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A kind of preparation method of high-efficiency aluminum hydroxide seed crystal

A technology of aluminum hydroxide and seed crystals, which is applied in the field of preparation of high-efficiency aluminum hydroxide seed crystals, and can solve the problems of unstable seed crystal particle size and activity, low thermal decomposition temperature, and insufficient crystallization strength of products

Active Publication Date: 2022-08-02
CHEM TECH ACAD OF SHANDONG PROVINCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there are mainly three methods to obtain the seed crystals required for the synthesis of ultrafine aluminum hydroxide, one is ball milling aluminum hydroxide seed method, the other is aluminum sulfate seed method, and the third is carbon seed method; these methods are common There are following problems: the one, the gained seed crystal particle size and activity are not stable, cause the obtained superfine aluminum hydroxide particle size to be unstable, often appear unqualified batch products; The crystallization strength of the product produced as a seed crystal is not enough, the thermal decomposition temperature is low, and the oil absorption value is high; the third is that the obtained seed crystal particle size is too large, and small particle size aluminum hydroxide products cannot be obtained.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Add m to a 1L four-neck flask equipped with a thermometer, stirring device, ultrasonic probe and reflux device (水) :m (氯化铝) = 2:10 total 400.02g (aluminum trichloride 0.5mol), mix and stir to heat up to 60 ° C, after the aluminum chloride is completely dissolved, turn on ultrasonic, ultrasonic frequency 40KHz, slowly dropwise add 122.62g 25% ammonia solution, The dropwise addition was completed for 2 hours, and the reaction was continued for 1 hour after the dropwise addition. The reaction solution was filtered and washed with water to obtain aluminum hydroxide colloidal seeds; the seed coefficient was 0.001, and the sodium aluminate semen was decomposed at 60°C for 6 hours, the decomposition rate was 59.39%, and the average particle size was 59.39%. 0.85um.

Embodiment 2

[0020] Add m to a 1L four-neck flask equipped with a thermometer, stirring device, ultrasonic probe and reflux device (水) :m (氯化铝) = 1:10 total 733.37g (aluminum trichloride 0.5mol), mixing and stirring to heat up to 60 ° C, after the aluminum chloride is completely dissolved, turn on ultrasonic, ultrasonic frequency 40KHz, slowly dropwise add 122.62g 25% ammonia solution, The dropwise addition was completed for 2 hours, and the reaction was continued for 1 hour after the dropwise addition was completed. The reaction solution was filtered and washed with water to obtain aluminum hydroxide colloidal seeds; the seed coefficient was 0.002, and the sodium aluminate semen was decomposed at 60°C for 6 hours, the decomposition rate was 56.41%, and the average particle size was 56.41%. 0.91um;

Embodiment 3

[0022] Add m to a 1L four-neck flask equipped with a thermometer, stirring device, ultrasonic probe and reflux device (水) :m (氯化铝) = 3:10 total 288.9g (aluminum trichloride 0.5mol), mix and stir to heat up to 60 ℃, after all the aluminum chloride is dissolved, turn on ultrasonic, ultrasonic frequency 40KHz, slowly drip 122.62g 25% ammonia solution into it, The dropwise addition was completed for 2 h, the reaction was continued for 1 h after the dropwise addition was completed, and the reaction solution was filtered and washed with water to obtain aluminum hydroxide colloidal seed crystals. The seed coefficient is 0.001, and the sodium aluminate semen is decomposed at 60°C for 6h, the decomposition rate is 57.62%, and the average particle size is 0.81um;

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Abstract

The invention mainly relates to the field of inorganic chemistry, in particular to a method for preparing a high-efficiency aluminum hydroxide crystal seed. The present invention mainly uses weak base and aluminum salt as raw materials, and is prepared by ultrasonic reaction. Described weak base is ammoniacal liquor or sodium bicarbonate or potassium bicarbonate. The present invention obtains crystal seeds with relatively uniform particle size and activity through the forced dispersion of mild conditions and ultrasonic waves, and the obtained aluminum hydroxide product has a relatively uniform particle size, is not easy to agglomerate, and has a very narrow particle size distribution. Uniform particle size, less agglomeration, and less sodium ions encapsulated, greatly improves the traditional process of uneven particle size, high sodium content, complex process, high cost, and is more conducive to large-scale technological production.

Description

technical field [0001] The invention mainly relates to the field of inorganic chemistry, in particular to a method for preparing a high-efficiency aluminum hydroxide crystal seed. Background technique [0002] Aluminum hydroxide is currently the largest and most widely used inorganic flame retardant additive. It is not only flame retardant, but also prevents smoke, does not produce drips, and does not produce toxic gases, so it is widely used. [0003] The method of industrial production of aluminum hydroxide is alkaline production. The basic principle is to make the alumina and alkali in the ore produce sodium aluminate under certain conditions, and separate it from impurities such as silica and iron oxide after entering the solution, and then make the pure The sodium aluminate solution was decomposed into aluminum hydroxide. The production of alumina by alkaline method can be divided into Bayer method, sintering method and combined method. These three methods are sodium a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/02C01F7/14C01F7/30
CPCC01F7/02C01F7/14C01P2004/62
Inventor 刘启奎李培培翟云鸽岳涛徐婷冯维春
Owner CHEM TECH ACAD OF SHANDONG PROVINCE