The quality of the aluminum melt largely determines the quality of the final product. In particular, there are two or more electrolytic aluminum liquids (more hydrogen content, more inclusions) and one less (less active crystal nuclei). If the process is improper, it will cause the cast-rolled coil produced with liquid material ingredients to have more pores and slag inclusions. Many, coarse grains and other quality issues. The use of advanced aluminum melt processing technology is of great significance to improving the quality of aluminum melt.
Aluminum melt processing technology includes: grain refinement, refining degassing, and filtration.
The grain refinement technology mainly includes two methods: adding aluminum-titanium master alloy inside the furnace and adding aluminum-titanium-boron wire rods outside the furnace. The addition of aluminum-titanium master alloy in the furnace not only uses a large amount of master alloy, but also the grain refining effect decays as the melt stays in the furnace for a longer time, and finally even loses the grain refining effect.
On-line degassing treatment outside the furnace can not only overcome the above shortcomings, but also reduce the amount of master alloy added by more than half. The fine grains and uniform refining and degassing can be divided into two methods: in-furnace treatment and out-of-furnace treatment. The use of on-line processing technology outside the furnace can not only reduce or avoid secondary pollution of the melt, improve product quality, but also reduce the labor intensity of workers.
Melt filtration is the most effective and reliable method to remove non-metallic inclusions in aluminum alloy melt. Melt filtration includes mesh filtration, foam ceramic plate filtration, and microporous ceramic tube filtration. Currently, foam ceramic plate filtration is widely used. The current aluminum melt processing technology has been developed from a single degassing or filtration in the past to a continuous processing technology combining degassing and filtration. In the same processing device, both the degassing function and the filtering function are provided, and these two functions are performed simultaneously and continuously. In order to improve the quality of aluminum materials, high-quality aluminum materials often use a combination of in-furnace and out-of-furnace treatment.
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