Direct synthesis of single-phase α-CaSO4·0.5H2O whiskers from waste nitrate solution |
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| Authors: | Shuang Shao Baozhong Ma Yongqiang Chen Wenjuan Zhang Bao Liu Peng Xing Chengyan Wang |
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| Affiliation: | 1.State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China;2.School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China;3.Department of Materials Engineering, The University of British Columbia, Vancouver, BC V6T 1Z4, Canada |
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| Abstract: | Single-phase α-CaSO4·0.5H2O whiskers were directly synthesized from waste Ca(NO3)2 solution using a hydrothermal method, and HNO3 was synchronously regenerated. The effects of reaction temperature and Ca2+ concentration on the phase composition and morphology of products were determined by X-ray diffraction and optical microscopy. On the basis of the experimental results, the formation diagram of α-CaSO4·0.5H2O was plotted within the range of 5-35 g·L-1 Ca2+ and 115℃-150℃. In addition, the conditions of the direct synthesis of α-CaSO4·0.5H2O were determined. Well-crystallized, single-phase α-CaSO4·0.5H2O whiskers with high aspect ratios (length, 1785 μm; diameter, 10.63 μm; aspect ratio, 168) and HNO3 (70.25 g·L-1) were obtained at the optimal conditions of 25 g·L-1 Ca2+ and 125℃. |
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| Keywords: | α-CaSO4·0 5H2O whiskers Direct synthesis Formation diagram Waste Ca(NO3)2 solution HNO3 regeneration |
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