期刊
MINERALS ENGINEERING
卷 76, 期 -, 页码 135-140出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.mineng.2014.10.011
关键词
Platinum; Alkali metal; Double oxide; Calcium chloride; Hydrochloric acid; Dissolution property
资金
- Naito Science & Engineering Foundation
- Japan Science and Technology Agency (JST) [AS251Z02844M]
- [23656566]
To decrease the environmental load from current Pt recovery processes that use strong acids in combination with oxidizing agents, the dissolution of Pt in hydrochloric acid (HCl) by way of alkali metal platinates was examined. The alkali metal platinates, Li2PtO3, Na2PtO3, and a (Na,Li)(2)PtO3 solid solution, were prepared by calcining mixtures of Pt black and the alkali metal carbonates (Li,Na) at 600-800 degrees C in air. The dissolution of the resulting alkali metal platinates in HCl solutions was monitored by inductively coupled plasma-optical emission spectrometry. The results showed that Pt solubility approached 100% after choosing the appropriate calcination conditions. It was also found that by adding calcium chloride, the rate of Pt dissolution in dilute HCl significantly increased. The dissolution behavior of the alkali metal platinates was discussed based on the dissolution rates of the alkali metals and Pt ions, together with the crystal structures of the platinates. (C) 2014 Elsevier Ltd. All rights reserved.
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