Grinding aids, additives to improve grinding efficiency.

Generally, it is a surface active material, which can reduce the specific surface energy and "wedge" particle cracks.

In the process of fine grinding, the particles are refined gradually, the specific surface area is increased, the surface is charged because of the broken bonds, and the particles adsorb each other and agglomerate, which reduces the grinding efficiency. Adding a small amount of grinding aids can prevent particle agglomeration and improve material fluidity, thus improving ball milling efficiency and shortening grinding time.

For example, proper oleic acid is added to dry grinding of alumina and a small amount of aluminium chloride is added to wet grinding. A certain amount of sulfite pulp waste liquor is added when grinding ordinary ceramics.
There are many kinds of grinding aids, which vary with the grinding materials. Polymer compounds such as polyols, polyglycolamine, triethanolamine, triisopropanolamine, ethylene glycol and diethylene glycol are the preferred materials.

For cement grinding aids, it can be defined as one or more surface active substances which can improve the grindability of materials in cement processing and increase the grinding efficiency by less than 0.5%.
Effect:
1. Under the condition of the cement mill unchanged, the dispersion of the material in the mill can be changed, the phenomenon of electrostatic adsorption and ball pasting of cement fine particles can be effectively eliminated, and the gradation of cement particles can be optimized.
2. Under the condition of maintaining the same cement strength grade, using the same cement clinker and mixtures and adjusting their proportions properly, the cement clinker can be reduced by 6-10% after adding cement grinding aids, and the total amount of mixtures can be increased by 6-10%.
3. Maintaining the original mill output unchanged, increasing cement grinding fineness and specific surface area can increase cement strength by 20% in 3 days and 10% in 28 days, or maintaining existing cement grinding fineness and specific surface area can increase cement mill output by more than 10%.
Cement grinding aids can also bring direct economic benefits to cement enterprises: power consumption per unit of production, consumption of abrasives, consumption of mill lining, corresponding reduction of maintenance costs, increase of productivity, expansion of enterprise production scale and reduction of cost. At the same time, the use of cement grinding aids can improve the fluidity of cement, improve the efficiency of flour separator, reduce the phenomenon of cement storage, and the loading and unloading time and cost of cement will be reduced accordingly.