Floating technology for effectively reducing pollution of high ash content slime in clean coal

A clean coal and fine mud technology, applied in flotation, solid separation, etc., can solve the problems of high ash content, difficult separation, fine particle size, etc., and achieve the effect of reasonable structure, reasonable recovery method and pollution avoidance

Inactive Publication Date: 2015-12-09
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • Floating technology for effectively reducing pollution of high ash content slime in clean coal
  • Floating technology for effectively reducing pollution of high ash content slime in clean coal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Gas coal with a particle size of less than 0.5mm and an ash content of 24.49% is used as flotation feed. In the flotation feed, the particle size is less than 0.045mm, the content is 62.88%, and the ash content is 33.08%. The actual production requires that the ash content of the flotation clean coal of this coal sample is less than 9.00%.

[0043] When adopting conventional primary flotation, kerosene is used as collector, and 2-octanol is used as foaming agent. Test procedure: The coal sample is configured into 1.5L of 60g / L pulp, and poured into a 1.5L single tank hanging tank type mechanical agitation flotation machine, and the spindle speed of the flotation machine is 1900rad / min. The flotation pulp is pre-stirred for 2 minutes, then 1200g / t of kerosene is added to the pulp and stirred for 2min, then 300g / t of 2-octanol is added and stirred for 0.5min, and the air intake valve is opened for timing and foaming for 3min, and the air volume is 0.25m 3 / h, deionized ...

Embodiment 2

[0047] Coking coal with a particle size of less than 0.5mm and an ash content of 37.71% is used as flotation feed. In the flotation feed, the particle size is less than 0.045mm, the content is 65.07%, and the ash content is 48.45%. The actual production requires that the ash content of the flotation clean coal of this coal sample is less than 11.00%.

[0048] When adopting conventional primary flotation, kerosene is used as collector, and 2-octanol is used as foaming agent. Test procedure: The coal sample is configured into 1.5L of 60g / L pulp, and poured into a 1.5L single tank hanging tank type mechanical agitation flotation machine, and the spindle speed of the flotation machine is 1900rad / min. The flotation pulp is pre-stirred for 2 minutes, then 1000g / t of kerosene is added to the pulp and stirred for 2 minutes, then 500g / t of 2-octanol is added and stirred for 0.5min, the air intake valve is opened for 2.5min, and the air volume is 0.25m 3 / h, deionized water is added d...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03D1/00
Inventor 夏文成谢广元彭耀丽沙杰倪超周成龙卜祥宁金明国陈昱冉
Owner CHINA UNIV OF MINING & TECH
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