强化氧化对石煤钙化焙烧提钒的影响  

Effect of oxidation on vanadium extraction from stone coal with calcified roasting

作　　者：李昌林[1] 周向阳[1] 王辉[1] 张太康[1] 李劼[1] 欧星[1] 江小舵 

机构地区：[1]中南大学冶金科学与工程学院,湖南长沙410083

出　　处：《中南大学学报（自然科学版）》2011年第1期7-10,共4页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(50974136);中南大学大学生创新性实验项目(LD09155);湖南省研究生科研创新项目(CX2009B037)

摘　　要：研究石煤钙化焙烧参数对提钒效果的影响,确定合理的焙烧参数:当焙烧温度为950℃,焙烧时间3 h,碳酸钙添加量为质量分数6%时,石煤焙烧料中钒的浸出率为63%。在此基础上研究增强氧化对提钒效果的影响,比较通空气和添加MnO2这2种情况下提钒的效果。用化学物相分析和钒价态分析等技术探讨加强氧化提高钒浸出率的原因。空气通入速度为0.48 L/h时,钒的浸出率为69%;MnO2添加量(质量分数)为3%时,钒浸出率为68%。研究结果表明,加强氧化后矿石的结构被破坏,V5+含量提高,生成更多易溶于酸的钒酸钙类物质。The calcified roasting condition for vanadium extraction from stone coal was studied. Under the condition of 950 ℃, roasting 3 h, CaCO3 addition 6% （mass fraction）, the subsequent vanadium leaching efficiency of about 63% can be obtained. On the base of the same condition, effect of air sparging and MnO2 addition on vanadium extraction was investigated. The reason why oxidation can improve vanadium leaching was investigated through phase and valence state of vanadium analysis. Results show that vanadium leaching efficiency of 69% can be obtained with air sparging speed of 0.48 L/h and 68% with MnO2 addition of 3%. It is found that oxidation is effective to destroy the ore structure and increase the percentage of V5＋ in calcine, and more calcium vanadate compounds is generated, which easily responds to acid leaching.

关 键 词：钙化焙烧 钒 石煤 氧化 

分 类 号：TF841.3[冶金工程—有色金属冶金]