Abstract
Currently, calcium-free roasted chromite ore processing residue (COPR) is the primary. Cr (VI)-containing by-product in chromate production industry. Given its significant. content of metal resources, appropriate measures should be implemented to effectively. harness its potential while mitigating environmental contamination risks. Herein, the. reductive alkali roasting process, in conjunction with physical separation techniques,. was proposed for the transformation of spinel in COPR into readily separable forms for. extraction. It was demonstrated that under the optimal roasting conditions. (COPR∶Na2CO3∶coke=20∶6.9∶2.96, 1100 ℃, 1hour), an extraction rate of Al. components at 72.14% and a Fe oxides metallization rate at 89.06% in COPR were. achieved. With CO2 bubbling, the extracted Al was finally recovered as Al2O3 product. of high purity. Due to the viscosity decreased by Al extracting, the melting separation. was more effective than magnetic separation in extracting metal iron from the Alextracted. residue. Finally, the Cr enriched slag was utilized to re-produce chromate as. an extraction rate of 95.23%. This study is based on a significant phase transformation. of spinel in COPR into NaAlO2, Fe, and NaCrO2, which was demonstrated to be. induced by the synergistic effect of Na2CO3 and coke. Moreover, the findings in this. study provides novel insights for the utilization of COPR or similar industrial waste, and. also can be extended to the extraction of Al, Fe and Cr from minerals. Response to Reviewers
Published Version
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