Abstract
The equilibrium relation among SO2 gas and oxygen and sulphur in molten copper, calculated from the theoretical equation obtained in the previous report, was numerically compared with the observed data in a reverberatory furnace and a copper alloying furnace. The results obtained may be summarized as follows: The effect of sulphur content in heavy oil is small in anode copper refining and on the other hand, is great in wire bar refining in a reverberatory furnace. If sulphur content in heavy oil is >0.3%, it is obtained numerically that the sulphur content of copper increases rapidly from 0.005% to 0.007% when the oxygen content is <0.045∼0.05%, and the partial pressure of SO2 is 1×10−3∼5×10−4 atmosphere at 1200°. In these cases, many large blowholes appear in the cast copper. This phenomenon is so called overpoling due to SO2 gas evolution. Next it is shown that in a copper alloying furnace, the observed data are approximately distributed on the equilibrium curves.
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