A common problem in zinc solvent extraction system is precipitation of zinc sulfate, specially in scrubbing segment. Can I dissolve it by changing the level of some factors as temperature, chemical potential or ...?
I am not sure whether your question concerns the solubility of zinc sulfate in water, but ZnSO4.7H2O is very soluble in water under neutral or acidic conditions (> 50 g/100 mL at room temperature). Solubility does increase with temperatures, e.g. > 100 g/100 mL at 70°C. Can you describe your problem in more detail?