Control Of Micron Spherical Silica Powder Preparation

Spherical silica which has great applied value is not only an important supporting material of some high-end industries such as electronic information, aviation, but also was widely used in new paint, special type ceramics and slap-up cosmetics industries. The aim of this paper was to synthesize the spherical shape SiO₂ powder through the emulsion method presented in this article. The details are described as below.The factors that impact the stability of emulsion were researched and the results indicated that the emulsion could maintain stability when the dosage of emulsifying agent reached from 1%to 4%(by quantity) and the rotate speed reached 300r/min.The factors which impact the diameter of sample which was synthesized through the emulsion method were researched. The quantity of emulsifying agent and rotate speed were the most important factors that influence the diameter of sample after analyzing all the factors which may influence the reaction. The experimental results indicated that the diameter of samples will change when the quantity of emulsifying agent and rotate speed change. Samples which diameter change from 5μm to 40μm could be synthesized by adjust the quantity of emulsifying agent and rotate speed.The factors which impact the yield were researched. The amount of water glass and 5% sulfuric acid were the most important factors which influence the yield and the quantity of emulsifying agent and rotate speed influence the yield by somewhat means. The reaction temperature can hardly influence the yield. The density experiments indicated that the sample density would increase when the temperature increase.Lastly, the magnified experiment was designed and its results indicated that the reaction process was extreme different from the laboratory reaction process and the quality was not as good as the laboratory's samples: the yield decreased about 30%, the sphericity got bad and the distributing of sample became wider.