Influence of Bottom Bubbling Rate on Formation of Metal Emulsion in Al-Cu Alloy and Molten Salt System
Influence of Bottom Bubbling Rate on Formation of Metal Emulsion in Al-Cu Alloy and Molten Salt System
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DOI：
10.2355/isijinternational.52.1018
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发表时间：
2012-01-01
影响因子：
1.8
通讯作者：
Matsuo, Michitaka
中科院分区：
文献类型：
--
作者：
Song, Duk-Yong;Maruoka, Nobuhiro;Matsuo, Michitaka
在钢铁精炼过程中，通过金属液滴乳化到炉渣中，即所谓的“金属乳液”，增加金属与炉渣之间的界面面积，是提高反应速率的一种主流观点。以铝铜合金为金属相，氯化盐为渣相，在底鼓泡条件下对金属乳液的形成进行了实验研究。从容器中盐相的中心收集样品。大量的金属液滴通过将盐溶解在水中而从盐中分离出来。液滴的数量、表面积和重量随气体流量的增加而增加，并存在局部极大值。金属液滴的形成和沉降速率估计使用的数学模型。生成速率随气体流量的增加而增加，并存在一个局部极大值，而沉降速率与气体流量无关。利用高速摄影机观察了气泡周围金属膜破裂形成金属乳状液的三种方式。在此过程中，随着气体流量的增加，观察到一个细长的圆柱体覆盖着金属膜。该细长柱有时达到盐相的顶面。在这种情况下，认为没有形成细液滴，因此，在较高的气体流速下，金属乳液的重量降低。
In steel refining process, an increase of interfacial area between the metal and slag through the metal droplets emulsified into the slag, so-called "metal emulsion", is one prevailing view for improving the reaction rate. The formation of metal emulsion was experimentally evaluated using Al-Cu alloy as metal phase and chloride salt as slag phase under the bottom bubbling condition. Samples were collected from the center of the salt phase in the container. Large number of metal droplets were separated from the salt by dissolving it into water. The number, surface area, and weight of the droplets increased with the gas flow rate and have local maximum values. The formation and sedimentation rates of metal droplets were estimated using a mathematical model. The formation rate increased with the gas flow rate and has a local maximum value as a function of gas flow rate, while the sedimentation rate is independent of the gas flow rate under the bottom bubbling condition. Three types of formation mode of metal emulsion, which occurred by the rupture of metal film around the bubble, were observed using high speed camera. During the process, an elongated column covered with metal film was observed with the increasing gas flow rate. This elongated column sometimes reached to the top surface of the salt phase. In this case, it is considered that fine droplets were not formed and in consequence, the weight of metal emulsion decreased at higher gas flow rate.