title: Purification of sulphate leach liquor of spent Raneynickel catalyst containing Al and Ni by solvent extraction with organophosphorus-based extractants.
abstract: Solvent extraction (SX) separation of Al from Ni sulphate leach liquor (LL) of spent Raneynickel catalyst containing 0.12 M Al and 1.448 M Ni using organophosphorus extractants has been investigated. Optimization of process conditions includes aqueous pH, extractant concentration, phase ratio, and stripping. Comparison of Al extraction efficiency with 0.45 M extractant concentration for TOPS 99, PC 88 A, and Cyanex 272 at an equilibrium pH of 2.23 was 81.8%, 98.6%, and 75%, respectively. The corresponding coextraction of Ni was 0.65, 0.6, and 0.9. Among the three extractants screened, PC 88A showed better extraction efficiency for Al at lower pH values than the others. Using 0.45 M PC 88 A, extraction isotherm was obtained at an aqueous-to-organic (A : O) phase ratio of 1 : 1-3 and O : A ratio of 1 : 1-5, which predicted possible separation of Al in 2 stages at A/O ratio of 2. Quantitative stripping was achieved by H(2)SO(4).
authors.affiliation: Urban Mining Research Team, Korea Institute of Geosciences and Minerals Resources (KIGAM), Yuseong-gu, Daejeon, Republic of Korea.
authors.forename: Satunuri Venkateswar
authors.initials: SV
authors.lastname: Rao
authors.forename: Dong Hyo
authors.initials: DH
authors.lastname: Yang
authors.forename: Jeong Soo
authors.initials: JS
authors.lastname: Sohn
authors.forename: Soo-Kyung
authors.initials: SK
authors.lastname: Kim
mesh_terms: D000535:Aluminum / Q000737:chemistry / Q000302:isolation & purification*; D002384:Catalysis; D003377:Countercurrent Distribution; D006863:Hydrogen-Ion Concentration; D009532:Nickel / Q000737:chemistry / Q000302:isolation & purification*; D009943:Organophosphorus Compounds / Q000737:chemistry*; D012997:Solvents
chemical_list: D009943:Organophosphorus Compounds; D012997:Solvents; D009532:Nickel; D000535:Aluminum