To recycle vanadium and chromium from the V?Cr-bearing reducing slag,the thermodynamics of separating V(IV)and Cr(III)at 298 K was summarized in the form of potential-pH diagram and activity-pH diagram.The potential-p...To recycle vanadium and chromium from the V?Cr-bearing reducing slag,the thermodynamics of separating V(IV)and Cr(III)at 298 K was summarized in the form of potential-pH diagram and activity-pH diagram.The potential-pH diagrams of V-Mn-H2O and Cr-Mn-H2O systems show that the electrode potential of MnO2/Mn2+is higher than that of VO2+/VO2+but lower than that of Cr2O7 2-/Cr3+,which proves that it is feasible to selectively oxidize low valent vanadium using MnO2.The activity-pH diagrams of V(V)-H2O and Cr(III)-H2O systems show that the precipitation pH of V(V)is far lower than that of Cr(III),and therefore V(V)and Cr(III)can be separated through precipitation method.Based on the thermodynamic analysis,the flowsheet of recovery of vanadium and chromium from the V-Cr-bearing reducing slag is designed.展开更多
某炭质钒矿石的V_(2)O_(5)品位为1.40%,研究了采用矿石预处理-硫酸浸出-P204+TBP+煤油萃取-氨水沉钒工艺从中提取五氧化二钒。实验结果表明:在矿石粒度-0.074 mm 12.79%,硫酸用量35%,浸出温度90℃条件下,钒浸出率达76%;对于含钒浸出液,...某炭质钒矿石的V_(2)O_(5)品位为1.40%,研究了采用矿石预处理-硫酸浸出-P204+TBP+煤油萃取-氨水沉钒工艺从中提取五氧化二钒。实验结果表明:在矿石粒度-0.074 mm 12.79%,硫酸用量35%,浸出温度90℃条件下,钒浸出率达76%;对于含钒浸出液,用P204+TBP+煤油溶剂萃取和稀硫酸反萃取,氯酸钠氧化-氨水沉钒,沉淀物经烘干煅烧,最终得到纯度为97.14%的V_(2)O_(5)产品。展开更多
基金Project(51104186)supported by the National Natural Science Foundation of ChinaProject(2016JJ2142)supported by the Natural Science Foundation of Hunan Province,ChinaProject supported by the Open-End Fund for the Valuable and Precision Instruments of Central South University,China
文摘To recycle vanadium and chromium from the V?Cr-bearing reducing slag,the thermodynamics of separating V(IV)and Cr(III)at 298 K was summarized in the form of potential-pH diagram and activity-pH diagram.The potential-pH diagrams of V-Mn-H2O and Cr-Mn-H2O systems show that the electrode potential of MnO2/Mn2+is higher than that of VO2+/VO2+but lower than that of Cr2O7 2-/Cr3+,which proves that it is feasible to selectively oxidize low valent vanadium using MnO2.The activity-pH diagrams of V(V)-H2O and Cr(III)-H2O systems show that the precipitation pH of V(V)is far lower than that of Cr(III),and therefore V(V)and Cr(III)can be separated through precipitation method.Based on the thermodynamic analysis,the flowsheet of recovery of vanadium and chromium from the V-Cr-bearing reducing slag is designed.
文摘某炭质钒矿石的V_(2)O_(5)品位为1.40%,研究了采用矿石预处理-硫酸浸出-P204+TBP+煤油萃取-氨水沉钒工艺从中提取五氧化二钒。实验结果表明:在矿石粒度-0.074 mm 12.79%,硫酸用量35%,浸出温度90℃条件下,钒浸出率达76%;对于含钒浸出液,用P204+TBP+煤油溶剂萃取和稀硫酸反萃取,氯酸钠氧化-氨水沉钒,沉淀物经烘干煅烧,最终得到纯度为97.14%的V_(2)O_(5)产品。
