal

Abstract

The invention discloses a floating technology for effectively reducing pollution of high ash content slime in clean coal, and belongs to an efficient floating method for microgranular coal. According to the technology, a direct flotation technology is firstly adopted to recycle all clean coal and part of high ash content slime floating along with the clean coal, a reverse flotation technology is adopted to enable the high ash content slime obtained through the direct flotation technology and carried in the clean coal to be floated out, and finally, the clean coal which has the qualified quality and meets the clean coal ash content requirement is obtained; on the basis of a conventional roughing and selection two-section technology, the reverse floatation technology is adopted to enable a small amount of high ash content slime in the roughing clean coal to be floated out of pulp through foam, so that consumption of medicament floatation and power is greatly reduced, and the phenomenon that when a large number of solid particles float through foam, mechanical mixing and water flow entrainment of the high ash content slime and clean coal particles happen is effectively avoided; in terms of mineral particle recycling manner, the pollution of the high ash content slime to the clean coal is avoided, the quality of the clean coal is ensured, and high-precision sorting of a large amount of coal slime in the high ash content slime is achieved.

Description

technical field [0001] The invention relates to a coal slime flotation deep ash reduction process, in particular to a flotation process for effectively reducing high-ash fine mud pollution in clean coal, and belongs to the field of high-efficiency and clean coal processing technology. Background technique [0002] Flotation is currently the most mature and effective method for sorting fine-grained and fine-grained coal slime, and has been industrialized. However, with the improvement of coal mining mechanization in my country's coal mines and the continuous deepening of mining depth, the quality of coal is getting worse and worse. The large-scale promotion of the dense medium cyclone separation process is equipped with direct recovery of coarse coal slime or separation and recovery. Links and the "fine, miscellaneous, and difficult" characteristics of my country's coal resources themselves lead to the remarkable characteristics of finer particle size, higher ash content and m...

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the problems of finer and finer particle size, higher ash content and more and more difficult separation of floating coal slime in the traditional coal preparation process, the present invention provides a method for effectively reducing the pollution of high-ash fine mud in clean coal. Flotation process, which is suitable for high-precision separation of high-ash fine slime and large-scale coal slime, has low production cost, flexible product structure, effectively reduces the pollution of high-ash fine slime to flotation clean coal, and realizes clean coal Flotation process for deep ash reduction

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