Process for the control of pitch
AssigneeOmya Development AG
InventorsPatrick A. C. Gane, Joachim Schölkopf, Daniel Gantenbein
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Abstract
The present invention relates to a process for the control of pitch in an aqueous medium by adding surface-reacted natural calcium carbonate or an aqueous suspension comprising surface-reacted calcium carbonate and having a pH greater than 6.0 measured at 20° C., to the medium, wherein the surface-reacted calcium carbonate is a reaction product of natural calcium carbonate with carbon dioxide and one or more acids, the use of the surface-reacted natural calcium carbonate for pitch control, as well as to a combination of a surface-reacted natural calcium carbonate and talc for pitch control, and the resulting composites.
Claims38
A composition comprising surface-reacted natural calcium carbonate and pitch adsorbed thereon from an aqueous medium, wherein the composition is obtained by (a) contacting an aqueous medium containing pitch with (i) surface-reacted natural calcium carbonate or (ii) an aqueous suspension comprising surface-reacted natural calcium carbonate having a pH of greater than 6.0 measured at 20° C., wherein the surface-reacted natural calcium carbonate is a reaction product of natural calcium carbonate with carbon dioxide and one or more acids, and wherein the carbon dioxide is formed in situ by the acid treatment and/or is supplied from an external source;
- and (b) separating the composition from the aqueous medium.
Dependencies are inferred from the claim text.