Abstract
Studies were made on behaviors of cupric sulfate and zinc sulfate in roastings with weekly reducing atmospheres.Cupric sulfate was reduced to metallic copper with reducing gases containing CO only or CO and N2 in a temperature range 500°C-600°C.Rate of the reaction is nearly proportional to Pco3/4, and an apparent activation energy for the cupric sulfate reduction is 8.3 kcal/mol, therefore the reaction is considered as a diffusion-controlled reaction.The reaction product of zinc sulfate with reducing gases, containing CO, CO2 and N2 (pco/pco2=1/9) at 600°C and 650°C was basic zinc sulfate ZnO·2ZnSO4. At 700°C, zinc oxide and zinc sulfide (α-ZnS) were produced, which were formed stepwise by following reactions:3ZnSO4+CO3=ZnO·2ZnSO4+CO2+SO2…(1)ZnO·2ZnSO4+8CO=ZnO+2ZnS+8CO2…(2)Rate of the reaction (1) is nearly proportional to Pco1/3 within the limit of these experiment, and an apparent activation energy of the reaction (1) is 20.3 kcal/mol.Based on the above results j it may be considered that relective reduction of cupric sulfate with CO in the presence of zine sulfate is possible.
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