Chromium slag detoxification by carbon monoxide off-gases and optimization of detoxification parameters by Box–Behnken design

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This study explores the feasibility and advantages of chromium slag (CS) detoxification by carbon monoxide (CO) off-gases. A chromate plant in an industrial park was surveyed to determine the pollution distribution and pathways. Based on the plant’s layout, the technology of CS dry-detoxification by CO off-gases was proposed. The response surface methodology and Box–Behnken design were adopted in bench-scale experiments to analyze and optimize the factors that influence the reaction. The effect of H2, which is the major impurity in CO off-gases, was studied using simulated off-gases. The results indicated that CO could effectively reduce Cr(VI) below 400 °C, and a small amount of H2 in the off-gases significantly promoted the detoxification effect. The Box–Behnken design experiment showed that temperature was the key factor in the reduction process. Simulated polynomial functions were proved to be effective in optimizing the technological parameters and predicting the detoxification effects.

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This study was supported by the National Key Technology R&D Program of China (no. 2017YFC0210504), and the Major Projects of Technical Innovation in Hubei Province of China (no. 2017ACA092). We gratefully acknowledge the editor and anonymous reviewers for their valuable help in the review and revision process.

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Correspondence to Ping Ning.

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He, L., Li, B., Ning, P. et al. Chromium slag detoxification by carbon monoxide off-gases and optimization of detoxification parameters by Box–Behnken design. J Mater Cycles Waste Manag 22, 111–122 (2020) doi:10.1007/s10163-019-00918-1

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  • Chromium slag
  • Carbon monoxide off-gases
  • Dry-detoxification
  • Response surface methodology
  • Box–Behnken design