Hydrophobic surface modification method for improving flotation effect of oxidized coal slime

A surface modification and coal slime flotation technology is applied in the field of improving the surface hydrophobicity of oxidized coal slime and surface modification of oxidized coal slime.

Active Publication Date: 2017-09-19
TAIYUAN UNIV OF 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 use the combined agent to carry out grafting reaction on the carboxyl group and phenolic hydroxyl group on the surface of oxidized coal to improve the hydrophobicity

Method used

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  • Hydrophobic surface modification method for improving flotation effect of oxidized coal slime
  • Hydrophobic surface modification method for improving flotation effect of oxidized coal slime
  • Hydrophobic surface modification method for improving flotation effect of oxidized coal slime

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Embodiment 1

[0027] To implement a hydrophobic surface modification method for improving the flotation effect of oxidized slime provided by the present invention, the hydrophobic surface modification method is carried out according to the following steps:

[0028] The first step is to weigh out 0.10 g of calcium hydroxide, weigh out 500 ml of deionized water, and place it in a beaker for stirring for 0.2 hours to dissolve the calcium hydroxide in the water to form an alkaline calcium hydroxide solution.

[0029] In the second step, 100g of oxidized coal slime with particle size less than 0.5mm, ash content of 20.1wt%, moisture content of 6.1wt%, volatile content of 8.4wt%, and fixed carbon of 65.4wt% were added to the calcium hydroxide solution prepared in the first step, and stirred for 0.5 h Perform acid-base neutralization reaction at room temperature to neutralize acidic functional groups (carboxyl groups, phenolic hydroxyl groups) on the surface of oxidized coal slime particles. Afterwards...

Embodiment 2

[0036] To implement a hydrophobic surface modification method for improving the flotation effect of oxidized slime provided by the present invention, the hydrophobic surface modification method is carried out according to the following steps:

[0037] The first step is to weigh 0.50 g of calcium hydroxide, measure 500 ml of deionized water, place it in a beaker and stir for 3 hours to dissolve the calcium hydroxide in the water to form an alkaline calcium hydroxide solution.

[0038] In the second step, 100g of oxidized coal slime with particle size less than 0.5mm, ash content of 26.2wt%, moisture content of 6.9wt%, volatile content of 23.1wt%, and fixed carbon of 43.8wt% were added to the calcium hydroxide solution prepared in the first step, and stirred for 2h A room temperature acid-base neutralization reaction is carried out to neutralize the acidic functional groups (carboxyl groups, phenolic hydroxyl groups) on the surface of oxidized coal slime particles. Afterwards, the fo...

Embodiment 3

[0045] To implement a hydrophobic surface modification method for improving the flotation effect of oxidized slime provided by the present invention, the hydrophobic surface modification method is carried out according to the following steps:

[0046] The first step: Weigh 0.33 g of calcium hydroxide, measure 500 ml of deionized water, place it in a beaker and stir for 1 hour to dissolve the calcium hydroxide in the water to form an alkaline calcium hydroxide solution.

[0047] Step 2: Add 100g of oxidized coal slime with particle size less than 0.5mm, 24.7wt% ash, 8.2wt% moisture, 17.1wt% volatile content, and 50.0wt% fixed carbon to the calcium hydroxide solution prepared in the first step, and stir for 2h A room temperature acid-base neutralization reaction is carried out to neutralize the acidic functional groups (carboxyl groups, phenolic hydroxyl groups) on the surface of oxidized coal slime particles. Afterwards, the formed coal slurry is suction filtered by a suction filter...

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Abstract

The invention discloses a hydrophobic surface modification method for improving a flotation effect of oxidized coal slime. The method comprises the following steps: calcium hydroxide is added in water for stirring to form alkaline calcium hydroxide solution; the oxidized coal slime is added in the calcium hydroxide solution to stir for neutralization reaction, and is filtered and dried to prepare an acid-alkali neutralization oxidized coal slime filter cake; organic carboxylic acid is added with water for dissolving, stirring and heating; and the acid-alkali neutralization oxidized coal slime filter cake is added in the organic carboxylic acid to stir at normal temperature for grafting reaction, and is filtered and dried to prepare hydrophobic modified oxidized coal slime filter cake. The method uses a chemical complexing method for grafting hydrophobic chain sections onto acid hydrophilic functional groups on the surfaces of coals, is not easy to be influenced by the flotation solution chemical environment, is firm in combination, preferably improves the problem of weak surface hydrophobicity of the oxidized coal slime, and can improve the flotation and recovery rates of cleaned coals.

Description

Technical field [0001] The invention relates to a method for surface modification of oxidized coal slime, in particular to a method for improving the hydrophobicity of the surface of oxidized coal slime, and belongs to the technical field of coal washing and processing. Background technique [0002] Flotation is a widely used method for the separation of fine-grained minerals, and it is also an effective way for coal slime separation. In the process of coal slime flotation, the hydrophobic coal particles adhere to the bubbles, float up with the bubbles, and enter the foam layer, while the hydrophilic gangue remains in the coal slurry to achieve separation from each other. [0003] Generally, coal is a naturally buoyant material, and most of them can obtain excellent separation effects by adding oil collectors and foaming agents. However, because coal is easy to oxidize, after being exposed to the air, it will interact with oxygen and water in the air, resulting in varying degrees ...

Claims

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Application Information

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IPC IPC(8): B03B1/04
CPCB03B1/04
Inventor 张志强康倩楠韵涛
Owner TAIYUAN UNIV OF TECH
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