Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 24    No. 1    January 2014

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Variation of soda content in fine alumina trihydrate by seeded precipitation
Gui-hua LIU, Peng WANG, Tian-gui QI, Xiao-bin LI, Lü TIAN, Qiu-sheng ZHOU, Zhi-hong PENG

School of Metallurgy and Environment, Central South University, Changsha 410083, China

Abstract:High soda content in fine alumina trihydrate(ATH) limits its application and increases the soda consumption. The variation of soda content in the fine ATH by seeded precipitation was determined by detection of electric conductivity of solution, soda content in ATH, measurement of particle size distribution and microscopic analysis. The results show that high concentration of sodium aluminate solution, ground circulative seed, low temperature or fast initial precipitation rate increases the soda content in ATH. Soda mainly exists in lattice soda and less soda in desilication product (DSP) exists in the fine ATH precipitated from sodium aluminate solution with concentration of Al2O3 Al2O3) more than 160 g/L and mass ratio of alumina to silica (μSiO2) of 400, and lattice soda decreases with increasing initial precipitation temperature, aging seed, and low precipitation rate and precipitation time. Results also imply that ion-pair influences lattice soda content in ATH on the basis of electric conductivity variation.

 

Key words: alumina trihydrate; seeded precipitation; soda content; lattice soda; sodium aluminate solution

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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