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Title:
有価金属及びセメント原料に適する品質のスラグの回収方法
Document Type and Number:
Japanese Patent JP4271196
Kind Code:
B2
Abstract:

To provide a method for recovering a valuable metal, which lowers the chlorine content to 2 mass% or below but prevents the valuable metal from being eluted into a washing liquid by dechlorination-washing fly ash containing the valuable metal and chlorine under a specified pH condition prior to an operation for recovering the valuable metal.

The valuable metal recovery method comprises the steps of: dechlorination-washing fly ash containing the valuable metal and chlorine with a washing liquid with a pH of 10 to 12; mixing the dechlorinated fly ash, a zinc-containing raw material, a flux, and coal; drying the mixture; crushing the dried product; forming the crushed product into an agglomerated ore; and melt-reducing the agglomerated ore. Alternatively, the valuable metal recovery method comprises the steps of: recovering zinc as crude zinc oxide by melt-reduction of the agglomerated ore; further dechlorination-washing the recovered crude zinc oxide with a washing liquid with a pH of 10 to 12; and using the dechlorinated crude zinc oxide in zinc refining.

COPYRIGHT: (C)2007,JPO&INPIT


Inventors:
Nagasaki Hidenori
Takuji Yoshida
Tokuichi Hiroyuki
Shinji Noda
Sekiguchi Tomoo
Hiroshi Sato
Application Number:
JP2006006461A
Publication Date:
June 03, 2009
Filing Date:
January 13, 2006
Export Citation:
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Assignee:
Mitsui Mining & Smelting Co., Ltd.
International Classes:
C22B19/30; C04B18/30; C22B1/248; C22B7/02; C22B13/02; C22B15/02; C22B19/36
Domestic Patent References:
JP2002018394A
JP10053820A
JP2003130318A
JP7268500A
Attorney, Agent or Firm:
Hiroyuki Kurihara
Muranaka