A novel method for extracting vanadium by low temperature sodium roasting from converter vanadium slag

查看全文 作　　者：Rongrui [1,2]Deng;Hao [1,2]Xiao;Zhaoming [1,2]Xie;Zuohua [1,2]Liu;Qiang [1,2]Yu;Geng [1,2]Chen;Changyuan [1,2]Tao

机构地区：[1]College of Chemistry and Chemical Engineering,Chongqing University,Chongqing 400044,China;[2]Chongqing Key Laboratory of Chemical Process for Clean Energy and Resource Utilization,Chongqing 400044,China

出　　处：《Chinese Journal of Chemical Engineering》索引2020年第28卷第8期,共6页

基　　金：supported by the National Key Research and Development Program of China,China(2017YFB0603105);the Key Program of Key Program of National Natural Science Foundation of China,China(21636004)。 摘　　要：Long-term high temperature in conventional vanadium extraction process would cause particles to be sintered and wrapped, thus reducing extraction efficiency of vanadium. Based on the purpose of directional conversion and process intensification, this work proposed a combination of low temperature sodium roasting and high efficiency selective oxidation leaching in vanadium extraction. The investigation of the reaction mechanism suggested that the structure of vanadium slag was changed by roasting, which also caused the fracture of spinel.The addition of MnO2 promoted the directional oxidation of low-valent vanadium into high valence. It also found that Na2S2O8 could oxidize low-valent vanadium effectively in leaching. The leaching efficiency of vanadium reached 87.74% under the optimum conditions, including a roasting temperature of 650 ℃, a roasting time of 2.0 h, a molar ratio of sodium-to-vanadium of 0.6, a MnO2(roasting additive) dosage of 5 wt% and a Na2S2O8(leaching oxidant) dosage of 5 wt%. This percentage is 7.18% higher than that of direct roasting-andleaching under the same conditions. 关键词：Directional conversion Oxidation leaching Process intensification Vanadium slag

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A novel method for extracting vanadium by low temperature sodium roasting from converter vanadium slag

参考文献(32)

引证文献(13)

耦合文献(64)

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