Separation of Molybdenum from Acidic High-Phosphorus Tungsten Solution by Solvent Extraction

A solvent-extraction process for deep separation of molybdenum from an acidic high-phosphate tungsten solution was developed using tributyl phosphate (TBP) as the extractant and hydrogen peroxide (H 2 O 2 ) as a complexing agent. The common aqueous complexes of tungsten and molybdenum (PMo x W 12−x...

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Bibliographic Details
Published in:JOM (1989) 2017-10, Vol.69 (10), p.1920-1924
Main Authors: Li, Yongli, Zhao, Zhongwei
Format: Article
Language:English
Subjects:
Chemistry/Food Science
Depolymerization
Dosage
Earth Sciences
Efficiency
Engineering
Environment
Equilibrium
Experiments
Hydrogen peroxide
Materials science
Molybdenum
Phosphorus
Physics
Reagents
Separation
Solvent extraction
Solvent extraction processes
Solvents
Steel production
Sulfuric acid
Tungsten
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Summary:A solvent-extraction process for deep separation of molybdenum from an acidic high-phosphate tungsten solution was developed using tributyl phosphate (TBP) as the extractant and hydrogen peroxide (H 2 O 2 ) as a complexing agent. The common aqueous complexes of tungsten and molybdenum (PMo x W 12−x O 40 3− , x  = 0–12) are depolymerized to {PO 4 [Mo(O) 2 (O–O)] 4 } 3− and {PO 4 [W(O) 2 (O–O)] 4 } 3− by H 2 O 2 . The former can be preferentially extracted by TBP. The extractant concentration, phase contact time, H 2 O 2 dosage, and H 2 SO 4 concentration were optimized. By employing 80% by volume TBP, O:A = 1:1, 1.0 mol/L H 2 SO 4 , 1.0 mol/L H 3 PO 4 , a contact time of 2 min, and a molar ratio of H 2 O 2 /(W + Mo) equal to 1.5, 60.2% molybdenum was extracted in a single stage, while limiting tungsten co-extraction to 3.2%. An extraction isotherm indicated that the raffinate could be reduced to
ISSN:1047-4838
1543-1851
DOI:10.1007/s11837-017-2329-3