Vacuum Smelting Process for Producing Ferrotungsten-Description VI

It is also important that the briquettes or pellets formed are of sufficient green strength so that they will not crush or deform when loaded as a static three-dimensional bed in a vacuum furnace, thereby assuring the retention of the porosity of the bed through which the volatile constituents and gaseous reaction products can escape during the vacuum smelting reaction. Adequate green strength to enable a preliminary handling of the pellets, as well as providing the requisite final strength necessary during the initial stage of the vacuum smelting operation, can be imparted to the agglomerates by incorporating any one of a variety of inexpensive binder materials which volatilize without leaving any substantial residue under the temperature and vacuum conditions present in the reactor. For this purpose, binder materials including starches, gelatins, sugars, molasses, sodium silicate, etc., can be employed, of which a dilute molasses solution has been found as being particularly satisfactory. Such binder materials are generally incorporated in amounts ranging from about 2% up to about 10%, with the specific amount used in any particular situation varying in consideration of such factors as the particular size of the tungsten mineral concentrate particles, the manner of agglomerating the particulated mixture and the size of the resultant pellets desired.

 

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