Effects of Glycerol-Waste Antifreeze Based Grinding Aids on Cement Grinding Characteristics

2021 ◽  
Vol 1167 ◽  
pp. 67-75
Author(s):  
Jin Hyok Ri ◽  
Yong Ho Kim ◽  
Yong Su Hwang ◽  
Song Gun Kang ◽  
Ju Hyon Yu

Grinding aids to increase grinding efficiency in cement production are materials that can produce large amounts of high-quality cement in a short time by reducing surface energy by preventing particle agglomeration and improving fluidity. In the paper, a grinding aid using glycerol-waste antifreeze(GAP) is prepared and its effect on the grinding properties of clinker is investigated in contrast to that without the grinding aid. The results are as follows: The angle of repose of the cement powder added with GAP decreases as the grinding time increases (decreases by 3.8° when the grinding time is 60 minutes), indicating that it increases the flowability of the powder. On the contrary, the residual amount of 45µm sieve is also significantly reduced (4.6% decrease) and the specific surface area increases (30.5m2/kg), which results in an increase in the grinding efficiency. In the size range of 3 to 32µm, it increases the particle content, makes the particle size distribution uniform, the 7d and 28d activity index of the powder is improved by 5% and 6%, respectively, and increases the compressive strength of the cement. In addition, it is confirmed that the performance of the TEA grinding aid and the grinding aid are similar, and are very effective in terms of economy.

2017 ◽  
Vol 753 ◽  
pp. 295-299 ◽  
Author(s):  
Shi Hua Hao ◽  
Bing Hua Liu ◽  
Xin Yong Yan

It can increase the cement fineness, improve cement production and improve comprehensive performance of cement significantly by adding grinding aids, and promote the use of grinding aids in reducing the energy consumption of cement production, with the adjustment of national economic growth and the elimination of backward production capacity. But the effect mechanism of the grinding aids is divided, and the grinding effect of the system is still need to be improved. In this paper, the development history of cement grinding aids is introduced, and the grinding aids are summarized systematically from the aspects of the grinding mechanism and present research situation at home and abroad. Study shows that current research only stay on the level of practice, not related to the in-depth research on the theory system and theoretical model, a set of grinding efficiency of composite grinding system and the corresponding scientific theory are need to establish.


2021 ◽  
pp. 51870
Author(s):  
Ebru Dengiz Özcan ◽  
Kenan Çinku ◽  
Şenel Özdamar ◽  
Hasan Ergin ◽  
Şafak Gökhan Özkan

2014 ◽  
Vol 936 ◽  
pp. 1404-1408
Author(s):  
Ji Hui Zhao ◽  
Dong Min Wang ◽  
Xue Guang Wang ◽  
Shu Cong Liao ◽  
Hui Lin

Effects of triethanolamine grinding aids on the angle of repose, fineness, particle morphology and particle size distribution of cement are studied, and the action mechanism of grinding aids is discussed by surface tension and Zeta potential. The results show that the powder fluidity and particle circularity of cement are improved and the particle size and grinding time of cement are effectively reduced by grinding aids. And Grinding aids improve the particles content in the range of 3-32μm particle size by 6.63% and promote destruction of the chemical bonds and lattice distortion of cement mineral during the grinding process. The dispersion grinding mechanism of grinding aids is that they can reduce the surface free energy of powder to prevent fine particles from closing each other and shield or neutralize the particles surface partial charge to prevent facture surface from healing and promoting the cracks to extend easily.


2009 ◽  
Vol 23 (5) ◽  
pp. 1954-1959 ◽  
Author(s):  
M. Katsioti ◽  
P.E. Tsakiridis ◽  
P. Giannatos ◽  
Z. Tsibouki ◽  
J. Marinos

2015 ◽  
Vol 30 (1) ◽  
pp. 134-141 ◽  
Author(s):  
Jihui Zhao ◽  
Dongmin Wang ◽  
Xueguang Wang ◽  
Shucong Liao

Materials ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 7503
Author(s):  
Chang Sun ◽  
Lulu Chen ◽  
Jianzhuang Xiao ◽  
Qiong Liu ◽  
Junqing Zuo

Using recycled powders from solid waste is accepted as an effective strategy to realize the sustainable development of the construction industry. In our study, the cement was substituted by two kinds of recycled powders, i.e., spontaneous combustion gangue powder (SCGP) and recycled concrete powder (RCP), with a certain replacement ratio of 30%. The experimental variables were mainly the type of replacement powder (e.g., SCGP, RCP, and SCGP + RCP) and the grinding time of RCP (e.g., 25 min, 50 min, and 75 min). The fundamental properties, including mechanical properties, long-term properties, and carbon emission, were analyzed for all the mortar mixtures. Experimental results indicate that incorporation of RCP contributes to enhancing the toughness and dry shrinkage resistance of eco-efficient mortar, while SCGP positively affects the compressive strength and chloride resistance. The grinding process improves the activity of RCP to a certain extent, while a long grinding time leads to fusion and aggregation between powders. Investigation on CO2 emission demonstrates that carbon emission from cement production accounts for the largest proportion, 80~95%, in the total emission from mortar production. Combined with the AHP model, eco-efficient mortar containing 15% RCP ground for 50 min and 15% SCGP displays optimal fundamental properties.


Author(s):  
I. Borisov ◽  
A. Stronin ◽  
Viktor Klassen

At present, cement is the most common binding material widely used in construction work. Recently, high-quality cement has become increasingly used in comparison with ordinary cement. This is due to the fact that the use of high grade cement requires a smaller amount for the preparation of mortar, it is economically viable, because in today's market, cement has a relatively high cost. The high price is a consequence of the high energy costs associated with the production of cement. This implies the need to find ways to intensify the technological process of cement production. The authors of this article continue to conduct scientific research, which consists in substantiating the rationality of recovery a double-ball media in the second chamber mill. This paper compares the efficiency of the second chamber of the mill when using a double-ball grinding media in comparison with several variants of the traditional media and thoroughly proves the rationality of replacing the traditional types of grinding media with a double-ball. Based on the results of previous studies, several of the most characteristic assortments of double-ball media are selected, which made it possible to obtain a finished product with a high fineness of grinding in a relatively short grinding time. The first variant of the traditional loading is characterized by the fact that the second chamber of the mill is loaded with an assortment of grinding bodies consisting only of balls of the same diameter; the second variant differs from the first in that the grinding balls are replaced with cylpebs. Meanwhile, the assortment of grinding media for the first chamber is the same


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