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在实验室用钠盐处理含钒铁水过程中,应用ZrO_2基固体电解质氧浓差电池同时测定铁水内部和渣-铁界面氧位。实验表明,处理过程中铁水内部氧位几平没有变化,而界面氧位在加入添加剂后,由原来的0.00005～0.00015迅速升高到0.00094～0.00224,相应地,铁水中钒、磷、硫、钛等元素迅速氧化而脱除。随着界面氧位降低到0.00016～0.0004时,各元素脱除速率也降到最低值(硅除外),氧位再降低时,即产生回钒、磷、硫的现象。土碱、碳酸钠、碳酸钠十三氧化二铁等添加剂都能使界面氧位提高,其中以加入碳酸钠十三氧化二铁系时氧位水平最高。由于界面氧位与铁水中各元素的含量及其脱除速率有良好的对应关系,并能反映出添加剂的氧化性,所以界面氧位是表征界面状态的重要因子。实验还表明发生脱钒、磷反应的地点是界面。
In the process of treating vanadium - bearing hot metal with sodium salt in laboratory, ZrO2 - based solid electrolyte oxygen concentration cell was used to simultaneously determine the oxygen level in the interior of molten iron and the interface between slag and iron. The experiments show that there is no change in the oxygen level inside the molten iron during the treatment, but the oxygen level at the interface rapidly increases from 0.00005 to 0.00015 to 0.00094 to 0.00224 after the additive is added. Correspondingly, the vanadium, phosphorus, sulfur, titanium Other elements such as rapid oxidation and removal. As the interface oxygen level decreased to 0.00016 ~ 0.0004, the removal rate of each element was also reduced to the lowest (except for silicon). When the oxygen level decreased again, vanadium, phosphorus and sulfur were recovered. Soil alkali, sodium carbonate, sodium sesquatite and other additives can make the interface oxygen level increased, which was added to sodium ferric decahydrate when oxygen level highest. The interface oxygen level is an important factor to characterize the interfacial state because the interface oxygen level has a good correspondence with the content of each element in molten iron and its removal rate, and can reflect the oxidizability of the additive. Experiments also show that the occurrence of de-vanadium, phosphorus reaction is the interface.