Reduction roasting–magnetic separation of vanadium tailings in presence of sodium sulfate and its mechanisms
| Autor: | Guanzhou Qiu, Yu-lei Sui, Andrew Yakovlevich Travyanov, Tao Jiang, Feng Chen, Yufeng Guo |
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| Rok vydání: | 2015 |
| Předmět: |
Materials science
Metallurgy Metals and Alloys Vanadium chemistry.chemical_element Slag Sodium silicate 02 engineering and technology Condensed Matter Physics Chemical reaction Tailings 020501 mining & metallurgy chemistry.chemical_compound 0205 materials engineering chemistry visual_art Sodium sulfate Materials Chemistry visual_art.visual_art_medium Physical and Theoretical Chemistry Roasting Sodium aluminosilicate Nuclear chemistry |
| Zdroj: | Rare Metals. 35:954-960 |
| ISSN: | 1867-7185 1001-0521 |
| DOI: | 10.1007/s12598-015-0616-0 |
| Popis: | Reduction roasting with sodium sulfate followed by magnetic separation was investigated to utilize vanadium tailings with total iron grade of 54.90 wt% and TiO2 content of 17.40 wt%. The results show that after reduction roasting–magnetic separation with sodium sulfate dosage of 2 wt% at roasting temperature of 1150 °C for roasting time of 120 min, metallic iron concentrate with total iron grade of 90.20 wt%, iron recovery rate of 97.56 % and TiO2 content of 4.85 wt% is obtained and high-titanium slag with TiO2 content of 57.31 wt% and TiO2 recovery rate of 80.27 % is also obtained. The results show that sodium sulfate has a catalytic effect on the reduction of tailings in the novel process by thermodynamics, scanning electron microscopy (SEM) and X-ray diffraction (XRD) and reacts with silica and alumina in the tailings to form sodium silicate and sodium aluminosilicate. Migration of elements and chemical reactions destroy the crystal structures of minerals and promote the reduction of vanadium tailings, resulting in that iron grains grow to large size so that metallic iron concentrate with high total iron grade and low TiO2 content is obtained. |
| Databáze: | OpenAIRE |
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