REDUCTION CARBURIZATION OF WOLFRAMITE (FEWO4) .2. EFFECT OF SNO2, MNO AND NIO ON REDUCTION WITH CARBON

Synthetic FeWO4 and Fe2WO6 were prepared by precipitation from aqueous solutions. Their carbothermic reduction with graphite was then studied at 1200-degrees-C. The effects of additions of SnO2, MnO and NiO to synthetic FeWO4 on the rates of reaction and the products of reduction and carburization with graphite and coal were investigated. The presence of SnO2 and MnO is shown to reduce the rate of reduction and carburization of FeWO4 significantly. The addition of NiO to FeWO4 prior to reduction-carburization permits the production of a material that consists of WC embedded in an austenitic Fe-Ni matrix.