What Is Cement? Manufacturing, Composition amp; their
#0183;#32;Manufacturing Of Portland Cement. The 3 primary constituents of the raw materials used in the manufacture of Portland Cement are: a) Lime b) Silica c) Alumina; Lime is derived from limestone or chalk. Silica amp; Alumina from clay, shale or bauxite . There are 2 chief aspects of the manufacturing process