摘要
以火电厂脱硫石膏为原料,采用常压酸化法制备高品质硫酸钙晶须。利用XRD、TG、显微图像仪等对其进行表征,系统分析了原料预处理前后硫酸浓度、脱硫石膏质量浓度和硫酸循环使用对硫酸钙晶须的影响。结果表明,脱硫石膏进行预处理可将部分杂质(如CaCO_(3)、Al_(2)O_(3)等)脱除,预处理后的脱硫石膏颜色明显变浅,制备的硫酸钙晶须长径比增加、形貌均匀。当硫酸浓度为2 mol/L、脱硫石膏质量浓度为10 g/L时,硫酸钙晶须呈纤维状、尺寸均匀、长径比较大。硫酸循环使用2次,硫酸钙晶须形貌依然较好、尺寸均匀。
High quality calcium sulfate whisker is prepared via atmospheric acidification method with desulfurization gypsum from thermal power plant as raw material,and characterized by XRD,TG and microscope images.Effects of the concentration of sulfuric acid before and after raw material pretreatment,desulfurization gypsum dosage and sulfuric acid recycling on calcium sulfate whisker are systematically analyzed.It is shown that some impurities(including CaCO_(3),Al_(2)O_(3),etc.)in desulfurization gypsum can be removed by pretreatment.After pretreatment,the color of desulfurization gypsum becomes obviously lighter,the length-diameter ratio of prepared calcium sulfate whisker is therefore increased,and the morphology is relatively uniform.The prepared calcium sulfate whisker is fibrous,uniform in size and large in length-diameter ratio when the concentration of sulfuric acid is 2 mol·L^(-1) and the dosage of desulfurization gypsum is 10 g·L^(-1).After sulfuric acid has been used for two cycles,calcium sulfate whisker remains good morphology and uniform size.
作者
田雨
赵玉
詹华
王虹
李翠清
宋永吉
TIAN Yu;ZHAO Yu;ZHAN Hua;WANG Hong;LI Cui-qing;SONG Yong-ji(Faculty of Environment and Life,Beijing University of Technology,Beijing 100124,China;School of Chemical Engineering,Beijing Institute of Petrochemical Technology,Beijing 102617,China)
出处
《现代化工》
CAS
CSCD
北大核心
2022年第1期173-177,共5页
Modern Chemical Industry
基金
国家自然科学基金项目(21673290)。
关键词
烟气脱硫石膏
常压酸化法
硫酸钙晶须
gypsum from flue gas desulfurization
atmospheric acidification method
calcium sulfate whisker
