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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| creator | TIANMIN FAN FENGQUN SANG JICHANG SUN |
| description | 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. |
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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.</description><edition>6</edition><language>eng</language><subject>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</subject><creationdate>1997</creationdate><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&date=19971112&DB=EPODOC&CC=CN&NR=1164579A$$EHTML$$P50$$Gepo$$Hfree_for_read</linktohtml><link.rule.ids>230,308,780,885,25564,76547</link.rule.ids><linktorsrc>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&date=19971112&DB=EPODOC&CC=CN&NR=1164579A$$EView_record_in_European_Patent_Office$$FView_record_in_$$GEuropean_Patent_Office$$Hfree_for_read</linktorsrc></links><search><creatorcontrib>TIANMIN FAN</creatorcontrib><creatorcontrib>FENGQUN SANG</creatorcontrib><creatorcontrib>JICHANG SUN</creatorcontrib><title>Process for treatment of sulfuric acid pickling waste liquor for pickling steel</title><description>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. 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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.</abstract><edition>6</edition><oa>free_for_read</oa></addata></record> |
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| subjects | 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 |
| title | Process for treatment of sulfuric acid pickling waste liquor for pickling steel |
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