A method for strengthening the species of supersaturated sodium aluminate solution

A sodium aluminate and solution technology, applied in the field of aluminum metallurgy, can solve the problems of difficult separation of methanol and sodium aluminate solution, influence of alumina production, difficulty in production organization, etc. The effect of organizing production

Active Publication Date: 2017-04-12
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese Patent Publication No. CN 101654272A, published on February 24, 2010, the name of the invention is a new method for the decomposition of sodium aluminate solution, adding 10 to 100% water, although the decomposition rate can be significantly improved, but a large amount of diluted solution will cause steam Consumption is significantly increased, and production organization is difficult; Chinese Patent Publication No. CN101746794A, published on June 23, 2010, the name of the invention is a method for preparing high caustic ratio sodium aluminate solution from a low caustic rat

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  • A method for strengthening the species of supersaturated sodium aluminate solution

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Embodiment 1

[0030] A method for strengthening the species of supersaturated sodium aluminate solution of the present invention, such as figure 1 As shown, using supersaturated sodium aluminate solution as raw material (such as the sodium aluminate solution obtained after processing boehmite or boehmite by Bayer method), control the solution concentration Na 2 O (caustic)=162g / L, Al 2 o 3 =183.2g / L. Take 50ml supersaturated sodium aluminate solution, add 50ml sodium bicarbonate suspension (NaHCO 3 45g / L), reacted under strong stirring conditions at 30°C for 60min, precipitated aluminum hydroxide, and obtained active aluminum hydroxide seed crystal slurry. Add 950ml of supersaturated sodium aluminate solution to the seeding tank, add active aluminum hydroxide seed slurry under stirring conditions, and add 20ml of 28% ammonia water, control the initial temperature of seeding at 55°C, start seeding, control The final temperature of seed separation is 45°C, and after 40 hours of seed sepa...

Embodiment 2

[0033] Take supersaturated sodium aluminate solution 1000mL, control solution concentration Na 2 O=165g / L,Al 2 o 3 =183.2g / L, Na 2 o c (sodium carbonate) = 13.5g / L. Add 300g / L aluminum hydroxide as a seed crystal, then add 10mL of 28% ammonia water, control the temperature of the seed separation at 60°C, lower the temperature to decompose, the final temperature of the seed separation is 45°C, decompose for 45 hours, filter the seed separation slurry, and the decomposition rate is 64% . In the process of seed separation and filtration, ammonia gas is recovered with water to obtain ammonia water for reuse.

Embodiment 3

[0035] A method for intensifying seed classification of supersaturated sodium aluminate solution of the present invention, using supersaturated sodium aluminate solution as raw material (such as sodium aluminate solution for seed classification obtained by processing gibbsite by Bayer method), and controlling the concentration of the solution Na 2 O=135g / L,Al 2 o 3 =153.7g / L. Take 30ml of supersaturated sodium aluminate solution, add 10ml of 30% hydrogen peroxide, and react under strong stirring at 40°C for 60 minutes to precipitate aluminum hydroxide and obtain active aluminum hydroxide seed slurry. Add 950ml of supersaturated sodium aluminate solution into the seeding tank, control the initial temperature of seeding at 50°C; add active aluminum hydroxide seed slurry under stirring conditions, and feed ammonia gas to maintain the pressure at 0.1kg / cm 2 , Start seeding, control the end temperature of seeding at 45°C, after 35 hours of seeding, the decomposition rate is 76%....

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Abstract

The invention discloses a method for reinforcing seed decomposition of a supersaturated sodium aluminate solution. The supersaturated sodium aluminate solution is added to a seed decomposition tank, the initial temperature for seed decomposition is set, a crystal seed fluid is added while stirred, an additive is added, seed decomposition is performed with a cooling system, crystal seed decomposition is started, the end temperature for seed decomposition is controlled, solid-liquid separation is performed, and aluminum hydroxide is obtained; meanwhile, the additive is recovered in the seed decomposition and solid-liquid separation processes. The decomposition rate is high, the circulation efficiency and the equipment productivity are improved, and the circulation volume and the production cost are reduced; the additive is cheap and easy to obtain, and accordingly, the production cost is reduced; the additive is easy to separate in alkali, ammonia gas is easily absorbed by water, later recovery during decomposition is facilitated, on one hand, loss of the additive is reduced, influence on production of aluminum oxide is reduced, on the other hand, influence on the environment is reduced, recycling is facilitated, adding is convenient, the production cost is reduced, and production organization is facilitated; the technology is simple, and industrial implementation is facilitated.

Description

technical field [0001] The invention relates to the technical field of aluminum metallurgy, in particular to a method for strengthening the species of a supersaturated sodium aluminate solution. Background technique [0002] The supersaturated sodium aluminate solution has good metastability, and the addition of seed crystals can destroy its metastability, thereby promoting the precipitation of aluminum hydroxide from the sodium aluminate solution. This process is called seed crystal decomposition, also known as seed separation. The low decomposition rate of seeds has always been the crux of low equipment productivity and high production costs. For this reason, methods such as increasing the amount of seeds, adding organic additives, adding active crystal seeds, reducing the temperature at the end of seed classification, or adding external fields have been proposed successively at home and abroad. Among these methods, although some can increase the seeding rate, the rate of...

Claims

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Application Information

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IPC IPC(8): C01F7/14
Inventor 刘桂华李小斌齐天贵彭志宏周秋生陈威
Owner CENT SOUTH UNIV
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