Structure of low-modulus sodium silicate solution in alkali system
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.
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