Overview of research and development of cement grinding aids

At present, the domestic grinding and grinding agents for research and application are liquid and solid. The formula consists mainly of single or composite products such as amines, polyols and acetates. The basic components are mostly organic surface active substances. Triethanolamine and ethylene glycol are highly polar surfactants and are used as cement grinding aids. However, they are disadvantageous in that they are overpriced and have a shortage of sources. Triisopropanolamine is dispersed in comparison with triethanolamine. There are many advantages in terms of sex, age, application conditions and price. Cement is one of the important building materials. According to the National Bureau of Statistics of China, China's cement production reached 2.09 billion tons in 2011, an increase of 11% year-on-year. The energy consumption of raw materials accounts for 60%-70% of the total energy consumption of the cement industry. Improving the quality of cement, improving the grinding efficiency and reducing the power consumption of grinding are a major concern in the cement industry. Existing methods of adjusting the process and equipment and adding an additive (grinding aid) improve the grinding efficiency and reduce the power consumption. In the prior art, the addition of the grinding aid is widely used in cement grinding because of its short cycle and small investment. 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 is also improved, thereby improving the grinding efficiency and the cement performance. With the wide application of grinding aids in the cement industry, its impact on the suitability of cement and concrete admixtures is also worth investigating. At this stage, cement grinding aids are still commonly used as inorganics, organics or their composites. The research and future development of grinding aids should be from the transition from inorganic and organic small molecules to polymer synthesis. The problem of compounding: the stability of the compounding is not high enough, and the fluctuation of the amount has a great influence on the cement strength. The polymer grinding aid has a low blending amount and low cost. The fluctuation of the blending amount has little effect on the performance of the cement, and the safety is also improved. The overall price ratio is higher than that of the small molecule compounding grinding aid. In our country, the School of Materials Science and Engineering of Nanjing University of Technology has made significant progress in the experimental research of high molecular synthetic grinding aids. With the rapid development of China's economy, the requirements for industrial production are becoming more and more strict, and the development of the grinding aid industry is also more in line with the concept of “resources and environmental friendliness”. Standardize the grinding industry industry access regulations and improve the qualified indicators of the grinding aid industry; production of high-efficiency, low-cost, non-toxic and non-polluting grinding aids is still the subject of research must adhere to; innovation is the main theme of this era. For the research of grinding aids, polymer synthesis is the future trend of the development of grinding aids. Researchers should study the synthesis process of polymer grinding aids more systematically; laboratory research should be in line with industrial production, not just limitations. In the experimental stage of the small mill.