SURFACE-TREATED CALCIUM CARBONATE AND PHYLLOSILICATE AND ITS USE IN WATER PURIFICATION

摘要

The invention relates to a process for the purification of water and/or dewatering of sludges and/or sediments, to the use of a combination of a phyllosilicate and a surface-treated calcium carbonate for water purification and/or dewatering of sludges and/or sediments, as well as to the use of a combination of a phyllosilicate and a surface-treated calcium carbonate for reducing the amount of polymeric flocculation aids in water and/or sludges and/or sediments and to a composite material comprising at least one surface-treated calcium carbonate, at least one phyllosilicate and impurities originated from different sources obtainable by said process. At least 1 % of the accessible surface area of the calcium carbonate is covered by a coating comprising at least one cationic polymer.