Ceramic honeycomb Filters slice for the metal melting now are extensively applied to the metallurgic plants of casting/foundry, for example,steel, iron, copper and aluminum, etc. Because of its high mechanical intensity and heat-resistance, it is used to get rid of the metal impurity, refractory scrap, solid refractory alloy, sinter, in the molten metal liquid when casting the products, so as to reduce the air vent of casting, improve the quality of casting and also reduce the casting cost.