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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 13    No. 3    June 2003

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Intensifying digestion of diaspore and separation of alumina and silica
LI Xiao-bin(李小斌), PENG Zhi-hong(彭志宏),
LIU Gui-hua(刘桂华), ZHOU Qiu-sheng(周秋生)

College of Metallurgical Science and Engineering,
Central South University, Changsha 410083, China

Abstract:It was found that there lies a linear relationship among the thermodynamic data of complicate inorganic compounds with similar components. A method for estimating the thermodynamic data of complicate compound and a thermodynamic database involving alumina production were developed. It was found that the alumina digestion rate of activated diasporic bauxite by means of heat field increased much due to the structure aberration, i.e, from perfect structure to unstable corundum. The results from thermodynamic calculation and experiments showed that it was feasible for desilication at atmospheric pressure, and the effects on equilibrium concentration of SiO2 included temperature, mole ratio of Na2O/Al2O3 (αk), caustic and Na+ concentration. The technology of desilication of green liquor at atmosphere and separation of alumina and silica in aluminate solution with high concentration were established. The reaction activity of compounds containing silica and the converting law among compounds were studied, and the prototype technology of desilication products by hydrotreatment was also developed.

 

Key words:  alumina; diaspore; intensifying digestion; separation of alumina and silica

ISSN 1672-7029
CN 43-1423/U

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