As we all know, aluminum purification treatment is generally divided into furnace purification and online purification according to the time sequence of its purification treatment. Furnace refining refers to the process in which the aluminum alloy melt is refined in the furnace to achieve the effect of purifying the aluminum alloy melt. Its working principle is: the gas and the impurities in the aluminum alloy melt are chemically reacted to achieve impurity and liquid purification methods, mainly including online deaeration and online filtration (such as rotary degassing system and CFF filtering system).
Aluminum Purification Treatment
The acquisition of high-quality metallurgical melt before solidification requires a good match between furnace purification and online purification. However, it should be noted that the online purification of molten aluminum is a continuous process. The residence time of molten aluminum in the purification equipment is limited, resulting in aluminum liquid quality control process has a narrow window, and its purification effect is overly dependent on equipment. At the same time, it also has a bottleneck in the amount of molten aluminum. At the same time, online purification is more sensitive to the purification in the furnace. If the degree of purification of the molten aluminum in the furnace cannot meet the requirements of the subsequent process, it will have a great impact on the online purification. The online purification efficiency of the molten aluminum is drastically reduced, and the subsequent casting cannot be guaranteed the metallurgical quality of the billet.
In addition, incomplete purification in the furnace will reduce the unit aluminum liquid processing capacity of the online purification device, and the purification effect cannot be guaranteed. In addition, the processing objects of furnace purification and online purification have their own emphasis. From the perspective of the size of inclusions, the processing objects of furnace purification are generally large-size inclusions with a particle size greater than 40μm. On-line purification is mainly for the small particle inclusions. Efficient furnace purification is of great benefit to the service life and purification efficiency of the online purification device. Therefore, high-efficiency furnace purification is a key process in the purification of aluminum melt, and it can also create favorable conditions for subsequent online purification. Online purification is an effective supplement to furnace purification and can further purify molten aluminum. The two influence and interact with each other.