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
{"title":"Reactivity of calcium carbonate prepared from flue gas desulfurization gypsum","authors":"J. Jurišová, V. Danielik, P. Fellner, M. Králik, Tomáš Foltinovič","doi":"10.2478/acs-2019-0003","DOIUrl":null,"url":null,"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.","PeriodicalId":7088,"journal":{"name":"Acta Chimica Slovaca","volume":"12 1","pages":"14 - 21"},"PeriodicalIF":0.9000,"publicationDate":"2019-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"1","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Acta Chimica Slovaca","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.2478/acs-2019-0003","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"CHEMISTRY, MULTIDISCIPLINARY","Score":null,"Total":0}
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.
查看原文
分享 分享
微信好友 朋友圈 QQ好友 复制链接
本刊更多论文
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。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
求助全文
约1分钟内获得全文 去求助
来源期刊
Acta Chimica Slovaca
Acta Chimica Slovaca CHEMISTRY, MULTIDISCIPLINARY-
自引率
12.50%
发文量
11
期刊最新文献
Thermal- and light-induced SCO effect in Fe(II) complexes and coordination polymers Stability of ferrate during long-term storage Colour masterbatches and their use in polylactic acid fibres dyeing DFT studies of camptothecins cytotoxicity IV — active and inactive forms of irinotecan Utilization of Opuntia as an alternative ingredient in value added bread and pasta products
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
0
微信
客服QQ
Book学术公众号 扫码关注我们
反馈
×
意见反馈
请填写您的意见或建议
请填写您的手机或邮箱
已复制链接
已复制链接
快去分享给好友吧!
我知道了
×
扫码分享
扫码分享
Book学术官方微信
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术
文献互助 智能选刊 最新文献 互助须知 联系我们:info@booksci.cn
Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。
Copyright © 2023 Book学术 All rights reserved.
ghs 京公网安备 11010802042870号 京ICP备2023020795号-1