Crystal structure of a new high-performance magnesium slag desulfurizer modified by quenching hydration

The original magnesium slag has poor desulfurization activity, so modification treatments are needed to improve its desulfurization activity. In this article, magnesium slag was modified by quenching hydration. The crystal structure and morphology characteristics were obtained by XRD and TEM. And to further understand the relationship between crystal structure and desulfurization performance, desulfurization experiments were carried out by TGA. A theoretical basis for future development of desulfurization methods was provided, which could not only alleviate the disposal problem but also help control SO2 pollution. The results showed that the naturally cooled magnesium slag was mainly composed of gamma-C2S and beta-C2S. The irregular coordination of Ca2+ in beta-C2S was the main reason that the hydration activity of beta-C2S was higher than that of gamma-C2S. With the increase of quenching temperature, the beta-C2S content increased continuously, promoting the formation of C-S-H with developed pore structure. With the increasing hydration temperature, the hydration reaction of beta-C2S could be promoted, and more amorphous C-S-H could be generated. The hydration product C-S-H enhanced the physical adsorption capacity, and the increase of crystal structure defects enhanced the chemical adsorption capacity. At 950 degrees C quenching temperature and 90 degrees C hydration temperature, the desulfurization activity was the highest. Graphic abstract

Automated summary

In this study, magnesium slag was modified by quenching hydration to improve its desulfurization activity. Crystal structure and morphology characteristics were obtained by XRD and TEM, and desulfurization experiments were carried out by TGA to understand the relationship between crystal structure and performance. The results showed that naturally cooled magnesium slag mainly consisted of gamma-C2S and beta-C2S, with beta-C2S exhibiting higher hydration activity than gamma-C2S.