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Method for preparing high-purity superfine aluminum hydroxide flame retardant by decomposition method

An ultra-fine aluminum hydroxide, aluminum hydroxide technology, applied in chemical instruments and methods, alkali metal aluminate/alumina/aluminum hydroxide preparation, inorganic chemistry and other directions, can solve the complex preparation process of ultra-fine crystal seeds, Industrial production is difficult to control and other problems, to achieve the effect of low cost, simple method and high whiteness

Inactive Publication Date: 2020-05-12
HEFEI ZHONGKE FLAME RETARDANT NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Above-mentioned two kinds of ultrafine aluminum hydroxide production methods, the preparation process of its ultrafine seed crystal is more complicated, and industrial production is difficult to control

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Embodiment 1 provides a kind of decomposition method and prepares the method for high-purity superfine aluminum hydroxide flame retardant, and production process comprises the following steps:

[0057] (1) Preparation of aluminum hydroxide seed crystals: the caustic ratio αk of sodium aluminate refining solution by sintering method is 1.6, the alumina content is 90g / L, cool to 25°C through a plate heat exchanger, add white mud washing solution until refined The caustic ratio αk of the liquid is 1.4, and the alumina content is 60g / L. Then, paddle stirring is used in the carbon separation tank, and CO with a concentration of 25% is introduced. 2 gas, the decomposition time is 40min, and finally a gelatinous aluminum hydroxide slurry with a pH of 9 is obtained.

[0058] (2) Decomposition method to prepare aluminum hydroxide slurry: adding the gelatinous aluminum hydroxide glue solution prepared in step (1) to caustic ratio αk is 1.6, and alumina content is sintering method...

Embodiment 2

[0064] Embodiment 2 provides a method for preparing high-purity ultrafine aluminum hydroxide flame retardant by decomposition method, and the production process includes the following steps:

[0065] (1) Preparation of aluminum hydroxide seed crystals: the caustic ratio αk of the sodium aluminate refining solution by sintering method is 1.4, the alumina content is 80g / L, cool to 50°C through a plate heat exchanger, add white mud washing solution until refined The caustic ratio αk of the liquid is 1.3, the alumina content is 40g / L, and then a paddle-type stirring is used in the carbon separation tank, and CO with a concentration of 10% is introduced. 2 gas, the decomposition time was 30min, and finally a gelatinous aluminum hydroxide slurry with a pH of 8.5 was obtained.

[0066] (2) Preparation of aluminum hydroxide slurry by decomposition method: the gelatinous aluminum hydroxide glue solution prepared in step (1) is added to a caustic ratio α k of 1.4, and the sintering meth...

Embodiment 3

[0072] Embodiment 3 provides a method for preparing high-purity ultrafine aluminum hydroxide flame retardant by decomposition method, and the production process includes the following steps:

[0073] (1) Preparation of aluminum hydroxide seed crystals: the caustic ratio αk of sodium aluminate refining solution by sintering method is 1.7, the alumina content is 120g / L, cool to 10°C through a plate heat exchanger, add white mud washing solution until refined The caustic ratio αk of the liquid is 1.5, the alumina content is 80g / L, and then a paddle-type stirring is used in the carbon separation tank, and CO with a concentration of 40% is introduced. 2 gas, the decomposition time is 50min, and finally a gelatinous aluminum hydroxide slurry with a pH of 10.5 is obtained.

[0074] (2) Decomposition method to prepare aluminum hydroxide slurry: adding the gelatinous aluminum hydroxide glue solution prepared in step (1) to caustic ratio α k is 1.7, and the sintering method sodium alumi...

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Abstract

The invention relates to the technical field of preparation methods of aluminum hydroxide flame retardants, in particular to a method for preparing a high-purity superfine aluminum hydroxide flame retardant by a decomposition method. The production process of the aluminum hydroxide flame retardant comprises the following steps: (1) preparation of an aluminum hydroxide seed crystal: cooling a Bayerprocess or sintering process sodium aluminate refined solution, and carrying out carbon decomposition in a carbon decomposition tank to form a gel-like aluminum hydroxide gel slurry; (2) preparationof aluminum hydroxide slurry through decomposition: adding the gelatinous aluminum hydroxide glue solution prepared in the step (1) into a Bayer process or sintering process sodium aluminate refined solution, and stirring and decomposing the mixture in a seed precipitation tank to obtain ultrafine aluminum hydroxide slurry; (3) solid-liquid separation on the aluminum hydroxide slurry: separating the superfine strong aluminum oxide glue solution prepared in the step (2) through a filter to obtain a filter cake; and (4) drying: carrying out paddle type drying and rotary flash evaporation drying.The purity of the aluminum hydroxide flame retardant prepared by the preparation method is not lower than 99%, the whiteness is not lower than 98%, and the average particle size is 1-2 [mu] m.

Description

technical field [0001] The invention relates to the technical field of preparation methods of aluminum hydroxide flame retardants, in particular to a method for preparing high-purity ultrafine aluminum hydroxide flame retardants by decomposition. Background technique [0002] Due to the good thermal stability of ultra-fine aluminum hydroxide and no secondary pollution during combustion, it is a green flame retardant product. In recent years, the demand for flame retardant ultra-fine aluminum hydroxide has increased sharply at home and abroad, and the research and development cost is low. The ultra-fine aluminum hydroxide flame retardant has broad market application prospects and economic benefits. At present, the preparation of ultra-fine aluminum hydroxide mainly includes mechanical pulverization and chemical methods. In order to reverse the aggregation of ultra-fine aluminum hydroxide, dispersant is often added to the ultra-fine aluminum hydroxide before drying to prevent ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/14C09K21/02
CPCC01F7/14C01F7/142C01F7/148C01P2004/61C01P2006/60C01P2006/80C09K21/02
Inventor 王周王立贵
Owner HEFEI ZHONGKE FLAME RETARDANT NEW MATERIAL
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