New recovery process for rhodium using metal vapor
New recovery process for rhodium using metal vapor
复制标题
利用金属蒸气回收铑的新工艺
DOI：
10.1016/s0925-8388(03)00666-2
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发表时间：
2004
期刊：
影响因子：
--
通讯作者：
M. Maeda
中科院分区：
文献类型：
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作者：
Y. Kayanuma;T. Okabe;Y. Mitsuda;M. Maeda
铑（Rh）是汽车催化转换器中催化剂的重要元素，从废料中回收Rh是一个重要问题。然而，Rh 的化学惰性使其很难从废料中回收。本研究重点关注从废料中回收铂族金属 (PGM) 的新工艺，旨在改善 Rh 在酸中的溶解度。镁 (Mg) 和钙 (Ca) 等活性金属蒸气与粉末状 Rh 在密闭不锈钢反应容器中在 873 至 1173 K 的恒温下发生反应。在高于 973 和 1073 K 的温度下，Mg 和 Ca 分别沉积在 Rh 上。使用HCl水溶液或王水在323-333 K下进行所得化合物的溶解实验1小时。活性金属处理后，99%的Rh被王水浸出溶解。在相同的浸出条件下，未经处理的纯Rh粉仅溶解了8%。使用沉淀法或胶结法从浸出镁反应Rh化合物获得的溶液中回收Rh，证明了这种回收的可行性。这些结果表明利用反应性金属蒸气处理开发新的铑回收工艺的可能性。
Rhodium (Rh) is an essential element as a catalyst in automotive catalytic converters, and the recovery of Rh from scrap is an important issue. However, the chemical inertness of Rh makes it difficult to recover it from scrap. This study focused on a new process for recovering platinum group metals (PGM) from scrap with the purpose of improving Rh dissolution in acid. Reactive metal vapors such as magnesium (Mg) and calcium (Ca) were reacted with powdered Rh in a closed stainless steel reaction vessel at a constant temperature ranging from 873 to 1173 K. Mg and Ca deposited on Rh at temperatures above 973 and 1073 K, respectively. Dissolution experiments of the obtained compounds were conducted at 323–333 K for 1 h using an aqueous HCl solution or aqua regia. After reactive metal treatment 99% of Rh was dissolved by aqua regia leaching. Under the same leaching condition only 8% of the untreated pure Rh powder was dissolved. Rh was recovered from the solution obtained by leaching Mg reacted Rh compound using precipitation or cementation methods, demonstrating the feasibility of such recovery. These results show the possibility of developing a new Rh recovery process utilizing reactive metal vapor treatment.