Metall. Res. Technol.
Volume 116, Number 2, 2019
|Number of page(s)||4|
|Published online||25 January 2019|
Concentrating Pt from a spent alumina carrier catalyst by a roast-leach process
Kunming Institute of Precious Metals, Sino-platinum Metals CO., Ltd, State Key Laboratory of Advanced Technologies for Comprehensive Utilization of Platinum Metals,
650106, PR China
* e-mail: email@example.com
Accepted: 16 October 2018
A roast-leach process has been developed for concentrating platinum (Pt) from a spent Pt-Al2O3 catalyst. The effects of (NH4)2SO4 to spent catalyst mass ratio, roasting temperature and roasting time on the Pt enrichment factors were investigated. The results showed that the optimized roasting conditions were (NH4)2SO4 to spent catalyst mass ratio of 7.5, roasting temperature of 350 °C and roasting time of 5 h. The roasted product was mainly comprised of soluble NH4Al(SO4)2 and Al2(SO4)3 according to XRD analysis. The roasted product was leached in sulfuric acid to remove the soluble sulfates, and meanwhile Pt was kept in the residue. Under optimized conditions, a Pt concentrate with Pt content of 73.2% could be obtained from the spent catalyst with 0.27% Pt, and the corresponding Pt enrichment factor was more than 270.
Key words: platinum / spent catalyst / concentration / ammonium roasting / sulfuric acid leaching
© EDP Sciences, 2019
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