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A kind of particle size control method of aluminum hydroxide synthesis process

A technology of aluminum hydroxide, synthesis process, applied in the field of inorganic flame retardants

Active Publication Date: 2021-08-06
CHEM TECH ACAD OF SHANDONG PROVINCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at a series of problems existing in the particle size control technology in the existing aluminum hydroxide preparation process, the present invention uses sodium metaaluminate, sulfuric acid, and aluminum hydroxide seed crystals as raw materials to synthesize aluminum hydroxide, and uses various technical methods during the synthesis process. Synergistic effect to achieve precise regulation of product particle size, and at the same time achieve the effect of uniform particle size distribution and regular microscopic morphology

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Add 10g of ordinary aluminum hydroxide product to 90g of 5% dilute sulfuric acid aqueous solution, stir to make a uniform dispersion, transfer the dispersion to a high-speed centrifuge bottle, centrifuge at 5000r / min for 10min, pour out the upper dispersion , to obtain an active seed dispersion with a particle size range of 0-1um; continue to add 90g of dilute sulfuric acid aqueous solution to the centrifuge bottle, centrifuge at 4000r / min for 10min, and pour out the upper dispersion to obtain an active seed crystal with a particle size range of 1-3um. Seed crystal dispersion; continue to add 90g dilute sulfuric acid aqueous solution to the centrifuge bottle, centrifuge at 3000r / min for 10min, pour out the upper layer dispersion to obtain an active seed dispersion with a particle size range of 3-5um; continue to add 90g dilute sulfuric acid aqueous solution, centrifuge at 2000r / min for 10min, pour out the upper layer dispersion to obtain an active seed dispersion with a ...

Embodiment 2

[0027] Add the active seed crystal dispersion with a particle size range of 0-1um to the reaction bottle, raise the temperature to 65°C, start stirring, and mix 200g of sodium metaaluminate solution (1.433mol) with 128.7g of 60% sulfuric acid aqueous solution (0.788mol ), added dropwise to the reaction flask within 8 hours, continued to keep warm for 2 hours, the reaction solution was filtered and separated, the filter cake was rinsed with 500 g of hot water, and the filter cake was dried at 150°C for 4 hours to obtain the product ① of the present invention, and its particle size D50 was 1.15um.

Embodiment 3

[0029] Add the active seed crystal dispersion with a particle size range of 7-10um to the reaction bottle, raise the temperature to 65°C, start stirring, and mix 200g of sodium metaaluminate solution (1.433mol) with 117.03g of 60% sulfuric acid aqueous solution (0.717mol ), added dropwise to the reaction flask within 8 hours, continued to keep warm for 2 hours, filtered and separated the reaction solution, rinsed the filter cake with 500 g of hot water, dried the filter cake at 150°C for 4 hours, and obtained the product ② of the present invention, whose particle size D50 was 8.70um.

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Abstract

The invention discloses a particle size control method in the synthesis process of aluminum hydroxide, which includes preparing aluminum hydroxide with sodium metaaluminate, sulfuric acid, and crystal seeds as raw materials, and first obtaining different particle sizes through the method of "acid etching treatment-centrifugal classification" During the reaction process, the particle size of the product can be accurately controlled by adjusting the particle size of the seed crystal and the acidity of the system in two ways. Aluminum hydroxide product D prepared by the present invention 50 The particle size can be adjusted within the range of 2-10μm, the particle size distribution of the product is uniform, and the shape is regular, which can meet various needs of high-end application fields.

Description

technical field [0001] The invention mainly relates to the field of inorganic flame retardants, in particular to a particle size control method in the synthesis process of aluminum hydroxide. Background technique [0002] With the gradual increase in the flame retardant grade requirements of various materials in various countries around the world, flame retardant materials have attracted the attention of the whole society and gained broad development space. Aluminum hydroxide, chemical formula Al(OH) 3 , above 200°C, it begins to lose water and turns into Al 2 o 3 , amphoteric hydroxide. Aluminum hydroxide is the largest and most widely used inorganic flame retardant additive in the world. It not only has flame retardant properties, but also has the functions of preventing smoke, no dripping and toxic gases, no secondary pollution after burning, good filling effect, Low cost and other advantages, the usage is increasing year by year. [0003] Therefore, as its applicati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/14
CPCC01F7/141
Inventor 刘启奎翟云鸽岳涛任倩徐婷冯维春
Owner CHEM TECH ACAD OF SHANDONG PROVINCE
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