Investigation of Carbothermic Reduction of Ilmenite Concentrate with Calcium Carbonate Addition Using the Rietveld Method
The carbothermic reduction of ilmenite concentrate was performed with the addition of calcium carbonate (CaCO<sub>3</sub>) as an additive. The effects of roasting temperature and CaCO<sub>3</sub> content on calcium titanate (CaTiO<sub>3</sub>) formation and metall...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2024-11-01
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| Series: | Metals |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2075-4701/14/12/1321 |
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| Summary: | The carbothermic reduction of ilmenite concentrate was performed with the addition of calcium carbonate (CaCO<sub>3</sub>) as an additive. The effects of roasting temperature and CaCO<sub>3</sub> content on calcium titanate (CaTiO<sub>3</sub>) formation and metallic iron reduction were investigated. The Rietveld method was employed for qualitative and quantitative analysis of roasting products. It was found that as the temperature increased from 1000 °C to 1400 °C, the calcium titanate content increased from 21.95% to 83.02%. Similarly, as the CaCO<sub>3</sub> content increased, the calcium titanate content rose from 0% to 83.11%, while the metallic iron content increased from 4.52% to 10.37%. SEM-EDS analysis suggested that adding CaCO<sub>3</sub> during the carbothermic reduction of ilmenite promoted the aggregation and growth of metallic iron particles. The roasting products obtained under optimal conditions were subjected to three-stage grinding and three-stage magnetic separation. The final metallic iron product had a grade of 90.01% and a recovery rate of 91.32%. The calcium titanate product contained 55.43% TiO<sub>2</sub>, with a titanium recovery rate of 85.90%. Rietveld results indicated that the calcium titanate product had a high purity, with a content of 90.87%. This study effectively improved the comprehensive utilization of titanium and iron resources in ilmenite. |
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| ISSN: | 2075-4701 |