Method for extracting aluminium oxide from coal ash and producing cement by using waste slag

A technology of alumina and fly ash, which is applied in the field of reducing environmental pollution of pulverized coal furnaces and comprehensive utilization of fly ash, and extracting aluminum hydroxide or alumina, which can solve the problems of difficult control of cement quality, high cost, and large investment. Achieve the effect of realizing low cost and high added value, reducing the content of sulfur dioxide, and reducing the degree of pollution

Inactive Publication Date: 2007-09-26
CHANGAN UNIV
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Problems solved by technology

[0008] The object of the present invention aims at the problems of large investment, high energy consumption, and high cost in the traditional lime sintering method for extraction of alumina from fly ash and co-production of cement, and seeks ways to reduce investment in extracting al...

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  • Method for extracting aluminium oxide from coal ash and producing cement by using waste slag

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Embodiment Construction

[0036] Below in conjunction with accompanying drawing, the present invention is described in further detail:

[0037]Alumina clinker is obtained by using one furnace for dual purposes. One furnace refers to the pulverized coal thermal boiler, and the dual purpose refers to the pulverized coal boiler producing heat and alumina clinker at the same time. The steam is delivered to heat users. The outstanding progress is that according to the ash content and chemical composition of the coal powder, calcareous raw materials and mineralizers are added to the coal, so that the chemical composition of the alumina clinker obtained after the coal blending mixture is burned (Molar ratio) is: CaO / Al 2 o 3 =0.9-1.1, CaO / SiO 2 =1.6-2.2; the consumption of mineralizer is 0-2% (percentage by weight) of calcareous raw material, this coal blending mixture is fully mixed and ground, and its powder particle size should reach less than 100 μ m, this blending The coal mixture powder is sprayed in...

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Abstract

The invention discloses a method of extracting aluminum oxide from coal ash and preparing cement with waste slag, which comprises the following steps: adopting ''one stove two usage'' craft through coal dust stove of heat power plant; cooling and producing aluminum oxide clinker at the same time; abstracting aluminum oxide to get aluminum oxide product; using waste slag to prepare cement. This invention possesses characterize of reducing the energy consumption of aluminum oxide and cost of production.

Description

technical field [0001] The present invention relates to the field of extracting aluminum hydroxide or aluminum oxide from fly ash, to the field of producing cement from the waste slag after extracting alumina from fly ash, to the field of reducing environmental pollution of pulverized coal furnaces and comprehensive utilization of fly ash, and is especially suitable for use from A method for extracting alumina from fly ash and producing cement from waste residue. Background technique [0002] As we all know, extracting alumina from fly ash can not only increase the value of fly ash utilization, but also solve the problem of fly ash polluting the environment, which is very attractive for the comprehensive utilization of high aluminum fly ash. There are already many methods for extracting alumina from fly ash all over the world. One of the methods that can be industrialized is lime sintering, which is the lime sintering self-pulverization method invented by Polish scientists. ...

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Application Information

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IPC IPC(8): C01F7/02C01F7/30C04B7/02C04B7/28C04B7/43
CPCY02P40/10
Inventor 赵鹏
Owner CHANGAN UNIV
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