Leaching of vanadium and chromium from converter vanadium slag intensified with surface wettability

• Published in: Journal of Central South University Vol. 25; no. 6; pp. 1317 - 1325
• Main Authors: Yang, Qi-wen, Xie, Zhao-ming, Peng, Hao, Liu, Zuo-hua, Tao, Chang-yuan
• Format: Journal Article
• Language: English
• Published: Changsha Central South University 01.06.2018; Springer Nature B.V
• Subjects: Chromium; Engineering; Leaching; Manganese dioxide; Metallic Materials; Organic chemistry; Reaction mechanisms; Sodium dodecyl sulfate; Steel converters; Sulfuric acid; Surface tension; Vanadium; Wettability; 二氧化锰; chromium; 钒; 十二烷基硫酸钠; vanadium; leaching; 铬; surfactant; MnO; 浸出
• ISSN: 2095-2899; 2227-5223
• DOI: 10.1007/s11771-018-3828-2

Technology intensified with surface wettability was introduced to leach vanadium and chromium from converter vanadium slag without roasting. Parameters affecting the leaching efficiency of vanadium and chromium were investigated: sulfuric acid concentration, MnO 2 -to-slag mass ratio, liquid-to-solid ratio, leaching time, leaching temperature, and sodium dodecyl sulfate (SDS)-to-slag mass ratio. The leaching efficiencies of vanadium and chromium were 33.46 % and 20.02 % higher in the presence of MnO 2 and SDS, respectively, compared to the control. The leaching efficiencies of vanadium and chromium were 68.93 % and 30.74 %, respectively, under the optimum conditions: sulfuric acid concentration 40 wt%, MnO 2 -to-slag mass ratio 10.0 wt%, liquid-to-solid ratio 5:1 mL/g; 12 h; 90 °C; and SDS-to-slag mass ratio 0.25 wt%. The analysis of the reaction mechanism in the leaching process indicates that MnO 2 combined with protons (H + ) could oxidize low-valent vanadium and chromium; SDS could change the chemical behavior and decrease the surface tension of the aqueous solution to favor MnO 2 oxidization.