Abstract
The oxidation of spectroscopic grade graphite in sodium carbonate/sodium sulfate melts using oxidizing (air and oxygen) or inert (argon and nitrogen) sparge was investigated between 900 and 1000/sup 0/C. The oxidation rate increased with increasing graphite surface area, increasing melt temperature, and increasing oxygen concentration. The rate, in oxidizing atmospheres, at 900/sup 0/C was faster in pure sodium carbonate than in pure sodium sulfate with the maximum rate observed in mixed melts. At 950/sup 0/C the oxidation rate was virtually equal in the two pure melts, and at 982/sup 0/C the rate was faster in pure sodium sulfate. In melts containing sodium sulfate, the rate-determining step was apparently the same for reactions conducted in oxidizing and inert atmospheres, with sodium sulfate acting as a catalyst in the former and a reagent in the latter. Sequences of reactions are proposed for the oxidation of graphite in pure sodium carbonate, pure sodium sulfate, and mixed melts.
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