A highly synergetic method for clean utilization of high-carbon vanadium-bearing stone coal

• Published in: Journal of cleaner production Vol. 349; p. 131485
• Main Authors: Zhang, Jie, Liu, Kunpeng, Yan, Baijun
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 15.05.2022
• Subjects: Carbon gasification; High-carbon vanadium-bearing stone coal; Synergetic and cleaner method; Vanadium pre-concentration; Synergetic and cleaner method; High-carbon vanadium-bearing stone coal; Vanadium pre-concentration; Carbon gasification
• ISSN: 0959-6526; 1879-1786
• DOI: 10.1016/j.jclepro.2022.131485

Aiming at alleviating the difficulties of extracting vanadium from high-carbon stone coal and solving the relevant pollution problem, a new synergetic and cleaner method combining concentration of vanadium with clean utilization of carbon was proposed and corroborated. Firstly, Fe2O3, acting as the source for the catalytic of carbon gasification and the capturer of vanadium, was added to the raw ore. Then, the carbon within the raw ore was gasified by water vapor at 800–900 °C under the catalysis of reducing product of Fe2O3 (Fe3O4) to generate synthesis gas (CO + H2), and subsequently the vanadium dispersive occurred in the ore was captured by Fe3O4 at 1100–1200 °C under Ar atmosphere to form FexV3-xO4. Finally, the FexV3-xO4 phase was separated magnetically, and a high-grade vanadium concentrate was obtained. The experimental results show that the Fe3O4 effectively promoted the gasification rate and ratio of carbon. When 10 mass% Fe2O3 relative to raw ore was added and roasted at 850 °C for 2 h, the gasification ratio of carbon increased by 26%. The gasification ratio of carbon could reach up to 90.2%. Besides, the Fe3O4 could react with the V3+ components to form magnetic V-rich phase, FexV3-xO4, and the vanadium concentrate was obtained by magnetic separation. Under the optimal conditions, the vanadium concentrate with a metallic vanadium content of 6.35 mass% was obtained by magnetic separation, which was 23.5 times higher than the raw ore. The recovery ratio of vanadium reached 85.6%. •A synergetic method for cleaner utilization of high-carbon stone coal is proposed.•Fe2O3 acts as the source for the catalytic of C gasification and the capturer of V.•Water vapor is used to gasify carbon, and CO and H2 can be formed at 800–900 °C.•Magnetic V-rich phase can be formed at 1200 °C and extracted by magnetic separation.•C/V in the raw ore can be cleanly and synergistically utilized by one-step roasting.