Vacuum Smelting Process for Producing Ferrotungsten-Description IX

The heating of the pelletized charge to within the desired temperature range is achieved at a rate as quickly as possible without incurring fracture or rupture of the pellets due to the rapid gasification of any moisture and other volatile constituents therein including the binder constituent, thereby producing pellets of a porous nature which become progressively more porous as the vacuum smelting reaction proceeds until a temperature is attained at which some sintering and densification of the pellets occurs. When iron oxide is employed in the pelletized feed stock as the source of the iron-bearing material, the reduction of iron oxide takes place commencing at a temperature of about 1800° F. and is accompanied by a liberation of carbon monoxide gas. A reduction of the tungsten oxide constituent takes place commencing at a temperature of about 1800° F. and the reaction itself is carried out for a period of time sufficient to effect a substantially complete reduction of the tungsten oxide constituent and of any iron oxide present to the metallic state. As metallic tungsten is produced during the course of the vacuum smelting reaction, the initial iron constituent present or the metallic iron produced by the reduction of the iron oxide constituent becomes alloyed with the tungsten, producing a nonsegregated substantially dense pellet of ferrotungsten alloy. Upon completion of the vacuum smelting operation, the pelletized charge is permitted to cool to a temperature below about 300° F. whereafter the dense ferrotungsten alloy product can be extracted and exposed to air such as by back-filling the vacuum smelting furnace and the product recovered.

In order to further illustrate the process comprising the present invention, the following examples are provided. It will be understood that the examples hereinafter set forth are provided for illustrative purposes and are not intended to be limiting of the invention as herein described and as defined in the subjoined claims.

 

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