With the main ingredients of CaO, SiO2, Fe2O3, the Al2O3 according to proper proportion of raw materials, ground into a fine powder, and burned to partial melting, provided that the product of calcium silicate as the main mineral composition. The main mineral of C3S and C2S, C3A, C4AF, containing a small amount of f - CaO and other minerals. Look for green gray ball the size of a marble.
mainly used for grinding General Portland cement.
(4) the quality:
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