Abstract
Laboratory scale autoclave leaching of Uludag scheelite flotation concentrate containing 24.5% WO3 obtained from Etibank Corporation of Turkey was carried out. The effects of experimental parameters—amount and initial concentration of Na2CO3, temperature, particle size and time—on the recovery of WO3 were studied. The concentrate had to be heated to around 650°C initially to drive off the organic flotation chemicals. To achieve 99% WO3 recovery four limes the stoichiometric amount of Na2CO3 was necessary within four or five hours at 220°C. Lower temperatures and lower Na2CO3 amounts decreased the recovery. Highest recoveries were obtained with around 200 g/𝓁 initial Na2CO3 concentration. It was possible to leach the concentrate with +93% WO3 recovery using three times the stoichiometric Na2CO3 amount at 220°C when particle size was reduced. Iso-extraction contour diagrams were drawn to illustrate the effects of various parameters on leaching.
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