In addition to the tungsten containing mineral concentrate, the mixture may further contain controlled amounts of an iron-bearing material which may comprise a finely-divided iron powder or an iron oxide powder present in a controlled amount so as to adjust the total iron concentration in the particulated mixture to produce a resultant ferrotungsten alloy having the desired iron content. Ferrotungsten alloys usually contain iron concentrations of from about 0.2% up to about 20%. When employing mineral concentrates derived from wolframite or ferberite, which inherently contain iron concentrations of from about 10% to as high as about 20%, the addition of a supplemental iron bearing material to the particulated mixture is normally not required. However, when employing mineral concentrates derived from heubnerite or scheelite, or when higher iron concentrations are desired in the resultant ferrotungsten alloy, the mixture can be supplemented by the addition of a metallic iron powder or iron oxide powder, as well as a mixture thereof to provide the requisite iron concentration. When the mixture contains an excessive concentration of iron, a controlled amount of iron can be removed by volatilization during the vacuum smelting operation by employing temperatures in the upper portion of the permissible temperature range.
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