Ceramic Foam Filters For Foundry have good chemical stability, high specific strength, high temperature resistance, thermal shock, large specific surface area, and many other advantages. They are widely used in metallurgy, chemical industry, environmental protection and other fields. In metallurgy, Ceramic Foam Filter is one of the effective methods to purify the aluminum melt. The study shows that ceramic foam filter also can reduce the content of hydrogen in the aluminum melt. Because of its good effect of slag, simple operation, easy to match with other parts, the cost is low, in the aluminum processing industry has become a routine purification method. As the requirement for the quality of aluminum is higher and higher, more and more is also high to the requirement of the ceramic foam filter plate.
Structure of Ceramic Foam Filters For Foundry
Ceramic Foam Filter manufacturing process is usually the polyurethane sponge in ceramic slurry, squeeze out excess, dry, and finally under the high-temperature burning, knot, formed a related to the original bubble structure of three-dimensional porous ceramic material.
Consider the filtration efficiency and intensity, the preparation of ceramic foam filters is no longer a three-dimensional reticular structure. But interconnected and winding and uneven thickness of the pipe. This kind of uneven wall plays a key role on capturing the tiny inclusions in the aluminum melt, this is the deep bed filter. This is a fundamental difference between the screen and the Ceramic Foam Filter For Casting plate. This three-dimensional network structure increases the flow path of the molten aluminum, makes the aluminum melt contact the filter plate, and increases the adsorption capacity of the inclusion particles.
Ceramic Foam Filter Filtering Mechanism
The main purpose of Ceramic Foam Filters For Foundry is to remove inclusions in the aluminum melt. Inclusions in the melt usually exist in three forms: metal oxide, refractory pulverized, and other foreign particles, the introduction particles during the smelting processing.
There are three ways to remove the suspended particles in the melt:
- Sedimentation – particle accumulation at the bottom of the melt.
- Floating – a mixed floating gathered in the melt surface.
- Filter – separate particles from the melt through the porous medium.
Natural sedimentation generally occur in the case of large particle density and coarser, less than 90 um of particles on the static settling is not very effective. When degassing, the bubble can put the inclusion particles to the surface of the melt, the mechanism can’t remove 30-40 um small inclusions. The advantage of Ceramic Foam Filter For Casting is that it can remove than its hole diameter much smaller inclusion particles. Ceramic Foam Filters separate inclusions by screening (sieving), sediments (cake), deep bed filtration (deep bed) these three mechanisms.