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Journal of the Southern African Institute of Mining and Metallurgy

On-line version ISSN 2411-9717
Print version ISSN 2225-6253

Abstract

YU, Y. et al. Effect of cooling conditions on the leachability of chromium in Cr2O3-containing steelmaking slag. J. S. Afr. Inst. Min. Metall. [online]. 2018, vol.118, n.5, pp.539-543. ISSN 2411-9717.  http://dx.doi.org/10.17159/2411-9717/2018/v118n5a10.

The effects of temperature and atmosphere during cooling on the leachability of chromium from stainless steel slag were investigated. Experiments were performed under an oxidizing atmosphere in a muffle furnace and in a reducing atmosphere in an induction furnace. The slags were subjected to leaching tests using the standard procedure prEN12457-2. Results indicated that an oxidizing atmosphere enhances the leachability of chromium and that the extent of leaching increases with temperature. A reducing atmosphere tends to suppress the leaching of chromium. Differences between the chromium leached from the samples cooled under different atmospheres revealed that it is difficult for CO to completely reduce chromium Cr6+ to Cr3+ once hexavalent chromium has been generated. Therefore, it is necessary to utilize a neutral or reducing atmosphere for cooling the slag so as to prevent the formation of hexavalent chromium.

Keywords : atmosphere; oxidation; hexavalent chromium; stainless steel slag; chromium leaching.

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