Title:
亜鉛めっき廃液からの亜鉛回収方法
Document Type and Number:
Japanese Patent JP5719320
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a method of producing economically recyclable high concentration zinc cake of a zinc concentration of at least 40%, by efficiently separating zinc present in a waste galvanization solution from iron at low cost.SOLUTION: A zinc composition including at least 40% of zinc per dry weight is recovered by an air-oxidation process of adding an alkali into a waste galvanizing solution comprising a zinc ion and a ferric ion each at least in a predetermined concentration and further comprising heavy metal to maintain its pH in a range of 4.5 to 5.5, blowing air thereinto to oxidize the ferric ion to a ferrous ion, and subsequently precipitating the ferrous ion as ferrous hydroxide; a first solid-liquid separation process of adding a chelating agent into the treated solution obtained and subsequently carrying out solid-liquid separation; a pH adjustment process of adding an alkali to the separated solution obtained to control its pH between 8 and 11 to precipitate zinc hydroxide; a second solid-liquid separation process of subjecting the treated solution obtained to solid-liquid separation; and washing the solid matter obtained.
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Inventors:
Shigeki Fujiwara
Youhei Tomita
Hiroshi Tsuchiya
Satoru Udagawa
Akemi Otani
Youhei Tomita
Hiroshi Tsuchiya
Satoru Udagawa
Akemi Otani
Application Number:
JP2012015583A
Publication Date:
May 13, 2015
Filing Date:
January 27, 2012
Export Citation:
Assignee:
JFE Engineering Corporation
jfe environment Co., Ltd.
jfe environment Co., Ltd.
International Classes:
C22B19/30; C02F1/62; C02F1/64; C02F1/74; C22B3/44; C22B7/00
Domestic Patent References:
| JP2011157568A | ||||
| JP2002030352A | ||||
| JP2004202488A | ||||
| JP2008266774A | ||||
| JP62253738A | ||||
| JP61261446A | ||||
| JP2010284593A | ||||
| JP2000117270A | ||||
| JP2012082458A |
Attorney, Agent or Firm:
Masahiro Tanaka