To provide a method for separating zinc from a galvanized steel scrap in which zinc can be efficiently removed without dissolving and sticking iron.
The method for separating zinc from a galvanized steel scrap includes heating the scrap from the temperature (770°C) showing the magnetic transformation point of iron to the temperature (910°C) showing the transformation point from α-iron to γ-iron in the presence of a reducing agent in a dezincification furnace 11, reducing zinc oxide contained in the galvanized steel scrap to convert it to metal zinc, and separating the metal zinc by volatilization. The reducing agent is carbon such as carbon powder. The amount of the reducing agent to be added is preferably 0.1-10 mass% based on the galvanized steel scrap. The pressure in the dezincification furnace 11 is preferably set to ordinary pressure to a reduced pressure of 101.15-81.25 kPa. The inside of the dezincification furnace 11 is preferably set to a reducing atmosphere or an inert gas atmosphere.
COPYRIGHT: (C)2010,JPO&INPIT
Kitahara Tadaki
Naoki Tanahashi
Masahiro Tabata
Takahiro Yamada
TOYOTA JIDOSHA KABUSHIKI KAISHA
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Makoto Onda