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cost of a peeper coal gangue mining agent

The invention provides fire retardant coating for an underground coal seam of a coal mine, comprising the following compositions in parts by weight: 74 to 140 parts of powder materials, and 15 to 56 parts of polymer emulsion. The powder materials comprise the following compositions in parts by weight: 30 to 50 parts of high quality cement, 7 to 10 parts of expanded perlite, 5 to 10 parts of ...

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