Ceramsite is the custom ceramicparticles with a spherical shape, high refractoriness and low thermal expansionbeing made by spraying the melted calcined bauxite. It provides a very simple butefficient way for the foundry-men to improving the quality of the castings,reducing the production cost and avoiding environmentalpollution, because of that it has the higher price ratio comparing with Chromite sandand Zircon sand. At thepresent, Ceramsite is acknowledged in the worldwide as the newest and the best idealsand for the foundries and has a very wide feasibility of applications for the futuredevelopment.
Ⅱ.CERAMSITE advantages are as follows
Solid sphere: The shape of Ceramsite is spherical with smooth surface and less surface area and offering a very good flowability and filling ability. To compare with other sands else, less binder is used at the same mold strength and higher venting ability. It also offers the excellent collapsibility.
Lower thermal expansion rate: It makes the dimensions of castings better, less crack and defect and higher output.
Lower breakage rate: Ceramsite has a higher density and a very lower breakage rate at the reclaimation. It makes a better reclaimation rate to reduce the waste sand to be favor to the environment.
High refractoriness: The major chemistry is Al2O3. PH appears neutral. It belongs to the refractoriness of the series of Aluminum and Silicon which has a very good refractory performance. It is suitable for all kinds of metal and alloy castings.