银精矿加石灰焙烧过程中银的化学物相变化  

Chemical phase changes of silver in lime roast prosess of silver-gold concentrate

作　　者：徐盛明[1] 池汝安[1] 徐景明[1] 朱国才[1] 张传福[2] 

机构地区：[1]清华大学核能技术研究院,北京102201 [2]中南大学冶金科学与工程系,长沙410083

出　　处：《中国有色金属学报》2001年第4期726-730,共5页The Chinese Journal of Nonferrous Metals

基　　金：中国博士后科学基金(中博基 [1999] 17号 );国家自然科学基金资助项目 ( 5 0 0 740 2 0 );原中国有色金属工业测试基金资助课题

摘　　要：采用化学物相分析方法 ,定量研究了石灰和焙烧气氛对银精矿加石灰焙烧过程中银的化学物相及其相对含量变化的影响 ,并借助热力学分析手段初步探讨了石灰在主要载银矿物的氧化、解离过程中的作用机制。结果表明 :添加石灰能够大大地降低焙砂中的氧化物包裹银含量 ,如焙烧 2h后的氧化物包裹银含量由直接焙烧时的 11.0 8%降到有石灰存在时的 4 .15 % 。In order to explain the fact that lime roasting process (LRP) can evidently improve silver leaching yield, the influences of lime and roasting atmosphere on chemical silver phase types and their contents in the LRP of silver concentrate were studied quantificationally by chemical phase analytical method. The action of lime on oxidation and dissociation of silver existed minerals was also discussed primarily in virtue of thermodynamics calculations. The results show that amount of silver encapsulated in oxides of a calcine can be reduced obviously from 11.08% in the absence of lime to 4.15% in the presence of lime when roasting time is equal to 2?h, and is regardless of air or oxygen riched atmosphere.

关 键 词：银精矿 石灰焙烧 银 化学物相 炼银 

分 类 号：TF832[冶金工程—有色金属冶金]