拜耳法生产氧化铝锌杂质的脱除研究现状

摘要

Zinc impurities in bauxite will directly affect the product purity and production targets of alumina.The zinc hydroxide belongs to amphoteric substances.Therefore,zinc in the Bayer process production system exists mainly in the form of ZnO22-,and zinc and aluminum in the caustic liquid have very similar chemical behavior,which makes the zinc removal in Bayer liquor extremely difficult.The main method in domestic and abroad is adding sulfide especially adding high-sulfur bauxite ore to remove zinc and it has become a good way to zinc removal in Bayer process.%铝土矿中的锌杂质会直接影响氧化铝产品的纯度,影响氧化铝的生产指标.由于氢氧化锌为两性物质,所以锌在拜耳法生产系统中主要以ZnO22-的形式存在,再加上锌与铝在苛性溶液中有着较为相似的化学行为,这就使得在拜耳液中脱锌极其困难.目前,国内外主要采用添加硫化物的方法除锌,尤其是在配矿时添加高硫铝土矿除锌,这种方法已经成为拜耳法除锌的很好选择.