Effect of grinding aid raw materials on cement properties
With the rapid development of China's cement industry, the pressure of energy saving and emission reduction is getting bigger and bigger, cement production enterprises will pay more and more attention to the application of grinding aids, and the application prospect of grinding aids will be very broad. The main raw material used by some foreign companies for grinding aids is de-sugar wood sulfonate.
Calcium acid, carbon black, tricalcium phosphate, amine acetate, ethylene glycol, propylene glycol, etc.; and China mainly uses triethanolamine, triisopropanolamine, ethylene glycol, propylene glycol, diethanolamine and the like. In addition, the commonly used grinding aid component also has lignosulfonate, since 2005,
A combination of triisopropanolamine and triethanolamine and a grinding aid containing a polycarboxylic acid are present.
Effect of Alcohol Amine Grinding Aids on Cement Properties Alcohol amines and polyol grinding aids can improve the fineness of ordinary Portland cement, improve the fluidity of cement, and improve the grading of cement particles, especially the 3~ Fine particle content of 30gm. However, some studies have also found that polyol amine can have good grinding effect on ordinary Portland cement, slag cement, fly ash cement and pozzolan cement, and polyol has good effect on grinding fly ash cement.
However, it has a poor effect on ordinary Portland cement, slag cement and volcanic ash cement. Triethanolamine has a high grinding effect on fine powder. The action of propylene glycol is stable, and the comparative surface area has a more significant effect; ethylene glycol is more favorable for improving the uniformity of the milled material, and has a special effect on the coarse particles in the fine particles. Triethanolamine is usually compounded with other substances to make a cement grinding aid. For example, triethanolamine (0.01%) and wood calcium (0.16%) can greatly improve the fineness of the cement and significantly increase the strength of the cement.
The use of industrial by-products as cement grinding aids has a very broad application prospect. Some foreign scientists use natural bio-glycerol, a by-product of biodiesel manufacturing, to replace common cement grinding aids such as ethylene glycol and hydroxylamine for cement grinding process. Using cement from different regions of Belgium, Greece and Italy, it was found that this bio-glycerol blended with 5% NaCl was more effective than the high-purity grade glycerol. In addition, this bio-glycerol can significantly improve cement. Easy to grind, particle surface morphology and flow properties to improve the transport and unloading capacity of cement. The industrial value of this new bio-glycerol is more economical, cleaner, has a wider range of sources, is easier to process, and has higher commercial value than traditional grinding aids.
The liquid grinding aid formulations widely used in China are mostly single or composite products of chemical raw materials such as alcohols, alcohol amines, acetates, etc., which have high cost and poor performance stability.