Direct synthesis of single-phase α-CaSO4·0.5H2O whiskers from waste nitrate solution  

作　　者：Shuang Shao Baozhong Ma Yongqiang Chen Wenjuan Zhang Bao Liu Peng Xing Chengyan Wang 

机构地区：[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

出　　处：《Chinese Journal of Chemical Engineering》2020年第6期1752-1754,共3页中国化学工程学报（英文版）

基　　金：supported by the Beijing Natural Science Foundation of China(2182040);the National Natural Science Foundation of China(51674026,U1802253);the Fundamental Research Funds for the Central Universities(FRF-TT-19-001);the China Scholarship Council(201906465004)。

摘　　要：Single-phaseα-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 Ca^2+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 ofα-CaSO4·0.5H2O was plotted within the range of 5–35 g·L^-1 Ca^2+and 115°C–150°C.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 optimal conditions of 25 g·L^-1 Ca^2+and 125°C.

关 键 词：α-CaSO4·0.5H2O whiskers Direct synthesis Formation diagram Waste Ca(NO3)2 solution HNO3 regeneration 

分 类 号：O614.231[理学—无机化学]