Sandy alumina preparation method

A technology of aluminum oxide and aluminum hydroxide, applied in the field of light metal metallurgy, can solve the problem of inability to circulate in the preparation process, and achieve the effects of shortened decomposition time, good fluidity and uniform particle distribution

Inactive Publication Date: 2010-07-28
INST OF PROCESS ENG CHINESE ACAD OF SCI
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Problems solved by technology

[0005] Although the research on the preparation of sandy alumina has been carried out for many years, the existing preparation process needs to add seeds, and the preparation process cannot be recycled. Therefore, in order to overcome the above problems, the present invention proposes a method for preparing sandy alumina The new method is of great significance to my country's alumina industry

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Embodiment 1

[0030] Evaporate the sodium aluminate semen after desilication in industrial alumina production to the composition: Na 2 O180g / L, Al 2 o 3 211.5g / L, molar ratio 1.4. Get sodium bicarbonate 50g and dissolve in the deionized water of 1000mL, obtain the aqueous solution of the sodium bicarbonate of 50g / L.

[0031] Add sodium bicarbonate aqueous solution to the sodium aluminate semen dropwise at a rate of 1 mL / min. This process is carried out in a constant temperature water bath at 80°C. After the reaction is completed, the solid-liquid mixture is separated, and the solid phase is washed with water until the washing liquid is Neutral, dry at 80°C for 24 hours to obtain aluminum hydroxide product, and calcinate aluminum hydroxide at 1000°C for 2 hours to obtain sandy alumina product. The main component of decomposition mother liquor is sodium carbonate, this decomposition mother liquor is at 40 ℃, reacts with carbon dioxide gas for 2 hours, and sodium carbonate is converted into...

Embodiment 2

[0034] 50g / L aqueous sodium bicarbonate solution is added dropwise to the sodium aluminate solution at a rate of 1mL / min, the composition of the sodium aluminate solution is: Na 2 O 178.25g / L, Al 2 o3 195.5g / L, molar ratio 1.5, the process is carried out in a constant temperature water bath at 70°C, after the reaction, the solid-liquid mixture is separated, the solid phase is washed with water until the washing liquid is neutral, and dried at 80°C for 12 hours to obtain The aluminum hydroxide crystal product is calcined at 1000° C. for 2 hours to obtain a sandy alumina product. The average particle size of the alumina product in this method is 95 μm. The decomposed mother liquor reacts with carbon dioxide gas to obtain a sodium bicarbonate solution again, which is used as a raw material for preparing the sandy alumina of the present invention.

Embodiment 3

[0036] Add 100g / L aqueous sodium bicarbonate solution dropwise to the sodium aluminate solution at a rate of 1mL / min, the composition of the sodium aluminate solution is: Na 2 O 178.25g / L, Al 2 o 3 210.5g / L, molar ratio 1.4, the process is carried out in a constant temperature water bath at 60°C. After the reaction, the solid-liquid mixture is separated, the solid phase is washed with water until the washing liquid is neutral, and dried at 80°C for 24 hours to obtain The aluminum hydroxide product is calcined at 1000° C. for 2 hours to obtain a sandy alumina product, and the particle size of the alumina product in this method is 88 μm. The decomposed mother liquor reacts with carbon dioxide gas to obtain a sodium bicarbonate solution again, which is used as a raw material for preparing the sandy alumina of the present invention.

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Abstract

The invention provides a sandy alumina preparation method which includes the following steps: a. sodium bicarbonate is added to sodium aluminate solution and is stirred for 10 minutes-4 hours at the temperature of 30-90 DEG C to obtain aluminum hydroxide solid suspension; b. Aluminum hydroxide solid suspension receives solid-liquid separation to respectively collect solid phase and liquid phase, the solid phase is calcined to obtain sandy alumina; c. carbon oxide gas is introduced to the liquid phase obtained in step b to produce sodium bicarbonate solution, and then the sodium bicarbonate solution is used for the steps a. the sandy alumina preparation method can prepare qualified sandy alumina products; the decomposition time of sodium aluminate solution is greatly reduced; seed crystals have no need to be added to the system and the aluminum recovery rate is greatly improved; In addition, the carbon dioxide gas is adopted to realize the regeneration of sodium bicarbonate for the recycling of sodium bicarbonate.

Description

technical field [0001] The invention relates to a method for preparing sandy alumina from sodium aluminate solution by using sodium bicarbonate, belonging to the field of light metal metallurgy. Background technique [0002] Among the proven bauxite reserves in China, diaspore reserves account for 98.46% of the total bauxite reserves, and most of the diaspore-type bauxite has the outstanding characteristics of high aluminum, high silicon and low iron. Therefore, the sintering method is an important method for producing alumina from diaspore. At present, the production of alumina produced by sintering method (including the sintering method system in the combined method) accounts for about 40% of the total domestic alumina production. Therefore, the production of alumina by sintering method occupies a very important position in my country's alumina industry. In the traditional sintering method, the decomposition of sodium aluminate solution is realized by introducing carbon d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/14
Inventor 张亦飞李艳杨超张懿
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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