The Separation Pilot Study of Cadmium from Zinc SulfateSolution by Cementation
|Location||21th symposium on geosciences|
|Holding Date||24 May 2008|
The aim of this research was to study the effective factors in cementation of cadmium from zinc sulfate by zinc powder and to determine the amount of zinc powder consumption in different concentrations of cadmium in pilot scale.
In general, research was carried out in two stages. In the first stage, it was observed that the increase of temperature, concentration of sulfuric acid and concentration of cadmium in leach solution have a positive effect and the presence of nickel and cobalt ions have a negative effect on the process of cementation of cadmium. The increase of zinc concentration in leach solution decreases the cementation of cadmium. Presence of copper ion in leach solution also strengthens the cementation operation. Considering of test results, optimal conditions for these operations were determined as this: operation temperature 50? C, concentration of zinc in leach solution 135 gr/l. , concentration of copper ion about 15 mg/ l, cementation time 25 minutes and pH = 3.5 ? 4
In the second stage of the study, the amount of consumed zinc powder for the cementation process of different concentrations of cadmium content of zinc sulfate solution was determined. The results were confirmed by working in the industrial scale.
Keywords: Cementation, Cadmium, Zinc Powder, Zinc Sulfate