銅転炉カラミ中の銅, 亜鉛の塩化に関する基礎研究
1978 年 94 巻 1090 号 p. 865-870
詳細
1978 年 94 巻 1090 号 p. 865-870
When copper converter slag is used as a raw material for iron smelting, copper and zinc in the slag must be removed as much as possible.
In this experiment, the differences of chloridizing process of Cu2S, Cu2O, ZnS and ZnO have been investigated for the weight change by chloridizing roasting and X ray diffraction of roasted samples. Chlorine was obtained by decomposition of CaCl2·2H20 or NaC1 mixed in the samples.
The obtained results are summarized as follows.
(1) When Cu2S samples are roasted in the air, CaCl2 is converted to CaSO4 and Cu2S is converted to CuCl by following equation.
Cu2S+ CaCl2+2O2= 2CuCl+ CaSO4 The volatilization temperature of CuCI formed by roasting is about 600°C.
(2) When the similar samples are roasted in the pure oxygen, Cu2S is coilverted to CuO at 400-500°C by following reaction. Cu2S+ CaCl2+ 302= 2CuO+CaSO4+Cl2 CuO is converted to CuCl at 500°C.
(3) The formation rate and volatilization rate of CuCl will be balanced at about 600°C.
(4) ZnCl2 is volatilized as soon as it is formed from ZnS or ZnO.
(5) Chloridization temperature of oxides is about 100-150°C higher than that of sulphides.
