摘要
研究了采用氧化焙烧—还原—氯化浸出工艺流程从失效催化剂中回收钯,考察了焙烧温度、焙烧时间、还原剂种类及用量、氧化剂种类、盐酸浓度等对钯浸出率的影响。试验结果表明,失效催化剂在575℃下焙烧2h,控制还原剂水合肼(N2H4·H2O)用量为2.5g/L,以氯酸钠(NaClO3)作氧化剂(用量为3.0g/L),用5mol/L的盐酸进行浸出,钯浸出率在98%以上,二段浸出后,钯总回收率达99%以上。
The recovery of palladium from spent catalyst by the process of oxidation roasting-reducing- leaching using hydrochloric acid was studied. The effects of roasting temperature and time, type and usage of reducing agent and oxidizing agent, HCl concentration on leaching rate of palladium were examined. The resuhs show that the leaching of palladium is more than 98% under the conditions of roasting temperature of 575℃and roasting time of 2 h,reducing agent N2H4 · H2O concentration of 2.5 g/L,oxidation agent NaClO3 concentration of 3.0 g/L, HC1 concentration of 5 mol/L. The overall recovery of palladium is over 99% by two-stage leaching.
出处
《湿法冶金》
CAS
北大核心
2017年第1期41-45,共5页
Hydrometallurgy of China
基金
国家自然科学基金资助项目(No.51574284)
国家青年自然科学基金资助项目(No.51504293)
云南省校科技合作项目(No.2013IB020)
中南大学贵重仪器设备开放共享基金资助项目(CSUZC201606)
关键词
废催化剂
钯
氧化铝
回收
氯化浸出
spent catalyst
palladium
aluminum oxide
recovery
