Title:
ニッケル、亜鉛含有排水あるいはスラッジからのニッケル、亜鉛の分離回収方法
Document Type and Number:
Japanese Patent JP4146078
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a method for cleaning water while markedly reducing the quantity of sludge generated as compared with a conventional method by recovering nickel and zinc in wastewater at the time of treatment of nickel and zinc-containing wastewater and recovering nickel and zinc from existing sludge. SOLUTION: In a wastewater treatment and valuable metal recovery method, the pH of nickel and zinc-containing wastewater is adjusted to 0.5-4 and the pH of the resulting solution is again adjusted to 13 or more to separate and recover liquids respectively containing nickel hydroxide and zinc or sludge comprising nickel hydroxide and/or zinc hydroxide is dissolved using an acid and the pH of the obtained solution is adjusted to 0.5-4 and, thereafter, the pH of the solution is again adjusted to 13 or more to separate and recover liquids respectively containing nickel hydroxide and zinc.
Inventors:
Kimio Ito
Toshiro Kato
Miki
Toshiro Kato
Miki
Application Number:
JP2000398347A
Publication Date:
September 03, 2008
Filing Date:
December 27, 2000
Export Citation:
Assignee:
Nippon Steel Corporation
International Classes:
B01D71/02; C02F1/62; C02F1/461; C02F1/72; C22B3/44; C22B7/00; C22B19/00; C22B19/20; C22B23/00; C25C1/08; C25C1/16
Domestic Patent References:
| JP62253738A | ||||
| JP50009538A | ||||
| JP50027717A | ||||
| JP2000117270A | ||||
| JP11221575A | ||||
| JP53090162A | ||||
| JP49064564A |
Attorney, Agent or Firm:
Mikio Hatta
Atsushi Nogami
Yasuo Nara
Etsuko Saito
Katsuyuki Utani
Atsushi Nogami
Yasuo Nara
Etsuko Saito
Katsuyuki Utani
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