Regarding the whiteness issue of fumed silica? ?
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The product obtained in my experiments appeared, when observed with the naked eye in the reaction vessel (glass apparatus), to be powdery and white in color. However, after removing it, it gradually turned light yellow-green; I think this is the color of chloride ions in products that have not undergone deacidification. Do you have any other opinions? Let’s discuss this! ! Thank you. I would like to ask everyone whether, in actual production, more water or more silicon tetrachloride is used. Additionally, what exactly should be the drying temperature for the product? In my experiments, it turned out that when products of the type SiO2.nH2O are dried using an electric furnace, the crystalline water is removed, leaving basically sand! Please give me some guidance! !
Pale yellow-green is the color of chloride ions. It’s likely due to an excess of water vapor; as for the temperature, it depends on the requirements of your product. When all the water is removed, it’s just useless sand
Thank you! Could you please provide some more detailed information, or some industrial data?