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Method for improving stability of sodium aluminate solution

A sodium aluminate, stability technology, applied in the field of stabilization of sodium aluminate solution, can solve the problem of prolonged storage of sodium aluminate solution

Active Publication Date: 2020-06-02
CHEM TECH ACAD OF SHANDONG PROVINCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With different precipitant treatment methods and addition amounts, the sodium aluminate solution was left for 12-24 months without precipitation.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The ordinary sodium aluminate solution with a caustic ratio of 1.1 was placed for 10 days, filtered, and the filter cake was washed and dried to prepare the precipitant raw material; the raw material was added with water to form a slurry with a solid content of 5%, and it was ground for 60 minutes by a sand mill to obtain Grinding intermediate, containing solid particle size D 50 0.22um, put 200.0g of the intermediate into a reaction flask, add 20.0g of sodium hydroxide, stir at 60°C for 2h, filter, rinse and dry the filter cake to obtain a stabilizer; take aluminum with a caustic ratio of 1.10 Put 216g of sodium aluminate into the reaction bottle, add 5.4g of stabilizer, stir at 70°C for 2 hours, and filter the precipitate to obtain a highly stable sodium aluminate solution. In this example, the sodium aluminate solution was left standing at 25° C. for >24 months without precipitation.

Embodiment 2

[0022] The ordinary sodium aluminate solution with a caustic ratio of 1.1 was placed for 10 days, filtered, and the filter cake was washed and dried to obtain the precipitant raw material; the raw material was added with water to form a slurry with a solid content of 15%, and it was ground by a sand mill for 10 minutes to obtain Grinding intermediate, containing solid particle size D 50 1.94um, put 200.0g of the intermediate into a reaction flask, add 2.0g of sodium hydroxide, stir at 60°C for 2 hours, filter, rinse and dry the filter cake to obtain a stabilizer; take aluminum with a caustic ratio of 1.10 Put 216g of sodium aluminate into the reaction bottle, add 1.1g of stabilizer, stir at 70°C for 2 hours, and filter the precipitate to obtain a highly stable sodium aluminate solution. In this example, the sodium aluminate solution began to produce precipitates after standing for 12 months at 25°C.

Embodiment 3

[0024] The ordinary sodium aluminate solution with a caustic ratio of 1.1 was placed for 10 days, filtered, and the filter cake was washed and dried to obtain the precipitant raw material; the raw material was added with water to form a slurry with a solid content of 7%, and it was ground for 30 minutes by a sand mill to obtain The particle size of the solid particles contained in the intermediate after grinding D 50 0.59um, put 200.0g of the intermediate into a reaction flask, add 20.0g of sodium hydroxide, stir at 60°C for 2h, filter, rinse and dry the filter cake to obtain a stabilizer; take aluminum with a caustic ratio of 1.10 Put 216g of sodium aluminate into the reaction bottle, add 5.4g of stabilizer, stir at 70°C for 2 hours, and filter the precipitate to obtain a highly stable sodium aluminate solution. In this example, the sodium aluminate solution began to produce precipitates after standing at 25° C. for 18 months.

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Abstract

The invention discloses a method for improving the stability of a sodium aluminate solution. The method comprises the following steps of: using a sodium aluminate solution precipitate as a raw material, carrying out grinding and alkali treatment to obtain a stabilizer, adding the stabilizer into a to-be-treated sodium aluminate solution, carrying out purification treatment, and performing filtering to obtain a high-stability sodium aluminate solution. According to the stabilizer prepared by the method provided by the invention and a use method thereof, the stable period of the sodium aluminatesolution can be prolonged, the chemical properties and the component content of sodium aluminate are not obviously changed in long-term placement, and the production process requirement of an aluminum hydroxide flame retardant can be met.

Description

technical field [0001] The invention mainly relates to the field of inorganic chemical industry, and mainly relates to a method for stabilizing sodium aluminate solution. Background technique [0002] Sodium aluminate, also known as sodium metaaluminate, is mainly used in the industry to produce aluminum hydroxide, which is an intermediate substance in the production of alumina by Bayer process. The sodium aluminate solution is in a metastable state, and it is easy to precipitate aluminum hydroxide crystals in a crystalline state. The stability of the sodium aluminate solution is related to the concentration of the solution, caustic ratio, storage time and other factors. Generally, the lower the concentration, the smaller the caustic ratio , The longer the storage time, the more unstable the sodium aluminate solution. In the industrial preparation of sodium aluminate solution, the sodium aluminate solution is hydrolyzed during the storage process, the solution changes from ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/04
CPCC01F7/046
Inventor 刘启奎岳涛翟云鸽任倩刘中海冯维春
Owner CHEM TECH ACAD OF SHANDONG PROVINCE
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