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How to select suitable ceramic foam filter plates to improve the cleanliness of aluminum melt

2022-09-06

How to select suitable ceramic foam filter plates to improve the cleanliness of aluminum melt

ceramic foam filter

(1) The selection of ceramic foam filter plates should first be determined according to the impurity content in the aluminum melt, the melt transfer flow rate, and the quality requirements of cast aluminum products.


1. The aluminum melt contains a lot of impurities, and the quality requirements of the cast products are general, you can choose a ceramic foam filter plate with a larger hole mesh, and add a glass cloth in front of the filter plate for coarse filtration. In this case, it is important to use glass wool cloth for coarse filtration when casting aluminum melt semi-continuously. It can intercept the slag flowing out when the furnace is opened and the slag washed off on the launder to prevent the filter plate from being blocked. "


2. When the quality requirements of casting products are high, a new generation of ceramic foam filter plates with small holes and large meshes are used. For example, Fujian Ruimin Aluminum Company and Nanfang Aluminum Company produce aluminum foil blanks, Henan Mingtai Aluminum Company Produces high-quality hot-rolled slabs, Northeast Light Alloy Processing Plant produces high-quality military aluminum materials, and Guangdong Zhongshan Hesheng Aluminum Co., Ltd. produces high-quality industrial aluminum profiles. The second-generation ceramic foam filter plate, if the specifications of 30ppi and 60ppi are 305mm*305mm*50mm, 381mm*381mm*50mm, 432mm*432mm*50mm, 508mm*508mm*50mm for double-stage filtration, the aluminum melt is more Can achieve ideal cleanliness.


3. The selection of filter plate specifications is determined by the flow rate of aluminum melt per unit time and the total throughput of aluminum melt. If the flow rate is large and the total throughput is large, and the aperture of the filter plate is small, the larger size filter plate is selected.


(2) When choosing a filter plate, you should also observe its color, shoot its body, and burn its objects.


1. The color of the filter plate is pure and free of impurities, indicating that the material is uniform; it is sticky but not sticky, indicating that the surface is not sprayed with adhesive, which will not cause secondary pollution of aluminum liquid. "

2. Hold the filter plate with one hand, and tap the filter plate with the other hand in a clapping style, and continuously drop the ceramsite, it is an inferior filter plate, which will cause secondary pollution of molten aluminum.

3. Use an open flame or electric heating to heat the filter plate to red, and immediately cool it at room temperature without cracking and slag, it is a good filter plate.


(3) The effective specific surface area or porosity of the foam should be carefully evaluated when purchasing filter plates. You can observe the uniformity of the mesh on the surface layer of the filter plate, and then cut it open to observe the uniformity of the mesh on the section. If possible, the porosity can be calculated by the drainage method. If the three-dimensional mesh is uniform and the porosity is relatively large, it is an excellent ceramic foam filter plate.


Conclusion


Ceramic foam filter filtration is the last step in the purification of aluminum melt, and it is particularly important to choose the second generation of ceramic foam filter plates. What needs to be specially pointed out is to prevent the secondary pollution of the melt that may occur during the process of solidification and molding after the aluminum melt leaves the filter box. In this process, the sintered flow tank, front box, distribution plate, and hot cap made of fused silica ceramics with long life, high strength, non-stick aluminum, and good thermal insulation are used, and dehumidified and cleaned in time to eliminate possible pollution sources. , to ensure the cleanliness of the aluminum melt can not be ignored.