Cement grinding aid characteristics
A grinding aid is a surfactant that can improve the grinding environment. The common grinding aid is to improve the grinding effect by improving the viscosity of the material in the mill, the dispersion of the particles and the flow state of the slurry. To a large extent, it solves the problems of powder consumption and energy consumption.
The main purpose of the grinding aid is to reduce or terminate the aggregation of the particles, to improve the fineness of the cement and the specific surface area, or to grind to the same fineness, and to increase the productivity when adding the grinding aid. At the same time, the addition of the grinding aid adsorbs the surface of the cement particles, reduces the friction between the particles and the adhesion, so that the cement particles slide, and the fluidity thereof also becomes better, thereby improving the grinding efficiency and the cement performance.
Grinding is a process in which the particles change from coarse to fine under mechanical force, accompanied by changes in the crystal structure and physicochemical properties of the particles. In the early stage of grinding, the material is in the form of a block. Under the action of the grinding medium, the internal structure is destroyed, and the material is broken from large to small;
The destruction of the structure, the surface defects increase, the surface can change, and the powder gradually forms. In the middle of grinding, the material fineness and specific surface area increase rate slow down, the grinding efficiency gradually decreases, and a large number of new surfaces generated by the material powder cause electrostatic charge formation, and agglomeration is likely to occur between the particles. In the later stage of grinding, the crystal particles will undergo crystal recrystallization, and the phenomenon of grinding agglomeration is further aggravated. With the wide application of grinding aids in the cement industry, the two types of grinding aids (phosphate-based grinding aids and alcohol-amine grinding aids) have further studied the two types of grinding aids and the physical properties of cement. The effect of grinding aids on the adaptability of cement and naphthalene based superplasticizer.