Surface-reacted calcium carbonate and its use in waste water treatment
AssigneeOmya International AG
InventorsPatrick A.C. Gane, Joachim Schölkopf, Daniel Gantenbein, Daniel E. Gerard
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Abstract
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.
Claims20
A composite material comprising surface-reacted natural calcium carbonate and at least one impurity selected from a heavy metal impurity, an organic impurity, a microorganism, a polycyclic compound, cholesterol, and/or an endocrine disrupting compound, adsorbed or absorbed from water comprising the impurity, wherein the surface-treated natural calcium carbonate is natural calcium carbonate from a natural source that is not saturated with heavy metals, that was treated with an acid and carbon dioxide, formed in situ or applied from an external source, in water to obtain the surface-treated natural calcium carbonate, wherein the surface-treated natural calcium carbonate has a specific surface area of from 5-200 m2/g as measured using nitrogen and BET method.
Dependencies are inferred from the claim text.