Casting equipment is not a single ore, but the mixture, mainly by the natural water-containing alumina (that is boehmite) and kaolinite composed of high-alumina refractories. China's bauxite reserves, distribution is very extensive, especially in Henan, Hebei, Guizhou famous. Bauxite according to its chemical composition can be divided into three after years of production practice has proved that bauxite for precision casting shell has the following advantages
Automatic injection wax machine material source, the price cheaper than the quartz; domestic Henan, Guizhou and other places a lot of manufacturers and good quality. High refractoriness, and good chemical stability at high temperatures. The material linear expansion coefficient is small, water does not swell, with its preparation of the paint viscosity stability, the shell size changes small. Bauxite as a porous material, the density is small, light weight, with the paint suspension is good, the production of shell permeability is good.
The use of bauxite instead of quartz material can reduce the threat of physical health of workers, but also can greatly improve the labor intensity. In view of the above, bauxite in recent years in China's application development is very fast.