【摘 要】
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Single-phaseα-CaSO4·0.5H2O whiskers were directly synthesized from waste Ca(NO3)2 solution using a hydro-thermal method, and HNO3 was synchronously regenerate
【机 构】
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State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 1
论文部分内容阅读
Single-phaseα-CaSO4·0.5H2O whiskers were directly synthesized from waste Ca(NO3)2 solution using a hydro-thermal method, and HNO3 was synchronously regenerated. The effects of reaction temperature and Ca2+con-centration 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 ofα-CaSO4·0.5H2O was plot-ted within the range of 5–35 g·L?1 Ca2+and 115 ℃–150 ℃. In addition, the conditions of the direct synthesis ofα-CaSO4·0.5H2O were determined. Well-crystallized, single-phaseα-CaSO4·0.5H2O whiskers with high aspect ratios (length, 1785μm;diameter, 10.63μm;aspect ratio, 168) and HNO3 (70.25 g·L?1) were obtained at the op-timal conditions of 25 g·L?1 Ca2+and 125 ℃.
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