石灰石干法制备高性能氢氧化钙的工艺及应用研究  

Study on process and application of high⁃performance calcium hydroxide prepared by dry digestion from limestone

作　　者：刘越 郑强 邢佳斌 邢润 马亚丽 贾松岩 李雪 LIU Yue;ZHENG Qiang;XING Jiabin;XING Run;MA Yali;JIA Songyan;LI Xue(College of Chemical Engineering,Shenyang University of Chemical Technology,Shenyang 110142,China;Engineering Research Center of Inorganic Functional Materials of Magnesium and Calcium Liaoning Province,Shenyang 110142,China;Key Laboratory of Chemical Engineering,Shenyang 110142,China)

机构地区：[1]沈阳化工大学化学工程学院,辽宁沈阳110142 [2]辽宁省镁钙无机功能材料工程研究中心,辽宁沈阳110142 [3]辽宁省化工应用技术重点实验室,辽宁沈阳110142

出　　处：《无机盐工业》2023年第10期42-49,85,共9页Inorganic Chemicals Industry

基　　金：2020—2022年辽宁省普通本科高等学校校际合作项目(辽教发[2020]28号文件);2021—2023年辽宁省科技厅创新能力提升联合基金项目(2021-NLTS-12-04)。

摘　　要：干法制备氢氧化钙生产流程简单、生产效率高且具有良好的脱硫效果,但以矿石为原料生产的氢氧化钙在纯度和比表面积等性能方面仍需要提升。为了采用干法制备出高性能氢氧化钙,以某矿山的石灰石为原料,考察水灰比、反应时间、反应温度、添加剂、消化方式对氢氧化钙性能的影响。采用比表面积分析仪、XRD、SEM和FTIR对样品进行了表征。结果表明:在水灰比(水与石灰质量比)为0.5、反应时间为40 min、反应温度为40℃、添加4%(质量分数)PEG400、3次消化条件下制备的氢氧化钙性能最优,CaO水化率为95.28%、Ca(OH)_(2)纯度为93.91%、Ca(OH)_(2)比表面积为52.62 m^(2)/g、Ca(OH)_(2)气孔容量为0.163 cm^(3)/g,此研究为制备高性能氢氧化钙提供理论基础。Dry digestion process of calcium hydroxide production is simple,with high production efficiency and good desulfurization effect.However,calcium hydroxide produced from ore as raw material still needs to be improved in terms of purity and specific surface area.In order to prepare high⁃performance calcium hydroxide by dry digestion,the limestone of a mine was used as raw material,and the effects of water⁃cement ratio,reaction time,reaction temperature,additives and digestion mode on the performance of calcium hydroxide were investigated.The samples were characterized by specific surface area analyzers,XRD,SEM,and FT-IR.The results showed that the calcium hydroxide prepared under the conditions of water⁃cement ratio of 0.5,the reaction time of 40 min,the reaction temperature of 40℃,and three times of digestion with 4%(mass fraction)PEG400 had the best performance with a CaO hydration rate of 95.28%,a Ca(OH)_(2)purity of 93.91%,a Ca(OH)_(2)specific surface area of 52.62 m^(2)/g and a Ca(OH)_(2)stomatal capacity of 0.163 cm^(3)/g.This study provided a theoretical basis for the preparation of high⁃performance calcium hydroxide.

关 键 词：石灰石 干法工艺 氢氧化钙 多段消化 

分 类 号：TQ132.32[化学工程—无机化工]