Recovery of Tungsten and Molybdenum from Low-Grade Scheelite

With most high-quality tungsten ores being exhausted, the enhancement of low-grade scheelite concentrates processing has attracted a great deal of attention. The objective of this study is to develop a method to maximize the recovery tungsten and molybdenum from a low-grade scheelite via a new acid...

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Bibliographic Details
Published in:JOM (1989) 2017-10, Vol.69 (10), p.1958-1962
Main Authors: Li, Yongli, Yang, Jinhong, Zhao, Zhongwei
Format: Article
Language:English
Subjects:
Acid leaching
Chemistry/Food Science
Concentrates (ores)
Cross flow
Decomposition
Earth Sciences
Efficiency
Engineering
Environment
Experiments
Extraction processes
Kerosene
Leaching
Materials science
Methods
Minerals
Molybdenum
Octanol
Physics
Quality
Reagents
Scheelite
Solvent extraction
Solvent extraction processes
Sulfuric acid
Tungsten ores
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Summary:With most high-quality tungsten ores being exhausted, the enhancement of low-grade scheelite concentrates processing has attracted a great deal of attention. The objective of this study is to develop a method to maximize the recovery tungsten and molybdenum from a low-grade scheelite via a new acid leaching process followed by solvent extraction. Under optimal conditions (350 g/L H 2 SO 4 , 95°C, and 2 h), approximately 99.8% of tungsten and 98% of molybdenum were leached out. In the subsequent solvent extraction process, more than 99% of the tungsten and molybdenum were extracted with a co-extraction system (50% TBP, 30% HDEHP, and 10% 2-octanol in kerosene) using a three-stage cross-flow extraction. The raffinate can be recycled for the next leaching process after replenishing the H 2 SO 4 to the initial value (approximately 350 g/L). Based on these results, a conceptual flowsheet is presented to recover tungsten and molybdenum from the low-grade scheelite.
ISSN:1047-4838
1543-1851
DOI:10.1007/s11837-017-2440-5