Zinc Extraction from Industrial Waste by Acid Leaching Process
Jitti Kamsawat ¹ Sathian Nilthawach ² and Aphichart Rodchanarowan ^1*
1 Department of Materials Engineering, Faculty of Engineering, Kasetsart University, 50 Ngamwongwan Rd., Lat Yao, Chatuchak, Bangkok, 10900, Thailand.
² The Sirindhorn International Thai-German Graduate School of Engineering, King Mongkut University of Technology North Bangkok, 1518 Pracharat 1 Rd., Wongsawang, Bangsue, Bangkok 10800.

Abstract

In this study, the leaching of zinc metal from industrial waste was investigated using acid leaching process. According to the XRD results, the chemical composition of industrial waste consisted of gypsum, silver sulfite and Ajento-jarosite (AgFe2(SO4)2(OH)6). Moreover the results from SEM/EDS and LEP also showed that there were many kinds of value metals in the Jarosite such as Indium, Copper, Silver and Zinc. Based upon the study, the leaching of Jarosite by sulfuric acid as leaching solution, Zinc from the Jarosite was able to be leached out more than 80% of overall Zinc metal in Jarosite.