JPS57204289A - Removal of metallic component - Google Patents
Removal of metallic componentInfo
- Publication number
- JPS57204289A JPS57204289A JP8745481A JP8745481A JPS57204289A JP S57204289 A JPS57204289 A JP S57204289A JP 8745481 A JP8745481 A JP 8745481A JP 8745481 A JP8745481 A JP 8745481A JP S57204289 A JPS57204289 A JP S57204289A
- Authority
- JP
- Japan
- Prior art keywords
- solution
- addition
- aqueous solution
- hexavalent chromium
- compound
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Removal Of Specific Substances (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
Abstract
PURPOSE: To efficientry remove metallic components from an aqueous solution containing a hexavalent chromium compound and a nickel and/or zinc compound, by adding diammonium sulfite to the aqueous solution, reducing the solution under an acidic condition, and then neutralizing it.
CONSTITUTION: An aqueous solution containing a hexavalent chromium compound and a nickel and/or zinc compound is adjusted at pH 1.0W3.0 by addition of sulfuric acid or the like. To this acidified solution is then added a 5W10wt% aqueous diammonium sulfite solution as a reducing agent to convert the hexavalent chromium compound into a trivalent one. Thereafter, the aqueous solution is adjusted at pH 8W12 by addition of a neutralizer such as sodium hydroxide. The precipitated metal hydroxides are filtered and removed from the solution. The addition of the diammonium sulfite solution is continued until oxidation- reduction potential reaches the lowest level. Its addition amount is 1.0W2.0 equivalent per part of the chromium component in general.
COPYRIGHT: (C)1982,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8745481A JPS57204289A (en) | 1981-06-09 | 1981-06-09 | Removal of metallic component |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8745481A JPS57204289A (en) | 1981-06-09 | 1981-06-09 | Removal of metallic component |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS57204289A true JPS57204289A (en) | 1982-12-14 |
Family
ID=13915299
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP8745481A Pending JPS57204289A (en) | 1981-06-09 | 1981-06-09 | Removal of metallic component |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS57204289A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63267494A (en) * | 1987-04-27 | 1988-11-04 | Nkk Corp | Treatment of waste liquid containing hexavalent chromium |
-
1981
- 1981-06-09 JP JP8745481A patent/JPS57204289A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63267494A (en) * | 1987-04-27 | 1988-11-04 | Nkk Corp | Treatment of waste liquid containing hexavalent chromium |
JPH0521636B2 (en) * | 1987-04-27 | 1993-03-25 | Nippon Kokan Kk |
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