HYDROMETALLURGICAL PRODUCTION OF TECHNICAL GRADE MOLYBDIC OXIDE FROM MOLYBDENITE CONCENTRATES

摘要

ABSTRACTAn improved hydrometallurgical method is providedfor producing technical grade molybdic oxide from molybdeniteconcentrates. According to this method, the molybdeniteconcentrates are leached in an acid medium having a nitricacid concentration between about 25 gpl and about 50 gpl andan initial sulphuric acid concentration of nil to about 750gpl, under oxygen pressure of about 100 - 250 psig and at atemperature above 115°C so as to produce technical grademolybdic oxide having not more than 0.1% sulphur. Then aliquid-solid separation of the reaction mixture is effectedand the obtained leach liquor is recycled back to the leachingstage optionally after partial neutralization with a basicreagent. The solid is washed and recovered as technical grademolybdic oxide and the wash waters are treated to removerecoverable metal values therefrom.