生料粉磨环境下石灰石低温半干法固硫特性研究  

Research on the Low Temperature Semi-dry Desulfurization by Limestone under Raw Meal Grinding Circumstance

作　　者：王俊杰[1] 房晶瑞[1] 王金宜 汪澜[1] WANG Jun-jie;FANG Jing-rui;WANG Jin-yi;WANG Lan(State Key Laboratory of Green Building Materials,China Building Materials Academy,Beijing 100024,China;School of Material Science and Engineering,Hebei University of Science and Technology,Shijiazhuang 050018,China)

机构地区：[1]中国建筑材料科学研究总院,绿色建筑材料国家重点实验室,北京100024 [2]河北科技大学材料科学与工程学院,石家庄050018

出　　处：《硅酸盐通报》2019年第8期2420-2425,共6页Bulletin of the Chinese Ceramic Society

基　　金：国家重点研发计划课题(2017YFC0210801)

摘　　要：水泥生产中石灰石粉磨和烘干工序具有显著的SO 2吸收特性,其属于半干法脱硫。采用固定床实验装置,设计了石英砂作为空白对照,研究了反应温度、石灰石含水率对石灰石低温半干法固硫的影响。结果表明,当石灰石含水率为20%,反应温度从50℃升高到100℃时,石灰石对SO 2的吸附量从1.06 mg SO 2/g石灰石下降至0.32 mg SO 2/g石灰石,随温度升高而降低;其中SO 2物理吸附比例从4.72%最高增加至17.81%,随温度升高而增大。当含水率为5%、10%和20%时,在50~100℃内石灰石颗粒对SO 2的平均吸附量分别为0.14 mg SO 2/g、0.25 mg SO 2/g和0.60 mg SO 2/g石灰石,其中SO 2物理吸附比例分别为38.60%、17.66%和11.22%;SO 2吸附量随含水率增加而显著增大,而物理吸附比例随含水率增加而显著降低。采用积分计算的石灰石SO 3含量增加值与荧光分析结果相吻合,而与硫酸钡重量法检测结果不一致,表明石灰石低温半干法固硫产物以亚硫酸盐、亚硫酸氢盐等为主,而不是硫酸盐。The SO 2 emission is reduced significantly during the limestone drying and grinding stage of the cement manufacture process,which belongs to the semi-dry desulfurization.This article was to illustrate the effect of reaction temperature and moisture content on the SO 2 absorption at low temperature by limestone,through the fixed-bed experimental set-up and the quartz sand designed as the blank comparison group.Results show that when the limestone moisture content set as 20%and the reaction temperature varying between 50-100℃,the SO 2 absorption amount is about 0.32-1.06 mg SO 2/g limestone and increased significantly with the drop of temperature,of which 4.72%-17.81%belongs to the physical absorption,which increased with the rise of temperature.The average SO 2 absorption amount during 50-100℃is 0.14 mg SO 2/g,0.25 mg SO 2/g and 0.60 mg SO 2/g limestone and the proportion of physical absorption is 38.60%,17.66%and 11.22%when the moisture content is 5%,10%and 20%respectively.The SO 2 absorption amount increased obviously with the increase of limestone moisture content,while the proportion of physical absorption decreased significantly with the increase of limestone moisture content.The SO 3 content of limestone after desulfurization by the integral calculation is in accordance with the SO 3 content by the fluorometric analysis,and has no relation with the results by barium sulfate gravimetry,which demonstrated that the desulfurization product is mainly calcium sulfite,calcium bisulfate,rather than calcium sulfate.

关 键 词：石灰石 半干法脱硫 物理吸附 化学反应 

分 类 号：X511[环境科学与工程—环境工程] TU522.061[建筑科学—建筑技术科学]