效率分析
(上海大學上海市現(xiàn)代冶金與材料制備重點實驗室， 上海 200072)
摘 要: 提出了電熔劑凈化金屬熔體技術，利用電流通過細束金屬流時產(chǎn)生的電磁擠壓力去除非金屬夾雜物。 采用活塞流模型， 對夾雜物凈化效率進行了理論計算。 結果表明， 增加電流強度、 降低金屬液流速、 降低流束直徑可以提高夾雜物去除效率，而降低流束直徑還可以縮短夾雜物遷移距離， 因此對提高夾雜物去除效果更為有利。 采用含碳化硅鋁熔體進行了驗證實驗， 證明施加電流能使非金屬夾雜物遷移至鋁熔體表面。理論計算和實驗證明夾雜物的電磁遷移是電熔劑凈化技術中的主要機理。
關鍵字: 電熔劑； 凈化； 金屬熔體； 電磁擠壓力
purifying molten metal by electro-flux method
DENG Kang, XU Kuang-di
（ 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
