Title:
TREATMENT METHOD OF WASTE WATER
Document Type and Number:
Japanese Patent JP2017160496
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a treatment method of waste water for reducing cadmium concentration in a solution containing cadmium and lead with high chloride ion concentration, capable of achieving reduction of efficient cadmium concentration safely at low cost.SOLUTION: There is provided a treatment method of waste water containing cadmium and lead and having chloride ion concentration of 0.2 mol/l to 1.5 mol/l, including a neutralization treatment process ST61 for conducting a neutralization treatment generating neutralized precipitate by adding a neutralization agent to waste water to adjust pH to 10 to 11, a sulfidization process ST62 for conducting a sulfidizing treatment generating metal sulfide by adding a sulfidizing agent to waste water after the neutralization treatment to adjust oxydation reduction potential (Ag/AgCl electrode basis) to -200 mV to -40 mV and a solid solution separation process ST63 for solid liquid separating a slurry containing the neutralized precipitate and the metal sulfide.SELECTED DRAWING: Figure 2
Inventors:
KOMORI SHINTARO
TOMOTA KATSUHIRO
WATANABE HIROSHI
FUJIYAMA HAJIME
TOMOTA KATSUHIRO
WATANABE HIROSHI
FUJIYAMA HAJIME
Application Number:
JP2016046769A
Publication Date:
September 14, 2017
Filing Date:
March 10, 2016
Export Citation:
Assignee:
SUMITOMO METAL MINING CO
International Classes:
C22B3/20; C02F1/62; C22B3/44; C22B7/02; C22B19/20
Domestic Patent References:
| JPH07214029A | 1995-08-15 | |||
| JPH07109533A | 1995-04-25 | |||
| JP2014168767A | 2014-09-18 | |||
| JP2015020103A | 2015-02-02 |
Attorney, Agent or Firm:
Masayuki Masabayashi
Hayashi Ichiyoshi
Hayashi Ichiyoshi
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