Meguru Nagamori

Distribution of gold and silver between copper and matte

The distribution coefficients of silver and gold between copper and matte phases have been measured at 1400 and 1500 K. For 0.07 to 0.13 wt pct silver and 0.0022 to 0.0042 wt pct gold in ironfree matte, the distribution coefficients of silver and gold are independent of concentration. For iron-bearing matte, the distribution coefficients of silver and gold are correlated with iron content of the matte. From the measured values of the distribution coefficients of silver and gold, the activity coefficients of AgS0.5 and Au in copper-saturated matte have been calculated. The following correlations express these results: log γ°AgS0.5(1) = -425/T - 0.074 + 0.09NFeS, log γ°Au(1) =-7620/T + 7.25 forT = 1400 to 1500 K and NFeS, mole fraction of FeS = 0 to 0.28. The present values of the activity coefficients of AgS0.5 must be used exclusively in conjunction with the following Gibbs free energy of formation: 2Ag(l) + 1/2S2(g) = Ag2S(l), ΔG° = -23960 + 10.295T (cal/mol).

Distribution of lead between copper and matte and the activity of PbS in copper-saturated mattes

AbstractThe distribution coefficients of lead between copper and matte phases have been measured at 1405 and 1505 K and correlated with lead and iron concentrations in metallic copper and matte. Experiments covered the ranges of 0.009 to 1.8 and 0 to 11 wt pct lead and iron in matte, respectively. Distribution coefficients of lead between copper and iron-free matte, at infinite dilution of lead, have been determined to be 3.60 and 4.06 at 1505 and 1405 K, respectively. From the measured values of distribution coefficients, the Raoultian activity coefficients of PbS in copper-saturated matte have been calculated. At the temperatures and matte compositions investigated, activities of PbS deviate negatively from Temkins ideality. At infinite dilution, the following equation correlating the Raoultian activity coefficients of PbS, % MathType!MTEF!2!1!+-% feaafiart1ev1aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn% hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr% 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9% vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x% fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaqefavySfgDP5% 2BGWuAU9gD5bxzaGqbaiaa-n7adaqhaaWcbaacbaGaa4huaiaa+jga% caGFtbGaaiikaGqaciaa9XgacaGGPaaabaGaa43Baaaaaaa!43EC!

The grand partition function of dilute biregular solutions

\gamma _{PbS(l)}^o

An equilibrium study of the hydrogen reduction of copper sulfates

, with matte composition and temperature has been obtained: In % MathType!MTEF!2!1!+-% feaafiart1ev1aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn% hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr% 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9% vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x% fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaqefavySfgDP5% 2BGWuAU9gD5bxzaGqbaiaa-n7adaqhaaWcbaacbaGaa4huaiaa+jga% caGFtbaabaGaa43Baaaakiabg2da9iaaikdacaaI0aGaaGioaiaaiw% daruWrL9MCNLwyaGGbaiaa99cacaWGubGaeyOeI0IaaG4maiaac6ca% caaI0aGaaGioaiaaiIdacqGHsislcaaIWaGaaiOlaiaaiodacaaIYa% Gaa4NtamaaBaaaleaacaGFgbGaa4xzaiaa+nfaaeqaaaaa!55F9!

Activity of SnS in copper-saturated matte

\gamma _{PbS}^o = 2485/T - 3.488 - 0.32N_{FeS}

Thermodynamic stability of Cu 2 SO 4

, whereNFeS, is the mole fraction of FeS in the Cu2S-FeS-PbS matte. The present values of γPbSo must be used exclusively in conjunction with the following Gibbs free energy of formation: Pb(l) + 1/2S2(g) = PbS(l); ΔGℴ = −26730 + 12.20T (cal/mol).