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Vol.17, No.6, 447 ~ 455, 1979

Title

Study on the Soda Roasting for Low Grade molybdenum oxides

정종희J . H . Chung, 성장현J . H . Sung, 김재호J . H . Kim, 황용길Y . K . Whang

Abstract

A study on the leaching of the molybdenite from the soda roasted ore obtained by the oxidizing roasting of the mixtures of molybdenite and bismuthinite has been made. To determine the oxidizing roasting temperature of mixed sulphide ore and the soda roast ing temperature of oxidizing roasted ore, and also to identify those compounds, the differential thermal analysis and X-ray diffraction analysis have been performed. The results obtained are as follows. The suitable soda roasting temperature of oxidizing roasted ore was in the range from 500℃ to 700℃ and the oxidizing roasted ore has been found to be composed of γ-Bi₂O₃, MoO₃and Bi₂MoO_6. The leaching rate of the soda roasted ore mixed with caustic soda has shown to be greater by more than 8% as comparted to that of the soda roasted ore mixed with the soda ash. The recovery of soda roasted ore mixed with caustic soda has been determined to be 93% at the soda roasting temperature of 700℃. The concentrated leaching residues have been found consisting of γ-Bi₂O₃and Bi₂MoO_6.

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