Method for grinding non-conductive material

Abstract

The present invention relates to a method for grinding a material, for example, cement or cement additive. The method according to the present invention includes at least one step of mechanical grinding the said material in a grinding apparatus, wherein grinding apparatus comprises grinding bodies, wherein the method further includes a step of neutralizing a debris-layer formed at the pre-surface layer of the grinding bodies by using in combination, in any order, simultaneously or sequentially, the following operations: a) applying electric potential to the grinding bodies in the said at least one grinding step, and b) applying a surfactant to the said non-conductive material in the said at least one grinding step, wherein the amount of surfactant is from 50% to 100% of the normative amount. The method provides reduction in surfactant consumption, increase of the equipment productivity, reduction of energy consumption and improvement of the wear resistance of the grinding bodies as well as production of cement with the enhanced flow index.

Dependencies are inferred from the claim text.