The ceramic foam filter is provided in the plate filter box, and may have an inclined outer peripheral surface adapted to cooperate with a correspondingly configured peripheral edge and mating. The inclined outer peripheral surface is provided with an elastic sealing device thereon, the sealing device is resistant to molten metal, and the corresponding filter medium including the sealing device is respectively attached to the sealing device to engage the rim and the corresponding inclined surface respectively.
The refractory flux and plate filter box in the area of the chamber is provided with a cast ceramic distributor plate with multiple orifices for introducing flux gas from an unshown external source from the inlet and the plenum. When the molten metal passes through the chamber, it enters into the molten metal.
Compared with conventional methods and equipment for introducing flux gas into molten metal, the use of cast ceramic foam filter plates has obvious advantages. In order to optimize the efficiency of the degassing process, that is, to maximize the efficiency of the adsorption reaction kinetics, the introduction of flux gas into the melt should be optimized to provide the smallest bubbles. Size and maximum bubble density, while eliminating bubble coalescence. Therefore, the average distance between the holes on the distribution plate should be controlled to prevent the flux bubbles from coalescing, while minimizing the diffusion distance of gaseous impurities that must pass through the melt to reach the bubbles.
In order to maximize the surface area of the adsorption reaction, the pores should be made as small as possible while preventing the pores from being blocked by metal during multiple uses. Preferably, pore sizes in the range of 0.010″ to 0.20″ degas molten aluminum and aluminum alloys. Maintain sufficient distance between bubbles to prevent bubbles from coalescing. Maximum dispersion of bubbles is critical. When degassing molten aluminum and its alloys, it was found that the spacing between pores is in the range of 0.25″ to 5.00″, 0.75″ to 2.00″ is the best.
