Leaching behavior of valuable metals from by-product generated during purification of zinc electrolyte

다국어 초록 (Multilingual Abstract)

Purification cake generated during cementation process contains valuable and hazardous metals such as cadmium, copper, zinc, lead, cobalt, nickel, and antimony. The purification cake has been dumped in landfill sites, and this could cause the environmental problem such as leak of leachate and the loss of valuable metal. The present study is aimed at investigating the leaching behaviors of metals in sulfuric acid solution to recover the valuable metals. The effects of reaction time, temperature, sulfuric acid concentration, agitation speed, pulp density were investigated to establish the leaching conditions. More than 99.9% of cadmium and zinc were leached within 5 min and same ratio of cobalt was leached within 30 min. Copper, nickel, and antimony were leached 99, 97, 95%, respectively, after 60 min. Lead was detected about 2% in 60 min in 1.0 M sulfuric acid at 50 °C and 400 rpm with 10 g/L pulp density for 180 min. It is possible that lead remains as a precipitate and cadmium, zinc, copper, cobalt, nickel, antimony in leach solution are recovered.

참고문헌 (Reference)

1 Nelson, A., "The removal of cobalt from zinc electrolyte by cementation : A critical review" 20 : 325-356, 2000

2 Nelson, A., "The effect of solution constituents and novel activators on cobalt cementation" 39 : 175-186, 2000

3 Jha, M. K., "Review of hydrometallurgical recovery of zinc from industrial wastes" 33 : 1-22, 2001

4 Safarzadeh, M. S., "Recovery of zinc from Cd–Ni zinc plant residues" 97 : 67-72, 2009

5 Turan, M. D., "Recovery of zinc and lead from zinc plant residue" 75 : 169-176, 2004

6 Boyanov, B. S., "Purification of zinc sulfate solutions from cobalt and nickel through activated cementation" 73 : 163-168, 2004

7 Yang, D., "Mechanism of cobalt removal from zinc sulfate solutions in the presence of cadmium" 81 : 62-66, 2006

8 Safarzadeh, M. S., "Kinetics of sulfuric acid leaching of cadmium from Cd–Ni zinc plant residues" 163 : 880-890, 2009

9 Altundoğan, H. S., "Heavy metal pollution potential of zinc leach residues discarded in Çinkur plant" 22 : 167-177, 1998

10 Safarzadeh, M. S., "Determination of the optimum conditions for the leaching of Cd–Ni residues from electrolytic zinc plant using statistical design of experiments" 58 : 367-376, 2008

11 van der Pas, V., "A fundamental study of cobalt cementation with zinc dust in the presence of copper and antimony additives" Delft University of Technology 1995

12 van der Pas, V., "A fundamental study of cobalt cementation by zinc dust in the presence of copper and antimony additives" 43 : 187-205, 1996