| 摘要 |
A mixture of fluid fuel and oxygen is burned at a substantially constant rate to produce hot flame gases. Silicon tetrafluoride is commingled with these hot gases and is thus hydrolyzed. The concentration of silicon tetrafluoride in the hydrolysis mixture is established at a selected value which corresponds in direct proportion to the surface area desired of the silica product, i.e., the surface area of the silica is increased by raising the concentration of silicon tetrafluoride in the hydrolysis mixture, and vice versa.
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