力化学对铝土矿溶出的作用
来源期刊：中南大学学报(自然科学版)1999年第3期
论文作者：刘今 龙志奇 巩前明 吴若琼
文章页码：49 - 52
关键词：力化学;机械活化;氧化铝;铝土矿;溶出
Key words：mechanochemistry; mechanical activation; Al 2O 3; bauxite; solubilise
摘 要：力化学方法处理铝土矿，可明显改善其 溶出性能．对国内２种有代表性的铝土矿：广西平果矿和山西普铝矿采用该法处理，使矿石中的一水硬铝石结构发生变化，从而降低了溶出温度及溶出用碱液浓度， 并提高了溶出速率．对力化学引起的反应性能变化及其内在原因进行了探讨．据此确认该法对我国氧化铝工业节能降耗、提高经济效益具有实际意义．
Abstract: The mechanochemistry effects on the process of diaspore type bauxite in sodium aluminate solution was investigated. The results show some surprising effects. For example, the solution ratio of Al 2O 3 in activated ores is twice as high as that in non activated ores with high alumina silica ratio at 210 ℃ and is higher than the equilibrium value, the reaction rate constant rises by 27% and the optimal reaction temperature for digestion and the optimal concentration of sodium solution can be lower. It has been proved that the mechanochemistry method can selectively disilicate SiO 2 from bauxite with highly concentrated silica and raise alumina silica ratio from 4.8 up to 15～30 to obtain ores that can be digested with Bayer process.
