Leaching kinetics of acid-solube Cr(Ⅵ) from chromite ore processing residue in sulfuric acid
- Received Date: 20/08/2007
- Accepted Date: 09/12/2006
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Key words:
- chromite ore processing residue /
- acid leaching /
- acid-soluble Cr(Ⅵ) /
- kinetics
Abstract: In this paper, leaching activities of Cr(Ⅵ) from chromite ore processing residue(COPR) in sulfuric acid solution were investigated, the effects of temperature(T), concentration of sulfuric(c0) acid and particle size(r0) of COPR on leaching kinetics were studied. The results showed that the dissolution of acid-soluble Cr (Ⅵ) is caused by the reaction between COPR and sulfuric acid, and the leaching process can be described by shrinkage core model by data fitting, it is confirmed that leaching kinetics is controlled by intra-particle diffusion, the apparent activation energy is 9.32 kJ/mol. Based on theory model, an experiential formula including three parameters (T,c0 and r0) is proposed through multiple regression analysis.
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