A novel roasting process to extract vanadium and chromium from high chromium vanadium slag using a NaOH-NaNO3 binary system
| Autor: | Xiangxin Xue, Aijun Teng |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
021110 strategic
defence & security studies Reaction mechanism Environmental Engineering Materials science Health Toxicology and Mutagenesis Metallurgy 0211 other engineering and technologies Vanadium chemistry.chemical_element 02 engineering and technology 010501 environmental sciences 01 natural sciences Pollution Sodium salt Chromium chemistry Microwave heating Environmental Chemistry Binary system Leaching (metallurgy) Waste Management and Disposal 0105 earth and related environmental sciences Roasting |
| Zdroj: | Journal of Hazardous Materials. 379:120805 |
| ISSN: | 0304-3894 |
| DOI: | 10.1016/j.jhazmat.2019.120805 |
| Popis: | This paper proposed a novel roasting process of extracting vanadium from high chromium vanadium slag. In this process, the high chromium vanadium slag was treated by NaOH-NaNO3 binary sodium salts, roasted in microwave heating furnace, and leached by water. During the roasting process, the temperature and time took a significant role in the conversion of vanadium and chromium. This novel microwave roasting was able to improve heating speed, accelerate the oxidization and decomposition of slag, and shorten the roasting time, compared with conventional muffle roasting. Under the optimum microwave roasting conditions (1 NaOH/NaNO3 mass ratio, 450 ℃ roasting temperature, and 10 min roasting time), the leaching rates of vanadium and chromium were 94.11% and 90.81%, respectively. In the leaching process, the reaction mechanism for the water leaching process was proposed. The process showed that leaching time and sample size played a significant role, while leaching temperature and liquid-to-solid ratio showed no obvious effect. The leaching residue analysis showed the major mineralogical phases were Fe2O3, Na2TiO3, NaFeSiO4, and a small amount of polymeric substance ((Mn,Ca)x(Fe0.6,Cr0.4)yOz·nSiO2). |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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