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Influence of disodium hydrogen phosphate dodecahydrate on hydrothermal formation of hemihydrate calcium sulfate whiskers
Institution:1. College of Chemical Engineering, Kunming University of Science and Technology, Kunming 650500, China;2. Department of Chemical Engineering, Tsinghua University, Beijing 100084, China;1. Qingdao Industrial Energy Storage Technology Institute, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, No.189 Songling Road, Laoshan District, Shandong, Qingdao 266101, PR China;2. University of Chinese Academy of Sciences, 19A Yuquanlu Road, Beijing 100049, PR China;3. Division of Reaction Engineering, Department of Chemical Engineering, Tsinghua University, Beijing 100084, PR China;4. Department of Applied Chemistry, Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, 1-1 Minami-Ohsawa, Hachioji, Tokyo 192-0397, Japan;1. Institute of Microelectronics, Tsinghua University, Beijing 100084, China;2. Department of Chemical Engineering, Tsinghua University, Beijing, 00084, China;3. Institute of Functional Nano and Soft Materials, Soochow University, Suzhou 215123, China;1. CAS Key Laboratory of Biobased Materials, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, China;2. Department of Chemical Engineering, Tsinghua University, Beijing 100084, China;3. Department of Applied Chemistry, Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, 1-1 Minami-Ohsawa, Hachioji, Tokyo 192-0397, Japan
Abstract:The influence of Na2HPO4·12H2O on the hydrothermal formation of hemihydrate calcium sulfate (CaSO4·0.5H2O) whiskers from dihydrate calcium sulfate (CaSO4·2H2O) at 135 °C was investigated. Experimental results indicate that the addition of phosphorus accelerates the hydrothermal conversion of CaSO4·2H2O to CaSO4·0.5H2O via the formation of Ca3(PO4)2 and produces CaSO4·0.5H2O whiskers with thinner diameters and shorter lengths. Compared with the blank experiment without Na2HPO4·12H2O, the existence of minor amounts (8.65 × 10?4–4.36 × 10?3 mol/L) of Na2HPO4·12H2O led to a decrease in the diameter of CaSO4·0.5H2O whiskers from 1.0–10.0 to 0.5–2.0 μm and lengths from 70–300 to 50–200 μm.
Keywords:Calcium sulfate whiskers  Morphology control  Phosphorus  Hydrothermal technology
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