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Sorting method of oxidized coal slurry

A technology for coal oxidation and separation, applied in flotation, solid separation and other directions, can solve the problems of low recovery rate of flotation, large consumption of oxidized coal, etc., and achieve the effects of significant economic benefits, low operating costs, and poor selectivity.

Active Publication Date: 2017-05-17
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide an oxidized coal slime separation technology based on CO2 micro-nano bubbles to treat pulp, which fundamentally solves the problems of high chemical consumption of oxidized coal and low flotation recovery rate

Method used

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  • Sorting method of oxidized coal slurry

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Experimental program
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Effect test

Embodiment 1

[0031] Such as figure 1 , a method for sorting oxidized coal slime based on CO2 bubbles, comprising the following steps:

[0032] Pass CO2 gas into water tank A and mix with water 1 to prepare CO2 saturated aqueous solution. Feed the prepared CO2 saturated aqueous solution into the mixing tank C through the pump B, adjust the pH value of the aqueous solution to 7 by adding NaOH4 to the saturated CO2 aqueous solution, mix the oxidized coal 5 and the CO2 aqueous solution, and pass the fully mixed pulp 6 through the pump D Feed into the mixing tank E, and add the flotation agent 7 and the foaming agent 8, the flotation pulp 9 is obtained after the pulp pretreatment, and the flotation pulp 9 is fed into the flotation column F through the pump, and the clean coal 10 is obtained by flotation and tailings11.

[0033] The ratio of CO2 saturated solution, oxidized coal slime, foaming agent and flotation agent is to add 69g of oxidized coal slime, 0.002g of foaming agent and 0.03g of ...

Embodiment 2

[0037] Such as figure 1 , a method for sorting oxidized coal slime based on CO2 bubbles, comprising the following steps:

[0038] Pass CO2 gas into water tank A and mix with water 1 to prepare CO2 saturated aqueous solution. Feed the prepared CO2 saturated aqueous solution into the mixing tank C through the pump B, adjust the pH value of the aqueous solution to 7 by adding NaOH4 to the saturated CO2 aqueous solution, mix the oxidized coal 5 and the CO2 aqueous solution, and pass the fully mixed pulp 6 through the pump D Feed into the mixing tank E, and add the flotation agent 7 and the foaming agent 8, the flotation pulp 9 is obtained after the pulp pretreatment, and the flotation pulp 9 is fed into the flotation column F through the pump, and the clean coal 10 is obtained by flotation and tailings11.

[0039] The ratio of CO2 saturated solution, oxidized coal slime, foaming agent and flotation agent is to add 83g of oxidized coal slime, 0.004g of foaming agent and 0.035g of...

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Abstract

The invention discloses a sorting method for oxidized coal slurry. The sorting method comprises the following three parts of the preparation of a CO2 saturated water solution, treatment of oxidized coal slurry ore pulp and sorting of the oxidized coal slurry. The sorting method comprises the following steps of adding a floatation reagent and a foaming agent to the ore pulp; injecting the mixed ore pulp in a flotation column for flotation operation by a pump, wherein the floatation reagent comprises 20-40% of a hydroxyl compound, 1-2% of alkyl phenol polyoxyethylene ether, 1-2% of methyl isobutyl carbinol, 1-2% of xylene, 1-2% of polypropylene ethanediol, 1-2% of sodium silicate, and the balance of hydrocarbon type oil; and enabling coal particles to enter the foam cleaned coal along with the floating of bubbles. According to the sorting method disclosed by the invention, the selection of the technology and the floating agent is optimized, and the recovery rate of the oxidized coal is greatly increased.

Description

technical field [0001] The invention belongs to the field of coal slime separation, and in particular relates to an oxidized coal slime separation method. Background technique [0002] With the improvement of coal mining mechanization in our country, the proportion of coal slime has increased sharply, and the task of coal slime separation has been increasing, and the characteristics of coal slime are "fine, miscellaneous, poor, and difficult". At the same time, coal is oxidized before, during and after mining across the country. Once the coal is oxidized, its buoyancy will decrease rapidly. After the coal is oxidized, the hydrophilic groups on its surface (- The content of OH, -COOH, -CHO) increased rapidly, and the content of hydrophobic groups (alkyl side chains, etc.) decreased sharply, resulting in a continuous decrease in the floatability of coal. At the same time, after the coal is oxidized, its surface becomes loose and the porosity increases, and the porous coal par...

Claims

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Application Information

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IPC IPC(8): B03D1/00B03D1/016B03D101/04
CPCB03D1/00B03D1/016B03D2201/04
Inventor 桂夏辉邢耀文王东岳李臣威李明
Owner CHINA UNIV OF MINING & TECH
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