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When flying dusts or burnt main dusts are molten down, heavy metals and salts contained in those dusts with low boiling point are volatily diffused and dusts like heavy metals which are more concentrated than flying dusts appear.
These are called molten flying dusts and are equal to about several % of the quantity of molten flying dusts.
As molten flying dusts contain heavy metals which have higher concentration than that of original burnt flying dusts, more rigorous way for handling than that of burnt flying dusts is required.
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