TY - JOUR
T1 - The effect of sulphur on tungsten recovery from scheelite concentrates by alkali fusion
AU - Şirin, Bülent
AU - Açma, Ercan
AU - Arslan, Cüneyt
AU - Addemir, Okan
PY - 1994/1/1
Y1 - 1994/1/1
N2 - A low-grade scheelite concentrate, obtained from Uludag Tungsten Plant (Bursa, Turkey), was used in this study. It contained approximately 35% WO3, 5.2% Sand 27% Fe. The optimum conditions of alkali fusion were: a temperature of 900°C, twice the stoichiometrically required Na2CO3, and 1 h treatment time. Tungsten was dissolved with a maximum efficiency at the end of 1 h of leaching with water at a solid/liquid weight ratio of 1/5 at 80aC under continuous stirring. A dissolution efficiency of 97% was obtained when the sulphur content of scheelite concentrate was decreased to 0.7% by roasting in a rotary furnace operating at 750°C and with 100% excess amount of air, while only 78% of tungsten dissolution efficiency could be reached when the original scheelite concentrate was not roasted prior to the alkali fusion. Phase analyses showed that the sulphur in concentrate has formed a matte phase as Na3FeS3 and confined some part of the tungsten as CaWO4, during the alkali fusion, and decreased its dissolution efficiency.
AB - A low-grade scheelite concentrate, obtained from Uludag Tungsten Plant (Bursa, Turkey), was used in this study. It contained approximately 35% WO3, 5.2% Sand 27% Fe. The optimum conditions of alkali fusion were: a temperature of 900°C, twice the stoichiometrically required Na2CO3, and 1 h treatment time. Tungsten was dissolved with a maximum efficiency at the end of 1 h of leaching with water at a solid/liquid weight ratio of 1/5 at 80aC under continuous stirring. A dissolution efficiency of 97% was obtained when the sulphur content of scheelite concentrate was decreased to 0.7% by roasting in a rotary furnace operating at 750°C and with 100% excess amount of air, while only 78% of tungsten dissolution efficiency could be reached when the original scheelite concentrate was not roasted prior to the alkali fusion. Phase analyses showed that the sulphur in concentrate has formed a matte phase as Na3FeS3 and confined some part of the tungsten as CaWO4, during the alkali fusion, and decreased its dissolution efficiency.
UR - http://www.scopus.com/inward/record.url?scp=0028524311&partnerID=8YFLogxK
U2 - 10.1179/cmq.1994.33.4.313
DO - 10.1179/cmq.1994.33.4.313
M3 - Article
AN - SCOPUS:0028524311
SN - 0008-4433
VL - 33
SP - 313
EP - 318
JO - Canadian Metallurgical Quarterly
JF - Canadian Metallurgical Quarterly
IS - 4
ER -