Recovery of Chromium from Slags Leachates by Electrocoagulation and Solid Product Characterization
Slags produced in the steelmaking industry could be a source of chromium. Slags contain, depending on different types of slags, between 2 to 5 wt.% of Cr. Roasting of slag with NaOH, followed by subsequent leaching can produce leachates which can be efficiently processed using electrocoagulation (EC...
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MDPI AG
2020-11-01
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| Online Access: | https://www.mdpi.com/2075-4701/10/12/1593 |
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| author | Lubomir Pikna Maria Hezelova Agnieszka Morillon David Algermissen Ondrej Milkovic Robert Findorak Martin Cesnek Jaroslav Briancin |
| author_facet | Lubomir Pikna Maria Hezelova Agnieszka Morillon David Algermissen Ondrej Milkovic Robert Findorak Martin Cesnek Jaroslav Briancin |
| author_sort | Lubomir Pikna |
| collection | DOAJ |
| description | Slags produced in the steelmaking industry could be a source of chromium. Slags contain, depending on different types of slags, between 2 to 5 wt.% of Cr. Roasting of slag with NaOH, followed by subsequent leaching can produce leachates which can be efficiently processed using electrocoagulation (EC). This paper provides results from the EC process optimization for Cr(VI) solutions with initial concentration 1000 mg/L of Cr(VI). Influence of pH, current intensity and NaCl concentration on the efficiency of chromium recovery, energy consumption as well as solid product composition is discussed in detail. Optimum of pH = 6 was chosen for EC processing of Cr leachates as well as current intensities of 0.1–0.5 A because of the higher Cr/Fe ratio in solid product compared to higher current intensities. Results of EC processing of four real leachates of electric arc furnace carbon steel slag (EAFC), electric arc furnace stainless steel slag (EAFS), low carbon ferrochrome slag (LC FeCr) and high carbon ferrochrome slag (HC FeCr) were evaluated. Comparison of the results of four real leachate samples is presented. Obtained final solid product was identified as (Fe<sub>0.6</sub> Cr<sub>0.4</sub>)<sub>2</sub>O<sub>3</sub> and with up to 20% of Cr could be used as source of chromium in the ferrochrome production. |
| first_indexed | 2024-03-10T14:29:57Z |
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| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-10T14:29:57Z |
| publishDate | 2020-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Metals |
| spelling | doaj.art-8c51468db02c4e49aa3943b5b505acb22023-11-20T22:41:22ZengMDPI AGMetals2075-47012020-11-011012159310.3390/met10121593Recovery of Chromium from Slags Leachates by Electrocoagulation and Solid Product CharacterizationLubomir Pikna0Maria Hezelova1Agnieszka Morillon2David Algermissen3Ondrej Milkovic4Robert Findorak5Martin Cesnek6Jaroslav Briancin7Faculty of Materials, Metallurgy and Recycling, Technical University of Kosice, Letna 9, 042 00 Kosice, SlovakiaFaculty of Materials, Metallurgy and Recycling, Technical University of Kosice, Letna 9, 042 00 Kosice, SlovakiaFEhS–Institut fürBaustoff-Forschung e. V., 47229 Duisburg, GermanyFEhS–Institut fürBaustoff-Forschung e. V., 47229 Duisburg, GermanyInstitute of Materials Research, Slovak Academy of Sciences, Watsonova 47, 040 01 Kosice, SlovakiaFaculty of Materials, Metallurgy and Recycling, Technical University of Kosice, Letna 9, 042 00 Kosice, SlovakiaFaculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, V Holesovickach 2, 180 00 Prague, Czech RepublicInstitute of Geotechnics, Slovak Academy of Sciences, Watsonova 45, 040 01 Kosice, SlovakiaSlags produced in the steelmaking industry could be a source of chromium. Slags contain, depending on different types of slags, between 2 to 5 wt.% of Cr. Roasting of slag with NaOH, followed by subsequent leaching can produce leachates which can be efficiently processed using electrocoagulation (EC). This paper provides results from the EC process optimization for Cr(VI) solutions with initial concentration 1000 mg/L of Cr(VI). Influence of pH, current intensity and NaCl concentration on the efficiency of chromium recovery, energy consumption as well as solid product composition is discussed in detail. Optimum of pH = 6 was chosen for EC processing of Cr leachates as well as current intensities of 0.1–0.5 A because of the higher Cr/Fe ratio in solid product compared to higher current intensities. Results of EC processing of four real leachates of electric arc furnace carbon steel slag (EAFC), electric arc furnace stainless steel slag (EAFS), low carbon ferrochrome slag (LC FeCr) and high carbon ferrochrome slag (HC FeCr) were evaluated. Comparison of the results of four real leachate samples is presented. Obtained final solid product was identified as (Fe<sub>0.6</sub> Cr<sub>0.4</sub>)<sub>2</sub>O<sub>3</sub> and with up to 20% of Cr could be used as source of chromium in the ferrochrome production.https://www.mdpi.com/2075-4701/10/12/1593chromiumelectrocoagulationmetal recoverysecondary raw materialsleachingslag |
| spellingShingle | Lubomir Pikna Maria Hezelova Agnieszka Morillon David Algermissen Ondrej Milkovic Robert Findorak Martin Cesnek Jaroslav Briancin Recovery of Chromium from Slags Leachates by Electrocoagulation and Solid Product Characterization Metals chromium electrocoagulation metal recovery secondary raw materials leaching slag |
| title | Recovery of Chromium from Slags Leachates by Electrocoagulation and Solid Product Characterization |
| title_full | Recovery of Chromium from Slags Leachates by Electrocoagulation and Solid Product Characterization |
| title_fullStr | Recovery of Chromium from Slags Leachates by Electrocoagulation and Solid Product Characterization |
| title_full_unstemmed | Recovery of Chromium from Slags Leachates by Electrocoagulation and Solid Product Characterization |
| title_short | Recovery of Chromium from Slags Leachates by Electrocoagulation and Solid Product Characterization |
| title_sort | recovery of chromium from slags leachates by electrocoagulation and solid product characterization |
| topic | chromium electrocoagulation metal recovery secondary raw materials leaching slag |
| url | https://www.mdpi.com/2075-4701/10/12/1593 |
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