Due to the relatively high content of alkali metals in the electrolytic aluminum liquid, the refining process needs to be strengthened.
Electrolytic Aluminum Refining Process
Use 5%~10% concentration of chlorine and argon to refine the furnace for no less than 15 minutes, or use high-quality refining agents for multiple refining.
After the flux refining is completed, a certain amount of Ti is added to the smelting furnace ingredients, and the smelting furnace is allowed to stand for more than 30 minutes to promote the early precipitation of Ti and harmful trace elements. When converting the furnace, avoid completely transferring the molten aluminum at the bottom of the furnace to ensure that the molten aluminum transferred into the holding furnace is relatively clean.
After smelting is optimized and strengthened through a series of processes, the molten aluminum that is transferred into the holding furnace and enters the cast-rolling mill train is relatively clean. In order to further improve the quality of molten aluminum, it is particularly important to check the quality of the online aluminum titanium boron wire. Due to the TiB2 in the aluminum titanium boron, the particles themselves are one of the slag inclusions. Choosing poor quality aluminum titanium boron wires will inherently bring a greater risk of slag inclusions and also affect the grain refinement effect.
Online degassing is critical to ensuring the hydrogen content of the melt, and the shape of the degassing impeller is optimized to strengthen the sealing of the degassing furnace cover. At the same time, the installation of a dust extraction device at the exhaust port of the degassing furnace has a good effect on improving the working conditions of the degassing furnace and improving the efficiency of degassing. After the optimized degassing furnace treatment, the hydrogen content of every 100g Al melt can be reduced to less than 0.12ml, and the hydrogen content is even lower than some manufacturers using all solid materials, which effectively guarantees the product quality.
Due to the poor quality of the electrolytic aluminum melt, it will cause a greater burden on the ceramic foam filter plate and cause it to be easily clogged. The vibration of the replacement process and the insufficient infiltration of the filter at the beginning of the use may cause quality fluctuations. In order to solve this problem, a two-stage combination of 17 inches (43.18 cm) and 15 inches (38.10 cm) of large filter plates is used, which effectively increases the filtering area and strengthens its filtering effect.