How to improve the service life of refractory materials for aluminum melting furnace?

      From the perspective of material design, add components that can effectively limit penetration to the batch, such as graphite, SiC,SiO₂，Si₂ON₂, Si₃N₄, B₄C, BN, 9Al₂O₃·2B₂O₃ and Al₂O₃·TiO₂ and the like can greatly improve the resistance of refractories to structural peeling.

      By optimizing the corundum refractory particles, adding non-oxides in appropriate quantities, selecting high-quality binders, and adopting high-pressure forming, composite corundum refractories (products) with better performance can be obtained. When used in melting furnaces, these high-performance composite corundum products can limit the penetration of molten aluminum, reduce structural spalling and damage, and improve the service life of refractories.

      By optimizing the particle distribution of refractories and the application of micropowders, the permeation of molten aluminum can be limited by manufacturing refractories with an average pore size of no more than 0.5 microns (not exceeding the critical pore diameter of molten aluminum permeability) and low air permeability.

      According to the melted product and operating conditions, it is considered that the refractory material lined with the melting furnace can be selected as SiO2-Al2O3 refractory. Considering that the alloying elements in metal aluminum and aluminum alloys have a strong reducing ability to SiO2, SiO2-Al2O3 refractory materials with high Al2O3 content (such as bauxite refractories and corundum refractories) should be selected. In terms of structure, high aluminum refractory with low air permeability and porosity diameter of less than 0.5 microns should be manufactured, that is, it can be adapted to the use conditions of the melting furnace.