Extraction of Sodium Tungstate from Tungsten Ore by Pyrometallurgical Smelting
Open Access
Abstract
Tungsten is one of the strategic metals produced from tungsten ores through sodium tungstate. The hydrometallurgical process is a common technology for extracting sodium tungstate from high-grade tungsten concentrates. The grade of tungsten ore is decreasing, and the mineral processing to produce a high-grade concentrate suitable for the hydrometallurgical process is becoming more difficult. It is desirable to develop a new technology to effectively recover tungsten from the complex low-grade tungsten ores. A fundamental study on the pyrometallurgical processing of wolframite was carried out through thermodynamic calculations and high-temperature experiments. The wolframite was reacted with Na2CO3 and SiO2 at 1050–1200 °C and then leached with water to obtain a sodium tungstate solution as a feed for the traditional process of APT (Ammonium paratungstate). The factors affecting the extraction rate of tungsten from wolframite were investigated in air and neutral atmosphere. The extraction rate of tungsten was found to increase with increasing Na2O content and decrease with increasing SiO2 addition and temperature. The extraction rate in argon was higher than that in air for wolframite.Keywords
This publication has 14 references indexed in Scilit:
- Vacuumless synthesis of tungsten carbide in a self-shielding atmospheric plasma of DC arc dischargeInternational Journal of Refractory Metals and Hard Materials, 2020
- Computational Search for New W–Mo–B CompoundsChemistry of Materials, 2020
- WB5−x: Synthesis, Properties, and Crystal Structure—New Insights into the Long‐Debated CompoundAdvanced Science, 2020
- 11th International Symposium on High-Temperature Metallurgical ProcessingThe Minerals, Metals & Materials Series, 2020
- Computational discovery of hard and superhard materialsJournal of Applied Physics, 2019
- Sustainability evaluation of essential critical raw materials: cobalt, niobium, tungsten and rare earth elementsJournal of Physics D: Applied Physics, 2018
- Reprint of: FactSage thermochemical software and databases, 2010–2016Calphad, 2016
- Extracting tungsten from scheelite concentrate with caustic soda by autoclaving processHydrometallurgy, 2011
- Decomposing scheelite and scheelite-wolframite mixed concentrate by caustic soda digestionJournal of Central South University of Technology, 2003
- Beneficiation of tungsten ores in India: A reviewBulletin of Materials Science, 1996