The ceramic foam filter buy is firstly determined according to the impurity content in the aluminum melt and the melt transfer flow rate, it determines the quality requirements of the final cast product.
There is a large amount of impurities and the quality of the casting products is average. A foam ceramic filter plate with larger mesh can be selected, and a glass cloth coarse filter is added in front of the filter plate. At this time, it is important to use glass cloth to filter the semi-continuous casting first. It can intercept the slag when the eye is opened and the slag washed down by the launder to prevent the filter plate from clogging.
The quality requirements of the casting products are high, and the new type of foam ceramic filter with small hole mesh, that is, large mesh number, is selected.
E.g:
Fujian Ruimin Aluminum and Southern Aluminum produce aluminum foil blanks, Henan Mingtai Aluminum produces high-quality hot-rolled slabs, Northeast Light Alloy Processing Plant produces high-quality military aluminum, and Guangdong Zhongshan Hesheng Aluminum produces high-quality industrial profiles All the fine products adopt the second generation foam ceramic filter plate produced by Ivans (Jiaozuo) Metallurgical Materials Co., Ltd.
The most prominent is the use of 30ppi and 60ppi specifications of 305x305x50. 381x381x50, 432x432x50, 508x508x50 two-stage filtration technology, to achieve the ideal cleanliness and obtain good results.
The ceramic foam filter buy specifications are based on the flow rate and total throughput of the melt. If the flow rate is large, the total throughput is large, and the filter plate has small holes, a larger size is used.
When choosing a filter plate, you should also observe its color, take pictures of its bodies, and burn its objects.
The color is pure and free of impurities, indicating that the material is uniform. The hands are not sticky, indicating that the surface is not sprayed with adhesive and will not cause secondary pollution.
Holding the filter plate with one hand and clapping the filter plate with the other hand, the ceramsite slag is continuously dropped, indicating that the filter plate is inferior, which will cause secondary pollution to the molten aluminum.
Use an open flame or electric heating to heat up and burn to red, immediately cool at room temperature without cracking and slag, indicating that it is a good filter plate.
When choosing filtration, carefully evaluate the effective specific surface area or porosity calculation of its foam. You can observe the uniform state of the mesh on the surface of the filter plate, and then open it to observe the uniform state of the mesh on the section. If possible, the porosity can be calculated by the drainage method. The three-dimensional mesh is homogeneous and the porosity is relatively large. It is an excellent foam ceramic filter plate.
