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Jan 07, 2021 Cement Manufacturing Process Flow Chart. 2021-01-07. e.g. fly ash, silica fume and burnt shale. 90-150 kWh t cement are used in the process. Raw Materials In Cement Manufacture (1) Limestone Contains predominantly calcium carbonate (CaCO3) and to use in cement manufacture, it should have 42-43 lime (CaO) minimum. Why Raymond Mill Is.