Method of reducing deterioration of electric furnace refractory

Details Method of reducing deterioration of electric furnace refractory Method of reducing deterioration of electric furnace refractory

1977-08-26

1978-07-11

Kellogg, Arthur D.

Glass manufacturing

Processes

With shaping of particulate material and subsequent fusing...

65 32, 65DIG2, 106 50, 106 52, C03B 502

Patent

active

040999491

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 refractory 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 MoO.sub.2, MoO.sub.3, WO.sub.2 or WO.sub.3) and chromia, and which thus reduces CrO.sub.3 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. The stoichiometric amount of additive will be about 20 to 50 percent by weight of the percent by weight of chromia present.

REFERENCES:
patent: 2581440 (1952-01-01), Pincus
patent: 3066504 (1962-12-01), Hartwig et al.
patent: 4057408 (1977-11-01), Pierson et al.

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