RECOVERING DISSOLVED METAL FROM WASTE PRODUCED WHEN MANUFACTURING PHTHALOCYANINE PIGMENTS, ETC. BY ADDING STRONG ACID, ADDING COMPLEX TO PRECIPITATE METAL AND FILTERING OFF PRECIPITATE

PURPOSE: A method for recovering dissolved metals in wastewater effluent from synthesization process of phthalocyanine pigments is provided. CONSTITUTION: Metal dissolved in acidic and/or basic waste from an organic chemical process is recovered by adding a strong acid to adjust and maintain its pH...

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Bibliographic Details
Main Authors COISPEAU GERARD, NAHON KAREN
Format Patent
LanguageEnglish
Korean
Published 15.06.2001
Edition7
Subjects
ADHESIVES
CHEMISTRY
DYES
LAKES
METALLURGY
MISCELLANEOUS APPLICATIONS OF MATERIALS
MISCELLANEOUS COMPOSITIONS
MORDANTS
NATURAL RESINS
ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES
PAINTS
PERFORMING OPERATIONS
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
POLISHES
SEPARATION
TRANSPORTING
TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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Summary:PURPOSE: A method for recovering dissolved metals in wastewater effluent from synthesization process of phthalocyanine pigments is provided. CONSTITUTION: Metal dissolved in acidic and/or basic waste from an organic chemical process is recovered by adding a strong acid to adjust and maintain its pH to 0-4. Then a complex is added to precipitate the metal and this is allowed to settle. The solution is filtered to produce an acid sludge including the metal and a filtrate with a reduced metal content. Preferably sulfuric acid is added to reduce the pH to 3 and sodium dimethyl dithiocarbamate is added to precipitate the metal. Then a potential ranging from 150 to 300mV is applied via a silver/silver chloride electrode. Ferric chloride in the solution assists settling of the precipitate before it is separated using a filter press. The metal recovered is iron, cobalt, nickel or copper.
Bibliography:Application Number: KR20000023976