MOLYBDENITE CONCENTRATE PROCESSING WITH USING LOW-TEMPERATURE OXIDATION-CHLORIDIZING ROASTING

Caused by roasting temperature decrease down to 450 °С and formation of water-soluble molybdenum compounds during roasting, the perspectiveness of application of oxidation-chloridizing roasting with alkali metal chlorides for molybdenite concentrate processing is shown. It is established that ~60÷75 % molybdenum remains in the roasted product and another amount is chlorinated and sublimated as a part of chlorides and oxychlorides and entrapped practically in full in the settling chamber and absorbers. The chemistry of the processes proceeding during oxidation-chloridizing roasting is described; it allows us to explain the molybdenite oxidation temperature decrease from 550-600 °С to 450 °С. Optimum process conditions of roasted products by water and alkali solutions have been determined, on the basis of what a basic process flow diagram including oxidation-chloridizing roasting with sodium chloride, two-stage (water and alkaline) leaching as well as dissolution of condensed molybdenum oxides and oxychlorides concentrates is proposed for molybdenite concentrate processing. The given flow sheet allows processing conditioned molybdenite concentrates with molybdenum recovery into solutions no less than 98 %.

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