JPS558402A - Recovering method for useful substance contained in aged chromic acid solution - Google Patents

Recovering method for useful substance contained in aged chromic acid solution

Info

Publication number
JPS558402A
JPS558402A JP7852578A JP7852578A JPS558402A JP S558402 A JPS558402 A JP S558402A JP 7852578 A JP7852578 A JP 7852578A JP 7852578 A JP7852578 A JP 7852578A JP S558402 A JPS558402 A JP S558402A
Authority
JP
Japan
Prior art keywords
soln
aged
dryness
chromic acid
contained
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
JP7852578A
Other languages
Japanese (ja)
Other versions
JPS5935842B2 (en
Inventor
Minoru Hattori
Ryoichi Kashiwagi
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.)
Nippon Denko Co Ltd
Original Assignee
Nippon Denko Co Ltd
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 Nippon Denko Co Ltd filed Critical Nippon Denko Co Ltd
Priority to JP53078525A priority Critical patent/JPS5935842B2/en
Publication of JPS558402A publication Critical patent/JPS558402A/en
Publication of JPS5935842B2 publication Critical patent/JPS5935842B2/en
Expired legal-status Critical Current

Links

Classifications

    • Y02W30/54—

Landscapes

  • Inorganic Compounds Of Heavy Metals (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Abstract

PURPOSE: To recover chromic acid contained in an aged chromium-plating soln. as Cr2O3, by neutralizing the aged chromium-plating soln. or a chromate-treatment soln. with ammonia to precipitate and separate the heavy metals contained in the soln., then by evaporating the residual soln. to dryness.
CONSTITUTION: To an aged chromium-plating soln. or a chromate-treatment soln. for Zn-plated articles, the soln. which contains CrO3 as a principal component, is added amonia to neutralize the soln. to a pH about 6W7, hereby, heavy metals, e.g., Fe Zn, Cu, Ni contained in high concn. in the aged soln. are precipitated as hydroxides. CrO3 and S remain dissolved respectively as (NH4)2Cr2O7 are (NH4)2 SO4 in the soln. These heavy metal hydroxides are removed from the soln. by filtration. The residual soln. is heated to be evaporated to dryness, and thermally decomposed to recover (NH4)2Cr2O7 as harmless trivalent Cr2O3. S content is decreased during evaporation to dryness, and removed by washing with water or acid.
COPYRIGHT: (C)1980,JPO&Japio
JP53078525A 1978-06-30 1978-06-30 Method for recovering useful substances from chromic acid aging solution Expired JPS5935842B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP53078525A JPS5935842B2 (en) 1978-06-30 1978-06-30 Method for recovering useful substances from chromic acid aging solution

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP53078525A JPS5935842B2 (en) 1978-06-30 1978-06-30 Method for recovering useful substances from chromic acid aging solution

Publications (2)

Publication Number Publication Date
JPS558402A true JPS558402A (en) 1980-01-22
JPS5935842B2 JPS5935842B2 (en) 1984-08-31

Family

ID=13664331

Family Applications (1)

Application Number Title Priority Date Filing Date
JP53078525A Expired JPS5935842B2 (en) 1978-06-30 1978-06-30 Method for recovering useful substances from chromic acid aging solution

Country Status (1)

Country Link
JP (1) JPS5935842B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6341002U (en) * 1986-08-29 1988-03-17
WO2002036839A1 (en) * 2000-10-30 2002-05-10 Benedict Pisicescu Method and installation of metal retrieving from used chroming solutions

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6341002U (en) * 1986-08-29 1988-03-17
WO2002036839A1 (en) * 2000-10-30 2002-05-10 Benedict Pisicescu Method and installation of metal retrieving from used chroming solutions

Also Published As

Publication number Publication date
JPS5935842B2 (en) 1984-08-31

Similar Documents

Publication Publication Date Title
JPS5795830A (en) Extracting method for molybdenum and vanadium from waste desulfurization catalyst
SE8001720L (en) PROCEDURE FOR CLEANING WASTE WATER DISPOSAL FROM HEAVY METALS
JPS558402A (en) Recovering method for useful substance contained in aged chromic acid solution
FR2413470A1 (en) PROCESS FOR SEPARATING COBALT FROM NICKEL
CA1076019A (en) Process for removing waste water from hardening and galvanizing shops
FR2351177A1 (en) TREATMENT OF WASTE HYDROXIDE SLUDGE FROM NON-FERROUS METALS
DE69710308T2 (en) Disposal of zinc-containing metallurgical residues through continuous electro-wet chemical processing in a basic environment
US3271135A (en) Gold recovery process using an alkali metal hydrosulfite with a water soluble oxygen containing compound
JPS5484802A (en) Masking of coexisting iron ion in froth treatment method
Kyuchoukov et al. Method for the recovery of metals from chloride solutions
JPS5693838A (en) Method of recovering valuable metal from acid leached solution of manganese nodule
JPS5562133A (en) Silver recovering method
JPS53128149A (en) Method of processing waste water from chromium plating
JPS542998A (en) Salt water purifying method
Tels et al. Recuperation of Pure Metal Salts From Mixed Metalhydroxides Sludges
JPS5521508A (en) Recovering method for useful substance from aged solution of chromic acid
JPS5576087A (en) Electroplating method for utilizing dross produced from zinc hot dipping bath as zinc source for electro zinc plating
JPS5544583A (en) Tin-containing sludge treating method
JPS5663000A (en) Chromic acid reduction processing method
JPS5620157A (en) Treatment of waste water from chemical copper plating process
JPS56169737A (en) Method of recovering chromium from chromium-containing sludge
JPS5642588A (en) Production of elastase
Saracco et al. Removal of Copper From Aqueous Solutions Containing Ammonia
JPS5637089A (en) Treating method for water
DE588564C (en) Manufacture of molybdates, alkaline earth metals and magnesium