ISSN 0862-5468 (Print), ISSN 1804-5847 (online) 

Ceramics-Silikáty 68, (2) 195 - 204 (2024)

Zhang Xiang 1, Lu Xiaolei 1, Feng Junrui 2, Zheng Guofa 1, Yang Qingchun 1, Peng Du 1, Zhu Jiang 1, Cheng Xin 1
1 Shandong Provincial Key Laboratory of Preparation and Measurement of Building Materials, University of Jinan, Jinan, China
2 Shandong Shanshui Cement Co., Ltd., Linyi, China

Keywords: Red mud, Calcium ferroaluminate clinker, Calcium sulphate, Temperatures, Mechanical properties

The high alkali content in red mud is one of the main issues faced in preparing the cement clinker. In this paper, a calcium ferroaluminate (CFA) cement clinker with and without CaSO₄(C$) was prepared using over 24.2 wt.% of red mud, The effects of C$ on the formation of the CSA clinker minerals at different calcination temperatures and the mechanical properties of the cement clinker were investigated. The results indicate that Na₂O from the red mud obviously reduced the content of the dominant phase C₄A₃$ in the CFA clinker. In contrast, the C₄A₃$ content in the clinker specimens increases with the increasing C$ content in the raw mixture. The optimal calcination temperature for the CFA cement clinker with C$ is 1175 °C, whose compressive strength reaches 40.0 MPa and 57.9 MPa at 1 d and 28 d, respectively. In addition, Na₂O firstly reacts with sulfate to form Na₂SO₄, and secondly incorporates the C₄A₃$ phase to form a solid solution in the CFA clinkers. The finding is important to improve the application of red mud in the preparation of cement clinkers.

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doi: 10.13168/cs.2024.0019
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