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is sand stones cement raw materials henan mining machinery co ltd

is sand stones cement raw materials henan mining machinery co ltd

Cementis typically made from limestone and clay or shale. Theseraw materialsare extracted from the quarry crushed to a very fine powder and then blended in the correct proportions. This blendedraw materialis called the 'rawfeed' or 'kiln feed' and is heated in a rotary kiln where it reaches a temperature of about 1400 C to 1500 C

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