Patent ID: 9293237
Filing Date: 2016-03-22
CPC Classification: C01P,C09C,D21H,H01B

Claim Text:
1. A method for increasing the pH of an aqueous suspension, containing from 25 to 62 vol. % based on the total volume of the suspension of at least one calcium carbonate-comprising material and having a pH in the range of between 8.5 and 11, comprising adding 2-aminoethanol to the suspension in an amount of from 500 to 15000 mg per liter of the aqueous phase of the suspension, so that the pH of the suspension is increased by at least 0.3 pH units and the conductivity change is not more than 100 μS/cm per pH unit, wherein 2-aminoethanol is added prior to, during or after, a step of grinding the calcium carbonate-comprising material.