1The Faculty of Education, Kanazawa University,
In a previous report, the equilibrium diagram of Cu-S-O system at 760 mmHg has been determined by the author.
Using the Cu-S-O diagram, some considerations have been given to the fundamental reactions of copper smelting and the solidification of blister copper.
(1) The reactions of Cu2S with O2 at 760 mmHg are as follows.
[Cu2S] + O2 → [Cu2O] +SO2 at 650°C [Cu2S] + O2 → [Cu] +SO2 at 900°C (Cu2S soln) + O2 → (Cu soln) +SO2 } at 1150°C (Cu soln) + O2 → [Cu2O] +SO2
(2) The solidification process of blister copper may occur in the following order: (a), (b), (c) and (d).
(a) (Cu soln) → SO2
(b) (Cu soln) → [Cu] +SO2
(c) (Cu soln) → [Cu] + [Cu2S] +SO2 or (L) → [Cu] + [Cu2O] +SO2
(d) [Cu] +SO2 → [Cu2S] + [Cu2O]
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