i dnt no
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http://www.master-srl.net/en/machine-for-biodegradable-clay-pigeons-smart.html
Clay is introduced to the sand for the sand to help mantain its shape when forming. and it make the mould hard and to retain the casting the clay is tow types one is active clay and dead clay
you make it by mixing limestone powder and clay in a kiln
clayUsually clay. Kaolin, shale, and minerals are also used to make bricks. If u only use clay it will not be that strong to build a house or something big.
The materials used to make cement are,Calcareous materials (limestone)Argillaceous materials (clay)gypsumCoal dustIron oxidemagnesiumAlkalies