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Paper Information

Journal:   JOURNAL OF ADVANCES IN ENVIRONMENTAL HEALTH RESEARCH   2017 , Volume 5 , Number 3; Page(s) 154 To 162.
 
Paper: 

THE OPTIMIZATION OF CU AND FE BIOLEACHING FROM CONVERTER SLAG USING ACIDITHIOBACILUS FERROOXIDANS

 
 
Author(s):  AHMADI SAEB, VAFAIE SEFTI MOHSEN*, SHADMAN MOHAMMAD MAHDI, AZIMI DIJVEJIN ZAHRA, HOSSINI HOSHYAR
 
* CHEMICAL ENGINEERING DEPARTMENT, TARBIAT MODARES UNIVERSITY, TEHRAN, IRAN
 
Abstract: 

The main objective of this work was to assess the optimization of Fe and Cu bioleaching from converter slag using Acidithiobacillus ferrooxidans. Important parameters that contribute to the bioleaching process include initial pH, initial Fe2+ concentration and pulp density. In order to optimize these parameters, the response surface methodology (RSM) was applied. The maximum simultaneous Fe and Cu recovery yields were 95% and 100%, respectively. The optimum conditions were initial pH 1.8, initial density 1.4 g/100 mL and initial Fe2+7.3 g/L. The comparison between chemical leaching and bioleaching results showed that bioleaching improved the recovery yields of Fe and Cu by 26% and 33%, respectively. The modified shrinking core model was used to determine the ratelimiting step of the process. It was found that diffusion through the product layer and chemical reaction are the rate controlling steps.

 
Keyword(s): BIOLEACHING, CONVERTER SLAG, ACIDITHIOBACILLUS FERROOXIDANS, OPTIMIZATION, KINETIC
 
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