COMPOSITE MATERIAL CONTAINING CALCIUM CARBONATE WITH MODIFIED SURFACE, METHOD OF PURIFICATION OF WASTE WATER AND USE OF CALCIUM CARBONATE WITH MODIFIED SURFACE FOR PURIFICATION OF WASTE WATER

摘要

The present invention relates to a process for the purification of water, wherein a surface-reacted natural calcium carbonate is brought into contact with the water to be purified, the surface-reacted natural calcium carbonate being the reaction product of a natural calcium carbonate with an acid and carbon dioxide, which is formed in situ by the acid treatment and/or supplied externally.