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Separation and recovery of Pd(II) and Pt(II) from cyanide liquors of Pd-Pt flotation concentrate via solvent extraction
- Source :
- Journal of Chemical Technology & Biotechnology. 92:1699-1709
- Publication Year :
- 2017
- Publisher :
- Wiley, 2017.
-
Abstract
- BACKGROUND Thus far, separation and recovery of Pd(CN)42- and Pt(CN)42- from cyanide liquors have not been reported. In this study, the process of co-extracting and separating Pd(II) and Pt(II) over Fe(III), Cu(I), Co(III), and Ni(I) from alkaline cyanide liquors was investigated. RESULTS The results showed that almost all Pd(II) and Pt(II) (>98.0%) could be simultaneously extracted by phenoxyethyl dimethyl palmitylammonium bromide (PDPB), whereas Fe(III), Cu(I), Co(III), and Ni(I) was below 3.0% under optimum conditions. Furthermore, Pd(CN)42- and Pt(CN)42- were separated and recovered by the two-step stripping process. First, Pd(CN)42- in mixed organic phase was stripped by a 2.0 mol L−1 ammonium thiocyanate solution. The stripping percentage of Pd(CN)42- was >98%, whereas the stripped Pt(CN)42- was below 1%. Second, more than 97.5% Pt(CN)42- in the loaded organic phase could be stripped using 1.0 mol L−1 thiodiglycol solution. Recovery ratios for both Pd(II) and Pt(II) were above 95%. The organic phase could be reused for at least 6 cycles of extraction–stripping processes. The mechanisms of extraction reaction were deduced to be ion-association mechanisms. CONCLUSION The process could be applied for extracting and separating palladium and platinum from the cyanide leaching liquor of the flotation concentrate. © 2016 Society of Chemical Industry
- Subjects :
- Stripping (chemistry)
Renewable Energy, Sustainability and the Environment
General Chemical Engineering
Cyanide
Organic Chemistry
Extraction (chemistry)
Inorganic chemistry
chemistry.chemical_element
02 engineering and technology
Thiodiglycol
021001 nanoscience & nanotechnology
Pollution
020501 mining & metallurgy
Inorganic Chemistry
chemistry.chemical_compound
Fuel Technology
0205 materials engineering
chemistry
Bromide
Ammonium thiocyanate
0210 nano-technology
Platinum
Waste Management and Disposal
Biotechnology
Palladium
Subjects
Details
- ISSN :
- 02682575
- Volume :
- 92
- Database :
- OpenAIRE
- Journal :
- Journal of Chemical Technology & Biotechnology
- Accession number :
- edsair.doi...........3913b03204f93134be8b6cc66083bc91