A Hydrophobic Surface Modification Method for Improving the Flotation Effect of Oxidized Coal Slime

A surface modification and slime flotation technology, which is applied in the surface modification of oxidized coal slime to improve the surface hydrophobicity of oxidized coal slime, can solve the problems of difficult oxidized coal flotation, and achieve the effect of not being easily disturbed by the chemical environment

Active Publication Date: 2018-11-16
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 of the surface of oxidized coal slime, thereby improving the performance of non-polar oil collectors on oxidized coal. Adsorption and spreading effect on mud, solve the problem of difficult oxidized coal flotation

Method used

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  • A Hydrophobic Surface Modification Method for Improving the Flotation Effect of Oxidized Coal Slime
  • A Hydrophobic Surface Modification Method for Improving the Flotation Effect of Oxidized Coal Slime
  • A Hydrophobic Surface Modification Method for Improving the Flotation Effect of Oxidized Coal Slime

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Embodiment 1

[0027] Implement a kind of hydrophobization surface modification method that improves oxidized coal slime flotation effect provided by the present invention above, described hydrophobization surface modification method is to carry out according to the following steps:

[0028] Step 1: Weigh 0.10 g of calcium hydroxide, measure 500 ml of deionized water, place in a beaker and stir for 0.2 h, so that the calcium hydroxide is dissolved in water to form an alkaline calcium hydroxide solution.

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

Embodiment 2

[0036] Implement a kind of hydrophobization surface modification method that improves oxidized coal slime flotation effect provided by the present invention above, described hydrophobization surface modification method is to carry out according to the following steps:

[0037] Step 1: Weigh 0.50 g of calcium hydroxide, measure 500 ml of deionized water, place in a beaker and stir for 3 hours, so that calcium hydroxide is dissolved in water to form an alkaline calcium hydroxide solution.

[0038] In the second step, add 100 g of oxidized coal slime with particle size less than 0.5mm, ash content 26.2wt%, moisture 6.9wt%, volatile matter 23.1wt%, fixed carbon 43.8wt% to the calcium hydroxide solution prepared in the first step, and stir for 2 hours Carry out acid-base neutralization reaction at room temperature to neutralize the acidic functional groups (carboxyl, phenolic hydroxyl) on the surface of oxidized coal slime particles. Thereafter, the formed coal slurry is suction-fi...

Embodiment 3

[0045] Implement a kind of hydrophobization surface modification method that improves oxidized coal slime flotation effect provided by the present invention above, described hydrophobization surface modification method is to carry out according to the following steps:

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

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

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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 modifying the surface of oxidized coal slime, in particular to a method for improving the surface hydrophobicity of oxidized coal slime, which belongs to the technical field of coal washing and processing. Background technique [0002] Flotation is a widely used method for fine-grained mineral separation, and it is also an effective way for coal slime separation. During the coal slime flotation process, the hydrophobic coal particles adhere to the air bubbles, float up with the air bubbles, and enter the foam layer, while the hydrophilic gangue stays in the coal slurry, thereby achieving separation from each other. [0003] Generally, coal is a material with good natural buoyancy, most of which can be obtained by adding oil collectors and foaming agents to obtain excellent separation results. However, because coal is easy to oxidize, after being exposed to the air, it will interact with oxygen and water in the air...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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