Spontaneous Emulsification of a Metal Drop Immersed in Slag Due to Dephosphorization: Surface Area Quantification
Spontaneous Emulsification of a Metal Drop Immersed in Slag Due to Dephosphorization: Surface Area Quantification
复制标题
由于脱磷而浸没在炉渣中的金属滴的自发乳化：表面积定量
DOI：
10.1007/s11663-014-0248-z
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
S. Sridhar
中科院分区：
文献类型：
--
作者：
A. N. Assis;J. Warnett;S. Spooner;R. Fruehan;M. Williams;S. Sridhar
当两种不相容的液体发生化学反应时，液-液界面处不断发生传质。几项研究表明，如果两种液体之间交换的物种是表面活性的，界面张力可能会非常显著地下降，这可能会导致一种称为自发乳化的现象。在炼钢中，已经观察到了几个反应，涉及将杂质从钢水转移到熔融的氧化渣中，但几乎没有进行量化。本工作主要研究了浸入碱性氧炉型炉渣中的铁磷液滴的脱磷自发乳化作用。利用共焦扫描激光显微镜上的Au成像炉在不同的时间快速加热和冷却样品，并使用X射线计算机层析成像技术对允许渣/钢反应发生不同时间的样品进行表面积计算。结果表明，在反应的前60秒内，当化学反应发生得很快时，金属液滴的表面积迅速增加了一个数量级以上。一旦反应放缓，大约在60秒后，液滴开始重新聚集在一起，最大限度地减少表面积，并返回到接近其平衡形状的几何形状。
When a chemical reaction occurs between two immiscible liquids, mass transfer is continuously taking place at the liquid–liquid interface. Several studies have shown that if the species being exchanged between the two liquids are surface-active, a very pronounced decrease in interfacial tension can occur which can lead to a phenomenon called spontaneous emulsification. In steelmaking, this behavior has been observed for several reactions that involve the transfer of impurities from molten steel to a molten-oxide slag but little quantification has been made. This work focuses on spontaneous emulsification due to the dephosphorization of a Fe-P drop immersed in a basic oxygen furnace type slag. An Au-image furnace attached to a confocal scanning laser microscope was used to rapidly heat and cool the samples at different times, and X-ray computerized tomography was used to perform the surface area calculations of the samples where the slag/steel reaction was allowed to occur for distinct times. The results show that the surface area of the metal drop rapidly increases by over one order of magnitude during the first 60 seconds of the reaction while the chemical reaction is occurring at a fast rate. Once the reaction slows down, approximately after 60 seconds, the droplets start to coalesce back together minimizing the surface area and returning to a geometry close to its equilibrium shape.