Evaluation of cryolite from pitinga (Amazonas-Brazil) as a source of hydrogen fluoride
This paper reports the use of cryolite from the Pitinga Mine (Amazonas state, Brazil) as raw material in hydrogen fluoride production. Samples were initially characterized by chemical and mineralogical analyses. They presented low silica content (< 4 wt.%). After milling, cryolite samples were di...
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| Format: | Article |
| Language: | English |
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Sociedade Brasileira de Química
2016-05-01
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| Series: | Química Nova |
| Subjects: | |
| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422016000400496&lng=en&tlng=en |
| _version_ | 1818290246093111296 |
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| author | Jéssica F. Paulino Reiner Neumann Júlio C. Afonso |
| author_facet | Jéssica F. Paulino Reiner Neumann Júlio C. Afonso |
| author_sort | Jéssica F. Paulino |
| collection | DOAJ |
| description | This paper reports the use of cryolite from the Pitinga Mine (Amazonas state, Brazil) as raw material in hydrogen fluoride production. Samples were initially characterized by chemical and mineralogical analyses. They presented low silica content (< 4 wt.%). After milling, cryolite samples were digested with concentrated sulfuric acid under stirring (200 rpm) and variable temperature, time and liquid to solid ratio conditions. Under the best experimental conditions (140 °C, 3-5 h), 96 wt.% of fluorine was recovered as hydrogen fluoride. The application of a 23 full factorial design showed that temperature and reaction time were relevant parameters during leaching, whereas liquid to solid ratio was not statistically significant. |
| first_indexed | 2024-12-13T02:25:07Z |
| format | Article |
| id | doaj.art-4dce12163d1449baacd347878a9788b7 |
| institution | Directory Open Access Journal |
| issn | 1678-7064 |
| language | English |
| last_indexed | 2024-12-13T02:25:07Z |
| publishDate | 2016-05-01 |
| publisher | Sociedade Brasileira de Química |
| record_format | Article |
| series | Química Nova |
| spelling | doaj.art-4dce12163d1449baacd347878a9788b72022-12-22T00:02:40ZengSociedade Brasileira de QuímicaQuímica Nova1678-70642016-05-0139449650110.5935/0100-4042.20160049S0100-40422016000400496Evaluation of cryolite from pitinga (Amazonas-Brazil) as a source of hydrogen fluorideJéssica F. PaulinoReiner NeumannJúlio C. AfonsoThis paper reports the use of cryolite from the Pitinga Mine (Amazonas state, Brazil) as raw material in hydrogen fluoride production. Samples were initially characterized by chemical and mineralogical analyses. They presented low silica content (< 4 wt.%). After milling, cryolite samples were digested with concentrated sulfuric acid under stirring (200 rpm) and variable temperature, time and liquid to solid ratio conditions. Under the best experimental conditions (140 °C, 3-5 h), 96 wt.% of fluorine was recovered as hydrogen fluoride. The application of a 23 full factorial design showed that temperature and reaction time were relevant parameters during leaching, whereas liquid to solid ratio was not statistically significant.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422016000400496&lng=en&tlng=encryolitehydrogen fluoridesulfuric acidacidic leaching |
| spellingShingle | Jéssica F. Paulino Reiner Neumann Júlio C. Afonso Evaluation of cryolite from pitinga (Amazonas-Brazil) as a source of hydrogen fluoride Química Nova cryolite hydrogen fluoride sulfuric acid acidic leaching |
| title | Evaluation of cryolite from pitinga (Amazonas-Brazil) as a source of hydrogen fluoride |
| title_full | Evaluation of cryolite from pitinga (Amazonas-Brazil) as a source of hydrogen fluoride |
| title_fullStr | Evaluation of cryolite from pitinga (Amazonas-Brazil) as a source of hydrogen fluoride |
| title_full_unstemmed | Evaluation of cryolite from pitinga (Amazonas-Brazil) as a source of hydrogen fluoride |
| title_short | Evaluation of cryolite from pitinga (Amazonas-Brazil) as a source of hydrogen fluoride |
| title_sort | evaluation of cryolite from pitinga amazonas brazil as a source of hydrogen fluoride |
| topic | cryolite hydrogen fluoride sulfuric acid acidic leaching |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422016000400496&lng=en&tlng=en |
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