Method for comprehensive utilization of coal gangue

A coal gangue and material technology, which is applied in the field of comprehensive utilization of coal gangue, can solve the problems of using, not being able to use photovoltaic cutting blades, and the quality of silicon carbide is not high

Inactive Publication Date: 2011-09-21
HENAN UNIV OF URBAN CONSTR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to defects in the preparation process, the quality of silicon carbide synthesized using various wastes as raw materials is not high, and the purity is generally below 90%, so it cannot be used as a photovoltaic cutting edge

Method used

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  • Method for comprehensive utilization of coal gangue
  • Method for comprehensive utilization of coal gangue
  • Method for comprehensive utilization of coal gangue

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The steps of preparing polyaluminum chloride:

[0028] (1) Crush and finely grind the gangue to 0.10mm;

[0029] (2) Put the pulverized coal gangue powder in a high-temperature tube furnace, and activate it by pyrolysis at 600°C for 1 hour. A small amount of organic matter in the gangue can not only act as part of the heat source, but also reduce the impact of carbon in the gangue on the extraction of chlorine. The influence of the quality of aluminum;

[0030] (3) The activated coal gangue powder is acid-dissolved with hydrochloric acid at 100°C for 4 hours, the mass ratio of solid to liquid is 1:4, the aluminum in the powder is dissolved in the acid in the form of aluminum chloride, and other traces of iron, calcium, magnesium, etc. The oxide also enters the solution in the form of chloride, and the leaching rate of aluminum chloride is over 90%;

[0031] (4) After solid-liquid separation, the filtrate is matured, hydrolyzed and polymerized, and the basicity is adju...

Embodiment 2

[0042] The steps of preparing polyaluminum chloride:

[0043] (1) Crush and finely grind the gangue to 0.08mm;

[0044] (2) Put the pulverized coal gangue powder in a fluidized fluidized furnace, and activate it by pyrolysis at 650°C for 0.8 hours; a small amount of organic matter in the gangue can not only act as part of the heat source, but also reduce the impact of carbon in the gangue on the quality of aluminum chloride extracted Impact;

[0045] (3) The activated gangue powder is dissolved in hydrochloric acid at 0.4MPa and 145°C for 3 hours, the mass ratio of solid to liquid is 1:4, the aluminum in the powder is dissolved in the acid in the form of aluminum chloride, other trace iron, Oxides such as calcium and magnesium also enter the solution in the form of chloride, and the leaching rate of aluminum chloride is over 90%;

[0046] (4) After solid-liquid separation, the filtrate is matured, hydrolyzed and polymerized, and the basicity is adjusted with calcium aluminat...

Embodiment 3

[0057] The steps of preparing polyaluminum chloride:

[0058] (1) Crush and finely grind the gangue to 0.08mm;

[0059] (2) Put the pulverized coal gangue powder in a high-temperature tube furnace, and activate it by pyrolysis at 800°C for 0.5 hours; a small amount of organic matter in coal gangue can not only act as part of the heat source, but also reduce the impact of carbon in coal gangue on the extraction of chlorine. The influence of the quality of aluminum;

[0060] (3) The activated coal gangue powder is acid-dissolved with hydrochloric acid at 110°C for 1 hour, the mass ratio of solid to liquid is 1:4, the aluminum in the powder is dissolved in the acid in the form of aluminum chloride, and other traces of iron, calcium, magnesium, etc. The oxide also enters the solution in the form of chloride, and the leaching rate of aluminum chloride is over 90%;

[0061] (4) After solid-liquid separation, the filtrate is matured, hydrolyzed and polymerized, and the basicity is ...

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Abstract

The invention relates to a method for comprehensive utilization of coal gangue. The method comprises the following steps: coal gangue crushing, pyrolyzing and activating, acid dissolving, residue filtering for supplying a carbon source, compressing and molding, reacting at a high temperature, crushing to obtain silicon carbide. According to the invention, the method for preparing polyaluminum chloride and photovoltaic cutting edge material-carbonized silicon powder by using the coal gangue is an important approach for effective and comprehensive utilization of the coal gangue.

Description

technical field [0001] The invention belongs to the technical field of coal gangue recovery and utilization, and in particular relates to a method for comprehensive utilization of coal gangue. Background technique [0002] my country has abundant coal resources, and coal gangue is discarded as waste, which not only wastes a lot of resources, occupies a lot of land, but also seriously pollutes the environment. At present, there is a domestic method of preparing polyaluminum chloride from coal gangue, but the remaining slag has not been recycled, and there is still a waste of resources. [0003] For a long time, industrial synthesis of SiC has been using petroleum coke and high-quality silica as the main raw materials. In the late 1980s, SiC was synthesized from anthracite and low-modified bituminous coal, and wastes with Si as the main component, such as coal gangue and natural rice husk, were used to synthesize SiC to reduce costs. However, due to defects in the preparatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/36C02F1/52C01F7/56
Inventor 杜玲枝李洪胡延韶李霞李晓燕邰俊卿张东升
Owner HENAN UNIV OF URBAN CONSTR
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