Preparation of very fine silicon oxides part- - icles

摘要

Large SiO2 particles are reduced by the hydrocarbon plasma jet from a plasma torch stabilised by liquid hydrocarbons; part of the hydrocarbon stabiliser vaporised and decomposed in the arc zone is withdrawn with the recirculating hydrocarbon liquid, separated from the liquid and used as supporting gas for the SiO2 supply. The SiO formed initially is reoxidised to SiO2 by means of H2O and/or CO2. The process expends less energy than the electric-arc method.