Vacuum Smelting Process for Producing Ferrotungsten-Description V
- Details
- Category: Tungsten Information
- Published on Monday, 07 September 2015 17:53
Preferably, the carbon reducing agent is employed in excess of that stoichiometrically required and is usually controlled within a stoichiometric ratio of from about 1.05 to about 1.20 times that theoretically required. Amounts of carbon above about 20% in excess of that stoichiometrically required are undesirable due to the retention of excessive carbon in the resultant ferrotungsten alloy pellets, rendering them less desirable as an alloying addition agent in some instances. It is also contemplated that small percentages of the carbonaceous reducing agent, such as carbon, can be incorporated when the iron bearing material comprises metallic iron powders for the purpose of reducing any oxides present on the iron particle surfaces. Generally employing the carbonaceous reducing agent in amount up to about 1% of the iron-bearing material employed is effective for this purpose and provides for ferrotungsten alloys of relatively high purity.
The mineral concentrate, the carbonaceous reducing agent and any supplemental iron-bearing constituent are blended mechanically in appropriate proportions to form a substantially homogeneous or uniform blend. It is important that the particulated mixture is first agglomerated into briquettes or pellets of a size which facilitates their handling and also assures the formation of a porous bed to permit an escape of the volatile constituents and gaseous reaction products of the oxidized reducing agent from the agglomerates during the vacuum smelting operation. The particular configuration and size of the pellets are not critical, and to some extent, will be dictated by the particular type of agglomerating process and equipment employed. Generally, pellets of a spherical configuration, such as derived from a disc-type pelletizing apparatus, having diameters ranging from about 1/8 inch up to about 1/2 inch, are satisfactory.
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