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Coarse clean coal regrinding recleaning separation technique

A coarse-fine and rough separation technology, applied in flotation, solid separation, etc., can solve the problems that restrict the quality of clean coal products, product recovery rate and low production efficiency, and achieve significant economic benefits, low operating costs, and reduced pollution. Effect

Inactive Publication Date: 2012-05-02
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the separation of high-ash refractory coal slime, this process generally has the defects of low product recovery and production efficiency, which seriously restricts the quality of the final clean coal product

Method used

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  • Coarse clean coal regrinding recleaning separation technique
  • Coarse clean coal regrinding recleaning separation technique
  • Coarse clean coal regrinding recleaning separation technique

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Such as figure 1 As shown, the coarse and clean coal regrinding re-selection and separation process of the present invention is the first choice for pulping operation: the flotation agent and the directly floating coal slime are fed into the mixing tank together, and then fed into the mixing tank by gravity after stirring and pulping by the impeller. to the coarse flotation column or flotation machine; then carry out the rough separation operation of the coarse flotation column or flotation machine: the fed pulp is roughed by the flotation column or flotation machine to obtain flotation coarse clean coal and rough separation tailings ;Finally, the rough separation and clean coal dehydration is carried out, and then grinding and re-selection operation: the flotation coarse clean coal then enters the sedimentation filter type centrifugal dehydrator for dehydration operation, and the coarse clean coal product and clean coal filtrate are obtained, and the clean coal filtrate...

Embodiment 2

[0022] Such as image 3 As shown, in the coarse and clean coal regrinding and re-selection and separation process of the present invention, the pulping operation is first carried out: the flotation agent and the directly floating coal slime are fed into the mixing tank together, and then fed into the mixing tank by gravity after being stirred and pulped by the impeller. to the coarse flotation column or flotation machine; then carry out the rough separation operation of the coarse flotation column or flotation machine: the fed pulp is roughed by the flotation column or flotation machine to obtain flotation coarse clean coal and rough separation tailings ;Then carry out rough separation and clean coal dehydration and then grinding and re-selection operation: the flotation coarse clean coal then enters the sedimentation filter type centrifugal dehydrator for dehydration operation, and the coarse clean coal product and clean coal filtrate are obtained, and the clean coal filtrate ...

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Abstract

The invention discloses a coarse clean coal regrinding recleaning separation technique, comprising the following steps of: firstly taking a floating agent and coal floatation into a stirring barrel; stirring, pulping, and automatically flowing to a roughing floatation column or a floatation machine; obtaining floated coarse clean coal and roughing floatation tailing coal after roughing floatation through the floatation column or the floatation machine; taking the floated coarse clean coal into a precipitation filter type centrifugal dehydrator to carry out dehydration operation so as to obtain coarse clean coal products and clean coal filter liquor; directly taking the clean coal filter liquor into the clean floatation column or the floatation machine to carry out cleaning operation; taking the coarse clean coal into a ball grinder to carry out ore grinding operation; and taking the grinded coarse clean coal products to the clean floatation column or the floatation machine to carry out cleaning operation so as to obtain final clean coal and cleaned tailing coal. According to different coal quality conditions, the cleaned tailing coal can be used as final tailing coal, or returned to an ore pulp preparation operation for re-separation, therefore the recovery rate of the floatation clean coal is improved. The coarse clean coal regrinding recleaning separation technique has the advantages of simple technique, less investment, low power consumption, low operation cost, high separation efficiency and obvious economic benefits.

Description

technical field [0001] The invention relates to a coal slime separation process, in particular to a separation process suitable for rough separation of clean coal, fine grinding and dissociation, followed by re-selection. Background technique [0002] Coal is the main energy source in my country, accounting for about 70% of primary energy. In a long period of time in the future, the dominant position of coal in my country's energy structure will not change. With the improvement of my country's coal mining mechanization, the deterioration of resource geological conditions, the large-scale construction of coal preparation plants and the wide application of dense medium separation technology, the proportion of high-ash refractory coal slime has increased sharply and continues to deteriorate, making coal The contradiction of mud sorting is more prominent. The characteristics of high-ash refractory coal slime are mainly manifested in the aspects of large coal content, high ash co...

Claims

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Application Information

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IPC IPC(8): B03D1/00B03D1/08
Inventor 桂夏辉刘炯天陶秀祥王永田张海军
Owner CHINA UNIV OF MINING & TECH
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