摘要
针对硅酸聚合胶凝而使聚硅酸金属盐混凝剂失活的特性,研究了Fe3+、Al3+、Cu2+和Mg2+金属离子对硅酸聚合胶凝曲线的影响作用.结果表明:在酸性实验pH范围内,对硅酸的阻聚作用的大小顺序为:Fe3+>Al3+>Cu2+>Mg2+.认为其影响作用是由于金属离子与硅酸的化学反应所致,但主要的还是对溶液中pH值的缓冲效应.对铁Fe3而言,由于其具有强烈的水解倾向,对羟基具有较好的捕获能力,从而减少了因硅酸聚合而释放出的OH-的催化影响作用,因而表现出良好的阻聚效应.
The effects of metal ions such as Fe3+?Al3+?Cu2+ and Mg2+ on the silicic acid polymerization and gel were studied. The experimental results show that the ability of anti-polymerization of metal ions is in the order: Fe3+>Al3+>Cu2+>Mg2+. The effects were attributed partly to the reaction between metal ions and silicic acid and mainly to the buffer effects of metal ions. The iron ion is the best due to its hydrolysis inclination and hydroxyl capturing ability.
出处
《北方交通大学学报》
CSCD
北大核心
2003年第6期97-100,共4页
Journal of Northern Jiaotong University
基金
北方交通大学校基金资助(2002SM050)
关键词
分析化学
硅酸聚合
金属离子
阻凝效应
anahytical chemistry
silicic acid polymerization
metal ion
resistance polymerization effect
