Research on the Preparation and Properties of High Belite Sulphoaluminate Cement (HBSAC) Based on Various Industrial Solid Wastes

Abstract

In this study, a variety of industrial solid wastes, including petroleum coke desulfurization slag, fly ash and carbide slag with natural resource bauxite, were used as raw materials to prepare high belite suphoaluminate cement, which contains a certain CaSO4 content without adding natural gypsum to the clinker. The sintering temperature, mineral composition, and the physical and mechanical properties of the cement clinkers were investigated. The techniques adopted included a comprehensive thermal analysis (DSC-TG), X-ray diffraction (XRD), X-ray fluorescence (XRF) and scanning electron microscopy (SEM). The results revealed that it is completely feasible to prepare high belite sulphoaluminate cement with the various industrial solid wastes mentioned above and the utilization rate of the solid wastes is up to 80%. The sintering temperature ranges from 1225 °C to 1350 °C, and the optimal sintering temperature is approximately 1300 °C. The clinkers prepared at 1300 °C set and harden quickly and have a slightly higher water requirement of normal consistency. The mechanical strength is greatly affected by the CaSO4 and 3CaO·3Al2O3·CaSO4 contents and the most reasonable CaSO4 content is 15%.

New Strategy toward Household Coal Combustion by Remarkably Reducing SO2 Emission

“…Meanwhile, at 1200 °C, the sulfur-fixation efficiency of adding Al 2 O 3 in clean coke continued to drop off quick with the increasing temperature. The phenomenon can be interpreted to start generating resistance to the high-temperature phase calcium sulfoaluminate (3CaO·3Al 2 O 3 ·CaSO 4 ) as temperature increased from 1100 to 1325 °C on the basis of the conventional sulfur-fixation product (CaSO 4 ) . However, when the combustion temperature is above 1200 °C, the sulfur-fixation rate always descends rapidly first and then increases slowly from 1200 to 1300 °C.…”

Preparation and Physico-Chemical Performance Optimization of Sintering-Free Lightweight Aggregates with High Proportions of Red Mud

“…By controlling the alkalinity coefficient and adjusting the ratio of raw materials, as shown in Table 3 , the solid waste-based sulphoaluminate cement clinker was obtained after calcining at 1250 °C, and heating preservation time for 45 min [ 28 ]. Finally, 8% FGD gypsum was added to obtain the solid waste-based sulphoaluminate cement [ 29 ], after grinding and mixing, the solid waste-based sulphoaluminate cement was obtained. The compressive strength of solid waste-based sulphoaluminate cement prepared by different ratios were tested, respectively.…”

Study on the Influence of Nanosilica Sol on the Hydration Process of Different Kinds of Cement and Mortar Properties

“…The hydration rate of anhydrous calcium sulphoaluminate (C 4 A 3 S) is shown in Equation ( 4), and its hydration rate is extremely fast, which can make the 1 d strength of high-belite sulphoaluminate cement reach more than 85% of the final strength [31,34]. As can be seen from Figure 5, the content of hydrated calcium sulphoaluminate increases with the increase in nanosilica content at the same cement age, which also indicates that nanosilica can further promote the hydration process of anhydrous calcium sulphoaluminate (C 4 A 3 S).…”

“…High-belite sulphoaluminate cement is a kind of green cement [30,31] that consumes less energy and emits less CO 2 in the preparation process. At the same time, properties such as quick setting and hardening, low hydration heat and excellent permeability resistance make high-belite sulphoaluminate cement widely useful in many fields, such as road rapid repair.…”