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Process for raising producing aluminium oxide circulating efficiency by Bayer process

A cycle efficiency, alumina technology, applied in chemical instruments and methods, alkali metal aluminate/alumina/aluminum hydroxide preparation, alkali metal oxide/hydroxide, etc., can solve the problem of low yield, extraction It can solve the problems of uneconomical agent and low molecular ratio of circulating mother liquor, so as to achieve the effect of increasing production.

Active Publication Date: 2006-06-28
中铝郑州有色金属研究院有限公司
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  • Summary
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AI Technical Summary

Problems solved by technology

(4) Bayer method dissolution has a low output rate due to the low molecular ratio of the circulating mother liquor
For the production of large-scale and cheap products such as alumina, it is economically uneconomical to apply too expensive extraction agents; (2) American technology is suitable for processing relatively dilute sodium hydroxide solutions, and the concentration of stripping solutions is also low
And we need back-extraction to produce high-concentration sodium hydroxide solution, just can reach the requirement of strengthened Bayer process production; (3) the alkylphenol extractant that American document proposes is suitable for the needs of nuclear waste extraction and separation of radioactive cesium, in patent USP3598547, USP3598548 stipulates that the number of carbon atoms in a single side chain of an alkylphenol molecule must not exceed 12. Because the number of carbon atoms in the side chain is small, the water solubility is greater, and because the seed decomposition of the Bayer method is extremely sensitive to organic impurities, the extractant Not applicable

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] with C 8 -C 10 A mixture of fatty alcohols (weight percent C 8 : C 10 =51:49) is extractant, extracts the concentrated Bayer process evaporation mother liquor of 1 volume, and caustic ratio is 2.70, and caustic concentration is 482g / L, and extractant volume is 4 volumes. Extract at 95°C and control the stirring time for 10 minutes. After the reaction is completed, the oil and water are separated. The separated oil phase was poured into the stripping tank and stirred with 1 volume of water for stripping, the temperature was controlled at 95° C., and the stripping time was also controlled at 10 minutes. After the reaction was completed, oil and water were separated. The regenerated extractant is recycled. So cycle. When the caustic alkali concentration of the raffinate is lower than 10mol / L, the extraction is continued after heating and concentrating, and so on. Concentrate twice in the middle process, extract and strip 15 times, and finally, the caustic ratio of t...

Embodiment 2

[0031] Using n-octanol as the extractant, extract 1 volume of the concentrated Bayer method evaporation mother liquor, the caustic ratio is 3.28, the caustic concentration is 499g / L, and 4 volumes of the extractant. Extract at 90°C and control the stirring time at 10 minutes. After the reaction is completed, the oil and water are separated. The separated oil phase was placed in a stripping tank and stirred with 1 volume of water for stripping, the temperature was controlled at 90° C., and the stripping time was also controlled at 10 minutes. After the reaction was completed, oil and water were separated. The regenerated extractant is recycled. So cycle. When the caustic alkali concentration of the raffinate is lower than 10mol / L, the extraction is continued after heating and concentrating, and so on. In the middle process, it was concentrated for 3 times and extracted and stripped 11 times. In the end, the raffinate had a caustic ratio of 1.68, which could decompose the see...

Embodiment 3

[0033] With 0.5mol / L octadecylphenol as extractant, n-octanol-kerosene as diluent, extract 1 volume of Bayer process evaporation mother liquor, caustic ratio is 3.18, caustic concentration is 232g / L, 5 volumes extractant. Extract at 80°C, and control the stirring time at 10 minutes. After the reaction is completed, the oil and water are separated. The separated oil phase was placed in a stripping tank and stirred with 1 volume of water for stripping, the temperature was controlled at 80° C., and the stripping time was also controlled at 10 minutes. After the reaction was completed, oil and water were separated. The regenerated extractant is recycled. This cycle is repeated 4 times, and finally, the raffinate has a caustic ratio of 1.88, which can be used for seed decomposition. The caustic alkali concentration of the stripping water is 115g / L. After analysis, aluminum cannot be detected in the stripping water, indicating that the extraction agent used does not extract alumi...

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PUM

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Abstract

A method for increasing the cyclic efficiency of preparing aluminum oxide by Bayer process includes such steps as extracting sodium hydroxide from the circulated liquid by extractant chosen from n-tutanol, C6-C20 emtrol, C13-C18 alkylphenol, and fluoric alcohol, back extracting by water to obtain concentrated sodium hydroxide solution not containing Al, using it to recover aluminum oxide and caustic alkali from bauxite or red mud, regenerating the extractant for reuse, and using the residual liquid to decompose and prepare aluminum hydroxide.

Description

technical field [0001] A method for improving the recycling efficiency of alumina produced by the Bayer process, involving a liquid-liquid extraction method to extract sodium hydroxide (containing caustic alkalis such as aluminum hydroxide potassium) from the concentrated Bayer process circulating liquid to reduce the evaporation of mother liquor or decomposition The caustic ratio of the mother liquor, thereby enhancing seed decomposition and improving the cycle efficiency and alumina yield of the Bayer process system. technical background [0002] The Bayer process is the main method of alumina production. In this method, the bauxite and the Bayer process circulating liquid containing sodium hydroxide undergo a dissolution reaction under high temperature and high pressure conditions, so that the alumina in the bauxite enters the solution to form a sodium aluminate solution, and then dilute the sodium aluminate solution with red The mud is separated, and the sodium aluminat...

Claims

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Application Information

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IPC IPC(8): C01F7/0606C01F7/144
CPCB01D11/04C01D1/34C01F7/0606C01F7/144
Inventor 顾松青陈念贻刘祥民尹中林陆文聪刘伟张良苗齐利娟白万全李国兵刘万城韩东战
Owner 中铝郑州有色金属研究院有限公司
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