Preparation method of coal-based carbon foam from pre-treated bituminous coal

A charcoal foam and pretreatment technology, which is applied in the field of coal-based charcoal foam prepared from pretreated bituminous coal, can solve the problems of insufficient coal cohesion and expansion, decreased compressive strength of charcoal foam, and low compressive strength of charcoal foam. Achieve the effects of low cost, improved compressive strength, and high compressive strength

Active Publication Date: 2013-01-02
UNIV OF SCI & TECH LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] As we all know, the existing strong caking bituminous coal in my country is mainly fat coal and coking coal, and these two kinds of coal are mostly high-ash coal (that is, minerals, generally at 12 % or more), minerals are easy to form crack centers in the carbon foam, which reduces the compressive strength of the carbon foam
In addition, most of the existing strong cohesive bituminous coal is mixed coal, and its cohesiveness is very unstable.
Although the existing high-volatile coal in my cou

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] A dry ash-free gas coal with a volatile content of 39.02% was crushed to 60-80 mesh and set aside. At 25°C, gradually add the analytically pure zinc chloride reagent to the water, stir while adding, so that the zinc chloride is completely dissolved in the water, and measure it with a hydrometer with a range of 1.300-1.360 until the specific gravity reaches 1.350. That is, it is prepared as a zinc chloride flotation liquid for use. Dissolve the pulverized coal and sodium lauryl sulfate in the zinc chloride flotation liquid, stir well to form a coal slurry. The mass ratio of pulverized coal, zinc chloride flotation liquid and sodium lauryl sulfate in the coal slurry is 1000:3000:4. The specific method for the separation and enrichment of coal rock microcomponents is: transfer the prepared coal slurry to the horizontal rotor of the centrifuge, and rotate it at a speed of 4200 rpm for 30 minutes. The coal slurry in the rotor is divided into three layers, the floating matt...

Embodiment 2

[0045] A dry ash-free base volatile content of 28.05% fat coal is crushed to 60-80 mesh. According to the method for preparing the flotation liquid in Example 1, the zinc chloride flotation liquid whose specific gravity is 1.350 is prepared. Dissolve pulverized coal and sodium lauryl sulfate in zinc chloride flotation liquid, stir well, and make coal slurry. The mass ratio of pulverized coal, zinc chloride flotation liquid and sodium lauryl sulfate in the coal slurry is 1000:4000:6. According to the separation and enrichment method of coal rock microcomponents in Example 1, the rich coal vitrinite enrichment was separated and enriched. The fertile coal vitrinite enrichment is used as a raw material, which is transferred to a mold, and then the mold is put into an autoclave. Fill the autoclave with nitrogen to a pressure of 5 MPa, then raise the temperature to 500°C at 2.5°C / min, keep the temperature constant for 2 hours, release the pressure slowly to ambient pressure, and c...

Embodiment 3

[0047] A dry ash-free coking coal with a volatile content of 21.44% was crushed to 60-80 mesh. According to the method for preparing the flotation liquid in Example 1, the zinc chloride flotation liquid whose specific gravity is 1.350 is prepared. Dissolve pulverized coal and sodium lauryl sulfate in zinc chloride flotation liquid, stir well, and make coal slurry. The mass ratio of pulverized coal, zinc chloride flotation liquid and sodium lauryl sulfate in the coal slurry is 1000:2000:2. According to the separation and enrichment method of coal rock microcomponents in Example 1, coking coal vitrinite enrichment was separated and enriched. Using coking coal vitrinite enrichment as raw material, transfer it into a mold, and then put the mold into an autoclave. Fill the autoclave with nitrogen to a pressure of 5 MPa, then raise the temperature to 530°C at 5°C / min, keep the temperature constant for 1 hour, release the pressure slowly to ambient pressure, and cool naturally to r...

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Abstract

The invention discloses a preparation method of coal-based carbon foam from pre-treated bituminous coal, to overcome the shortcomings of high ash content and unstable caking property of bituminous coal. The method comprises the steps of adding pulverized bituminous coal and surfactant into a flotation solution, stirring to obtain coal slurry, transferring into a horizontal rotor of a centrifugal separator to perform maceral separation, taking upper floating matters, washing with water to remove floatation solution, stirring, filtering, drying filter residue at room temperature to obtain enriched vitrinite, and preparing carbon foam from the enriched vitrinite by high-pressure permeation inert gas method or self pressure boosting method. The preparation method has the advantages of simple process flow and low cost, realizes maceral separation and enrichment of bituminous coal, satisfies requirement of coal-based carbon foam preparation for coal caking property and ash content, and widens coal application range. The prepared coal-based carbon foam has the advantages of uniform pore distribution, high compression strength, and adjustable volume density and compression strength.

Description

technical field [0001] The invention relates to a method for preparing coal-based carbon foam, in particular to a method for preparing coal-based carbon foam by using pretreated bituminous coal. Background technique [0002] Carbon foam is a lightweight porous material with a three-dimensional network structure composed of cells and interconnected cell walls. In addition to the conventional properties of carbon materials, carbon foam also has the characteristics of low density, high strength, thermal shock resistance, easy processing, etc., and good physical and chemical properties such as electrical conductivity, thermal conductivity, and wave absorption. These excellent properties make carbon foam have great application potential in many technical fields such as chemical industry, aerospace, and electronics. In recent years, the research on carbon foam materials has received high attention at home and abroad. The content involves the selection and adjustment of new raw ma...

Claims

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Application Information

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IPC IPC(8): C01B31/02C01B31/04C01B32/05C01B32/205
Inventor 徐国忠钟祥云赵振宁赵俊国
Owner UNIV OF SCI & TECH LIAONING
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