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Calcium Carbonate Waste For Cement

A new type of process for producing highpurity calcium carbonate from waste cement powder was developed. The process consists of two main reactions extraction of calcium in the form of calcium ions from waste cement powder in a water slurry by pressurized CO 2 typically at several MPa, and precipitation of calcium carbonate CaCO 3 from the extracted solution by reduction of the CO 2 ...

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