Preparation and color rendering mechanism of silica-manganese slag-based sintered blue bricks
Wang J. Liu B. An C. Zhang X. Zhang D. Zhang S.
October 2025Elsevier Ltd
Ceramics International
2025#51Issue 2544748 - 44758 pp.
Sintered bricks with a gray-blue appearance were prepared through solid-state diffusion sintering using magnesium smelting slag (MS) and silicomanganese alloy slag (SMS) as raw materials. The sintered samples exhibit excellent physical properties: water absorption was reduced to 1.48 %, compressive strength increased to 42.35 MPa, and bulk density reached 2.41 g cm−3. The sintered samples were confirmed to have good environmental suitability and safety through toxicity leaching tests as well as freeze-thaw cycle tests. XRD and XPS analysis revealed that the residual manganese in SMS enters the akermanite lattice via ionic substitution, forming a Ca2(Mg1-xMnx)Si2O7+δsolid solution. As the Mn content (x) increases from 0.0 to 1.0, the color of the sintered bricks evolves gradually, with the blue hue deepening and the overall color darkening. This color change is attributed to electron transitions in the d-orbital of Mn3+within the Mn3+O5 complex coordination environment in the Ca2(Mg1-xMnx)Si2O7+δstructure. The process is characterized by high solid waste utilization, low energy consumption, and environmental friendliness. By utilizing residual transition metal elements from industrial solid waste, this method achieves both the controllable adjustment of the materials color and excellent performance.
Blue bricks , Color rendering mechanism , Resource utilization , Silicon manganese alloy slag
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Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing, 100083, China
School of Physics and Materials Science, Nanchang University, Jiangxi, Nanchang, 330031, China
Xinjiang Research Institute for Nonferrous Metals Co., Ltd., Urumqi, 830009, China
Department of Civil and Environmental Engineering, School of Engineering and Digital Sciences, Nazarbayev University, Astana, Kazakhstan
Institute for Advanced Materials and Technology
School of Physics and Materials Science
Xinjiang Research Institute for Nonferrous Metals Co.
Department of Civil and Environmental Engineering
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