Mechanism of filtration equipment

Ceramic foam filter through 3 kinds of physical and chemical effects on liquid metal, the separation of liquid inclusions in the alloy casting, to achieve the purpose of purifying liquid metal effect.

1) mechanism of ceramic foam filter cake: complex structure, can efficiently mechanical slag, when the liquid metal through the ceramic foam filter structure is complex, the separation effect through a filter medium mechanical filter, the filter surface inclusions than perforations, and make sedimentation in the filter liquid metal inflow end, become a part of filter. With the inclusion in the filter surface accumulation quantity increase, and gradually formed a layer of "cake", so that the flow of liquid metal further thinning, the surface of the filter media and the new can remove more small inclusions, at the same time, also has the function of filtration medium inside, in many small holes throughout the ceramic body, some are tiny slit, being dead, these changes in different regions are likely to position intercepted inclusions, the inside of the filter has the "cake" effect.

2) surface effect: when the liquid metal flows through the ceramic body with complex structure, is divided into many small streams, increasing the contact area of inclusion and the filter medium in the metal liquid and the probability of contact, because the filter surface is convex concave, concave block size is about 1~10 m, static adsorption and adhesion closure effect on inclusion.

3) rectification effect: through a liquid metal ceramic foam filter, is divided into many small streams unit, its diameter is smaller, so that the Reynolds number (Re=vd/r) smaller, so that the liquid flow tends to be laminar flow. When the liquid metal in the laminar flow, because the molten metal liquid density is far greater than the density of the inclusions, so that there is sufficient time to remove inclusions floating, i.e. the ceramic foam filter can assist the runner slag. Place the filters in gating system, liquid metal flow power increased, the liquid metal flow in the runner in the easy to form full of movement, and makes the flow rate decreases, facilitates the inclusion floatation, and stayed in the top surface of the runner.

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