銅電解アノード・スライム中の銀セレナイドおよび銅銀セレナイドの生成について

抄録

Selenium in copper anode containing silver is associated with copper as cupric selenide, but during the electrolytic refining, silver is dissolved into electrolyte and then reacts with cupric selenide to form anode slime as silver selenide or copper-silver selenide by the following reactions;
When the mole ratio of silver to selenium is two to one, the primary reaction is
Cu₂Se+Ag₂SO₄=CuAgSe+Ag+CuSO₄
Silver produced in thisreaction is further dissolved by oxygen in the solution and consequently silver selenide is formed by
CuAgSe+Ag+H₂SO₄+1/2O₂=Ag₂Se+CuSO₄+H₂O
The overall reaction, therefore, is
Cu₂Se+Ag₂SO₄+H₂SO₄+1/2O₂=Ag₂Se+2CuSO₄+H₂O
In the case of more or less silver content than above ratio, slime contains silver selenide and silver or copper-silver selenide, respectively, by
Cu₂Se+2Ag₂SO₄=Ag₂Se+2Ag+2CuSO₄
Cu₂Se+1/2Ag₂SO₄+1/2H₂SO₄+1/40₂=CuAgSe+CuSO₄+1/2H₂O