Abstract: Coal gangue, desulfurization gypsum and lime were used as main raw materials, the calcium sulphoaluminate-belite cement clinker was prepared by hydrothermal synthesis and low-temperature calcination. The mineral phases of hydrothermal synthesis products, calcined samples and their hydration products were measured by XRD (X-ray diffraction), SEM (scanning electron microscope). The change of hydration heat of cement with time was analyzed by isothermal calorimeter, and the mechanical properties of cement were measured. The results showed that under the premise of hydrothermal synthesis of precursor at 120 ℃, the calcium sulphoaluminate-belite cement clinker can be completely sintered at 1 050 ℃. The early hydration heat release rate of this low-temperature sintered cement is higher, compared with that of one-step calcined cement. When gypsum content is 13wt% in cement, the 1 d and 28 d compressive strength of cement were 30.2 MPa and 57.3 MPa, respectively. The hydration product of cement in 28 d was mainly AFt with long fiber.
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2017, Vol. 31 
