Effect of titanium slag on the properties of magnesium phosphate cement

Abstract

Titanium slag is industrial solid waste, and its efficient utilization has important practical significance for reducing the environmental impact and promoting resource utilization. In the magnesium phosphate cement (MPC) application process, its high hydration heat and setting rate are always difficult problems to solve, adding fillers is the main method to improve the performance of MPC. Therefore, this paper mainly studies the influence of titanium slag on the working performance, hydration temperature and mechanical properties of MPC. X-ray diffraction (XRD), thermogravimetric analysis (TG), scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) were also used to analyze the hydration products and microscopic morphology of the samples. The results show that titanium slag can effectively improve the working performance of the MPC slurry and reduce the heat of hydration. When the content of titanium slag is 50%, the fluidity of MPC samples with M/P of 2:1 and 3:1 is significantly higher than that of the original group, the setting time is increased by 115.4% and 100%, respectively, and the hydration temperature is reduced by 21.9% and 17%, respectively. The compressive strength of MPC decreases with increasing titanium slag content, and when M/P is 3:1, the early strength is increased. XRD and TG analysis showed that adding titanium slag reduced K-struvite formation in the MPC sample. SEM and EDS analysis indicate that large amounts of titanium slag will change the shape and size of the hydrated product, and the structure will become loose. When the titanium slag content is 30%, the sample with M/P = 3:1 has a dense structure and high strength. A certain amount of titanium slag is beneficial for prolonging the setting time of MPC, and a lower hydration exotherm and higher fluidity will also increase with titanium slag addition.