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Aluminum oxide production method capable of optimizing process sequence

A production method and alumina technology, which are applied in the preparation of alkali metal aluminate/alumina/aluminum hydroxide, etc., can solve the problem that the concentration of AO in semen is difficult to effectively increase, and achieve convenient production organization, improved productivity, The effect of broad applicability

Inactive Publication Date: 2015-03-04
贵州广铝氧化铝有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is difficult to effectively increase the concentration of semen AO in the steps of traditional methods

Method used

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  • Aluminum oxide production method capable of optimizing process sequence

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) After batching the materials, prepare a slurry, add a sodium hydroxide solution with a mass concentration of 45%, react to dissolve the sodium aluminate slurry, and the temperature of the slurry after the sodium aluminate slurry is dissolved is 85°C;

[0022] (2) The sodium aluminate slurry at 85°C is directly introduced into the multi-effect circulating evaporator to evaporate the mother liquor, and the temperature of the slurry in the evaporator spontaneously drops to 65°C during the evaporation process of the slurry, and the AO concentration is 220g / l Sodium aluminate mother liquor;

[0023] (3) Decomposition: The sodium aluminate mother liquor with an AO concentration of 220 g / l at 65°C is directly subjected to step-by-step cooling of graded carbon, every 5°C is one level, and the temperature is gradually reduced to 45°C, and the decomposed The slurry is finely filtered to obtain aluminum hydroxide and circulating mother liquor; the circulating mother liquor is ...

Embodiment 2

[0028] (1) After batching the materials, prepare a pulp, add a 45% mass concentration sodium hydroxide solution, react to dissolve the sodium aluminate slurry, and the temperature of the slurry after the sodium aluminate slurry is dissolved is 75°C;

[0029] (2) The sodium aluminate slurry at 75°C is directly introduced into the multi-effect circulating evaporator to evaporate the mother liquor, and the temperature of the slurry in the evaporator spontaneously drops to 60°C during the evaporation process of the slurry, and the AO concentration is 210g / l Sodium aluminate mother liquor;

[0030] (3) Decomposition: The sodium aluminate mother liquor with an AO concentration of 210 g / l at 60°C is directly subjected to step-by-step cooling of the graded carbon, with every 5°C as one level, step-by-step cooling and decomposition to 40°C, and the decomposed The slurry is finely filtered to obtain aluminum hydroxide and circulating mother liquor; the circulating mother liquor is evapo...

Embodiment 3

[0035] (1) After batching the materials, prepare a slurry, add a sodium hydroxide solution with a mass concentration of 45%, react and dissolve the sodium aluminate slurry, and the temperature of the slurry after the sodium aluminate slurry is dissolved is 80°C;

[0036] (2) The sodium aluminate slurry at 80°C is directly introduced into the multi-effect circulating evaporator to evaporate the mother liquor, and the temperature of the slurry in the evaporator spontaneously drops to 70°C during the evaporation process of the slurry, and the AO concentration is 205g / l Sodium aluminate mother liquor;

[0037] (3) Decomposition: The sodium aluminate mother liquor with an AO concentration of 205 g / l at 70°C is directly subjected to step-by-step cooling of graded carbon, every 5°C is one level, and the temperature is gradually reduced to 45°C, and the decomposed The slurry is finely filtered to obtain aluminum hydroxide and circulating mother liquor; the circulating mother liquor is...

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Abstract

The invention relates to an aluminum oxide production method capable of optimizing the process sequence, belonging to the technical field of aluminum oxide production. The aluminum oxide production method is characterized by comprising the following processes of preparing a sodium aluminate serous fluid through a traditional technology such as a bayer process or a sintering process; evaporating the sodium aluminate serous fluid directly, wherein the temperature of the sodium aluminate serous fluid is reduced to be 60-70 DEG C in evaporating and is controlled, the sodium aluminate serous fluid is concentrated in AO (anerobic-oxic) concentration so as to obtain 150-220g / l of sodium aluminate serous fluid; then decomposing directly, filtering so as to obtain aluminum hydroxide and circulating mother liquids; concentrating the circulating mother liquid then taking as a circulating ingredient, and dehydrating the aluminum hydroxide so as to obtain aluminum oxide. The original equipment of the production system is used, and the forepart technological processes and technical parameters are not changed. After the prepared sodium aluminate serous fluid is processed in advance, the AO concentration of the seminal fluid is improved, and the temperature is lowered, so that the cycle efficiency is improved, and the energy consumption is lowered. Compared with the existing disclosed technologies, the method can reduce the steam consumption of the system by more than or equal to 5% and the power consumption of the system by more than or equal to 3%, and improve the cycle efficiency by more than or equal to 5%.

Description

technical field [0001] The invention relates to an alumina production method for optimizing flow sequence, which belongs to the technical field of alumina production. Background technique [0002] In the existing public technology of alumina production, the general basic process flow at the present stage is adopted. Most of the processes still in use are Bayer process, and the basic process is: batching - Bayer process pulp - dissolution - semen - decomposition - mother liquor evaporation. There are also very small parts that still use the sintering method. The basic process is: batching - sintering pulp - sintering - dissolution - desiliconization - semen - decomposition - mother liquor evaporation. This standard process flow has the potential to be further optimized to improve efficiency and reduce energy consumption. The desiliconized semen or stripped semen produced by this standard process enters the seed separation or carbon separation process for decomposition to ob...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/14
Inventor 满永国
Owner 贵州广铝氧化铝有限公司
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