Enhanced dissolution of alkali metal platinates in dilute hydrochloric acid by addition of calcium chloride

被引：11

作者：

Kasuya, Ryo ^{[1
]}

Mild, Takeshi ^{[1
]}

Morikawa, Hisashi ^{[1
]}

Tai, Yutaka ^{[1
]}

机构：

[1] Natl Inst Adv Ind Sci & Technol, Moriyama Ku, Nagoya, Aichi 4638560, Japan

来源：

MINERALS ENGINEERING | 2015年 / 76卷

基金：

日本科学技术振兴机构;

关键词：

Platinum; Alkali metal; Double oxide; Calcium chloride; Hydrochloric acid; Dissolution property;

D O I：

10.1016/j.mineng.2014.10.011

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

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.

引用

页码：135 / 140

页数：6

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