The vaporization of vanadium pentoxide from CaO-SiO₂-VO_x ternary slags using different gas treatment regimens and parallel vacuum gas extirpation to treat V-bearing slags at 1873 K has been developed in the present study. The novelty of the present study is to monitor the effect of parallel alumina dissolution on the vaporization phenomenon. Vanadium pentoxide has high vapor pressure at the temperatures over 1500 K. When CaO-SiO₂-VO_x ternary slags, kept in dense alumina crucibles, are injected with oxygen, V₂O₅ gas bubbles are formed which are forced out by using vacuum extirpation. The vanadium pentoxide could be then collected in the exhaust gases. The mechanism of the process phenomenon is described as the formation of V₂O₅ gas phase resulting from the oxidation of the lower-valent oxides present in the slag. This gas phase would form microbubbles in the molten slag bulk phase due to low surface tension between the gas phase and the slag, thereby increasing the contact surface. At the same time, the crucible material would dissolve in the slag causing an increase in the slag viscosity. Due to the high slag viscosity of the bulk slag, these microbubbles formed would have difficulty in coalescing and reaching the slag surface. The escaping of the bubbles into the gas phase is enabled by the vacuum extirpation.

本研究开发了使用不同的气体处理方案和平行真空抽气法处理1873 K下含V渣的CaO-SiO ₂ -VO _x三元渣中的五氧化二钒汽化的方法。本研究的新颖性是监测平行氧化铝溶解对汽化现象的影响。五氧化二钒在高于1500 K的温度下具有较高的蒸气压。当将CaO-SiO ₂ -VO _x三元炉渣保存在致密的氧化铝坩埚中时，会向其中注入氧气V ₂ O _5。形成了气泡，这些气泡通过使用真空除尘而被赶出。然后可以将五氧化二钒收集在废气中。该过程现象的机理被描述为V ₂ O ₅的形成炉渣中存在的低价氧化物氧化产生的气相。由于气相和炉渣之间的低表面张力，该气相将在熔融炉渣的本体相中形成微气泡，从而增加了接触表面。同时，坩埚材料将溶解在炉渣中，导致炉渣粘度增加。由于大块炉渣的高炉渣粘度，形成的这些微气泡将难以聚结并到达炉渣表面。通过真空去除使气泡逃逸到气相中。