Continuous molten metal degassing equipment is used to remove hydrogen and slags from molten aluminum, so as to improve the quality of ingots.
The smelting of casting alloys is an indispensable process in the production process of aluminum castings, which is an important factor that determines the quality and cost of castings. Many performance indicators of castings are largely determined by the chemical composition, temperature, and purity of the molten metal. Many defects of castings, such as pores, slag inclusions, shrinkage holes, cold barriers, hot cracks, etc., are more or less related to the quality of molten metal.
To obtain high-quality castings, there must be high-quality molten metal. Continuous molten metal processing equipment includes degassing and filtering equipment. It can improve the quality of molten metal.
The two methods of degassing and filtration are complementary. Slag and gas cannot be completely separated. Generally, the more inclusions, the higher the gas content in the melt. In the degassing process, the inclusions in the melt must be removed at the same time. While removing the inclusions, the gas content in the melt will inevitably decrease.
The molten metal degassing device can not only be used for can materials and thin foil materials, but also can meet the high-tech requirements of aviation equipment and storage disk manufacturing. Aluminum foundries mainly use ceramic foam filtering equipment for molten metal filtering. CFF filtering system has been widely used in actual production. They are very common in-line filtration systems for the production of standard products (rolled slab or squeeze billet casting).
CFF ceramic foam filters are popular because of their small size, compact structure and easy use. In order to improve filtration accuracy, the pore size of the filter plate has developed from 20-50 PPI to 60 PPI, 70 PPI, and a composite filter plate appears, that is, the filter plate is divided into upper and lower layers, with a large pore size on the top and small pore size on the bottom. Varieties and specifications are 30/50 PPI, 30/60 PPI, 30/70 PPI. The composite filter plate has a good filtering effect and a large amount of metal passes through.