Method for preparing highly dispersed silica by gradient pH precipitation process
A silicon dioxide, high dispersion technology, applied in chemical instruments and methods, inorganic chemistry, silicon compounds, etc., can solve problems such as consumption of large sulfuric acid
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[0035] Example 1
[0036] A method for preparing high-dispersion silica by gradient pH precipitation method includes the following steps:
[0037] (1) Dissolve sodium silicate with a modulus of 2.5 in water to prepare a density of 1.15g / cm 3 Dilute concentrated sulfuric acid with water to prepare dilute sulfuric acid with a concentration of 1mol / L;
[0038] (2) After heating the sodium silicate solution to 70°C, first add octylphenol polyoxyethylene ether to the sodium silicate solution under stirring, and then add dilute sulfuric acid until the pH of the system is 5 , React for 10 minutes to obtain the mother liquor, the mass percentage concentration of octylphenol polyoxyethylene ether is 0.5%;
[0039] (3) Add sodium silicate solution to the mother liquor of step (2), adjust the pH value of the system to 7, after reacting for 10 minutes, continue to add sodium silicate solution to adjust the pH value to 9, after reacting for 10 minutes, continue to add Adjust the pH value of sodiu...
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[0042] Example 2
[0043] A method for preparing high-dispersion silica by gradient pH precipitation method includes the following steps:
[0044] (1) Dissolve sodium silicate with a modulus of 3.5 in water to prepare a density of 1.25g / cm 3 Dilute concentrated sulfuric acid with water to prepare dilute sulfuric acid with a concentration of 3mol / L;
[0045] (2) After heating the sodium silicate solution to 90°C, under stirring, add octylphenol polyoxyethylene ether to the sodium silicate solution, mix well, and then add dilute sulfuric acid until the pH of the system is 5 , React for 10 minutes to obtain mother liquor, the mass percentage concentration of octylphenol polyoxyethylene ether is 1%;
[0046] (3) Add sodium silicate solution to the mother liquor of step (2), adjust the pH value of the system to 7, after reacting for 10 minutes, continue to add sodium silicate solution to adjust the pH value to 9, after reacting for 10 minutes, continue to add Adjust the pH value of sodium...
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