Abstract
The effects of N2 pressure and particle size on DTA curves of CaSO41.1/2 H20 have been studied by using high pressure DTA technique. The measurements were -carried out on various CaSO41/2 H20 (5 species), a-CaSO4.1/2 H20 and p-CaSO4112 I=1, 0 with different particle size (from ca.1 urn to ca.100 um). For high pressure DTA curves, the peak temperature varied with the type of hernihydrate, the particle size and N2 pressure. Under N2 pressure, the endothermic peak temperatures due to dehydration of the series of p-CaSO4112 H20 were in lower temperature range than that of a-CaSO4112 H20. In the series of p-CaSO41/2 H20, the endothermic peak temperature shift to the lower temperature with decreasing the particle size. For the fine particle group, these peaks were separated into two peaks. It was assumed that its lower endothermic peak was caused by the rearrangment in 9-CaSO4.1/2 1-120 crystal by releasing H20. Each Ca S O4.1/2 H20 was characterized by the endothermic peak temperatures due to their dehydration under N2 pressure of 1.5 MPa.
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