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Method for intensifying Bayer method seeded precipitation process to produce sandy alumina

A technology of alumina and Bayer method, which is applied in the direction of alumina/hydroxide, etc., can solve the problems of difficult control of product particle size, long decomposition process, and long decomposition time, so as to improve the decomposition rate, reduce the amount of seed crystals, and increase production. The effect of yield

Inactive Publication Date: 2014-01-01
GUIYANG AL-MG DESIGN & RES INST
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Problems solved by technology

[0004] The technical problem to be solved in the present invention is to provide a method for intensifying the seed separation process of the Bayer method to produce sandy alumina, so as to overcome the long decomposition time of sodium aluminate solution in the alumina production process of the Bayer method in the prior art. , low decomposition rate, long decomposition process, a large amount of material accumulation, difficult to control product particle size, etc.

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  • Method for intensifying Bayer method seeded precipitation process to produce sandy alumina

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Experimental program
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Effect test

Embodiment 1

[0027] Simulate the sodium aluminate semen after desilication by Bayer process in industry, and the configuration composition is Na 2 O 181.2 g / L, Al 2 o 3 1 L of sodium aluminate solution with a caustic ratio of 1.57 and a caustic ratio of 190.1 g / L was added with 306 g of aluminum hydroxide seed crystals. Another 40 g of sodium bicarbonate was dissolved in 1 L of water to prepare a 40 g / L aqueous solution of sodium bicarbonate.

[0028] The prepared aqueous sodium bicarbonate solution was added dropwise to the sodium aluminate solution at a rate of 5 ml / min, and this process was carried out in a constant temperature water bath at 60°C. After the dropwise addition is completed, the mixture containing the aluminum hydroxide suspension is separated from solid to liquid, and the obtained aluminum hydroxide coarse crystals are washed with water three times, and then dried in a drying oven at 80° C. for 24 hours to obtain an aluminum hydroxide product. Aluminum hydroxide is ca...

Embodiment 2

[0031] The configuration group is Na 2 O 180.5 g / L, Al 2 o 3 200.6 g / L, 1 L of sodium aluminate solution with a caustic ratio of 1.48, and 306 g of aluminum hydroxide seed crystals were added. Another 40 g of sodium bicarbonate was dissolved in 1 L of water to prepare a 40 g / L aqueous solution of sodium bicarbonate.

[0032] The prepared aqueous sodium bicarbonate solution was added dropwise to the sodium aluminate solution at a rate of 10 ml / min, and this process was carried out in a constant temperature water bath at 60°C. After the dropwise addition is completed, the mixture containing the aluminum hydroxide suspension is separated from solid to liquid, and the obtained aluminum hydroxide coarse crystals are washed with water three times, and then dried in a drying oven at 80° C. for 24 hours to obtain an aluminum hydroxide product. Aluminum hydroxide is calcined at 1050°C for 1 hour to obtain a sandy alumina product with an average particle size of about 90 μm. Decomp...

Embodiment 3

[0034] The configuration group is Na 2 O 179.4 g / L, Al 2 o 3 197.1 g / L, 1 L of sodium aluminate solution with a caustic ratio of 1.5, and 460 g of aluminum hydroxide seed crystals were added. Another 40 g of sodium bicarbonate was dissolved in 1 L of water to make a 40 g / L aqueous solution of sodium bicarbonate.

[0035]The prepared aqueous sodium bicarbonate solution was added dropwise to the sodium aluminate solution at a rate of 5 ml / min, and this process was carried out in a constant temperature water bath at 70°C. After the dropwise addition is completed, the mixture containing the aluminum hydroxide suspension is separated from solid to liquid, and the obtained aluminum hydroxide coarse crystals are washed with water three times, and then dried in a drying oven at 80° C. for 24 hours to obtain an aluminum hydroxide product. Aluminum hydroxide is calcined at 1000°C for 2 hours to obtain a sandy alumina product with an average particle size of about 82 μm. Decompose t...

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Abstract

The invention discloses a method for intensifying a Bayer method seeded precipitation process to produce sandy alumina, and the method comprises (1) adding sodium bicarbonate and aluminum hydroxide crystal seeds into a sodium aluminate solution, stirring for 1-10 hours at 30-100 DEG C to get a suspension containing aluminum hydroxide precipitate; (2) performing solid-liquid separation of the suspension obtained by the step (1) to obtain aluminum hydroxide crystals for partly used as seed crystals, and washing, drying and calcining the other part of the aluminum hydroxide crystals to obtain the sandy alumina; (3) evaporating a seeded precipitation mother solution obtained by the step (2) for separating to obtain sodium carbonate crystals, dissolving the sodium carbonate crystals, guiding in carbon dioxide gas for reaction to generate a sodium bicarbonate solution, and then using the sodium bicarbonate solution in the step (1). Through use of the method, the qualified sandy alumina can be obtained, the problems that the Bayer method in the prior art is long in decomposition time, low in decomposition rate and the like can be solved, the decomposition rate can be improved by more than 5%, the seed crystal addition amount can be greatly reduced, and the aluminum output rate and the decomposing tank unit capacity are improved.

Description

technical field [0001] The invention belongs to the field of light metal metallurgy, and in particular relates to a method for strengthening the Bayer process to produce sandy alumina. Background technique [0002] Because aluminum and its alloys have many excellent properties, and the resources of aluminum are very rich, the aluminum industry has developed very rapidly since its inception, and its current output ranks first among non-ferrous metals, second only to steel. At present, aluminum is mainly derived from alumina, and more than 90% of the global alumina production is used to produce metallic aluminum. Therefore, the alumina industry, as the upstream basic raw material industry of the aluminum industry, is of great significance to the development of the national economy. [0003] The Bayer method is the main method for producing alumina. After more than 100 years of development, the process of producing alumina by the Bayer method has achieved considerable developm...

Claims

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Application Information

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IPC IPC(8): C01F7/02
Inventor 马家玉
Owner GUIYANG AL-MG DESIGN & RES INST
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