难选高硅型氧化锌矿机械活化碱法浸出研究  

Alkali leaching of refractory high silica zinc oxide ore by mechanical activation

作　　者：赵中伟[1,2] 龙双[1,2] 陈爱良[1,2] 霍广生[1,2] 贾希俊[1,2] 李洪桂[1,2] 阎海泉 

机构地区：[1]中南大学冶金科学与工程学院,湖南长沙410083 [2]中南大学稀有金属,冶金与材料制备湖南省重点实验室,湖南长沙410083 [3]白银有色金属公司,甘肃白银730900

出　　处：《中南大学学报（自然科学版）》2010年第4期1246-1250,共5页Journal of Central South University:Science and Technology

基　　金：“973”国家重点基础研究发展计划支持项目(2007CB613603);教育部“新世纪优秀人才支持计划”(NCET-05-0692)

摘　　要：针对氧化锌矿综合利用工艺的现状和不足,将处理氧化铝矿物的拜耳法移植于氧化锌矿的湿法处理过程而形成"锌拜耳法",提出氧化锌矿机械活化碱法浸出的新工艺。实验结果表明:当NaOH的用量为理论用量的3.5倍,温度为140℃,浸出时间2 h,液固比为10:1(mL/g)时,锌的浸出率达到95.1%,硅的浸出率为45.5%。氧化锌矿在高温、长时间和强机械活化作用下生成难溶产物Na2ZnSiO4是导致锌浸出率降低的主要原因。The present state and shortages comprehensive utilization of zinc oxide ores were described in this paper,and the Bayer process used to treat bauxite was transplanted to treat zinc oxide ores.So,this process can be regarded as ＂zinc Bayer process＂.And a new method for alkaline leaching of refractory hemimorphite by mechanical activation was put forward.Optimized leaching parameters are obtained through experiments,as follows： the sodium hydroxide dosage = 3.5 times as much as the theoretical quantity,the leaching time = 2 h,temperature = 140 ℃ and ratio of leaching liquid to leaching solid（L/S） =10？1.Under these conditions,the leaching rate of zinc and silicon can reach 95.1% and 45.5%.Overlong leaching time and intense mechanical activation will deteriorate the zinc leachability and thus accelerate the Na2ZnSiO4 formation.

关 键 词：拜耳法 浸出 机械活化 浸出率 

分 类 号：TF813[冶金工程—有色金属冶金]