Process for treatment of sulfuric acid pickling waste liquor for pickling steel

The process for treatment of waste pickle liquor from pickling steel with sulfuric acid is characterized by that the concentrated sulfuric acid is added in waste pickle liquor so as to raise its degree of acidity, then frozen to crystallize ferrous sulfate, and filtered, the ferrous sulfate as by-pr...

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Bibliographische Detailangaben
Hauptverfasser:	TIANMIN FAN, FENGQUN SANG, JICHANG SUN
Format:	Patent
Sprache:	eng
Schlagworte:	CHEMICAL SURFACE TREATMENT CHEMISTRY CLEANING OR DEGREASING OF METALLIC MATERIAL BY CHEMICALMETHODS OTHER THAN ELECTROLYSIS COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING MATERIAL WITH METALLIC MATERIAL COATING METALLIC MATERIAL DIFFUSION TREATMENT OF METALLIC MATERIAL INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL METALLURGY
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Beschreibung
Zusammenfassung:	The process for treatment of waste pickle liquor from pickling steel with sulfuric acid is characterized by that the concentrated sulfuric acid is added in waste pickle liquor so as to raise its degree of acidity, then frozen to crystallize ferrous sulfate, and filtered, the ferrous sulfate as by-product of excellent grade can be obtained. Its mother liquor can be used as regenerated acid, and returned into pickling tank, and can be reused. The ferrous sulfate can be used as raw material for producing iron oxide red and iron oxide yellow. In its mother liquor, the acid content is 15-20%, and ferrous sulfate content is 60-90g/l. Said invented process can make utilization rate of sulfuric acid for pickling steel reach 100%, and has no discharge of waste liquor.