钙硅酸盐矿物湿法碳酸化封存二氧化碳实验研究  

Experimental study on carbon dioxide sequestration by wet carbonation of calcium silicate minerals

作　　者：常承兵 刘生玉[1,2,3] 张雷 杨志超[1,2] 郭建英[1,2] 栗褒 CHANG Chengbing;LIU Shengyu;ZHANG Lei;YANG Zhichao;GUO Jianying;LI Bao(College of Mining Engineering,Taiyuan University of Technology,Taiyuan 030024,China;Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering,Taiyuan 030032,China;Key Laboratory of In situ Property-improving Min-ing of Ministry of Education,Taiyuan University of Technology,Taiyuan 030024 China)

机构地区：[1]太原理工大学矿业工程学院,山西太原030024 [2]山西浙大新材料与化工研究院,山西太原030032 [3]太原理工大学原位改性采矿教育部重点实验室,山西太原030024

出　　处：《无机盐工业》2023年第9期57-65,共9页Inorganic Chemicals Industry

基　　金：山西浙大新材料与化工研究院研发项目(2022SX-TD009);山西省基础研究计划项目(202203021211165)。

摘　　要：钙硅酸盐矿物湿法碳酸化封存CO_(2)是具有发展前景的固碳技术。为了比较不同种类的含钙硅酸盐矿物固碳效果的差异,研究了温度、压力、液固比(mL/g)、粒度及矿物添加剂(NaHCO3和NaCl)对硅灰石和钙长石湿法碳酸化封存CO_(2)效果的影响。结果表明,硅灰石和钙长石的碳酸化产物分别是方解石和文石,热重实验结果显示,方解石的热稳定性强于文石。各实验条件下硅灰石碳酸化转化率均高于钙长石,两种矿物碳酸化转化率随压力增大、粒度减小、NaHCO3和NaCl的加入而增大;获得了硅灰石和钙长石的最大碳酸化转化率分别为83.62%、16.20%,二者差异显著。在温度为120~210℃两种矿物溶解吉布斯自由能(ΔGr)的计算表明,硅灰石溶解过程的吉布斯自由能始终小于钙长石溶解吉布斯自由能,说明硅灰石溶解速率和溶解反应自发进行的程度都大于钙长石,这是影响钙硅酸盐矿物碳酸化反应活性的关键因素。Wet carbonation of calcium silicate minerals for CO_(2) sequestration is a promising carbonsequestration technology.To compare the carbon sequestration effects of different calcium silicate minerals,the effects of temperature,pressure,liquid-solid ratio(mL/g),particle size and mineral additives(NaHCO_(3) and NaCl)on CO_(2) sequestration by wet carbonation of wol-lastonite and anorthite were investigated.The results showed that the carbonation products of wollastonite and anorthite were calcite and aragonite,respectively,and the results of the thermogravimetric experiment indicated that the thermostability of calcite was higher than that of aragonite.The carbonation conversion of wollastonite was higher than that of anorthite under all test conditions,and the carbonation conversion of the two minerals was increased with increasing pressure,decreasing particle size,and the addition of NaHCO_(3) and NaCl.The maximum carbonation conversions of 83.62%and 16.20%were ob-tained for wollastonite and anorthite,respectively,with significant differences.The results of Gibbs free energy of dissolution(ΔGr)showed that,in the range of 120~210℃,theΔGr of wollastonite was always lower than that of anorthite,indicating that the rate of dissolution and the spontaneously occurring extent of dissolution reaction of wollastonite were both greater than that of anorthite.It was a key factor affecting the activity of the carbonation reaction for calcium silicate minerals.

关 键 词：硅灰石 钙长石 湿法碳酸化 封存CO_(2) 固碳技术 

分 类 号：TQ127.1[化学工程—无机化工]