Journal of South China University of Technology(Natural Science) >

2023 , Vol. 51 >Issue 11: 74 - 81

DOI: https://doi.org/10.12141/j.issn.1000-565X.230194

Materials Science & Technology

Effect of Pyrite Tailings Mineralizer on Calcination and Properties of Cement Clinker

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  • 1.School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, Guangdong, China
    2.China Resources Cement (Fengkai) Co. , Ltd. , Zhaoqing 526500, Guangdong, China
    3.Guangzhou Zhujiang Cement Co. , Ltd. , Guangzhou 510460, Guangdong, China
    4.Guangzhou Yuebao Cement Co. , Ltd. , Guangzhou 510800, Guangdong, China
殷素红（1971-），女，博士，教授，主要从事水泥基材料、绿色低碳建筑材料、碱激发胶凝材料和固体废弃物 资源化利用研究。E-mail:imshyin@scut. edu. cn

Received date: 2023-04-06

  Online published: 2023-06-21

Supported by

the Science and Technology Planning Program of Ministry of Housing and Urban-Rural Development(2021-K-064);the Science and Technology Innovation Planning Program of Guangdong Province(2021-K20-512247)

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Abstract

The cement industry is a high energy consuming industry, and the use of mineralizers in the calcination process of cement clinker is an effective energy-saving method. Using solid waste as a mineralizer can also turn waste into treasure and achieve its resource utilization. With pyrite tailings as mineralizer, this study prepared Portland cement clinker with 0, 1.5%, 2.0% and 2.5% SO3 at calcination temperature of 1 350 ℃, 1 400 ℃ and 1 450 ℃. Thermal analysis, X-ray diffraction (XRD), polarizing microscope, and other methods were used to analyze the effects of SO3 addition on the calcination process, mineral composition, petrographic structure, and physical properties of the clinker. The results show that the best effect is achieved when the content of SO3 is 2.0%. Under this proportion, the content of f-CaO in cement clinker decreases from 1.84% to 1.18%, which can significantly improve the burnability of raw meal. The addition of pyrite tailings can reduce the initial and peak temperatures of CaCO3 decomposition in raw meal, and form two transition phases of calcium sulphosilicate (2C2S·CaSO4) and calcium sulphoaluminate (4CaO·3Al2O3·SO3) at low temperature. This reduces the temperature of liquid phase by 35 ℃, promoting the formation and development of clinker minerals, and has a significant mineralization effect. The cement clinker obtained by calcination with pyrite tailings has good performance, and its compressive strength after curing for 3 days and 28 days is 33.1 and 61.8 MPa, respectively.

Key words： pyrite tailing; mineralizer; burnability; mineral composition; microstructure; performance

Cite this article

YIN Suhong, LI Yanmei, DING Weimin, et al. . Effect of Pyrite Tailings Mineralizer on Calcination and Properties of Cement Clinker[J]. Journal of South China University of Technology(Natural Science), 2023 , 51(11) : 74 -81 . DOI: 10.12141/j.issn.1000-565X.230194

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