FR2163958A6 - Cyanide washings - are converted to harmless cyanate by automatic additions of oxidising agent - Google Patents

Cyanide washings - are converted to harmless cyanate by automatic additions of oxidising agent

Info

Publication number
FR2163958A6
FR2163958A6 FR7143983A FR7143983A FR2163958A6 FR 2163958 A6 FR2163958 A6 FR 2163958A6 FR 7143983 A FR7143983 A FR 7143983A FR 7143983 A FR7143983 A FR 7143983A FR 2163958 A6 FR2163958 A6 FR 2163958A6
Authority
FR
France
Prior art keywords
cyanide
washings
addition
cyanate
harmless
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.)
Expired
Application number
FR7143983A
Other languages
French (fr)
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.)
Air Liquide SA
Original Assignee
Air Liquide SA
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 Air Liquide SA filed Critical Air Liquide SA
Priority to FR7143983A priority Critical patent/FR2163958A6/en
Application granted granted Critical
Publication of FR2163958A6 publication Critical patent/FR2163958A6/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/72—Treatment of water, waste water, or sewage by oxidation
    • C02F1/722—Oxidation by peroxides
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/16—Nitrogen compounds, e.g. ammonia
    • C02F2101/18—Cyanides

Abstract

Treatment of ind. effluent is carried out by converting dissolved toxic cyanides to non-toxic hydrolysable cyanates by addition of a mineral or organic peroxy acid or its salt according to parent patent, where the washings from objects treated with cyanide are instantly neutralised by this addition in a closed circuit process, allowing recirculation of effluent. Appearance of cyanide is sensed by a pair of Ag-calomel electrodes with a millivoltmeter which operates valves controlling oxidiser additions. A pH meter controls alkali addition to pH 8.5-9.8.
FR7143983A 1971-12-08 1971-12-08 Cyanide washings - are converted to harmless cyanate by automatic additions of oxidising agent Expired FR2163958A6 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7143983A FR2163958A6 (en) 1971-12-08 1971-12-08 Cyanide washings - are converted to harmless cyanate by automatic additions of oxidising agent

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7143983A FR2163958A6 (en) 1971-12-08 1971-12-08 Cyanide washings - are converted to harmless cyanate by automatic additions of oxidising agent

Publications (1)

Publication Number Publication Date
FR2163958A6 true FR2163958A6 (en) 1973-07-27

Family

ID=9087113

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7143983A Expired FR2163958A6 (en) 1971-12-08 1971-12-08 Cyanide washings - are converted to harmless cyanate by automatic additions of oxidising agent

Country Status (1)

Country Link
FR (1) FR2163958A6 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110980916A (en) * 2019-11-14 2020-04-10 东北大学 Method for degrading thiocyanate in cyanogen-containing barren solution under acidic condition

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110980916A (en) * 2019-11-14 2020-04-10 东北大学 Method for degrading thiocyanate in cyanogen-containing barren solution under acidic condition
CN110980916B (en) * 2019-11-14 2021-03-26 东北大学 Method for degrading thiocyanate in cyanogen-containing barren solution under acidic condition

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