We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Role of the reducing agent in tungsten extraction by chlorination with chlorine from an ore enriched by physical means.
- Authors
Menéndez, Carlos J.; Tavani, Eduardo L.
- Abstract
The effect of three reducing agents (sulphur dioxide, pyrite and carbon) on tungsten extraction from a scheelite-wolframite concentrate with chlorine gas was assessed. A low-grade ore (0.9% w/w WO3) was collected in the San Martín department, San Luis Province, Argentina, and subsequently enriched by physical means (65.73% w/w WO3). The minerals identified and their reactivities with chlorine were: scheelite (reactive), wolframite (reactive), pyrite (reactive), quartz (inert) and feldspars (inert). The metal recovered as WO2Cl2, with the different reagent combinations, was in increasing order: Cl2 + N2 < Cl2 + SO2 < pyrite + Cl2 + N2 < pyrite +Cl2 + SO2 < carbon + Cl2 + N2. It was proved that, according to its content, the pyrite initially present in the ore improves chlorination performance. At the same time, the non-volatile reaction products formed - CaCl2 and/or CaSO4 - and the manner of removing the nascent (desorbed) oxygen change depending on the reducing agent tested.
- Subjects
TUNGSTEN; CHROMIUM group; CHLORINATION; ORE sampling &; estimation; MINERALS
- Publication
REM - International Engineering Journal, 2022, Vol 75, Issue 4, p329
- ISSN
2448-167X
- Publication type
Article
- DOI
10.1590/0370-44672021750032