Grinding aids area unit organic compounds that are extra to the mill throughout cement grinding. Their main purpose is to scale back the energy needed to grind the clinker into a given fineness.

A ball mill usually loses its grinding potency remarkably at fine grinding. this can be as a result of fine particles from ground materials agglomerate and cling to the mill liners or grinding media as coating, reducing the impulsive force of the mill.  Additionally, the collective particles area unit mixed into the coarse powder within the apparatus and recirculated through the mill.

A grinding aid prevents this agglomeration to improves grinding potency. the aid is mostly extra to the clinker at a hard and fast rate from zero.01% to 0.03% before coming into to a finishing mill. As a result, the grinding improves by four- dimensional to six per zero.01% addition of aid. the aid additionally improved the dispersibility and fluid ability of cement (powder) and weathering is delayed.