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Method for producing aluminum oxide by sintering process

A kind of technology of alumina and sintering method, which is applied in the direction of alumina/hydroxide, etc., can solve the problems of unfavorable alumina production cost, enhance market competitiveness, lime highlighting, etc., and achieve the effect of high cost, convenient transportation and less impurities

Inactive Publication Date: 2014-01-01
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with the rise in the price of raw materials, the proportion of lime in the production cost of alumina has become increasingly prominent, which is not conducive to reducing the production cost of sintered alumina and enhancing market competitiveness

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] 1. Grind calcium carbide slag with a moisture content of 15% and an effective calcium oxide content of 75% with bauxite, anthracite, and alkali powder respectively, and pass through a 100# sieve after grinding.

[0017] 2. Fully mix the ground carbide slag, bauxite, anthracite and alkali powder according to the determined alkali ratio and calcium ratio.

[0018] 3. After the qualified raw meal is sintered at 1180-1220°C for 40 minutes, it is cooled naturally. The cooled clinker is ground and passed through a 60# sieve.

[0019] 4. Grind the clinker according to the determined Al 2 o 3 The dissolution rate was added to the adjustment liquid, stirred and dissolved at 85°C for 30 minutes, and then separated by solid-liquid sedimentation to obtain crude liquid and red mud respectively.

[0020] 5. Add calcium carbide slag milk with solid content ≥ 210g / l and available calcium oxide ≥ 150g / l to the primary desiliconization solution according to the effective calcium oxide...

Embodiment 2

[0022] 1. Grind calcium carbide slag with a moisture content of 15% and an effective calcium oxide content of 65% with bauxite, anthracite, and alkali powder respectively, and pass through a 100# sieve after grinding.

[0023] 2. Fully mix the ground carbide slag, bauxite, anthracite and alkali powder according to the determined alkali ratio and calcium ratio.

[0024] 3. After the qualified raw meal is sintered at 1180-1220°C for 40 minutes, it is cooled naturally. The cooled clinker is ground and passed through a 60# sieve.

[0025] 4. Grind the clinker according to the determined Al 2 o 3 The dissolution rate was added to the adjustment liquid, stirred and dissolved at 85°C for 30 minutes, and then separated by solid-liquid sedimentation to obtain crude liquid and red mud respectively.

[0026] 5. Add calcium carbide slag milk with solid content ≥ 210g / l and available calcium oxide ≥ 150g / l to the primary desiliconization solution according to the effective calcium oxide...

Embodiment 3

[0028] 1. Grind calcium carbide slag with a moisture content of 40% and an effective calcium oxide content of 65% with bauxite, anthracite, and alkali powder respectively, and pass through a 100# sieve after grinding.

[0029] 2. Fully mix the ground carbide slag, bauxite, anthracite and alkali powder according to the determined alkali ratio and calcium ratio.

[0030] 3. After the qualified raw meal is sintered at 1180-1220°C for 40 minutes, it is cooled naturally. The cooled clinker is ground and passed through a 60# sieve.

[0031] 4. Grind the clinker according to the determined Al 2 o 3 The dissolution rate was added to the adjustment liquid, stirred and dissolved at 85°C for 30 minutes, and then separated by solid-liquid sedimentation to obtain crude liquid and red mud respectively.

[0032] 5. Add calcium carbide slag milk with solid content ≥ 210g / l and available calcium oxide ≥ 150g / l to the primary desiliconization solution according to the effective calcium oxide...

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PUM

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Abstract

The invention discloses a method for producing aluminum oxide by a sintering process and relates to an improvement of a clinker sintering and concentrate desilicication process in a process of producing aluminum oxide by the sintering process. The method is characterized by comprising the following steps: (1) mixing carbide slag with bauxite, anthracite and sodium carbonate, and grinding into raw slurry; (2) mixing the carbide slag with aluminum hydroxide washing liquor or hot water to prepare an carbide slag emulsion, mixing the carbide slag emulsion with primary desilicication liquid for reaction, carrying out solid-liquid settling separation on the slurry after reaction, and filtering to obtain concentrate and silicon slag, wherein the concentrate is used for producing aluminum oxide and the silicon slag is conveyed back to a rotary kiln for mixing and sintering. According to the method, effective calcium oxide in the carbide slag is utilized and the problems of the pollution of the carbide slag on an environment and high energy consumption, high cost and the like of lime for producing aluminum oxide by the sintering process are effectively solved according to the characteristics that the carbide slag is low in impurity content, low in water content and convenient to transport.

Description

technical field [0001] The invention discloses a method for producing alumina by sintering, and relates to an improvement of clinker sintering and semen desiliconization processes in the process of producing alumina by sintering. Background technique [0002] Carbide slag is the waste residue with calcium hydroxide as the main component produced after the hydrolysis of calcium carbide to obtain acetylene gas. Carbide (CaC 2 ) as raw material, the process of producing acetylene by adding water currently accounts for a large proportion in our country. Industrially, acetylene is the main raw material for the production of polyvinyl chloride resin (PVC). According to statistics, 1.5 to 1.6 tons of calcium carbide is consumed for producing 1 ton of PVC products, and at the same time, 1.2 tons of calcium carbide slag (dry basis) is produced per ton of calcium carbide. Long-term accumulation not only occupies A large amount of land, and has a serious erosive effect on the land. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02
Inventor 冯承志卫星武福运李烽克王永平杜煜续宗俊
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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