| 摘要 |
PROBLEM TO BE SOLVED: To specify a method for realizing high particle purity with relatively short time, small consumption of raw materials and relatively low cost and to provide a simple apparatus suitable to execute the method. SOLUTION: SiO2 particles 7 are fed into a gas stream flowing toward a collision board, and are allowed to move with accelerated speed toward the collision board so that the SiO2 particles are heated and softened impurities 9 or molten aggregates 11 are stuck on the collision board and, further, purified SiO2 particles are recovered from the collision plate. The simple apparatus suitable for executing this process is equipped with a burner gas or a burner 1 which is introduced for burner gas flame, a feeding device for supplying SiO2 particles containing impurities to the burner gas or burner gas flame and the collision board to which the burner gas flame is allowed to flow.
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