JPS5715887A - Treatment of waste liquid of hydrofluoric acid containing chromium - Google Patents

Treatment of waste liquid of hydrofluoric acid containing chromium

Info

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
Application number
JP7710781A
Other languages
Japanese (ja)
Other versions
JPS5921677B2 (en
Inventor
Shoji Tsuruta
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JNC Corp
Original Assignee
Chisso Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Chisso Corp filed Critical Chisso Corp
Priority to JP56077107A priority Critical patent/JPS5921677B2/en
Publication of JPS5715887A publication Critical patent/JPS5715887A/en
Publication of JPS5921677B2 publication Critical patent/JPS5921677B2/en
Expired legal-status Critical Current

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
JP56077107A 1981-05-21 1981-05-21 Treatment method for hydrofluoric acid waste liquid containing chromium Expired JPS5921677B2 (en)

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)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01107293A (en) * 1987-10-20 1989-04-25 Nec Corp Character display control system

Cited By (1)

* Cited by examiner, † Cited by third party
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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