Incorporation and solidification mechanism of manganese doped cement clinker

Nan Yang; Aihong Li; Qing Liu; Yanshuai Cui; Zhaojia Wang; Yukun Gao; Jianping Guo

doi:10.3389/fchem.2023.1165402

Incorporation and solidification mechanism of manganese doped cement clinker

Front Chem. 2023 Apr 4:11:1165402. doi: 10.3389/fchem.2023.1165402. eCollection 2023.

Authors

Nan Yang¹, Aihong Li¹, Qing Liu¹, Yanshuai Cui¹, Zhaojia Wang¹, Yukun Gao², Jianping Guo¹

Affiliations

¹ State Key Laboratory of Solid Waste Reuse for Building Materials, Beijing Building Materials Academy of Science Research, Beijing, China.
² Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology of Ministry of Education, School of Chemistry, Beihang University, Beijing, China.

Abstract

Using municipal and industrial solid waste as a substitute raw material and fuel in cement rotary kiln co-processing is considered an economic and environmentally friendly alternative to the use of traditional fuels. However, the presence of heavy metals in solid waste is a growing concern in the cement rotary kiln co-processing technique. The solidification mechanism of heavy metals in cement clinker is directly related to their stabilization. Cement clinkers doped with manganese oxide (MnO₂: 0.0%-5.0% wt%) were prepared in a laboratory to investigate the impacts of extrinsic Mn on cement clinker calcination. The insignificant changes in X-ray diffractometer patterns indicated that the fixed Mn had little influence on the mineral lattice structure. Raman spectra and X-ray photoelectron spectroscopy revealed the transformation of the silicate phase when the Mn dose was increased. Moreover, the satisfactory solidification ratio confirmed the incorporation of Mn in the cement clinker. These results provided evidence of the influence rule of Mn in the cement clinker calcination process. Furthermore, Raman spectroscopy showed great potential for the qualitative and semi-quantitative analysis of the cementitious materials derived from cement rotary kiln co-processing. These results will be important for the further development of green cement manufacturing technology.

Keywords: Raman; XPS; cement kiln co-processing; heavy metals; immobilization.

Grants and funding

The authors declare that this study received funding from Beijing Building Materials Group (BBMG). The funder was not involved in the study design, collection, analysis, interpretation of data, the writing of this article, or the decision to submit it for publication.