The beneficial effects of scientific and rational use of cement grinding aids on cement production: (1) Improve grinding efficiency, increase bench production, and reduce power consumption. This is the most direct effect of using cement grinding aids. Since the grinding aid disperses the particles of the grinding material and increases the fluidity thereof, the grinding medium in the grinding machine strengthens the pulverizing action of the material, thereby improving the grinding efficiency and increasing the production time of the cement. At the same time, the relative power consumption is reduced. (2) The amount of clinker is reduced, and the amount of mixed materials is increased. Since the grinding aid can increase the fine particle content and a part of the grinding aid material itself to promote the hydration of the cement, the cement strength performance can be improved.
Conclusion: (1) Triethanolamine, triisopropanolamine and diethanol monoisopropanolamine are all good cement grinding aids, which have good grinding effect. (2) Triethanolamine has excellent early strength improvement, but can not even weaken the late strength of cement; triisopropanolamine can not promote the early strength of cement, but can improve the characteristics of late strength; diethanol monoisopropanolamine It has the advantages of both, and has obvious improvement on early strength and late strength. (3) Due to the prevalence of chloride salt early strength agents and triisopropanolamine compared with triethanolamine, there are many advantages in terms of dispersibility, age enhancement, application conditions and relative costs, so the application is gradually increasing. , an increasingly widespread replacement of triethanolamine.
Since the 1930s, cement grinding aids have been used in the cement industry. The earliest patents of the 1930s tested and used powdered mixtures of mineral oil, animal oil and petroleum cracking residues to improve the water resistance of cement products and improve the high early strength and processability of cement. It is combined with hydrochloric acid or calcium chloride, lime-type calcium-containing material and an inert adsorbent mineral material as a carrier. These admixtures greatly improve the water resistance of the cement series and improve its processability.
The development status of DEIPA in China and its future development prospects and application in cement grinding aids
China's DEIPA is mainly used in cement grinding aids. The dosage is 0.5 to 10,000 parts per million of cement. It can be combined with polyol, triethanolamine and harmless inorganic salts. It can be designed as a high-volume product. It can be used to enhance multi-mixed materials. It can also be designed as a low-volume product for high-grade cement to achieve a comprehensive effect of enhanced production