Ceramic foam filter plates for foundry are used for metal liquid filtration, especially for filtering aluminum and aluminum alloy liquids.
The oxides and slag produced in the metal smelting process may contain other inclusions in the solid materials added to the furnace. The conventional method of removing inclusions is to refine the slag with flux, but it is impossible to completely remove the suspended solids in the metal liquid.
In recent years, ceramic foam filters (CFFs) have been used to filter metal liquids, especially in the aluminum processing industry.
Features of Ceramic Foam Filter Plates for Foundry
- It has accurate porosity so that it can be selected according to the filtration accuracy and flow rate, and has a certain degree of air permeability.
- Has a certain sintering strength.
- The surface hardness of the filter plate should be high.
- The filter has high chemical stability and will not react with aluminum at high temperatures.
The principle of the installation position of the CFF filter should prevent the filtered aluminum melt from flowing into the crystallizer without tipping over. For the horizontal flow channel, since the oxide film in the flow channel is continuous, the installation position of the filter does not have to be very close to the crystallizer. Before installing the filter, tap the filter to remove the remaining ceramic debris and remove the debris in the runner to avoid clogging the filter. The combination between the installed filter and the launder must not leak.
The metal foam filter in the filter box can intercept large and small particles and form surface deposits. In addition to considering the actual production quality requirements of aluminum products, the selection of aluminum foam filters must also consider the aluminum flow rate of the sink during the casting and rolling process, the total amount of filtration, the cleanliness of the aluminum liquid itself, and the production cost. Choosing a filter plate with too high specifications will increase costs and reduce production efficiency.
When filtering with ceramic foam filter plates for foundry, the CFF filter in the filter box can intercept large and small particles as the surface deposits are formed. When the adsorbed particles reach saturation, that is, when the number of particles adsorbed from the melt is equal to the number of particles carried away by the flowing melt, the slag removal ability decreases. It needs to be replaced with a new ceramic foam filter.