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Method for producing aluminum oxide with alumyte

A technology of bauxite and alumina, applied in chemical instruments and methods, aluminum compounds, inorganic chemistry, etc., can solve the problems of excessive red mud discharge, difficult to effectively use the active ingredients of red mud, high energy consumption, etc., and achieve reduction Clinker conversion ratio, cost and technical advantages are obvious, and the effect of low firing temperature

Inactive Publication Date: 2011-11-23
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The technical problem to be solved by the present invention is to overcome the defects of high energy consumption, excessive discharge of red mud and difficult effective utilization of active ingredients in red mud existing in the existing sintering method for producing alumina, and to provide a new Using bauxite to produce alumina, this method takes full advantage of the advantages of the sintering method, reduces the clinker conversion ratio and firing temperature, increases the clinker kiln productivity, effectively reduces production costs and significantly reduces red mud emissions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030]1. Calculate according to the 13% iron oxide content contained in bauxite, add reduced coke, and adjust according to 1.1 times of the required theoretical carbon content; then according to [N] / [A]=0.9, [N / [F] =0, [C] / [S-S （石英） ]=2.0 by adding soda ash and limestone for batching to obtain mixed raw meal;

[0031] 2. Grinding with mixed raw materials, the control particle size is d50=30 microns;

[0032] 3. After the mixed raw material is ground, it is added to the kiln for high-temperature firing. During the raw material firing process, the temperature of the firing zone is controlled at 1050 ° C, and the firing zone time is controlled for 1.5 hours;

[0033] 4. Burn the clinker at high temperature for dissolution and separation to obtain a sodium aluminate solution. The dissolution rate of alumina reaches 94%, and the dissolution rate of sodium oxide reaches 97%. At the same time, the red mud is separated by the direct sedimentation method; after testing, the...

Embodiment 2

[0035] 1. Calculate according to 18% of the iron oxide content contained in bauxite, add reduced coke, according to 1.8 times of the required theoretical carbon content; then according to [N] / [A]=1.2, [N / [F] =0.1, [C] / [S-S （石英） ]=2.2 by adding soda ash and limestone for batching to obtain mixed raw meal;

[0036] 2. Grinding with mixed raw materials, the control particle size is d50=100 microns;

[0037] 3. After the mixed raw material is ground, it is added to the kiln for high-temperature firing. During the raw material firing process, the firing zone temperature is controlled at 1150°C, and the firing zone time is controlled at 0.4hr;

[0038] 4. Burn the clinker at high temperature for dissolution and separation to obtain a sodium aluminate solution. The dissolution rate of alumina reaches 95%, and the dissolution rate of sodium oxide reaches 97%. At the same time, the reduction sintering method red mud was separated by the direct sedimentation method; a...

Embodiment 3

[0040] 1. Calculate according to 23% of the iron oxide content contained in bauxite, add reduced coke, according to 1.4 times of the required theoretical carbon content; then according to [N] / [A]=1.0, [N / [F] =0, [C] / [S-S （石英） ]=2.1, add soda ash, evaporated mother liquor, and limestone for batching to obtain mixed raw meal;

[0041] 2. Grinding with mixed raw materials, the control particle size is d50=120 microns;

[0042] 3. After the mixed raw material is ground, it is added to the kiln for high-temperature firing. During the raw material firing process, the firing zone temperature is controlled at 1100 ° C, and the firing zone time is controlled for 1.0 hr;

[0043] 4. Burn the clinker at high temperature for dissolution and separation to obtain a sodium aluminate solution. The dissolution rate of alumina reaches 93%, and the dissolution rate of sodium oxide reaches 95%. At the same time, the reduction sintering method red mud was separated by the direct...

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Abstract

The invention discloses a method for producing aluminum oxide with alumyte. The method comprises the following steps of: (1) smashing alumyte, adding a reduction aid, calcined soda and lime stone and blending to obtain a mixed green stock; (2) performing milling grinding on the mixed green stock and adding the mixed green stock into a furnace for performing hard fire; (3) dissolving and separating hard fire clinker out to obtain a sodium aluminate solution, and separating red mud from the hard fire clinker by adopting a direct sedimentation method; and (4) purifying the sodium aluminate solution, decomposing and separating aluminum hydrate out, and discharging the red mud. Due to the adoption of the method, the reduced ratio of the clinker is remarkably lowered, the productivity of a clinker kiln is increased, the production cost is greatly lowered, and the discharging amount of red mud is reduced by over 50 percent. The method has the advantages of lower firing temperature and low dissolution rate of silicon, and is particularly suitable for treating ferric alumyte or treating complex polymetallic bauxite; and the siliceous modulus of raw liquor is increased remarkably.

Description

technical field [0001] The invention relates to a method for producing alumina, in particular to a method for producing alumina by using bauxite, and belongs to the field of alumina production. Background technique [0002] To evaluate the quality of bauxite depends not only on its chemical composition and the ratio of aluminum to silicon, but also on the type of bauxite. The content of alumina, the useful ingredient in bauxite, is generally between 45% and 75%. Compared with other non-ferrous metal ores, bauxite is a rich ore. Silica in bauxite is the most harmful impurity in the subtractive production of alumina. The weight ratio of alumina to silica in bauxite is called the aluminum-silicon ratio of bauxite, expressed by the symbol A / S. The higher the aluminum-silicon ratio, the less silica content in the ore. Alumina production requires the higher the aluminum-silicon ratio of bauxite and the alumina content, the better. These two indicators have a great impact on th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/20
Inventor 高建阳鹿中科周晓燕冯柳薛忠秀陈玉海郑霞
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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