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Method for synthesizing high-activity monodisperse aluminum hydroxide seed crystals

A technology of aluminum hydroxide, synthesis method, applied in chemical instruments and methods, preparation of alkali metal aluminate/alumina/aluminum hydroxide, aluminum compounds, etc., can solve problems such as lack of ultrafine aluminum hydroxide

Inactive Publication Date: 2020-06-30
CHEM TECH ACAD OF SHANDONG PROVINCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the lack of corresponding seeds in the production of ultra-fine aluminum hydroxide by the existing nitric acid method, the present invention provides a method for synthesizing high-activity monodisperse aluminum hydroxide seed crystals, which optimizes the nucleation rate in the process of preparing aluminum hydroxide by the nitric acid method, so that the preparation The samples have narrow particle size distribution and low oil absorption

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Take 600g (2.37mol) of sodium aluminate with a caustic ratio of 1.4, stir and heat up to 65°C, add 348.4g of 60% nitric acid dropwise, and complete the dropwise addition in 60 minutes, filter, wash and dry to obtain 184.86g of aluminum hydroxide fine powder. Add 431.34g pure water to be mixed with 30% slurry in the aluminum hydroxide micropowder, grind 120min in the sand mill; Add 46.2g (4.5% of the mass of the aluminum hydroxide slurry) of 60% nitric acid, stir at 70° C. for 3.0 h, wash and dry to obtain aluminum hydroxide seed crystals, and the particle size of the seed crystals is detected to be D50=310 nm.

[0030] Apply the obtained aluminum hydroxide seed crystals to the process of producing aluminum hydroxide by the nitric acid method. When the temperature of sodium aluminate rises to 60°C, add 2% (ratio of aluminum hydroxide mass to sodium aluminate mass) seed crystals dropwise , after the addition of the acid was completed, it was filtered, washed and dried, an...

Embodiment 2

[0032] Take 600g (2.16mol) of sodium aluminate with a caustic ratio of 1.6, stir and heat up to 50°C, add 362.9g of 60% nitric acid dropwise, the addition is completed in 60 minutes, filter, wash and dry to obtain 168.5g of aluminum hydroxide fine powder. Add 252.7g pure water to be mixed with the slurry of 40% in the aluminum hydroxide micropowder, grind 20min in the sand mill; Add 7g (1% of the mass of the aluminum hydroxide slurry) of 60% nitric acid, stir at 50° C. for 1 h, wash and dry to obtain aluminum hydroxide seed crystals, and the particle size of the seed crystals is detected, D50=495nm. Apply the obtained aluminum hydroxide seed crystals to the process of producing aluminum hydroxide with nitric acid. When the temperature of sodium aluminate rises to 60°C, add 2% (ratio of aluminum hydroxide mass to sodium aluminate mass) seed crystals dropwise , after the addition of the acid was completed, it was filtered, washed and dried, and the obtained aluminum hydroxide D5...

Embodiment 3

[0034] Take 600g (2.78mol) of sodium aluminate with a caustic ratio of 1.1, stir and heat up to 60°C, add 321.1g of 60% nitric acid dropwise, and complete the dropwise addition in 60 minutes, filter, wash and dry to obtain 216.8g of aluminum hydroxide fine powder. Add 650.6g pure water to the aluminum hydroxide micropowder and be mixed with 25% slurry, grind 30min in the sand mill; Add 28.9g (2% of the mass of the aluminum hydroxide slurry) of 60% nitric acid, stir at 60° C. for 1.5 h, wash and dry to obtain aluminum hydroxide seed crystals, and the particle size of the seed crystals is detected as D50=449nm. Apply the obtained aluminum hydroxide crystal seed to the process of preparing aluminum hydroxide by nitric acid method. When the temperature of sodium aluminate rises to 60°C, add 2% (ratio of aluminum hydroxide mass to sodium aluminate mass) crystal seed After the addition of the acid is completed, it is filtered, washed and dried, and the obtained aluminum hydroxide ha...

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Abstract

The invention discloses a method for synthesizing high-activity monodisperse aluminum hydroxide seed crystals. The method comprises the following steps: reacting nitric acid with sodium aluminate to obtain aluminum hydroxide micro-powder, and converting the micro-powder into the high-activity monodisperse aluminum hydroxide seed crystals through grinding, crushing and acid hydrolysis polymerization. Compared with the traditional process seed crystal, the aluminum hydroxide seed crystal prepared by the invention has the characteristics of higher activity, low agglomeration degree and the like,is suitable for the process of producing the superfine aluminum hydroxide flame retardant by a nitric acid method, and is beneficial to reducing the particle size distribution of the product and reducing the oil absorption of the product.

Description

technical field [0001] The invention relates to the field of inorganic chemical industry, in particular to a method for synthesizing aluminum hydroxide seed crystals. Background technique [0002] Aluminum hydroxide is a widely used inorganic non-metallic material, which can be used as flame retardant, catalyst carrier, biomedical drug and other fields. As an inorganic flame retardant, aluminum hydroxide has the advantages of smoke elimination, poison suppression, and no secondary pollution. It is considered to be an environmentally friendly green inorganic flame retardant. At present, aluminum hydroxide is mainly prepared by the Bayer process. The sodium aluminate solution is decomposed and crystallized by adding aluminum hydroxide seeds to obtain aluminum hydroxide. However, the Bayer process requires the addition of a large amount of aluminum hydroxide seeds as a decomposition drive. There are disadvantages such as low decomposition efficiency (about 50%), long reaction ...

Claims

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Application Information

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IPC IPC(8): C01F7/14
CPCC01F7/141C01F7/021C01P2004/62C01P2006/19
Inventor 刘启奎翟云鸽岳涛任倩刘中海冯维春
Owner CHEM TECH ACAD OF SHANDONG PROVINCE
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