摘要
为避免碳酸钠随母液循环积累给生产造成危害，对影响选矿拜耳法蒸发母液中碳酸钠溶解度的因素——母液中苛性碱浓度（以NazOx表示）和结晶排盐温度等进行了试验研究，确定了溶液中苛性碱浓度、溶液密度与碳酸钠溶解度的对应关系。结果表明，选矿拜耳法蒸发母液中碳酸钠的溶解度随母液中苛性碱浓度的提高而显著下降，母液中苛性碱浓度提高到约320g／L时，其w（Na2Oc）可降低到7％以下；温度的影响较小，在90-100℃条件下析出的碳酸钠晶体沉降效果较好。
To avoid harm of sodium carbonate accumulating in circle mother liquor on alumina production,the effection of Na2Ok concentration in mother liquor and removal salt temperature by crystallization on sodium carbonate solubility in evaporation mother liquor has been experimented. The relationship with Na2Ok concentrate in solution, solution density and sodium carbonate solubility are determined. The results show that sodium carbonate solubility obviously decreases with increasing of Na2Ok concentration in mother liquor. The w（Na2Oc） is less than 7% When Na2Ok concentrate in mother liquor increases to 320 g/L. Temperature has a small impaction on Na2Ok concentration, sedimentation effection of sodium carbonate crystal separated out is better in the range of 90-100 ℃.
出处
《湿法冶金》
CAS
2007年第1期49-51,共3页
Hydrometallurgy of China
关键词
选矿拜耳法
蒸发母液
碳酸钠溶解度
结晶排盐
ore dressing Bayer process
evaporation mother liquor
removal of salt by crystallization
sodium carbonate solubility
