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Influence of CaO on Existence form of Vanadium-containing Phase in Vanadium Slag

机译：CaO对钒渣中含钒相存在形式的影响

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A novel de-Phosphorisation & V-extraction process (de-P & V-extraction) is proposed in which lime is added during the production of vanadium slag. This is expected to promote both phosphorus removal and environment-friendly vanadium extraction from the vanadium-containing hot metal simultaneously. The influence of CaO addition on the chemical components and mineralogical morphology of vanadium-containing phase in vanadium slags has been investigated by XRD and SEM/EDS. Results show that the increase in CaO contents changes both species of vanadium-containing phase and the morphologies of vanadium-containing spinels in vanadium slags. Vanadium concentrates as (Mn,Fe,Mg)V_(2)O_(4) in the spinel phase in vanadium slag with CaO content less than 10 mass%. When CaO content is higher than 12.89 mass%, vanadium exists both as (Mn,Fe,Mg)V_(2)O_(4) in dendritic-like spinel and as Ca_(3)V_(2)(SiO_(4))_(3) in goldmanite in the matrix. Precipitation of perovskite results in the dendritic-like shape of spinels while V~(3+) diffusing away from spinel lattice leads to the formation of goldmanite Ca_(3)V_(2)(SiO_(4))_(3). Thermodynamic calculation of phase equilibrium has been conducted to understand the phase evolution. This work demonstrates the influence of CaO addition on the existence form of vanadium-containing phase in vanadium slag and thus provides the theoretical foundation for the proposed novel de-P & V-extraction process.
机译：提出了一种新颖的脱磷和钒萃取工艺（de-P＆V-extraction），其中在钒渣生产过程中添加了石灰。预计这将同时促进除磷和从含钒铁水中提取环境友好的钒。通过XRD和SEM / EDS研究了CaO的添加对钒渣中含钒相化学成分和矿物形态的影响。结果表明，CaO含量的增加会改变钒渣中含钒相的种类和含钒尖晶石的形貌。钒在尖晶石相中以（Mn，Fe，Mg）V_（2）O_（4）的形式浓缩在钒渣中，CaO含量小于10质量％。当CaO含量高于12.89质量％时，钒以树状尖晶石中的（Mn，Fe，Mg）V_（2）O_（4）和Ca_（3）V_（2）（SiO_（4））的形式存在。 _（3）在基体中的金锰矿中。钙钛矿的沉淀导致尖晶石状的尖晶石形状，而V〜（3+）从尖晶石晶格中扩散出来会导致金刚石Ca_（3）V_（2）（SiO_（4））_（3）的形成。已经进行了相平衡的热力学计算以了解相演化。这项工作证明了CaO的添加对钒渣中含钒相的存在形式的影响，从而为提出的新型脱P＆V萃取工艺提供了理论基础。

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