In order to improve the melt quality, it is necessary to understand the purification mechanism of molten metal. The melting degassing process in molten metal purification is complementary. In the process of degassing, slag removal is also carried out, and the slag removal is conducive to degassing. At present, the melting degassing of aluminum processing is basically carried out by float method, and the slag is removed by ceramic filter plate.
In the purification methods of aluminum melt which are mainly used to remove impurities, the filtration method is usually carried out after degassing and before pouring (such as placing the filter screen at the gate or runner, etc.), and the mechanism of impurity removal is mainly mechanical and mechanical. Physical function has no significant effect on the removal of fine inclusions suspended in the melt, and it is difficult to realize the principle of removing impurities first and then degassing.
Flux method has a good effect on the removal of impurities, but the removal effect of impurities depends on the characteristics of flux itself and purification process conditions to a large extent. The traditional treatment method is pressing method or covering method. It is easy to cause “dead angle” due to poor purification process conditions, and it is difficult to play the role of flux. Although the spray flux method has been developed, the method has significantly improved the purification conditions, but it requires special equipment, increased cost and unstable process control in actual production.
Therefore, it is very important to use cheap and available fluxes to effectively purify aluminum melt and simplify the process. After years of research and practice, we have obtained a new purification method, i.e. high efficiency active flux filtration purification method. It combines melting, flux removal and flux filtration functions, and can realize the whole smelting process without special equipment. The process is simple, the operation is convenient and the cost is low.
The purification effect is remarkable. The removal rate of impurities is about 80%, and the pinhole rate is significantly reduced. If you add degassing, the effect will be more significant. It has been applied in a series of researches such as waste aluminum recycling technology, localization of high performance materials (can making materials) and inferior materials. It is an advanced and effective purification method for aluminum liquid, and the developed high-efficiency impurity removal flux has little environmental pollution. Recently, we have developed efficient flux and spray flux for industrial pure aluminum.