【摘要】 通过红外光谱测试技术，研究二氧化硅质量浓度、模数以及放置时间对苛碱体系低模数m（m≤1）硅酸钠溶液结构的影响，比较纯硅酸钠溶液和预脱硅溶液在结构上的差异。研究结果表明：苛碱体系预脱硅溶液结构与纯硅酸钠溶液结构相似，模数0.75≤m≤1.00，ρ（SiO₂）≤20 g/L的硅酸钠溶液主要含有硅氧环状和三元环状这2种复杂阴离子；模数m≤0.50、30≤ρ（SiO₂）≤50 g/L的硅酸钠溶液以单体和线型这2种简单形态出现；钠硅渣形成过程主要消耗单体硅酸根离子，ρ（SiO₂）=50 g/L左右的预脱硅溶液结构稳定，溶液中的铝酸根离子不会影响硅酸根离子结构。更多还原

【Abstract】 The effect of silica mass concentration, modulus and time on the structure of low-modulus（m≤1）sodium silicate solution in alkali system was studied using infrared spectra, and the differences of the structure between sodium silicate solution and pre-desilication solution were compared. The results show that the structure of pre-desilication solution is similar to that of sodium silicate solution in alkali system. In sodium silicate solution（modulus m is 0.75-1.00, ρ（SiO₂）≤20 g/L）, the structures of silicate ion appear in two complex forms of Si—O cyclic and three elements cyclic silicate ions. However, the ionic structures of sodium silicate solution with modulus m≤0.5, 30≤ ρ（SiO₂） ≤50 g/L are simple in monomer and linear forms. The formation of sodium aluminosilicate hydrate is mainly consumed by monomer silicate ions, and the structure of pre-desilication solution with silica mass concentration of about 50 g/L is stable, which will not be affected by aluminate ions in solution.更多还原