JPS5715887A - Treatment of waste liquid of hydrofluoric acid containing chromium - Google Patents
Treatment of waste liquid of hydrofluoric acid containing chromiumInfo
- Publication number
- JPS5715887A JPS5715887A JP7710781A JP7710781A JPS5715887A JP S5715887 A JPS5715887 A JP S5715887A JP 7710781 A JP7710781 A JP 7710781A JP 7710781 A JP7710781 A JP 7710781A JP S5715887 A JPS5715887 A JP S5715887A
- Authority
- JP
- Japan
- Prior art keywords
- waste water
- waste liquid
- hydrofluoric acid
- slurry
- treatment
- 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.)
- Granted
Links
Abstract
PURPOSE: To solidify the whole of waste liquid and discharge no waste water at all by reducing hexavalent chromium dissolved in the waste liquid, insolubilizing the same with lime and containing the same into gypsum.
CONSTITUTION: Titled waste water is reduced by being added with, for example, methanol, so that the hexavalent chromium in the waste water is reduced to trivalent one. Next, alaked lime or quicklike is added to this reduced waste water to neutralize the same, and to convert chromium to chromium hydroxide and hydrofluoric acid to calcium fluoride, thereby preparing the waste water into a slurry. This slurry and calcined gypsum are mixed, whereby the whole of the slurry is solidified.
COPYRIGHT: (C)1982,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP56077107A JPS5921677B2 (en) | 1981-05-21 | 1981-05-21 | Treatment method for hydrofluoric acid waste liquid containing chromium |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP56077107A JPS5921677B2 (en) | 1981-05-21 | 1981-05-21 | Treatment method for hydrofluoric acid waste liquid containing chromium |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP5657373A Division JPS5641316B2 (en) | 1973-05-21 | 1973-05-21 |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5715887A true JPS5715887A (en) | 1982-01-27 |
JPS5921677B2 JPS5921677B2 (en) | 1984-05-21 |
Family
ID=13624551
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP56077107A Expired JPS5921677B2 (en) | 1981-05-21 | 1981-05-21 | Treatment method for hydrofluoric acid waste liquid containing chromium |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5921677B2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01107293A (en) * | 1987-10-20 | 1989-04-25 | Nec Corp | Character display control system |
-
1981
- 1981-05-21 JP JP56077107A patent/JPS5921677B2/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01107293A (en) * | 1987-10-20 | 1989-04-25 | Nec Corp | Character display control system |
Also Published As
Publication number | Publication date |
---|---|
JPS5921677B2 (en) | 1984-05-21 |
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