摘要
基于电解锰渣成分及水化硅酸钙(C-S-H)材料的结构特性,提出以电解锰渣为原料制备C-S-H材料,开发电解锰渣基C-S-H材料制备新技术。系统研究由电解锰渣制备C-S-H材料过程中反应pH值、反应温度、晶化时间等因素对合成C-S-H材料的矿相、微观结构和溶钙性能的影响。结果表明:C-S-H产品的种类、微观结构及其溶钙性能与反应工艺条件紧密相关,在优化工艺条件下(反应pH值12.0、反应温度100℃、晶化时间10 h)制备所得的C-S-H材料结构酥松,其比表面积为205.0 m^2/g,总孔孔容为0.68 cm^3/g,且溶钙能力最强,溶出钙离子浓度为11.52 mg/L,适合作为吸附除磷材料在水处理过程中使用。
Based on the composition of electrolytic manganese residue(EMR)and the structural characteristics of hydrated calcium silicate(C-S-H)material,a novel technology was used for EMR based C-S-H material preparation using EMR as raw material.Calcium silicate hydrate(C-S-H)was synthesized from electrolytic manganese residue(EMR)via a hydrothermal synthetic procedure.The major factors influencing the crystalline phase,microstructure and Ca2+release capacity of C-S-H were investigated in the aspects of reaction pH value,reaction temperature and crystallization time.The results show that the crystalline phase,microstructure and Ca2+release capacity of C-S-H are greatly affected by the reaction pH value,reaction temperature and crystallization time during the preparation process.And the optimal condition for C-S-H synthesized from electrolytic manganese residue is determined to reaction pH value of 12.0,reaction temperature of 100℃and crystallization time of 10 h.And the product synthesized under the optimal condition is identified to be a calcium silicate hydrate with a specific surface area and pore volume of 205 m^2/g and 0.68 cm^3/g,respectively.Meanwhile,under the above conditions,Ca2+release capacity is 11.52 mg/L,making this material a promising candidate for removal of phosphate ions diluted in wastewater.
作者
李昌新
喻源
张庆武
汪洋
钟宏
王帅
LI Chang-xin;YU Yuan;ZHANG Qing-wu;WANG Yang;ZHONG Hong;WANG Shuai(College of safety Science and Engineering,Nanjing Technology University,Nanjing 211816,China;College of Chemistry and Chemical Engineering,Central South University,Changsha 410083,China;Hunan Provincial Key Laboratory of Efficient and Clean Utilization of Manganese Resources,Central South University,Changsha 410083,China)
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2020年第6期1368-1376,共9页
The Chinese Journal of Nonferrous Metals
基金
中国博士后科学基金资助项目(2017M611799)
江苏省基础研究计划(自然科学基金)—青年基金项目(BK20190690)
湖南省科技计划项目(2016TP1007)
锰资源高效清洁利用湖南省重点实验室开放研究基金(MN2018K02)。
关键词
电解锰渣
水化硅酸钙
合成条件
微观结构
溶钙性能
electrolytic manganese residue
calcium silicate hydrate
synthesis condition
microstructure
Ca2+release capacity
