Reaction behavior and mechanism of anatase in digestion process ofdiasporic bauxite

来源期刊：中国有色金属学报(英文版)2010年第1期

论文作者：李小斌 付伟岸 周秋生 刘桂华 彭志宏

文章页码：142 - 146

Key words：anatase; hydroxy calcium titanate; calcium titanate; high-pressure digestion; reaction mechanism

Abstract: Based on the study of influence of temperature, digestion time, amount of CaO added and composition of aluminate solution on reaction behavior of pure anatase in high-pressure digestion process of bauxite, reaction mechanism of anatase was preliminarily determined. Anatase first reacts with caustic soda to produce Na₂TiO₃, then the resultant Na₂TiO₃ reacts with 3CaO·Al₂O₃·6H₂O resulting from the reaction of CaO with sodium aluminate solution to produce CaO·2TiO₂·H₂O which eventually converts into CaTiO₃. Higher temperature, concentration of free Na₂O_k (the caustic soda uncombined with aluminate anions in the form of Na₂O) and molar ratio of CaO to TiO₂ are favorable to the conversion of CaO·2TiO₂·H₂O to CaTiO₃. And Al(OH)₄^- shows the function of a catalyzer in the reaction of anatase with caustic soda with or without CaO added during the digestion process of diasporic bauxite.

基金信息：the National Basic Research Program of China