Abstract
The demand for noble metals is increasing, owing to their excellent chemical and physical properties. In order to meet the demand, the recovery of noble metals with high purity from diverse secondary resources, which contain small amounts of noble metals, is of immense value. In this work, the possibility of the separation of Au(III), Pd(II), Pt(IV), Rh(III), and Ir(IV) by solvent extraction from a synthetic HCl solution is investigated. Only Au(III) was selectively extracted by Cyanex 272 in the HCl concentration range from 0.5 M to 9 M, leaving the other metal ions in the raffinate. The loaded Au(III) in Cyanex 272 was efficiently stripped by (NH2)2CS. The other four noble metals were sequentially separated on the basis of the procedures reported in the previous work. The mass balance showed that about 98% of each metal, except Pt(IV), was recovered by the proposed process. An efficient process for the recovery of the five noble metal ions from the HCl leaching solution of secondary resources containing these metals can be developed.
Highlights
Noble metals are indispensable for the manufacture of advanced materials, which are employed in the automobile, chemical, electronic, and medical industries, owing to their excellent chemical and physical properties [1,2]
A solvent extraction process was developed for the separation of noble metals from concentrated hydrochloric acid solutions containing Au(III), Pd(II), Pt(IV), Rh(III), and Ir(IV)
In the process proposed in this work, Au(III), Pd(II), Pt(IV), Ir(IV), and Rh(III) were sequentially separated by solvent extraction
Summary
Noble metals are indispensable for the manufacture of advanced materials, which are employed in the automobile, chemical, electronic, and medical industries, owing to their excellent chemical and physical properties [1,2]. Many processes have been proposed for the recovery of noble metals from secondary resources [1]. Since the contents of noble metals in the secondary resources are very low, smelting of these secondary resources together with other metal ores is effective in recovering noble metals. Diverse secondary resources containing noble metals can be treated by a smelting operation in a copper smelter when the secondary resources do not contain components harmful to the operation of copper smelting. Anode slimes are produced from the electro-refining of the impure anodes, which contain most of the noble metals present in the ores, as well as the secondary resources. It is important to develop an efficient process to recover noble metals with high purity from the anode slimes
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