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. 10    October 2014

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Influence of thermal history on conversion of aluminate species in sodium aluminate solution
Xiao-bin LI, Dong-feng ZHAO, Shuai-shuai YANG, Dan-qin WANG, Qiu-sheng ZHOU, Gui-hua LIU

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

Abstract:It is necessary to clarify the influence of thermal history on the conversion of aluminate species in sodium aluminate solution in order to optimize Bayer alumina production. The interconversion of various solution species in the systems was investigated by measuring the infrared spectra of sodium aluminate solution with different compositions after separate heat treatment, dilution and concentration. The results show that increasing temperature or prolonging holding time favors the transformation of Al2O(OH)62- to Al—OH vibration (condensed AlO4 tetrahedral aluminate ion) at about 880 cm-1 and Al(OH)4-. A12O(OH)62- and Al—OH tetrahedral dimer ions convert rapidly to Al(OH)4- during the dilution process; however, the back transformation of Al(OH)4- to the Al—OH tetrahedral dimer ions can occur in diluted sodium aluminate solution. As for the concentration process, the transformation of Al(OH)4- to A12O(OH)62- and Al—OH tetrahedral dimer ions can take place, while it is relatively difficult to transform to A12O(OH)62-.

 

Key words: aluminate ions; structural changes; infrared spectrum; thermal history

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

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

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