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In this study, the removal/precipitation of selenium with sodium sulfide from initially weakly acidic sulfate solutions containing 300mg/L of selenium(IV) at 23°C was studied. The results showed that, below a pH of approximately 7.0, the precipitation reaction was complete at a sulfide to selenium ratio above 1.8 and less than 11 with less than 0.005mg/L of soluble selenium remaining in solution....
It is the scope of this paper to review and apply the theory of crystallization kinetics to the analysis and design of aqueous inorganic hydrometallurgical precipitation systems. In particular the critical role of supersaturation in controlling the properties (crystallinity–stability, particle size and cleanliness) of the precipitated compounds is emphasized. The approach taken is of generic nature...
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