Remediation of chromite ore processing residue by pyrolysis process with sewage sludge
2009
Zhang, Dalei | Kong, Hainan | Wu, Deyi | He, Shengbing | Hu, Zhanbo | Hu, Xiaofang
The present work developed a novel technique to treat chromite ore processing residue (COPR). The process involved mixing the COPR with sewage sludge followed by pyrolysis. The gaseous organic fraction generated during pyrolysis of sludge was beneficial to Cr(VI) reduction. Process variables, such as the amount of sludge added to COPR (sludge-to-COPR (S/C) ratio), heating temperature, reaction time and particle size, were systematically varied, and their influences on the Cr(VI) reduction in COPR were investigated. Cr(VI) content had decreased greatly, from 3384mg kg⁻¹ for untreated COPR to less than 30mg kg⁻¹ for COPR treated at 600°C.
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