磷石膏矿化固定CO_2制备高纯高白CaCO_3

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英文篇名：Preparation of High-purity and High-white CaCO_3 by Phosphogypsum Mineralization for CO_2 Capture 作者：赵红涛 ; 王树民 ; 刘志江 ; 张曼 英文作者：ZHAO Hongtao;WANG Shumin;LIU Zhijiang;ZHANG Man;National Energy Investment Group Co., Ltd.;School of Environment, Tsinghua University;School of Environmental Engineering, North China Institute of Science and Technology; 关键词：磷石膏 ; CO_2 ; 碳酸化 ; 纯度 ; 白度 英文关键词：phosphogypsum;;CO_2;;carbonation;;purity;;whiteness 中文刊名：CLDB 英文刊名：Materials Reports 机构：国家能源投资集团有限责任公司;清华大学环境学院;华北科技学院环境工程学院; 出版日期：2019-08-05 出版单位：材料导报 年：2019 期：v.33 基金：国家重点研发计划项目(2017YFB0603300);; 中央高校基本科研业务费资助项目(3142018011)~~ 语种：中文; 页：CLDB201918007 页数：5 CN：18 ISSN：50-1078/TB 分类号：32-35+43

摘要

为提升固废磷石膏矿化固定CO_2反应转化率、反应速率以及产品碳酸钙的纯度和白度,本研究首先利用磷石膏高效除杂技术获得净化石膏,再在加压条件下矿化固定CO_2。采用XRF、XRD、SEM及白度分析仪等对净化石膏和产品碳酸钙以及碳酸化反应的转化率、反应速率进行比较分析。结果表明,通过高效除杂,磷石膏中几乎所有杂质都有效脱除。由于大幅消除了杂质对磷石膏解离以及碳酸化反应的不利影响,在净化石膏矿化固定CO_2时,碳酸化反应的转化率从97.5%增加到99.5%,反应速率小幅增加,所得碳酸钙产品的纯度从86.5%增加到99.1%,白度从47.8%大幅增加到91.7%,且碳酸钙的晶型由方解石型转化为文石型。同时,本研究所得碳酸钙产品的纯度和白度显著增加,使其相应的附加值更高、用途更广,从而显著提升磷石膏矿化捕集CO_2技术的经济性,为CO_2的捕集并联产高品质碳酸盐产品,以及磷石膏的高效资源化提供新思路。
        In order to increase the conversion ratio, reaction rate of phosphogypsum(PG) mineral carbonation for CO_2 capture and the purity and whiteness of CaCO_3 product, firstly, the purified gypsum was prepared through PG efficient impurity removal technology and then to fix CO_2 under pressurized condition. The characterization of purified gypsum, CaCO_3 product, the carbonation conversion ratio and the reaction rate were comparatively analyzed by XRF, XRD, SEM and whiteness analyzer. The results showed that almost all impurities in PG were effectively removed through this efficient purification technology. Due to the substantial elimination of the effects of adverse impurities on the dissociation of phosphogypsum and carbonation reaction, not only the conversion ratio increased from 97.5% to 99.5% and the reaction rate also increased slightly, but also the purity of CaCO_3 product increased from 86.5% to 99.1%, the whiteness increased sharply from 47.8% to 91.7%, and CaCO_3 crystalline form translated from calcite into aragonite. The significant increase of purity and whiteness of CaCO_3 product, correspon-dingly higher added value and wider application, will greatly enhance the economy and industrial application of PG mineral carbonation for CO_2 capture, eventually providing a new idea for carbon dioxide capture and co-production of high-quality carbonate products and efficient recycling of phosphogypsum.

引文

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