氢氧化铝活化对水热法制备勃姆石的影响

doi:10.19964/j.issn.1006-4990.2021-0772

Abstract

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:

TQ133.1

YANG Yongyu,TIAN Peng,ZHOU Ruohui,XU Qianjin,LIU Kunji,NING Guiling. Effect of gibbsite activation on preparation of boehmite by hydrothermal method[J]. Inorganic Chemicals Industry, 2022, 54(9): 55-62.

Figures/Tables 10

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Table 1

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Table 2

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温度/℃	残余量/%	温度/℃	残余量/%
150	100.00	210	99.80
160	99.98	220	99.73
180	99.90	230	99.61
190	99.88	240	99.28
200	99.85

活化温度/℃	相对峰强	活化温度/℃	相对峰强
未活化	I₀	200	0.892I₀
160	0.965I₀	220	0.540I₀
180	0.954I₀

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Inorganic Acid-Base-Salt Committee of CIESC

Effect of gibbsite activation on preparation of boehmite by hydrothermal method

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