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Guiding agent for preparing 4A zeolite

A technology of a directing agent and zeolite, which is applied in the field of preparing a directing agent for 4A zeolite, can solve the problems of unsatisfactory crystallized product quality, low crystallinity of 4A zeolite, and reduced material circulation, and achieves low cost, low production cost and good product quality. Effect

Active Publication Date: 2007-11-14
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent 86106033 records a method for preparing 4A zeolite by using the mother liquor of the seed fraction, making full use of the residual Al in the mother liquor of the seed fraction 2 o 3 , to reduce the material circulation in production, the two-stage crystallization method is adopted, and the 4A zeolite product is obtained by adjusting the process conditions. This method is easy to produce large pieces during the slurrying process, and the production cycle is long, generally 8 to 12 hours, and the output The crystallinity of the 4A zeolite is low, only 70-75%, the particle size is dispersed, at 1-10μm, the calcium exchange is low, 280-295mg / g, the Al in the mother liquor 2 o 3 The residue is 16~18g / L, which is still relatively high
Chinese patent 02118924.2 introduces a method of using finely ground finished zeolite as a seed crystal, and borrowing silicon source in sodium aluminate solution to crystallize 4A zeolite. Product quality is not satisfactory

Method used

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Experimental program
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Effect test

Embodiment 1

[0015] The directing agent is formulated with Al 2 o 3 Industrial sodium aluminate solution with a concentration of 55g / L, SiO 2 Water glass and sodium hydroxide with a concentration of 10% by weight are used for batching, the silicon-aluminum ratio is controlled to be 9, the sodium-aluminum ratio is 12, the mixture is evenly mixed, and the preparation is ready for use.

[0016] A method for producing 4A zeolite for washing using sodium aluminate solution in the sintering alumina production process, in Al 2 o 3 Add SiO 2 Water glass with a concentration of 27% by weight, heat the two solutions to 51±1°C respectively, and then press the two solutions to [SiO 2 ] / [Al 2 o 3 ]=1 were respectively added to the slurrying tank, the stirring speed of the slurrying tank was 40 rpm, and after stirring for 5 minutes, the directing agent was added in an amount of 1‰ of the total solution volume, and then the temperature was raised to 93±1°C, crystallized 1 hour, after filtration, w...

Embodiment 2

[0020] The directing agent is formulated with Al 2 o 3 Industrial sodium aluminate solution with a concentration of 40g / L, SiO 2 Water glass and sodium hydroxide with a concentration of 12% by weight are used for batching, and the silicon-aluminum ratio is controlled to be 10, and the sodium-aluminum ratio is 13, and the mixture is evenly mixed and ready for use.

[0021] A method for producing 4A zeolite for washing using sodium aluminate solution in the sintering alumina production process, in Al 2 o 3 Add SiO 2 Water glass with a concentration of 25% by weight, heat the two solutions to 53±1°C respectively, and then press the two solutions to [SiO 2 ] / [Al 2 o 3 ]=1.9 Under synchronous and continuous slurrying, the glue enters the slurrying tank, and then the pulped slurry is pumped into the empty crystallization tank while slurrying, and the stirring speed of the crystallization tank is 40 rpm. Stir for 10 minutes and add the directing agent in an amount of 1‰ of the...

Embodiment 3

[0025] The directing agent is formulated with Al 2 o 3 Industrial sodium aluminate solution with a concentration of 50g / L, SiO 2 Water glass and sodium hydroxide with a concentration of 20% by weight are used for batching, and the silicon-aluminum ratio is controlled to be 9, and the sodium-aluminum ratio is 12, and the mixture is evenly mixed and ready for use.

[0026] A method for producing 4A zeolite for washing using sodium aluminate solution in the sintering alumina production process, in Al 2 o 3 Add SiO 2 Water glass with a concentration of 20% by weight, heat the two solutions to 55±1°C respectively, and then press the two solutions to [SiO 2 ] / [Al 2 o 3 ]=1 Under synchronous continuous slurrying, the gel is formed and enters the slurrying tank, and then the pulped slurry is pumped into the empty crystallization tank while slurrying, and the stirring speed of the crystallization tank is 40 rpm. Stir for 30 minutes and add the directing agent, the amount added i...

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Abstract

A guiding agent for preparing 4A zeolite from the solution of sodium aluminate generated in the production of alumina features that the solution of sodium aluminate, water glass and sodium hydroxide are proportionally mixed while the Si / Al ratio and Na / Al ratio are controlled to be 5-20 and 10-25. Its advantages are high productivity and high quality of 4A zeolite.

Description

technical field [0001] The invention relates to a directing agent for preparing 4A zeolite, which is used for crystallization of zeolite, and is especially suitable for preparing zeolite products from sodium aluminate solution in alumina production by sintering method. Background technique [0002] 4A zeolite can be used in washing industry and catalyst industry. In washing industry, 4A zeolite needs to have a finer particle size, and requires uniform particle size and high calcium exchange performance; in the catalyst industry, 4A zeolite is required to have high crystallinity. and high water absorption. The use requirements are different, and the preparation process is also different. [0003] The production of 4A zeolite for washing mostly adopts chemical synthesis method, mainly using industrial water glass and sodium aluminate solution. Firstly, sodium hydroxide is used to prepare sodium aluminate solution, which is troublesome and expensive. In the industrial process...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/02C01B39/16C01B39/04C01B39/14
Inventor 周岩明王强刘萍孟令利
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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