Method of reducing deterioration of electric furnace...

Details Method of reducing deterioration of electric furnace... Method of reducing deterioration of electric furnace...

C - Chemistry, Metallurgy

03

B

49/77, 49/9

C03B 37/02 (2006.01)

Patent

CA 1091022

Abstract A process is described for the reduction or prevention of deterioration of refractory metal components of an electric furnace by chromia-containing oxide melts. The process is based on the discovery of an unexpected series of oxidation/reduction reactions leading to formation of chromium trioxide and subsequent oxidation of the refrac- tory metal (e.g., molybdenum or tungsten) by the chromium trioxide. The process comprises adding to the mixture of oxides in the furnace a component which is oxidized to an oxide with a lower free energy of formation per mole of oxygen than the refractory metal oxides (such as Mo02, Mo03, W02 or W03) and chromia, and which thus reduces Cr03 to a compound which is inert to the refractory metal. In a preferred embodiment the additive is a carbonaceous material and may be in the form of powdered coal.

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