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    2020-5-21  Scheme 5.9: Reaction ofzircon carbochlorination . During the first cooling, zirconium tetrachloride, containing hafnium as impurity, is collected as a powder. Silicon tetrachloride is condensed following further condensation and is subsequently purified and used to produce fumed silica, fused quartz and fused quartz optical fibre [2, 12].

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