Physico-chemical Researches of some Fundamental Reactions of Copper Metallurgy (4th Report)

Effect of nickel, silver or tin on the equilibrium of molten copper, sulphur and hydrogen

Abstract

An equilibrium study was made of the following reaction at temperatures 1, 200° and 1, 250°C:
Cu₂S (in liq. Cu-M alloy) +H₂↔2Cu (l)+H²S
or
S (in liq. Cu-M alloy) +H₂↔H₂S
where M=Ni, Ag or Sn. From the known equilibrium constant of the reaction and the experimentaldata, the activities of sulphur in the melt were detemined.
The activity coefficient of sulphur was increased by nickel, silver and tin. Namely, atconstant temperature and constant H2S concentration in the gas phase, the sulphur content ofthe melt at equilibrium decreased as the nickel, silver or tin content was increased.