拜耳法氧化铝生产过程中锂的富集机制研究

摘要

Enrichment mechanism of lithium in Bayer Process of alumina production was studied.The results show that 80 ％ of lithium in bauxite first flows into sodium aluminate solution in form of lithium aluminate during pressure digestion,and then goes into crystallized aluminium hydroxide during seed precipitation.25％ of lithium aluminate loss occurs in sublimation,and the rest lithium is enriched in alumina in form of oxide.Lithium in alumina rises with increase of lithium concentration in bauxite,and drops with decrease of A/S of bauxite.%研究了拜耳法氧化铝生产过程中锂的富集机制.结果表明,在拜耳法氧化铝生产工艺中,铝土矿中约有80％金属锂在高压溶出过程中以铝酸锂的形式进入铝酸钠溶液,后经晶种分解全部进入结晶氢氧化铝中,在氢氧化铝的高温煅烧过程中,因升华作用损失约25％的金属锂,其余以氧化物形式富集在氧化铝制品中,其含量随着入磨铝土矿中金属锂含量的增加而增加、随铝土矿A/S比的增加而降低.