Vacuum Smelting Process for Producing Ferrotungsten-Description VII

In accordance with a typical processing sequence, the tungsten containing particulated mineral concentrate is blended with an appropriate quantity of a powdered carbonaceous reducing agent in addition to a desired quantity of supplemental iron powder and/or iron oxide, whereafter appropriate quantities of binder are added. The resultant mixture is agglomerated into pellets of the desired size and shape and the green pellets are subsequently dried and transferred to a pellet storage hopper. The resultant pellets can be charged to a vacuum smelting furnace either on a batchwise basis or on a continuous basis, as may be desired, to effect a heating thereof to an elevated temperature in the absence of oxygen and under a relatively high vacuum so as to effect a direct reduction of the tungsten oxide constituents and any iron oxide constituents present and an extraction of the volatile contaminating constituents including the gaseous reaction products of the oxidized carbonaceous reducing agent, such as in the form of carbon monoxide. The vacuum furnace may suitably be evacuated employing a vacuum pump which preferably is of a steam ejector type and also effects a transfer of the vaporized constituents through suitable condensers for effecting a selected recovery thereof as by-products.

 

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