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| 从钯银合金废料中回收钯的实验研究 |
| Study on Recovery of Pd from Pd-Ag Alloy Scrap |
| Received:August 10, 2017 |
| DOI： |
| 中文关键词: 钯 钯银合金 废料 回收 |
| 英文关键词: palladium Pd-Ag Alloy scrap recovery |
| 基金项目: |
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| 中文摘要: |
| 以钯银合金废料为原料，采用硝酸溶解-盐酸沉银-二氯二氨络亚钯法提纯-水合肼还原工艺回收钯。结果表明，当浓盐酸用量为2 mL/200 mL混合酸液，反应时间1 h时，银沉淀率为99.98%；当氨络合和盐酸酸化沉淀过程溶液最佳pH分别为8和1.5，并经温水洗涤3次，二氯二氨络亚钯纯度达到99.99%以上；该工艺钯回收率大于90%，并制得纯度大于99.99%的海绵钯，其平均粒径不大于0.5 μm。 |
| 英文摘要: |
| Palladium was recovered by the process of dissolution with nitric acid, precipitation of AgNO3 with hydrochloric acid, purification of Pd with the method of dichloro-diammine palladium and reduction with hydrazine hydrate from Pd-Ag alloy scrap. The results show that when the amount of hydrochloric acid is 2 mL/200 mL mixed acid solution and the reaction time of 1h, the precipitation rate of Ag reaches 99.98%. When the optimum solution pH are controlled at 8 and 1.5 respectively during the process of ammonia complexation and hydrochloric acid acidification precipitation, the purity of dichloro-diammine palladium washed by warm water 3 times reaches more than 99.99%. The recovery rate of palladium of the whole process is greater than 90% and sponge palladium of which purity greater than 99.99% and average particle size no lager than 0.5 μm is prepared. |
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