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

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...

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 country has a low ash content, the cohesiveness and expansion of the coal are not enough, which is not conducive to the preparation of carbon foams with uniform pore size and open cell-like pore structure, and the carbon foams produced low compressive strength

So far, there has been no report on the method of pretreatment of bituminous coal by separation and enrichment of coal rock microcomponents to improve the expansibility and cohesiveness of existing bituminous coal to prepare coal-based carbon foam