Cement grinding aid is a chemical additive that improves the grinding effect and performance of cement grinding. It can significantly increase the output of cement platform, the strength of cement at various ages, and improve its fluidity. The cement grinding aid can greatly reduce the phenomenon of electrostatic adsorption ball formation formed during the grinding process, and can reduce the re-agglomeration tendency of the ultrafine particles formed during the grinding process. The cement grinding aid can also significantly improve the fluidity of the cement, improve the grinding effect of the mill and the powder selection efficiency of the classifier, thereby reducing the energy consumption of the grinding. The cement produced by the grinding aid has a lower tendency of compaction and coalescence, which is beneficial to the loading and unloading of the cement and can reduce the wall hanging phenomenon of the cement storage.
In cement concrete applications, triisopropanolamine has the following advantages in terms of dispersibility, age enhancement, and application conditions compared with triethanolamine: 1 Dispersibility is better, when used in cement grinding aids, The fundamental principle of the action of the grinding aid is the dispersibility of the two surfactants. The dispersibility of the triisopropanolamine is better due to the spatial stereostructure of the alkyl chain and the hydroxyl group of the triisopropanolamine. Triethanolamine; and dispersibility is an important indicator of cement. In practical applications, triisopropanolamine is superior to triethanolamine in improving the cement, and the fluidity of cement is better than that of triethanolamine.
The slag cement has the advantages of low hydration heat, high late strength, inhibition of alkali aggregate reaction, and resistance to sulfate corrosion, and has been applied in a large number of projects. When producing slag cement, due to the poor grindability of slag compared with clinker, the best active particle size is not achieved when co-grinding, and the single grinding will cause a lot of energy consumption, so it is used in the grinding process. Grinding aids to reduce grinding energy consumption and improve cement performance. Triethanolamine (TEA) and Triisopropanolamine (TIPA) are the main components of common grinding aids. They have strong polarity and can reduce the free energy of cement particles, prevent particle agglomeration and increase particles. The specific surface area also accelerates the hydration rate of clinker minerals. Most of the cement grinding aids are alcohol amines and polyols.
The water reducing agent is used for concrete mixing, which can change the gas content of the concrete, so that the gap ratio inside the concrete is greatly reduced. The effect of water reducer on the fluidity of concrete is usually reflected by the magnitude of the slump. When the proportion of water and cement used in concrete is constant, the degree of collapse of concrete can be greatly improved by adding a precipitant. And through the use of water reducing agents. The concrete setting time can be extended appropriately. However, it is necessary to properly control the amount of water reducing agent. Maintain reasonableness to avoid excessive increase in concrete that will not condense for a long time. By adding the scientific proportion of the water reducing agent, the performance and strength of the overall concrete structure can be improved, and the proportion of water cement in the concrete is reduced.
From the grinding aid industry itself, there are more and more cement companies that recognize the energy-saving and consumption-reducing effects of grinding aids and the quality of grinding aid products. However, curbing the environment of overcapacity has led cement companies to be more careful in the procurement of raw materials. When choosing grinding aids, major groups have adopted the method of “collective procurement, bidding and bidding”, which not only requires quality, but also lowers the price, thus transferring the burden of reducing production costs to their own little brothers. Grinding industry. Due to the “small and porridge” of the grinding aid industry, the competition for vicious low prices has intensified. The consequence of “killing each other” is that it is more difficult to promote the promotion of high-quality grinding aids.
With the development of the cement industry, the effect of cement enterprises on cement grinding aids has also changed. Nowadays, the role of grinding aids in cement production is not only energy saving, but also needs to be enhanced and increased. Performance. Therefore, in the production process of grinding aids, the requirements for production equipment have also undergone earth-shaking changes. Having a complete grinding aid production line does not mean that the grinding aid company is strong. He also needs professional technical talents and researchers, complete laboratory equipment and so on.
In the cement industry production, in order to improve the grinding efficiency, reduce the power consumption of the mill, reduce the fineness of the cement, and improve the quality of the cement, a small amount of material-grinding aid must be added during the grinding process. The grinding aid is composed of one or more surface active substances and other chemical additives. It can reduce the surface energy of the grinding powder during the grinding process, overcome the attraction between the grinding powder, reduce the crushing resistance and prevent Paste the ball. Improve the fluidity of the mill, thereby reducing the power consumption of the mill and improving the grinding efficiency.
Development and application prospects of cement grinding aid products
The main market for the application of cement grinding aids, the development and application of new cement grinding aid products need to be strengthened, and its research focus has shifted to polymer synthesis technology. The synthetic polymer grinding aid combines various functional groups into the main chain structure of the polymer, and the smaller grinding aid effect and the compound grinding aid have a leaping improvement. Because the synthetic polymer grinding aid generally has a low effective amount, the grinding aid has obvious effect, and a suitable dosage range, the fluctuation of the dosage has little effect on the performance of the cement, and the production safety can be better ensured. Polymer grinding aids have low cost, good performance and high comprehensive benefits, and have broad application prospects.
Introduction to cement grinding aids and two principles
Cement grinding aid is a kind of chemical additive to improve the grinding effect and performance of cement grinding. It can significantly increase the output of cement platform, the strength of cement at different ages, and improve its fluidity. The cement grinding aid can greatly reduce the phenomenon of electrostatic adsorption ball formation formed during the grinding process, and can reduce the re-agglomeration tendency of the ultrafine particles formed during the grinding process.
Physical characteristics of triethanolamine and detailed application in different industry sectors
Triethanolamine is a colorless to pale yellow transparent viscous liquid with a slight ammonia odor and a colorless to pale yellow cubic crystal at low temperatures. The color gradually darkens when exposed to the air. Soluble in water, ethanol, acetone, glycerin and ethylene glycol, etc., slightly soluble in benzene, ether and carbon tetrachloride, and almost insoluble in non-polar solvents. Irritating. It is hygroscopic. It can absorb acid gases such as carbon dioxide and hydrogen sulfide. Pure triethanolamine has no effect on steel, niobium, nickel and other materials, but is highly corrosive to copper, aluminum and its alloys. Unlike monoethanolamine and diethanolamine, triethanolamine and iodohydrous acid can form iodide precipitates. Combustible. Low toxicity. Avoid contact with oxidants and acids.