USE OF PHOSPHORIC ACID FOR REDUCING THE AMOUNT OF FREE DISPERSANT IN A METHOD FOR CONCENTRATING CALCIUM CARBONATE IN WATER

摘要

The invention relates to the use of phosphoric acid in a method for concentrating an aqueous dispersion or suspension of calcium carbonate in the presence of at least one acrylic dispersant, as an agent for reducing the amount of free dispersant, i.e. the fraction of the acrylic dispersant not adsorbed at the surface of the calcium carbonate particles and present in the aqueous phase. The invention also relates to aqueous dispersions and suspensions of calcium carbonate having a reduced free dispersant content.