钒渣焙烧过程钒元素价态变化特征探讨

Discussion on Variation Characteristics of Vanadium Element Valence State During Roasting Process of Vanadium Slag

综合利用光电子能谱及矿物分析仪,研究了钒渣及无盐焙烧阶段不同温度节点下的钒渣熟料的矿物组成及钒元素价态组成。结果表明:钒尖晶石、铁橄榄石和钙铁辉石含量随焙烧温度升高而下降,氧化铁、铁板钛矿、钒酸锰等矿物含量随焙烧温度升高而增加;随焙烧温度升高,钒渣逐步由以V^(3+)氧化为V^(4+)为主的边缘氧化向V^(3+)氧化为V^(4+)与V^(4+)氧化为V 5+共存的内部氧化过渡;钒尖晶石中钒的价态为V^(3+),氧化态钒尖晶石中钒的价态为V^(4+);钒渣及熟料矿物分析结果与钒元素价态分析结果之间一致性较好。

The mineral composition and valence state composition of vanadium clinker in vanadium slag and salt-free roasting stage at different temperature nodes were studied by photoelectron spectroscopy and mineral analyzer.The results show that the contents of vanadium spinel,ferroolivine and calciferite decrease with the increase of roasting temperature,while the contents of iron oxide,ferrotitanite and manganese vanadate increase with the increase of roasting temperature.With the increase of roasting temperature,the oxidation of vanadium slag from V^(3+)to V^(4+)is gradually transformed into the internal oxidation of V^(3+)to V^(4+)and V^(4+)to V 5+.The valence state of vanadium in vanadium spinel is V^(3+)and the valence state of vanadium in oxidation state is V^(4+).The mineral analysis results of vanadium slag and clinker are in good agreement with the valence analysis results of vanadium element.