Reactivity of calcium carbonate prepared from flue gas desulfurization gypsum

IF 0.9 Q4 CHEMISTRY, MULTIDISCIPLINARY Acta Chimica Slovaca Pub Date : 2019-04-01 DOI:10.2478/acs-2019-0003
J. Jurišová, V. Danielik, P. Fellner, M. Králik, Tomáš Foltinovič
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引用次数: 1

Abstract

Abstract Reactivity of various calcium carbonate samples for flue gas desulfurization was tested. Two groups of CaCO3 samples were considered; natural limestone containing calcite phase dominantly and samples prepared by the conversion of gypsum with ammonium and carbon dioxide (precipitated CaCO3) containing different amounts of calcite, aragonite and vaterite. Reactivity of precipitated calcium carbonate depends primarily on the particle size, similarly as in case of industrial samples. The initial reaction rate was comparable with the industrial limestones for samples with the average particle size lower than 15 μm. However, the conversion of laboratory samples was significantly higher after 5 min of the reaction. Phase composition of the precipitated calcium carbonate has a minor but noticeable impact on the reactivity. The presence of vaterite slightly increased the reactivity, which is in accordance with its lower compact structure in comparison with calcite and aragonite. Unexpected effect of the increased content of aragonite, which is the most compact phase in comparison with calcite and vaterite, was observed. If calcium carbonate contains up to approximately 30 % of aragonite the reactivity increases, which can be explained by the SEM pictures showing agglomerate composition with relatively high specific surface. At higher contents of aragonite, the reactivity decreases. All the obtained results proved the suitability of precipitated CaCO3 prepared from flue gas desulfurization gypsum to be recycled in the flue gas desulfurization process.
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烟气脱硫石膏制备碳酸钙的反应性
摘要对不同类型碳酸钙烟气脱硫样品的反应性进行了测试。考虑两组CaCO3样品;以方解石相为主的天然石灰石和由石膏与铵和二氧化碳(沉淀CaCO3)转化而成的含有不同量方解石、文石和水晶石的样品。沉淀碳酸钙的反应性主要取决于颗粒大小,类似于工业样品的情况。对于平均粒径小于15 μm的样品,初始反应速率与工业石灰石相当。然而,在反应5分钟后,实验室样品的转化率显著提高。沉淀碳酸钙的物相组成对反应性的影响较小,但影响明显。与方解石和文石相比,钒石的存在使其反应性略有提高,这与其致密结构较低有关。文石是与方解石和水晶石相比最致密的相,其含量的增加产生了意想不到的影响。如果碳酸钙含有大约30%的文石,则反应性增加,这可以通过SEM图片显示具有相对较高比表面的团块组成来解释。文石含量越高,反应性越低。结果表明,烟气脱硫石膏制备的碳酸钙沉淀物在烟气脱硫过程中可循环使用。
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来源期刊
Acta Chimica Slovaca
Acta Chimica Slovaca CHEMISTRY, MULTIDISCIPLINARY-
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12.50%
发文量
11
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