Method for extracting aluminum hydrate or alumina from coal gangue and method for producing cement from fag end

A technology of aluminum hydroxide and alumina, which is applied in alumina/hydroxide preparation, cement production and other directions, can solve the problems of high energy consumption and uneconomical, high calcination temperature and high process energy consumption, and achieve the effect of reducing production costs.

Inactive Publication Date: 2007-09-05
CHANGAN UNIV
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Problems solved by technology

[0005] The lime method is a technology invented by Polish scientists to extract alumina from fly ash and co-produce cement. Due to the high temperature of clinker calcination in this method, the energy consumption of the whole process is high.
[0006] The extraction of alumi

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  • Method for extracting aluminum hydrate or alumina from coal gangue and method for producing cement from fag end

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Embodiment Construction

[0023] Below in conjunction with accompanying drawing, the present invention is described in further detail:

[0024] Firstly, after the coal gangue with an alumina content greater than 30% (weight percent) is pulverized and calcined into metakaolin, it is ball milled and mixed with calcined calcium oxide or carbide slag at a ratio of 1: (1-3). The ratio is 1: (0.1-1) and the ratio is 1: (0.1-1) and water is added to form it and then sent to the autoclave for autoclaving reaction. The autoclave reaction can be steam heating or self-autoclaving. The pressure is 0.14-6.4MPa. The autoclaving time is 0.5-12 hours, the heat energy in the autoclaving process is obtained by calcining coal gangue, and the product obtained after autoclaving is autoclaved material.

[0025] Secondly, the autoclaved material is calcined, the calcining temperature is 800-1000° C., and the calcining time is 0.5-12 hours. Calcination equipment can be tunnel kiln for ceramic production process, rotary kiln...

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Abstract

A process for extracting aluminum hydroxide (or oxide) from coal gangue and using the residual dregs to prepare cement includes such steps as calcining coal gangue, mixing with lime or calcium carbide dregs and water, steam pressure reaction to generate the resultant containing hydrated calcium silicoaluminate and calcium hydroxide, calcining to obtain the dodecylcalcium hepatoaluminate and dicalcium silicate, extracting in sodium carbonate solution, adding lime for desiliconizing, carbonizing to obtain aluminum oxide, calcining to obtain aluminum oxide, and using the SiCa dregs to prepare cement.

Description

technical field [0001] The present invention relates to a method for extracting aluminum hydroxide or aluminum oxide, in particular to a method for extracting aluminum hydroxide or aluminum oxide from coal gangue, and the present invention also relates to a method for extracting aluminum hydroxide or aluminum oxide from coal gangue A method of producing cement from waste residue. Background technique [0002] The extraction of alumina from coal gangue and the co-production of cement already have many patents at home and abroad. [0003] The methods of extracting alumina from coal gangue at home and abroad can be divided into two categories: alkaline method and acid method. Due to the shortcomings of the acid method in the industry such as corrosion of equipment, difficult recovery of acid, and difficult removal of other technical metal impurities, the promotion of industrialization is still limited. [0004] Most of the alkaline process is adding soda ash to coal gangue fo...

Claims

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Application Information

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IPC IPC(8): C01F7/30C04B7/24
CPCY02P40/10
Inventor 赵鹏姜修道王尉和
Owner CHANGAN UNIV
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