OXIDATIVE ROASTING OF BLACK DROSS AND SALT CAKE
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United States of America Patent
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Issued Date -
Aug 18, 2022
app pub date -
Jun 26, 2020
filing date -
Jun 27, 2019
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Abstract
Salt components of dross can be extracted efficiently through evaporation. During dross treatment, temperatures can be permitted to approach or exceed the boiling point of one or more salt components of the dross, preferably in an oxidizing environment. The temperature can be held sufficiently high such that the salt content can exert an appreciable vapor pressure and can be held for a sufficient time to permit most, all, or substantially all of the salt content to evaporate and be carried away from the kiln in combustion gasses. The evaporated salt can be condensed and collected.
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