Evaluation of cryolite from pitinga (Amazonas-Brazil) as a source of hydrogen fluoride

Detalhes bibliográficos
Autor(a) principal: Paulino,Jéssica F.
Data de Publicação: 2016
Outros Autores: Neumann,Reiner, Afonso,Júlio C.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Química Nova (Online)
Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422016000400496
Resumo: 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.
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spelling Evaluation of cryolite from pitinga (Amazonas-Brazil) as a source of hydrogen fluoridecryolitehydrogen fluoridesulfuric acidacidic leachingThis 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.Sociedade Brasileira de Química2016-05-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422016000400496Química Nova v.39 n.4 2016reponame:Química Nova (Online)instname:Sociedade Brasileira de Química (SBQ)instacron:SBQ10.5935/0100-4042.20160049info:eu-repo/semantics/openAccessPaulino,Jéssica F.Neumann,ReinerAfonso,Júlio C.eng2016-05-25T00:00:00Zoai:scielo:S0100-40422016000400496Revistahttps://www.scielo.br/j/qn/ONGhttps://old.scielo.br/oai/scielo-oai.phpquimicanova@sbq.org.br1678-70640100-4042opendoar:2016-05-25T00:00Química Nova (Online) - Sociedade Brasileira de Química (SBQ)false
dc.title.none.fl_str_mv Evaluation of cryolite from pitinga (Amazonas-Brazil) as a source of hydrogen fluoride
title Evaluation of cryolite from pitinga (Amazonas-Brazil) as a source of hydrogen fluoride
spellingShingle Evaluation of cryolite from pitinga (Amazonas-Brazil) as a source of hydrogen fluoride
Paulino,Jéssica F.
cryolite
hydrogen fluoride
sulfuric acid
acidic leaching
title_short 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_sort Evaluation of cryolite from pitinga (Amazonas-Brazil) as a source of hydrogen fluoride
author Paulino,Jéssica F.
author_facet Paulino,Jéssica F.
Neumann,Reiner
Afonso,Júlio C.
author_role author
author2 Neumann,Reiner
Afonso,Júlio C.
author2_role author
author
dc.contributor.author.fl_str_mv Paulino,Jéssica F.
Neumann,Reiner
Afonso,Júlio C.
dc.subject.por.fl_str_mv cryolite
hydrogen fluoride
sulfuric acid
acidic leaching
topic cryolite
hydrogen fluoride
sulfuric acid
acidic leaching
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.
publishDate 2016
dc.date.none.fl_str_mv 2016-05-01
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422016000400496
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422016000400496
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 10.5935/0100-4042.20160049
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv text/html
dc.publisher.none.fl_str_mv Sociedade Brasileira de Química
publisher.none.fl_str_mv Sociedade Brasileira de Química
dc.source.none.fl_str_mv Química Nova v.39 n.4 2016
reponame:Química Nova (Online)
instname:Sociedade Brasileira de Química (SBQ)
instacron:SBQ
instname_str Sociedade Brasileira de Química (SBQ)
instacron_str SBQ
institution SBQ
reponame_str Química Nova (Online)
collection Química Nova (Online)
repository.name.fl_str_mv Química Nova (Online) - Sociedade Brasileira de Química (SBQ)
repository.mail.fl_str_mv quimicanova@sbq.org.br
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