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Preparation method for clinker of alumina produced by sintering process

A technology of alumina and sintering method, applied in alumina/aluminum hydroxide and other directions, can solve the problems of low heat utilization rate, high energy consumption and poor economy of clinker kiln

Inactive Publication Date: 2016-05-04
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the low heat utilization rate of the clinker kiln, the energy consumption required for drying raw meal is high, accounting for about 40% of the burning energy consumption
As a result, the energy consumption of the sintering method is as high as 3.5 to 4 times that of the Bayer method, and the economy is poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The aluminum-containing raw material is the Bayer process alkali red mud of an alumina plant in Shanxi, with A / S=1.34. After dehydration by the plate and frame filter press, the mud cake has a liquid content of 29.4%, and the temperature is 860°C. After drying by the dry crusher, the content of attached liquid is 0.81%, and the ingredients are homogenized quantitatively according to the calcium ratio of 1.95 and the alkali ratio of 0.94, and then formed into balls through a disc. The water content of the pellets is 9.8%, and then preheated to 795 ℃ into the kiln for sintering, and after cooling, clinker with a temperature of 82 ℃ is obtained for standard dissolution. Dissolution rate η A and η N They are 92.1% and 93.5% respectively, the heat consumption of clinker firing is 139kgec / t, and the output of clinker kiln is increased by 61%.

Embodiment 2

[0028] The aluminum-containing raw material is Bayer process alkali red mud from an alumina plant in Shanxi. Its A / S=1.38. After being dehydrated by a plate and frame filter press, the mud cake has a liquid content of 31.1%. The temperature used is 900°C. After drying by the dry crusher, the content of attached liquid is 0.68%, and the ingredients are homogenized quantitatively according to the calcium ratio of 2.0 and the alkali ratio of 0.96, and then passed through a disc to form a ball. The water content of the pellets is 8.0%, and then preheated to 826 ℃ into the kiln for sintering, and after cooling, the clinker with a temperature of 80 ℃ is obtained for standard dissolution. Dissolution rate η A and η N They are 93.2% and 94.6% respectively, the heat consumption of clinker firing is 135kgec / t, and the output of clinker kiln is increased by 68%.

Embodiment 3

[0030] The aluminum-containing raw material is Bayer process red mud from an alumina plant in Shanxi, mixed with some bauxite, its A / S=1.45, after dehydration by plate and frame filter press, the mud cake has a liquid content of 31.1%, and the temperature used is 900°C After the kiln tail flue gas is dried by the drying crusher, the attached liquid content is 0.68%, and the quantitative ingredients are homogenized according to the calcium ratio of 1.98 and the alkali ratio of 0.94. The grate machine is preheated to 826°C and put into the kiln for sintering. After cooling, the clinker with a temperature of 80°C is obtained for standard dissolution. Dissolution rate η A and η N They are 93.2% and 94.6% respectively, the heat consumption of clinker firing is 132kgec / t, and the output of clinker kiln is increased by 68%.

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Abstract

The invention discloses a preparation method for a clinker of alumina produced by a sintering process, and relates to an improvement on the process of producing alumina by the sintering process. The preparation method is characterized in that according to the preparation process of the preparation method, Bayer alkali red mud powder, lime, bauxite, soda ash and pulverized coal are mixed uniformly to be raw material pellets, and the raw material pellets are sintered to obtain the clinker of the alumina produced by the sintering process. A dry-process sintering method of the sintering process disclosed by the invention can be used in the process of producing alumina by a mixed combination process and a series process, the process disclosed by the invention has stable clinker quality, reduced clinker sintering energy consumption by more than 40%, and increased clinker kiln production capacity by more than 60% in comparison with the existing alumina production process, thereby having the effect of saving energy and reducing consumption in a large extent.

Description

technical field [0001] The invention discloses a clinker preparation method for producing alumina by a sintering method, and relates to an improvement of a process for producing alumina by a sintering method. Background technique [0002] The soda lime sintering method is the most effective method for processing low-grade bauxite to produce alumina. It has the characteristics of high recovery rate of alumina and low alkali content in red mud. Generally, the recovery rate of alumina can reach more than 90%. Sodium content is less than 2%. [0003] The existing sintering method uses a wet method to grind the raw slurry, and the moisture of the raw slurry is generally 35% to 42%, which needs to be removed in the drying zone of the wet long kiln. Due to the low heat utilization rate of the clinker kiln, the energy consumption required for drying raw meal is high, accounting for about 40% of the energy consumption for firing. As a result, the energy consumption of the sintering...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02
CPCC01F7/02
Inventor 刘伟樊大林杨志民
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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