摘要
以国内某制药企业使用过的废钯炭催化剂为原料,研究了用王水溶解-氯化铵直接沉淀法回收钯的新工艺,取代了传统的王水溶解-氨水配合法。新工艺实现了钯和贱金属的有效分离,贵贱金属分离效果好,大幅度缩短了生产周期,降低了生产成本,提高了生产效率。经过10批次的实际生产验证,钯的平均直收率为99.20%,平均总收率为99.94%。采用氯气微压催化溶解钯的新工艺制备二氯化钯,保证了产品中无硝基,质量稳定、操作简单、环境更友好。
Palladium was recovered from spent Pd/C catalysts by dissolution with HNO3 and selective pre- cipitation with NHaC1. The process has advantages over the conventional HNO3 -NH3 · H2O recovery method. The advantages include effective separation of palladium from base metals, short recovery cycle and low cost. Based on ten batches of recovery operation, the average total recovery rate was found to be 99.94% with direst recovery of 99.20%. PdCl2 was prepared by catalyzing chlorination of palladium powder under micro - pressure. This preparative process can produce PdCl2 of stable quality free from ni- trate in an environmentally friendly manner
出处
《贵金属》
CAS
CSCD
北大核心
2012年第4期9-13,共5页
Precious Metals
基金
国家高技术研究发展计划(863计划)项目(2012AA063204
2012AA063207
2012AA063203)
云南省科技创新强省计划项目资助(2011AA004)
国家科技支撑计划课题(2012BAE06B08)
关键词
冶金技术
失效催化剂
钯
回收
二氯化钯
metallurgy
spent Pd/C catalysts
palladium
recovery
palladium chloride
