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Synthesis of needle-like aragonite from limestone in the presence of magnesium chloride
Authors:Zeshan Hu  Minghao Shao  Qiang Cai  Sheguang Ding  Chenghua Zhong  Xiaopin Wei  Yulin Deng
Affiliation:1. Engineering Research Centre for Waste Oil Recovery Technology and Equipment, Ministry of Education, Chongqing Technology and Business University, Xuefu Avenue, Nan’an District, Chongqing 400067, PR China;2. School of Chemical and Biomolecular Engineering, IPST@GT, Georgia Institute of Technology, 500 10th Street N.W., Atlanta, GA 30332-0620, USA;1. Geosciences Environnement Toulouse (GET), Observatoire Midi-Pyrénées, Université de Toulouse, CNRS, IRD, UPS, 14 Avenue Edouard Belin, 31400 Toulouse, France;2. Institute of Applied Geosciences, Graz University of Technology, Rechbauerstrasse 12, 8010 Graz, Austria;1. CIRIMAT, University of Toulouse, CNRS, INPT, UPS, ENSIACET, 4 allée Emile Monso, CS 44362, 31030 Toulouse cedex 4, France;2. University of Patras, Department of Chemical Engineering and FORTH-ICEHT, Patras, Greece;1. Department of Chemical, Environmental and Materials Engineering, Higher Polytechnic School of Linares, University of Jaén, Campus Científico y Tecnológico, Cinturón Sur s/n, 23700 Linares, Jaén, Spain;2. Laboratoire de Technologie des Materiaux et de Génie des Procédés (LTMGP), Faculté des Sciences Exactes, Université A. Mira-Béjaïa, Terga Ouzemmour, 06000 Béjaïa, Algeria;3. Department of Graphical Engineering, Design and Projects, Higher Polytechnic School of Linares, University of Jaén, Campus Científico y Tecnológico, Cinturón Sur s/n, 23700 Linares, Jaén, Spain;4. Department of Chemical, Environmental and Materials Engineering, Higher Polytechnic School of Jaén, University of Jaen, Campus Las Lagunillas s/n, 23071 Jaén, Spain;5. Institut of Materials Science of Sevilla, Mix Center CSIC (Spanish National Research Council)-University of Sevilla, cicCartuja Building, c/Américo Vespucio 49, 41092 Isla de La Cartuja, Sevilla, Spain;1. Faculty of Environmental and Biological Engineering, Guangdong University of Petrochemical Technology, Maoming, Guangdong 525000, China;2. School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan, Hubei 430070, China;3. Doctorado Institucional de Ingeniería y Ciencia de Materiales, Universidad Autonoma de San Luis Potosi, Av. Sierra Leona 530, San Luis Potosi C.P. 78210, Mexico;4. Hubei Key Laboratory of Mineral Resources Processing and Environment, Luoshi Road 122, Wuhan, Hubei 430070, China;5. The Key Lab of Marine Environmental Science and Ecology of Ministry of Education, Ocean University of China, Qingdao 266100, China;1. CAS Key Laboratory of Crust-Mantle Materials and Environments, School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, PR China;2. School of Chemistry and Materials Science, University of Science and Technology of China, Hefei 230026, PR China;3. Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China, Hefei 230026, PR China
Abstract:Needle-like aragonite was synthesized with a reversible solution reaction from limestone without calcinations. Scan Electron Microscope (SEM) and X-ray Diffraction (XRD) were used to characterize the morphology and the crystal structure of aragonite. The synthesis of aragonite whisker involves two steps. At first GCC (Ground Calcium Carbonate) was dissolved in an aqueous solution of magnesium chloride with reflux and air flush. Then CO2 was bubbled into the suspension at a low temperature to produce aragonite whisker. An in-house designed reactor and acid–base titration analysis were used to measure the remaining GCC content in the reaction mixture. A kinetics equation of GCC dissolution was developed, which showed a first-order kinetic feature to magnesium chloride concentration. A reaction rate constant of 0.04234 h?1 was obtained. The dissolution rate of GCC in magnesium chloride is much higher than that in the magnesium sulfate solution. Some aragonite whiskers with a length of ca. 20 μm and an aspect ratio of 8–12 can be synthesized.
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