Notice of RetractionPyrolysis Treatment of Chromite Ore Processing Residue with Waste Tyre

Notice of Retraction

After careful and considered review of the content of this paper by a duly constituted expert committee, this paper has been found to be in violation of IEEE´s Publication Principles.

We hereby retract the content of this paper. Reasonable effort should be made to remove all past references to this paper.

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Chromite Ore Processing Residue (COPR) is the byproduct of chromate production process, which contains a large amounts of Cr(VI). The present work developed a new technique to treat COPR, and the process involved mixing the COPR with waste tyre followed by pyrolysis. It was found that the reducing volatile fraction generated during pyrolysis of tyre was beneficial to Cr(VI) reduction. In the study, process variables, such as the amount of tyre added to COPR, heating temperature and particle size, were systematically varied, and their influences on the Cr(VI) reduction in COPR were all investigated. After pyrolysis, Cr(VI) decreased greatly, from 3400 for untreated COPR to less than 30 mg kg^-1 for treated COPR at 600°C.