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Dissolution of Zinc-Cadmium Sulfide Solid Solutions in Aerated Aqueous Suspension

Dep. of Crop and Soil Sciences, Cornell Univ., Ithaca, NY 14853

View larger version (12K): [in this window] [in a new window]   Fig. 1. Dissolved concentrations of Zn2+ and SO42– measured simultaneously in several Zn–Cd sulfide suspensions undergoing oxidative dissolution.

View larger version (18K): [in this window] [in a new window]   Fig. 2. Concentration of dissolved S in aerated Zn–Cd sulfide suspensions as a function of time. The figure legend notes the Zn/Cd mole ratio of each of the metal sulfides.

View larger version (14K): [in this window] [in a new window]   Fig. 3. Zero-order rate constants for oxidative dissolution of metal sulfides as a function of initial metal sulfide Zn/Cd molar ratio, measured under conditions of constant pH (4.0) and variable (unadjusted) pH.

View larger version (19K): [in this window] [in a new window]   Fig. 4. Concentration of dissolved Zn in aerated Zn–Cd sulfide suspensions as a function of time. The figure legend notes the Zn/Cd mole ratio of each of the metal sulfides.

View larger version (18K): [in this window] [in a new window]   Fig. 5. Measured pH of aerated Zn–Cd sulfide suspensions as a function of time. The figure legend notes the Zn/Cd mole ratio of each of the metal sulfides.

View larger version (19K): [in this window] [in a new window]   Fig. 6. Depletion rates of molecular O2 from metal sulfide suspensions with different Zn/Cd mole ratios ranging from pure ZnS to pure CdS.

View larger version (21K): [in this window] [in a new window]   Fig. 7. Concentration of dissolved Cd in aerated Zn–Cd sulfide suspensions as a function of time. The figure legend notes the Zn/Cd mole ratio of each of the metal sulfides.