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Aluminum Melt Filtration

2021-11-24 13:57:53

The control of impurity elements in aluminum-based alloys has become more and more important in the production of primary and secondary alloys. In the production of primary alloys, the concentration of Ni and V in coke is rising, which causes the level of impurities in the final product to increase beyond specifications. Due to the absorption of elements such as Fe from the pollutants in the waste, this will have an adverse effect on the properties of the alloy, so it is also necessary to pay attention to the control of impurities in the recycling.

The process of removing impurities and inclusions from the aluminum melt in the foundry includes fluxing, flotation and filtration.

The key casting process used by primary aluminum and secondary aluminum foundries is direct cold casting of forged alloy products and open mold conveying casting of remelted ingots. Process economy and product quality depend on the heat and fluid flow behavior during the casting process. The current state of the art using melt refining technology to control melt impurities (sodium, inclusions and hydrogen) is given.

Foam ceramic filters are mainly used in metallurgy and foundry industries. The products have the characteristics of large surface area, high mechanical strength, and good thermal shock resistance. In the molten metal casting process, the foam ceramic filter can filter out impurities, reduce the porosity of the casting, and improve the quality of the casting, thereby reducing the casting cost and improving labor productivity. Remove slag and other inclusions. The ceramic foam filter improves the quality of the molten metal flow. The stable and rapid laminar molten metal flow prevents air from entering the molten metal flow and prevents the molten metal from being oxidized and splashed.

The ceramic foam filter (CFF) is a disposable filter made of tough porous ceramic foam with strict pore size control. Due to simple operation and good short-term operation results, these are usually the only filtration equipment in many foundries.

The three key parameters of CFF are:

Filter area-the larger the area, the greater the potential metal flow.
Pore size-the smaller the pore size, the higher the filtration efficiency.
Thickness-The thicker the filter, the better the filtration efficiency.

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