韓国半島鉱業産モリブデナイト鉱石中のCu, Pb, Biの浮選除去

抄録

Molybdenite ore at Bando Mining Company in South Korea contains chalcopyrite, galena and bismuthinite as impurities. For the reason of metallurgical procedures, high grade flotation concentrate of Molybdenite has been demanded, and impurities such as Cu, Pb, Bi and W must be extremely low, for example Cu<0. 3%, WO₃<0. 03% and Pb< 0.05%.
Flotation tests were carried out for the purpose of producing the concentrate that contains Cu <0. 1%, Bi<0. 1% and Pb<0. 05%, and that the grade of MoS₂ was over 85%. As the results of a series of flotation tests, we obtained the most satisfactory results by adopting the hot water conditioning by using Na₂SO₃ only or in combination with KCN and Na₂S. It was recognized that the depressant action of of Na₂SO₃ was very effective to bismuthinite and galena, when conditioning treatment was done at high water temperature, inspite of its low effect at room temperature.