Brown coal reverse-flotation medicament combination use method

A technology for reverse flotation and lignite, which is applied in flotation, solid separation, etc., can solve the problems of unmodified lignite being difficult to sort, and achieve the effects of improving sorting effect, flotation speed and sedimentation effect.

Inactive Publication Date: 2012-11-14
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for using a combination of lignite reverse flotation reagents to solve the difficult problem of unmodified lignite separation by traditional flotation methods

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Example 1: Lignite with a grinding fineness of -74 μm, particle size content of 40.47%, ash content of 14.26%, and moisture content of 22.20% is used as reverse flotation feed, and it is adjusted to a pulp with a concentration of 10%. The amount of sodium chloride added is 0.3 mol / L, and the dosing amount for flotation feed is 2500 g / t of inhibitor causticized cornstarch, and then 5000 g of collector dodecylamine hydrochloride is added to the pulp / t, and finally add foaming agent methyl isobutyl carbinol 200 g / t, can obtain reverse flotation clean coal with ash content of 9.86%, and clean coal combustible body recovery rate of 63.61%. Compared with no addition of sodium chloride, the flotation rate constant K value of reverse flotation is changed from 0.149 min -1 increased to 0.433 min -1 , The recovery rate of ash increased from 48.41% to 56.70%.

[0016] The order of adding the four agents used above is: soluble sodium salt sodium chloride, inhibitor causticized c...

Embodiment 2

[0021] Example 2: Lignite with a grinding fineness of -74 μm, particle size content of 31.73%, ash content of 52.59%, and moisture content of 20.16% was used as reverse flotation feed, and it was adjusted to a pulp with a concentration of 8%. The amount of sodium chloride added is 0.3 mol / L, and the amount of dosing for flotation feed is 3000 g / t of inhibitor causticized cornstarch, and then 6000 g of collector dodecylamine hydrochloride is added to the pulp / t, and finally adding 200 g / t of frother methyl isobutyl carbinol, the reverse flotation clean coal with ash content of 24.52% can be obtained, and the recovery rate of clean coal combustibles is 39.21%. Compared with no addition of sodium chloride, the flotation rate constant K value of reverse flotation is changed from 0.154 min -1 increased to 0.443 min -1 , The recovery rate of ash increased from 80.46% to 91.81%. Others are the same as in Example 1.

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Abstract

A brown coal reverse-flotation medicament combination use method belongs to a fine particle coal separate method. The method comprises the following steps of: mixing brown coal which is finely ground so that the monomer granularity achieves basic dissociation into ore slurry with preference concentration; firstly adding soluble salt (sodium chloride) to stir; adding an inhibiting agent (causticizing corn starch) to stir; then adding a collecting agent (dodecyl amine-hydrochloride) to stir; and finally adding a foaming agent (methyl isobutyl carbinol) to stir; and the brown coal reverse-flotation medicament combination use method is characterized in that the soluble salt is added in the brown coal reverse-flotation, and four medicaments are combined for use. The brown coal reverse-flotation medicament combination use method has the advantages that the conventional floating agent is used, and the flotation of thin brown coal granules without modification is realized by using a reverse-flotation method through the combination of medicaments, namely, mineral granules with high ash float out from foams as a goal object; and simultaneously, according to the method, the flotation rate of mineral is increased, the separating effect is improved, the sedimentation rate of ore slurry is quickened, and the sedimentation of separated ore slurry is facilitated. Compared with the direct flotation, the stronger the hydrophilicity of the surface of brown coal is, the better the reverse-flotation effect is; and therefore, the disadvantages are changed into the advantages.

Description

technical field [0001] The invention relates to a fine-grained coal separation method, in particular to a method for combining lignite reverse flotation reagents. Background technique [0002] As a kind of low-quality coal, lignite is easy to weather when exposed to air and muddy when exposed to water due to its high water content and high ash content. It has not yet been developed on a large scale like high-rank coal. However, with the dwindling of high-quality coal resources, lignite with abundant reserves will surely become one of the main energy sources in my country in the future. Flotation, as an important separation method for fine-grained minerals, can effectively reduce the ash content in coal slime. However, due to the poor floatability of lignite, it has not been applied to lignite separation so far. [0003] Conventional coal slime flotation mainly uses the difference in hydrophobicity between coal and gangue surface, uses kerosene or diesel oil as collector, pi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03D1/00B03D1/018B03D101/02B03D101/04B03D101/06
Inventor 张海军刘炯天王永田曹亦俊
Owner CHINA UNIV OF MINING & TECH
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