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Title:
亜鉛鋼材屑からの亜鉛分離方法
Document Type and Number:
Japanese Patent JP5425486
Kind Code:
B2
Abstract:

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


Inventors:
Tsutomu Kizaki
Kitahara Tadaki
Naotaka Tanahashi
Masahiro Tabata
Takahiro Yamada
Application Number:
JP2009027668A
Publication Date:
February 26, 2014
Filing Date:
February 09, 2009
Export Citation:
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Assignee:
Chubu Electric Power Co., Inc.
TOYOTA JIDOSHA KABUSHIKI KAISHA
International Classes:
C22B19/30; C22B5/10; C22B5/16; C22B7/00; C22B9/22; C22B19/12; C22B19/34; F27D11/06
Domestic Patent References:
JP971826A
JP2007270229A
JP7138664A
JP6108175A
JP6287657A
JP6184657A
JP200637146A
Attorney, Agent or Firm:
Hironobu Onda
Makoto Onda



 
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