Alternative uses of vermiculite powder

　　In order to enhance the flexural strength and impact strength of lightweight cement slab, the damage of lightweight cement slab in transportation and construction is prevented. Lightweight cement board with expanded vermiculite as raw material. Making method: Using expanded vermiculite as light aggregate, first mix dry expanded vermiculite with water-soluble binder evenly, then mix it into cement slurry evenly, send it to spray gun by extrusion pump, mix short fibers sprayed by atomization and fibre spray gun, and deposit them on the surface of die. Compared with light GRC board with perlite as light aggregate, it has bending resistance and impact resistance. High impact strength, low damage rate in transportation and construction process, and comprehensive cost can be reduced by 3-5%.