Reduction of Fe2O3 content of foyaite by flotation and magnetic separation for ceramics production
Feldspars are used as a fluxing agent in ceramics and glass production. However, the presence of iron-bearing minerals reduces whiteness of the ceramics. The objective of this work was to decrease the Fe2O3 content of a foyaite to <1% by flotation and magnetic separation, individually or combined...
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| Format: | Article |
| Language: | English |
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Elsevier
2019-09-01
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| Series: | Journal of Materials Research and Technology |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S223878541831038X |
| _version_ | 1818260160370442240 |
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| author | Juliana Costa Silva Carina Ulsen Maurício Guimarães Bergerman Daniela Gomes Horta |
| author_facet | Juliana Costa Silva Carina Ulsen Maurício Guimarães Bergerman Daniela Gomes Horta |
| author_sort | Juliana Costa Silva |
| collection | DOAJ |
| description | Feldspars are used as a fluxing agent in ceramics and glass production. However, the presence of iron-bearing minerals reduces whiteness of the ceramics. The objective of this work was to decrease the Fe2O3 content of a foyaite to <1% by flotation and magnetic separation, individually or combined, to make the sample suitable for white ceramics manufacture. The sample was prepared regarding its particle size distribution, characterised, and submitted to concentration experiments. Flotation was arried out to investigate promising anionic collectors and the most suitable conditions of dosage and pH. Wet magnetic separation was used in several stages, increasing the magnetic field. Lastly, magnetic separation was applied to the concentrate of the most efficient flotation test. Technological characterisation showed that the foyaite sample displays 3.2% Fe2O3 from pyroxene/amphibole. The most efficient flotation condition was the reverse flotation of iron-bearing minerals with alkyl sulphate as collector under 400 g t−1 at pH 4. The desired specification was reached after three cleaner stages, yielding a concentrate with 0.92% Fe2O3 and 74.6 wt.% recovery. By magnetic separation, the Fe2O3 content was reduced to 0.8% with 70.6 wt.% recovery, after five stages of concentration with the magnetic field varying from 0.78 to 1.12 T. The most efficient combined circuit comprised three stages of flotation followed by one stage of magnetic separation at 0.78 T. The concentrate presented 0.55% Fe2O3 and 71.2 wt.% recovery. Keywords: Flotation, Foyaite, Magnetic separation, White ceramic |
| first_indexed | 2024-12-12T18:26:55Z |
| format | Article |
| id | doaj.art-c270788fb25f4af08970df720ae040a1 |
| institution | Directory Open Access Journal |
| issn | 2238-7854 |
| language | English |
| last_indexed | 2024-12-12T18:26:55Z |
| publishDate | 2019-09-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj.art-c270788fb25f4af08970df720ae040a12022-12-22T00:16:00ZengElsevierJournal of Materials Research and Technology2238-78542019-09-018549154923Reduction of Fe2O3 content of foyaite by flotation and magnetic separation for ceramics productionJuliana Costa Silva0Carina Ulsen1Maurício Guimarães Bergerman2Daniela Gomes Horta3Federal University of Alfenas, Department of Mining Engineering, Rod. José Aurélio Vilela, 11999, BR 267 km 533, 37715-400, Poços de Caldas, Minas Gerais State, BrazilUniversity of São Paulo, Department of Mining and Petroleum Engineering, Technological Characterization Laboratory (LCT-USP), Av. Prof. Mello Moraes, 2373 — Cidade Universitária, CEP 05508-030, São Paulo, SP, BrazilUniversity of São Paulo, Department of Mining and Petroleum Engineering, Laboratory of Mineral Processing (LTM-USP), Av. Prof. Mello Moraes, 2373 — Cidade Universitária, CEP 05508-030, São Paulo, SP, BrazilFederal University of Alfenas, Department of Mining Engineering, Rod. José Aurélio Vilela, 11999, BR 267 km 533, 37715-400, Poços de Caldas, Minas Gerais State, Brazil; Corresponding author.Feldspars are used as a fluxing agent in ceramics and glass production. However, the presence of iron-bearing minerals reduces whiteness of the ceramics. The objective of this work was to decrease the Fe2O3 content of a foyaite to <1% by flotation and magnetic separation, individually or combined, to make the sample suitable for white ceramics manufacture. The sample was prepared regarding its particle size distribution, characterised, and submitted to concentration experiments. Flotation was arried out to investigate promising anionic collectors and the most suitable conditions of dosage and pH. Wet magnetic separation was used in several stages, increasing the magnetic field. Lastly, magnetic separation was applied to the concentrate of the most efficient flotation test. Technological characterisation showed that the foyaite sample displays 3.2% Fe2O3 from pyroxene/amphibole. The most efficient flotation condition was the reverse flotation of iron-bearing minerals with alkyl sulphate as collector under 400 g t−1 at pH 4. The desired specification was reached after three cleaner stages, yielding a concentrate with 0.92% Fe2O3 and 74.6 wt.% recovery. By magnetic separation, the Fe2O3 content was reduced to 0.8% with 70.6 wt.% recovery, after five stages of concentration with the magnetic field varying from 0.78 to 1.12 T. The most efficient combined circuit comprised three stages of flotation followed by one stage of magnetic separation at 0.78 T. The concentrate presented 0.55% Fe2O3 and 71.2 wt.% recovery. Keywords: Flotation, Foyaite, Magnetic separation, White ceramichttp://www.sciencedirect.com/science/article/pii/S223878541831038X |
| spellingShingle | Juliana Costa Silva Carina Ulsen Maurício Guimarães Bergerman Daniela Gomes Horta Reduction of Fe2O3 content of foyaite by flotation and magnetic separation for ceramics production Journal of Materials Research and Technology |
| title | Reduction of Fe2O3 content of foyaite by flotation and magnetic separation for ceramics production |
| title_full | Reduction of Fe2O3 content of foyaite by flotation and magnetic separation for ceramics production |
| title_fullStr | Reduction of Fe2O3 content of foyaite by flotation and magnetic separation for ceramics production |
| title_full_unstemmed | Reduction of Fe2O3 content of foyaite by flotation and magnetic separation for ceramics production |
| title_short | Reduction of Fe2O3 content of foyaite by flotation and magnetic separation for ceramics production |
| title_sort | reduction of fe2o3 content of foyaite by flotation and magnetic separation for ceramics production |
| url | http://www.sciencedirect.com/science/article/pii/S223878541831038X |
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