Acid pickling of carbon steel
This study reviews the possibilities of recovering the pickling waters from carbon and galvanised steel. Acid pickling with hydrochloric acid (HCl) is the most widely used chemical process to remove iron oxides from the metal surface without any significant attack on the steel itself. The acid pick...
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| Format: | Article |
| Language: | English |
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Consejo Superior de Investigaciones Científicas
2022-11-01
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| Series: | Revista de Metalurgia |
| Subjects: | |
| Online Access: | https://revistademetalurgia.revistas.csic.es/index.php/revistademetalurgia/article/view/1546 |
| _version_ | 1828085952209223680 |
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| author | Arkaiz Anderez Francisco J. Alguacil Félix A. López |
| author_facet | Arkaiz Anderez Francisco J. Alguacil Félix A. López |
| author_sort | Arkaiz Anderez |
| collection | DOAJ |
| description |
This study reviews the possibilities of recovering the pickling waters from carbon and galvanised steel. Acid pickling with hydrochloric acid (HCl) is the most widely used chemical process to remove iron oxides from the metal surface without any significant attack on the steel itself. The acid pickling bath contains mainly ferrous chloride (FeCl2) produced by the reaction between the steel and free hydrochloric acid. However, zinc chloride (ZnCl2) is also found in the pickling of carbon steel parts prior to galvanisation, as the hooks and tools used to hang the carbon steel parts are also galvanised and reuse again polluting with Zn the pickling waters. Pickling water recovery or recycling technologies primarily seek the reuse of HCl in two ways. Partially by recovering the unreacted HCl or fully by breaking the FeCl2 bond through Pyrolysis technologies such as fluidised bed and spray roasting which in turn produces another iron oxide by-product. However, the most common by-product produced by pickling water recovery and recycling technologies is ferric chloride (FeCl3), as it is a coagulant widely used in wastewater treatment. However, if the pickling water contains ZnCl2 or other metals, the production of FeCl3 becomes unattractive and the pickling water is neutralised and deposited in landfill sites. This study also discusses a wide range of technologies capable of recovering all or part of the pickling water, including galvanic pickling water, that are usually excluded from circular economy strategies.
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| first_indexed | 2024-04-11T04:48:02Z |
| format | Article |
| id | doaj.art-aa966060c9dd4832bfd5938698e0a79c |
| institution | Directory Open Access Journal |
| issn | 0034-8570 1988-4222 |
| language | English |
| last_indexed | 2024-04-11T04:48:02Z |
| publishDate | 2022-11-01 |
| publisher | Consejo Superior de Investigaciones Científicas |
| record_format | Article |
| series | Revista de Metalurgia |
| spelling | doaj.art-aa966060c9dd4832bfd5938698e0a79c2022-12-27T09:04:29ZengConsejo Superior de Investigaciones CientíficasRevista de Metalurgia0034-85701988-42222022-11-0158310.3989/revmetalm.226Acid pickling of carbon steelArkaiz Anderez0Francisco J. Alguacil1Félix A. López2Gonvarri Industries - Centro Nacional de Investigaciones Metalúrgicas (CENIM-CSIC)Centro Nacional de Investigaciones Metalúrgicas (CENIM-CSIC)Centro Nacional de Investigaciones Metalúrgicas (CENIM-CSIC) This study reviews the possibilities of recovering the pickling waters from carbon and galvanised steel. Acid pickling with hydrochloric acid (HCl) is the most widely used chemical process to remove iron oxides from the metal surface without any significant attack on the steel itself. The acid pickling bath contains mainly ferrous chloride (FeCl2) produced by the reaction between the steel and free hydrochloric acid. However, zinc chloride (ZnCl2) is also found in the pickling of carbon steel parts prior to galvanisation, as the hooks and tools used to hang the carbon steel parts are also galvanised and reuse again polluting with Zn the pickling waters. Pickling water recovery or recycling technologies primarily seek the reuse of HCl in two ways. Partially by recovering the unreacted HCl or fully by breaking the FeCl2 bond through Pyrolysis technologies such as fluidised bed and spray roasting which in turn produces another iron oxide by-product. However, the most common by-product produced by pickling water recovery and recycling technologies is ferric chloride (FeCl3), as it is a coagulant widely used in wastewater treatment. However, if the pickling water contains ZnCl2 or other metals, the production of FeCl3 becomes unattractive and the pickling water is neutralised and deposited in landfill sites. This study also discusses a wide range of technologies capable of recovering all or part of the pickling water, including galvanic pickling water, that are usually excluded from circular economy strategies. https://revistademetalurgia.revistas.csic.es/index.php/revistademetalurgia/article/view/1546Hot dip galvanizingHydrochloric acidIron (II) chlorideSteel picklingZinc chloride |
| spellingShingle | Arkaiz Anderez Francisco J. Alguacil Félix A. López Acid pickling of carbon steel Revista de Metalurgia Hot dip galvanizing Hydrochloric acid Iron (II) chloride Steel pickling Zinc chloride |
| title | Acid pickling of carbon steel |
| title_full | Acid pickling of carbon steel |
| title_fullStr | Acid pickling of carbon steel |
| title_full_unstemmed | Acid pickling of carbon steel |
| title_short | Acid pickling of carbon steel |
| title_sort | acid pickling of carbon steel |
| topic | Hot dip galvanizing Hydrochloric acid Iron (II) chloride Steel pickling Zinc chloride |
| url | https://revistademetalurgia.revistas.csic.es/index.php/revistademetalurgia/article/view/1546 |
| work_keys_str_mv | AT arkaizanderez acidpicklingofcarbonsteel AT franciscojalguacil acidpicklingofcarbonsteel AT felixalopez acidpicklingofcarbonsteel |