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Method for oxidizing and activating coal gangue through subcritical/supercritical water

A technology of supercritical water oxidation and coal gangue, which is applied in the field of coal gangue activation, can solve the problems of high corrosion resistance of equipment, high energy consumption, and low resource utilization rate, so as to improve oxidation activation efficiency, easy to obtain raw materials, The effect of enhancing the activity

Active Publication Date: 2022-03-29
INNER MONGOLIA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The invention provides a method for oxidizing and activating coal gangue with sub / supercritical water, which is used to overcome the defects in the prior art such as high energy consumption, low utilization rate of resources, generation of a large amount of waste, and high requirements for corrosion resistance of equipment.

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  • Method for oxidizing and activating coal gangue through subcritical/supercritical water
  • Method for oxidizing and activating coal gangue through subcritical/supercritical water
  • Method for oxidizing and activating coal gangue through subcritical/supercritical water

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Embodiment 1

[0044] This embodiment provides a method for oxidizing and activating coal gangue with sub / supercritical water, comprising the following steps:

[0045] S1: Crushing and grinding coal gangue to obtain mineral powder with a particle size of 74 μm;

[0046] S2: Weigh 5% hydrogen peroxide solution and mineral powder at a mass ratio of 1:1.2, and mix them uniformly to obtain an activated precursor.

[0047] S3: The activated precursor was subcritically activated at 320° C. and 8 MPa for 30 minutes, filtered, washed, and dried to obtain activated gangue.

[0048] After activation, most of the carbon and silicon dioxide are exposed, which is beneficial for subsequent extraction and separation.

[0049]For example, use a hydrocyclone to classify the activated coal gangue obtained in this example into an organic liquid phase and a slag phase, and recycle the separated organic liquid phase, and the slag phase is passed through a shaking table to obtain carbon and silicon dioxide Conc...

Embodiment 2

[0054] This embodiment provides a method for oxidizing and activating coal gangue with sub / supercritical water, comprising the following steps:

[0055] S1: Crushing and grinding coal gangue to obtain mineral powder with a particle size of 36 μm;

[0056] S2: Weigh 5% hydrogen peroxide solution and mineral powder at a mass ratio of 1:1.5, and mix them uniformly to obtain an activated precursor.

[0057] S3: Subcritically activate the activated precursor for 30 minutes under the conditions of 250° C. and 20 MPa, filter, wash, and dry to obtain activated coal gangue.

[0058] After activation, most of the carbon and silicon dioxide are exposed, which is beneficial for subsequent extraction and separation.

[0059] For example, use a hydrocyclone to classify the activated coal gangue obtained in this example into an organic liquid phase and a slag phase, and recycle the separated organic liquid phase, and the slag phase is passed through a shaking table to obtain carbon and sili...

Embodiment 3

[0061] This embodiment provides a method for oxidizing and activating coal gangue with sub / supercritical water, comprising the following steps:

[0062] S1: Crushing and grinding coal gangue to obtain mineral powder with a particle size of 2 mm;

[0063] S2: Weigh 5% hydrogen peroxide solution and mineral powder at a mass ratio of 1:1, and mix them uniformly to obtain an activated precursor.

[0064] S3: subcritically activate the activated precursor at 400° C. and 15 MPa for 60 minutes, filter, wash, and dry to obtain activated gangue.

[0065] After activation, most of the carbon and silicon dioxide are exposed, which is beneficial for subsequent extraction and separation.

[0066] For example, use a hydrocyclone to classify the activated coal gangue obtained in this example into an organic liquid phase and a slag phase, and recycle the separated organic liquid phase, and the slag phase is passed through a shaking table to obtain carbon and silicon dioxide Concentrated ore...

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Abstract

The invention discloses a method for oxidizing and activating coal gangue by subcritical / supercritical water, which comprises the following steps: firstly, crushing and grinding the coal gangue to change the granularity and microstructure of minerals in a mechanical manner so as to realize primary separation of the minerals; then a hydrogen peroxide solution is added, hydrogen peroxide is added into the subcritical or supercritical water to serve as an oxidizing agent, the oxidation activation efficiency of the subcritical or supercritical water can be remarkably improved, and raw materials are easy to obtain, green and efficient; and finally, oxidizing and activating under subcritical or supercritical water to reduce the chemical stability of the mineral, and converting the mineral into an amorphous state through crystal transformation to improve the activity. According to the invention, an emerging supercritical hydrothermal activation method is adopted as a main activation method, and subcritical or supercritical water has strong decomposition capability, so that the mineral can be subjected to crystal transformation in a hydrothermal solution. Compared with common thermal activation acid leaching, supercritical activation has the advantages of low reaction temperature, high reaction rate, simple and easy-to-control process and the like.

Description

technical field [0001] The invention relates to the technical field of coal gangue activation, in particular to a method for oxidizing and activating coal gangue with sub / supercritical water. Background technique [0002] my country is the largest coal producer and consumer in the world. Coal gangue is solid waste generated during coal production and processing, and its production volume accounts for 10-25% of coal mining. According to incomplete statistics, the stock of coal gangue in my country has exceeded 7 billion tons over the years. With the increasing development of the coal mining industry, the comprehensive utilization of coal gangue is insufficient, and the amount of stacking is increasing, which brings more environmental problems and brings a series of problems to the surrounding environment. Harm, seriously affect the quality of the surrounding environment. It is imperative to explore the methods of full utilization and high-value utilization of coal gangue, imp...

Claims

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Application Information

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IPC IPC(8): B09B3/00B09B3/35B09B3/70B09B5/00
CPCB09B3/00B09B5/00Y02P20/54
Inventor 李科杜红伟季云飞
Owner INNER MONGOLIA UNIV OF SCI & TECH
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