Vacuum Smelting Process for Producing Ferrotungsten-Description II

The tungstic oxide (WO3) constituent of the particulated mixture is introduced in the form of a finely-particulated tungsten containing mineral concentrate which preferably comprises predominately tungstic oxide. In accordance with conventional practices, tungstic oxide containing feed materials are commercially available as concentrates derived from various ore beneficiation processes to reduce the gangue and other contaminating constituents to concentrates usually containing at least 60%, and preferably at least 70%, tungstic oxide. Such beneficiation processes usually employ crushing, grinding, magnetic or gravity separation, flotation, or special chemical reactions to produce a particulated tungstic oxide concentrate. Common mineral sources containing tungsten oxide compounds which are suitable for producing concentrates for use in accordance with the practice of the present process include wolframite [(FeMn)WO4 ]; ferberite [FeWO4 ], which is the iron member of the wolframite family and contains some manganese; huebnerite [MnWO4 ], which is the manganese member of the wolframite family and contains some iron; and scheelite [CaWO4 ], which comprises essentially calcium tungstate.
 

The average particle size of the tungsten mineral concentrates for forming the mixture may range from about 10 microns to about 250 microns, while average particle sizes of from about 50 microns to about 125 microns are particularly satisfactory. Usually, beneficiation processes commercially employed effect a grinding or pulverizing of the mineral during the concentration process to an average particle size within the required range and no further supplemental grinding is required. However, in those instances in which the mineral concentrate is of an average particle size generally greater than about 250 microns, the concentrate is first subjected to a grinding operation to reduce its average particle size within the desired range.

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