硫酸铵低温焙烧中低品位氧化锌矿  

Low Grade Zinc Ore by Low Temperature Roasting Using(NH_4)_2SO_4

作　　者：申晓毅[1] 孙毅[1] 宋继强[1] 翟玉春[1] 

机构地区：[1]东北大学材料与冶金学院,沈阳110004

出　　处：《材料研究学报》2012年第4期396-401,共6页Chinese Journal of Materials Research

基　　金：国家重点基础研究发展计划2007CB613603;中央高校基本科研业务费专项资金N110402012资助项目~~

摘　　要：以中低品位氧化锌矿为原料、硫酸铵为反应介质,通过低温焙烧得到热料,研究了焙烧温度对Zn提取率的影响。结果表明,培烧温度为450℃时锌的提取率最高,为91.8%。焙烧温度低反应不充分;焙烧温度过高H_2SO_4分解挥发,降低反应率。将熟料溶出过滤得到硫酸锌溶液,经净化除杂得到洁净的硫酸锌溶液。以硫酸锌溶液为原料、碳酸铵为沉淀剂,采用沉淀法制备出碱式碳酸锌前驱体,将其煅烧制备了微细氧化锌粉体。采用XRD、SEM及化学成分分析等手段对前驱体和氧化锌粉体进行了表征。结果表明,溶液中OH^-、HCO_3^-与Zn^(2+)共同作用得到前驱体,前驱体受热脱水、分解得到ZnO粉体。碱式碳酸锌前驱体为Zn_4(CO_3)(OH)_6·H_2O,呈类球形颗粒团聚体,氧化锌粉体为六方铅锌矿结构,颗粒呈球形,分散性良好。The roasting clinker was successfully obtained by low temperature roasting employing low grade zinc ore as row material and ammonium sulfate as reaction medium. The influence of baking temperature in Zn extraction rate was investigated. The results show that the Zn extraction rate reaches to the maximum of 91.8% at 450℃. The reaction was not sufficient at low temperature, in the contrary, the reaction rate decreased due to the decomposition and volatilization of H2SO4. The ZnS04 solution was prepared through digestion and filtration processes, and then the pure ZnSO4 solution was gained through purification. The basic zinc carbonate precursor was prepared using homogeneous precipitation employing the ZnSO4 solution as raw materials and the ammonium carbamate as precipitant, and the ultrafine ZnO powder was obtained by calcining the ZnO precursor. XRD, SEM and chemical components analysis were adopted to characterize the as-prepared precursor and the ZnO powder. The results show that the precursor was obtained since the OH- and HCO3- hydrolyzed from ammonia carbamate reacted with Zn2＋ in solution, which was calcinated to prepare the ZnO powder through the dehydration and decomposition. The precursor is basic zinc carbonate of Zn4（CO3）（OH）6.H20 with adhesive spheric particles, and the ZnO powder is of hexagonal wurtzite structure with uniform spheric size and good dispersity.

关 键 词：材料合成与加工工艺 中低品位氧化锌矿 低温焙烧 氧化锌粉体 

分 类 号：TQ127[化学工程—无机化工]