摘要
采用流态化浸出技术研究了从环氧乙烷用失效银催化剂中银的工艺。考察了流化状态、硝酸用量、反应时间等参数对银浸出效果的影响,得到了最佳工艺条件。采用自制流化态溶解装置,使废催化剂处于流动翻滚状态,硝酸用量为理论用量的1.2倍,反应时间不低于1 h,银的浸出率可达到99.88%。浸出液氯化沉淀后采用传统方法精炼提纯,得到99.95%纯度的银。
For the recovery of silver from spent catalyst used in ethane oxide industry, fluidization technique was introduced to accelerate the leaching of silver from spent catalyst. The influencing parameters on the leaching, such as flow state and nitric acid dosage and reaction time, were studied in order to obtain the optimum process conditions. A 99.88%of the silver leaching rate could be achieved within 1 h when the spent catalyst was in fluid state in a special reactor containing a nitric acid amount 1.2 times as the theoretical one. The silver in the leaching solution was purified by conventional AgCl precipitating method to reach a purity of 99.95%.
出处
《贵金属》
CAS
CSCD
北大核心
2016年第2期41-45,共5页
Precious Metals
基金
国家高技术研究发展计划(863计划)项目(2012AA063203)
云南省省院省校科技合作项目(2013IB020)
关键词
冶金技术
失效催化剂
银
回收
流态化
metallurgy
spent catalyst
silver
recovery
fluidization
