Inorganic Chemicals Industry ›› 2022, Vol. 54 ›› Issue (9): 55-62.doi: 10.19964/j.issn.1006-4990.2021-0772

• Research & Development • Previous Articles     Next Articles

Effect of gibbsite activation on preparation of boehmite by hydrothermal method

YANG Yongyu1(),TIAN Peng1,2(),ZHOU Ruohui1,XU Qianjin2,LIU Kunji2,NING Guiling1()   

  1. 1. Dalian University of Technology-Baohong Technology United Research Center for Advanced Lithium Battery Materials,School of Chemical Engineering,Dalian University of Technology,Dalian 116023,China
    2. Jiangxi Baohtech Science Co.,Ltd.
  • Received:2021-12-23 Online:2022-09-10 Published:2022-09-22
  • Contact: TIAN Peng,NING Guiling E-mail:dllgyyy@mail.dlut.edu.cn;tianpeng@dlut.edu.cn;ninggl@dlut.edu.cn

Abstract:

Boehmite was prepared by hydrothermal method with gibbsite powder as raw material after activation.The effect of gibbsite activation on boehmite grain size was investigated,and the action mechanism was discussed.The results showed that by using unactivated gibbsite as raw materials,the particle size of boehmite was about 2 μm and the particle size of boehmite changed in the range of 0.3 μm to 2 μm by using activated gibbsite(treated under 160~220 ℃) as raw materials.The activated aluminum hydroxide and hydrothermal reaction intermediates were characterized.The mechanism of action from structural analysis was inferred:A small amount of boehmite was formed during activation process.These boehmite became crystal seeds during the hydrothermal conversion of Al(OH)3 to AlOOH.With increase of activation temperature or activation time, the number of boehmite crystal seeds was increased,the particle size of hydrothermal products(boehmite) was reduced,and hydrothermal reaction rate was speeded up.This work was expected to provide a new route for the preparation of boehmite and a theoretical basis.

Key words: gibbsite, hydrothermal, particle size, boehmite, heating activation

CLC Number: