用氢氧化钠从银渣中浸出硒碲试验研究  

Leaching of Selenium and Tellurium From Silver Residue Using Sodium Hydroxide

作　　者：熊庆丰 范兴祥[2,3] 余宇楠[2,3] 刘琼 刘振楠[2,3] 姚春玲[2,3] XIONG Qingfeng FAN Xingxiang YU Yu＇nan LIU Qiong LIU Zhennan YAO Chunling(Sino-platinum Metals Co. ,Ltd. ,Kunming 650106,China Metallurgy ＆ Material Engineering Faculty, Kunming Metallurgy College,Kunming 650033,China The National Renewable Metal Industry Key Laboratory of Recycling Rare and Precious Metals Secondary Resources, Kunming 650033,China)

机构地区：[1]贵研铂业股份有限公司,云南昆明650106 [2]昆明冶金高等专科学校冶金材料学院,云南昆明650033 [3]全国再生金属行业稀散及贵金属二次资源循环利用重点实验室,云南昆明650033

出　　处：《湿法冶金》2017年第4期281-284,共4页Hydrometallurgy of China

基　　金：昆明冶金高等专科学校引进人才科研经费资助项目(2015RC001)

摘　　要：银渣主要含银、硒及少量铁、铜、铋、锑、碲、铅等,硒以亚硒酸银形式存在。研究了用氢氧化钠从银渣中选择性浸出硒、碲,考察了浸出时间、反应温度、液固体积质量比、氢氧化钠浓度对硒、碲浸出率的影响。试验结果表明:氢氧化钠浓度和液固体积质量比对硒、碲浸出率影响较大,硒和部分碲被浸出,其他元素如银、铜、铁等及部分碲留在渣中,浸出过程具有选择性;在反应温度95℃、液固体积质量比4∶1、氢氧化钠初始质量浓度200g/L、搅拌速度250r/min条件下浸出4h,硒、碲浸出率分别为97.22%和36.75%。此外,也研究了用硝酸浸出碱浸渣中的银。浸出渣衍射分析结果表明,渣中残留的硒主要以亚硒酸钠形式存在,需要用氢氧化钠再次浸出。The silver residue contains silver, selenium, tellurium and a small amount of iron, copper, bismuth,antimony and lead. Selenium in the slag exists in the form of silver selenite. The selective leaching of selenium and tellurium from the silver residue using sodium hydroxide was researched. The effects of leaching time, temperature, liquid to solid ratio and sodium hydroxide concentrate on leaching of selenium and tellurium were examined. The results show that sodium hydroxide concentration and liquid-to-solid ratio have significant influence on leaching of selenium and tellurium. Other elements such as silver,copper,iron and part of tellurium are remained in the leaching slag. The leaching process can selective leach for selenium and tellurium. Under the conditions of leaching time of 4 h,leaching temperature of 95℃ ,liquid-to-solid ratio of 4 = 1 ,concentration of sodium hydroxide of 200 g/L and stirring speed of 250 r/min,the leaching rate of selenium and tellurium are 97.22% and 36.75 % ,respectively. The silver in the leaching slag of sodium hydroxide is leached using nitric acid solution. A small amount of selenium in the acidic leaching residue mainly exists in the form of sodium selenite which still needs leaching again using sodium hydroxide.

关 键 词：银渣 碱 浸出 硒 碲 

分 类 号：TN304.1[电子电信—物理电子学]