Study on separation of molybdenum from molybdenum-containing copperconcentrate by oxidizing roasting-leaching
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Abstract:
An oxidizing roasting-leaching flowsheet was proposed to further separate molybdenum because of complex minerals composition and tightness paragenetic relationship of molybdenum and copper in the molybdenum-containing copper concentrate in western Panzhihua of Sichuan province. Samples were put into the roasting furnace to conduct oxidizing roasting, and sulphide ore was oxidized into CuO, MoO3, Fe2O3, etc. Then, NaOH and H2O were added to react with MoO3, and Na2MoO4 was produced, and leaching residue was taken as the copper concentrate. Study results indicate that copper and molybdenum occur in the form of oxide in the roasting ores. The sulfur content is 0.53% in the roasting ores, and sulfur volatilizes in the form of SO2. The leaching ratio of molybdenum is 94.24% and the copper mass fraction in the copper concentrate(leaching residue) is 24.27% when the roasting temperature is 650℃, roasting time is 120 min, NaOH dosage is 30%, leaching temperature is 60℃, leaching time is 120 min, and leaching liquid-solid ratio is 2:1. The effect of molybdenum separation is obvious.
