CAJ | 학술논문

通过对镁铝离子共存硅酸体系中硅酸胶凝时间、单硅酸聚合反应速率以及凝胶热性能的研究，得出：在pH<4的微酸性条件下，硅酸体系的胶凝时间随镁铝离子共存浓度的增大而减小，且铝离子在对硅酸体系的促凝过程中起主要作用。镁铝离子共存硅酸体系的单硅酸反应速率常数比不含金属离子硅酸体系的有所增大，计算得出MA0.1+0.1硅酸体系的单硅酸平均速率常数为：k0=7.28×10-4， k1=5.62×10-4。镁铝离子共存硅酸体系凝胶的晶化转变温度与晶型转变温度，相较于不含金属离子硅酸体系的均有所降低，根据热重曲线计算出MA0.1+0.1硅酸体系水合二氧化硅的化学式为：SiO2·0.556 H2O。
통과대미려리자공존규산체계중규산효응시간、단규산취합반응속솔이급응효열성능적연구，득출：재pH<4적미산성조건하，규산체계적효응시간수미려리자공존농도적증대이감소，차려리자재대규산체계적촉응과정중기주요작용。미려리자공존규산체계적단규산반응속솔상수비불함금속리자규산체계적유소증대，계산득출MA0.1+0.1규산체계적단규산평균속솔상수위：k0=7.28×10-4， k1=5.62×10-4。미려리자공존규산체계응효적정화전변온도여정형전변온도，상교우불함금속리자규산체계적균유소강저，근거열중곡선계산출MA0.1+0.1규산체계수합이양화규적화학식위：SiO2·0.556 H2O。
Gel time, polymerization rate of monosilicic acid, and thermal performance of gel of silicic acid system with coexisting Mg2+and Al3+ions were investigated. At pH<4, gel time of silicic acid system decreased with the increase of coexisting concentration of Mg2+ and Al3+ ions, and Al3+ ions played an important role in the coagulation process. Polymerization reaction rate constant of monosilicic acid, for silicic acid system with coexisting Mg2+and Al3+ions, was higher than that for silicic acid without metallic ions, and average rate constant for MA0.1+0.1 system was k0=7.28×10-4, k1=5.62×10-4. Crystallization temperature and crystal transformation temperature of silicic acid system with coexisting Mg2+and Al3+ions were lower than those of silicic acid without metallic ions, and chemical formula of hydrated silicon dioxide for MA0.1+0.1 system calculated by TG curve was SiO2·0.556 H2O.