论文部分内容阅读
对冶金固体废弃物精细化利用过程中中间体含镁、铝离子硅酸体系中硅酸胶凝时间、单硅酸聚合速度及溶胶胶粒生长进行了研究.结果表明,在pH<4的酸性范围内,Mg2+与Al3+离子促进硅酸的聚合反应,在反应初期Al3+已明显促进反应进行.且Al3+与硅酸负离子、OH的结合能力均强于Mg2+,其对硅酸的促凝作用较强;Mg2+和Al3+等浓度共存时,促凝效果介于单金属离子之间;Mg2+与Al3+促进了硅酸体系中溶胶胶粒的生长及SiO2粒子的长大,Al3+进入凝胶内部取代硅形成四面体配位;凝胶后所得SiO2为非晶态结构.
This paper studied the gelation time of silicic acid, the polymerization rate of monosilicic acid and the growth of colloidal silica in the Mg-containing and Al-containing silicic acid intermediate system during the refinement and utilization of metallurgical solid waste.The results showed that under acidic conditions of pH <4 , Al2 + and Al3 + promoted the polymerization of silicic acid, and Al3 + promoted the reaction obviously at the initial stage of reaction, and the binding ability of Al3 + with silicic acid anion and OH was stronger than that of Mg2 + ; When the concentrations of Mg2 + and Al3 + coexist, the procoagulant effect is between the single metal ions; Mg2 + and Al3 + promote the growth of sol particles and the growth of SiO2 particles in the silicic acid system. Al3 + Body coordination; after the gel obtained SiO2 amorphous structure.