效率分析
(上海大学上海市现代冶金与材料制备重点实验室， 上海 200072)
摘 要: 提出了电熔剂净化金属熔体技术，利用电流通过细束金属流时产生的电磁挤压力去除非金属夹杂物。 采用活塞流模型， 对夹杂物净化效率进行了理论计算。 结果表明， 增加电流强度、 降低金属液流速、 降低流束直径可以提高夹杂物去除效率，而降低流束直径还可以缩短夹杂物迁移距离， 因此对提高夹杂物去除效果更为有利。 采用含碳化硅铝熔体进行了验证实验， 证明施加电流能使非金属夹杂物迁移至铝熔体表面。理论计算和实验证明夹杂物的电磁迁移是电熔剂净化技术中的主要机理。
关键字: 电熔剂； 净化； 金属熔体； 电磁挤压力
purifying molten metal by electro-flux method
（ Shanghai Enhanced Laboratory of Modern Metallurgy and Material Processing,
Shanghai University, Shanghai 200072, China）
Abstract: The pinch force due to galvanization of electric current in small liquid metal flow plays the main role of removing inclusions during the technology of purifying molten metal by electro-flux method. By using plug flow model, the theoretical inclusion-removal efficiency is calculated, and the results show that the inclusion-removal efficiency can be increased by increasing current density, reducing flow rate of molten metal and the diameter of the metal flow. Further more, if reducing the diameter of the metal flow, the inclusion can migrate short way, which is more helpful to increasing the inclusion-removal efficiency. The experiment of separating carborundum particles from molten aluminum was carried out, and it was proved that the inclusions would migrate to the surface of the molten aluminum by imposing alternative current. The results of calculation and experiment proved that the electromagnetic migration of the inclusions is the main mechanism of the electro-flux method.
Key words: electro-flux; purification; molten metal; electromagnetic pinch force
