Preparation technology of aluminum hydroxide micropowder by two-stage seed separation

doi:10.3969/j.issn.1000-1565.2021.04.006

Abstract

Abstract: In order to study the application of aluminum sulfate extracted by gangue acid method and the fine production of aluminum hydroxide, the preparation technology of aluminum hydroxide micropowder was explored using two-stage seed separation method. The active seeds could be obtained by the reaction of aluminum sulfate extracted by gangue acid method and diluted sodium aluminate solution refined by Bayer method. Subsequently, alumina micropowders were prepared by the decomposition of first and second stage seeds in sodium aluminate solution with active seed. Various factors affected on the decomposition rate and particle size of aluminum hydroxide micropowder were investigated including the pH value of the seed pulp, decomposition temperature, seed ratio, decomposition time, α_kof sodium aluminate solution and sodium concentration of aluminate solution. And the results showed that the as-prepared aluminium hydroxide powder exhibited whiteness above 99%, Fe₂O₃ and SiO₂ content less than 0.006% and 0.05%, respectively, oil absorption value less than 0.70 mL/g and the average particle size in the range of 0.5-0.6 μm.

Key words: aluminum sulfate, two-stage seed separation, aluminum hydroxide, process conditions

CLC Number:

TF19

LIU Yanling,WEI Yanli. Preparation technology of aluminum hydroxide micropowder by two-stage seed separation[J]. Journal of Hebei University(Natural Science Edition), 2021, 41(4): 378-383.

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