|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Rare Metal Extraction & Processing
||Purification of a Nigerian Wolframite Ore for Improved Industrial Applications
||Alafara Abdullahi Baba, Muhammed O Muhammed, Mustapha A Raji, Kuranga I Ayinla, Misitura Lawal, Folahan A Adekola, Abdul GF Alabi, Rafiu B Bale
|On-Site Speaker (Planned)
||Alafara Abdullahi Baba
Increasing demands for pure wolframite ore in the form of ammonium paratungstate (APT), tungsten oxide cannot be over emphasized. Thus, treatment of a Nigerian wolframite ore containing admixtures of scheelite (CaWO4 : 96-900-9631) and stolzite (PbWO4 : 96-900--9813) by hydrometallurgical route was investigated in hydrochloric acid chelated with phosphoric acid to extract tungsten via solvent extraction. During leaching, parameters such as leachant concentration, chelate dosage and reaction temperature on ore dissolution were examined. At optimal conditions (1.5 mol/L HCl+2.0 mol/L H3PO4 solution; 75°C), 95.0% of the initial 10g/L ore reacted within 120 minutes. The derived activation energy of 23.43kJ/mol supported the proposed dissolution mechanism. The unreacted product analyzed by XRD was found to contain siliceous impurities. Tungsten recovery from leachate was carried out by solvent extraction with Aliquat 336 in kerosene. Pure tungsten was recovered as APT and beneficiated to produce high grade tungsten oxide of industrial values.