Vacuum Smelting Process for Producing Ferrotungsten-Description IV
- Details
- Category: Tungsten Information
- Published on Monday, 07 September 2015 17:51
When a metallic iron powder is employed as the iron-bearing constituent, the average particle size is not critical and may range from about 175 microns to about 74 microns, and preferably is controlled at an average particle size of about 125 microns to about 100 microns. When iron oxide is employed as the iron-bearing material, the iron oxide may suitably be introduced in the form of a fine-sized powder, preferably of an average particle size ranging from about 44 microns to about 10 microns. The iron oxide powder preferably comprises ferric oxide (Fe2 O3), which may be conveniently derived from sources such as millscale, a by-product of hot rolling steel, or the like. When all or a portion of the iron-bearing constituent is introduced in the form of an iron oxide compound, an appropriate amount of carbonaceous reducing material or reducing agent is incorporated in the mixture to effect a substantially complete reduction of the iron oxide to the corresponding metallic state.
In addition to the mineral concentrate and any iron-bearing material, if employed, the particulated mixture contains a fine-sized particulated carbonaceous reducing agent, of which carbon powder itself of an average particle size ranging from about 44 microns to about 10 microns constitutes the preferred material. The quantity of carbon or other carbonaceous reducing agent is employed in an amount at least equal to that stoichiometrically required to effect a substantially complete reduction of the tungsten oxide and any iron oxide present to the metallic state in accordance with the following typical reaction equations: WO3 + 3C ➝ W + 3CO 2Fe2 O3 + 6C ➝ 4Fe + 6CO
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