{"id":6858,"date":"2019-08-22T15:33:27","date_gmt":"2019-08-22T07:33:27","guid":{"rendered":"https:\/\/www.jxscmachine.com\/?post_type=solutions&p=6858"},"modified":"2019-09-25T15:43:33","modified_gmt":"2019-09-25T07:43:33","slug":"processamento-de-aluminio","status":"publish","type":"solutions","link":"https:\/\/www.jxscmachine.com\/pt\/solutions\/aluminum-processing\/","title":{"rendered":"Alum\u00ednio"},"content":{"rendered":"
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\"Alum\u00ednio\"<\/div>\n\t\t<\/figure>\n\t<\/div>\n
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Tipo<\/strong>
\nElemento (Minerais\/res\u00edduos de)<\/p>\n

Classifica\u00e7\u00e3o de minerais<\/strong>
\n\u00d3xido<\/p>\n

F\u00f3rmula qu\u00edmica<\/strong>
\nAl(OH)3 (Gibbsite), \u03b3-AlO(OH) (boemite), \u03b1-AlO(OH) (di\u00e1sporo)<\/p>\n

Faixa<\/strong>
\nBranco (boehmite)<\/p>\n

Dureza de Mohs<\/strong>
\n6,5-7 (di\u00e1sporo), 3,5 (boehmite)<\/p>\n\n\t\t<\/div>\n\t<\/div>\n<\/div><\/div><\/div>

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Sistema de cristais<\/strong>
\nOrtorr\u00f4mbico<\/p>\n

Cor<\/strong>
\nBranco, incolor, castanho-acinzentado p\u00e1lido; amarelado ou avermelhado quando impuro. O min\u00e9rio de bauxite \u00e9 castanho-avermelhado, branco, bronzeado e amarelo-bronzeado.<\/p>\n

Brilho<\/strong>
\nV\u00edtreo, perolado, adamantino<\/p>\n

Fratura<\/strong>
\nConchoidal (di\u00e1spora), Uneven (boehmite)<\/p>\n\n\t\t<\/div>\n\t<\/div>\n<\/div><\/div><\/div><\/div>

<\/div>

Descri\u00e7\u00e3o<\/h2><\/div><\/div>\n\t
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O alum\u00ednio \u00e9 o elemento met\u00e1lico mais abundante na crosta terrestre. O min\u00e9rio de bauxita \u00e9 a principal fonte de alum\u00ednio e cont\u00e9m os minerais de alum\u00ednio gibbsita, boehmita e di\u00e1sporo. Nos Estados Unidos, o alum\u00ednio \u00e9 utilizado em embalagens, transportes e constru\u00e7\u00e3o. Por ser uma mistura de minerais, a bauxita em si \u00e9 uma rocha, n\u00e3o um mineral. A bauxite \u00e9 castanha-avermelhada, branca, bronzeada e amarela. Tem um brilho ba\u00e7o a terroso e pode parecer argila ou terra.<\/p>\n\n\t\t<\/div>\n\t<\/div>\n

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Rela\u00e7\u00e3o com a explora\u00e7\u00e3o mineira<\/h2><\/div><\/div>\n\t
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Como o alum\u00ednio met\u00e1lico reage com a \u00e1gua e o ar para formar \u00f3xidos e hidr\u00f3xidos em p\u00f3, o alum\u00ednio met\u00e1lico nunca \u00e9 encontrado na natureza. Muitos minerais comuns, incluindo os feldspatos, cont\u00eam alum\u00ednio, mas a extra\u00e7\u00e3o do metal da maioria dos minerais \u00e9 muito intensiva em termos energ\u00e9ticos e dispendiosa. Por isso, a bauxite \u00e9 a principal fonte de alum\u00ednio do mundo e fornece 99% de alum\u00ednio met\u00e1lico. \u00c9 tamb\u00e9m utilizada na produ\u00e7\u00e3o de corindo sint\u00e9tico e refract\u00e1rios aluminosos.<\/p>\n

Bauxite \u00e9 o nome de uma mistura de minerais semelhantes que cont\u00eam \u00f3xidos de alum\u00ednio hidratados. Esses minerais s\u00e3o a gibbsita, o di\u00e1sporo e a boehmita. A bauxite forma-se quando a s\u00edlica das rochas que cont\u00eam alum\u00ednio (isto \u00e9, rochas com um elevado teor de feldspato mineral) \u00e9 lavada (lixiviada). Este processo de meteoriza\u00e7\u00e3o ocorre em climas tropicais e subtropicais. Isto significa que muitos pa\u00edses com climas tropicais actuais, ou que j\u00e1 foram tropicais, t\u00eam as maiores reservas de min\u00e9rio de bauxite, como o Brasil, a Jamaica, a Guin\u00e9 e a Austr\u00e1lia.<\/p>\n

Fontes alternativas de alum\u00ednio podem um dia incluir argila de caulim, xistos betuminosos, o mineral anortosita e at\u00e9 mesmo res\u00edduos de carv\u00e3o. No entanto, enquanto as reservas de bauxite continuarem a ser abundantes e os custos de produ\u00e7\u00e3o forem baixos, as tecnologias para transformar estas fontes alternativas em alumina ou alum\u00ednio met\u00e1lico n\u00e3o ir\u00e3o provavelmente progredir para al\u00e9m da fase experimental.<\/p>\n

Extra\u00e7\u00e3o de Bauxite \u00e0 Superf\u00edcie: IMAR 7\u00aa Edi\u00e7\u00e3o
\nAproximadamente 85%-90% da extra\u00e7\u00e3o total de bauxite a n\u00edvel mundial envolve m\u00e9todos de extra\u00e7\u00e3o a c\u00e9u aberto, principalmente na China, Europa Oriental e do Sul e R\u00fassia. Nas opera\u00e7\u00f5es a c\u00e9u aberto, a bauxite \u00e9 normalmente extra\u00edda de estratos com uma espessura t\u00edpica de 4-6 m, sob uma camada de cobertura que pode atingir 10 m de espessura, coberta por uma fina camada de solo superficial com a vegeta\u00e7\u00e3o associada. Nalguns locais de extra\u00e7\u00e3o n\u00e3o metal\u00fargica, a espessura da sobrecarga pode atingir 70 m ou mais.
\nAs opera\u00e7\u00f5es de extra\u00e7\u00e3o mineira de bauxite a c\u00e9u aberto podem utilizar retroescavadoras, escavadoras com rodas de balde, bulldozers, draglines, p\u00e1s el\u00e9ctricas e raspadeiras para a remo\u00e7\u00e3o da sobrecarga do min\u00e9rio. Al\u00e9m disso, as draglines, os carregadores frontais e as p\u00e1s el\u00e9ctricas s\u00e3o normalmente utilizados para escavar e carregar o min\u00e9rio em bruto. O carregamento \u00e9 normalmente efectuado em cami\u00f5es de transporte, ou diretamente em vag\u00f5es ferrovi\u00e1rios ou em sistemas de transporte, para o transporte para instala\u00e7\u00f5es de transforma\u00e7\u00e3o de bauxite ou para reservas.<\/p>\n

Explora\u00e7\u00e3o subterr\u00e2nea de bauxite: IMAR 7\u00aa Edi\u00e7\u00e3o
\nDependendo da natureza da bauxite, as opera\u00e7\u00f5es subterr\u00e2neas utilizam tipicamente um conjunto b\u00e1sico de t\u00e9cnicas de extra\u00e7\u00e3o subterr\u00e2nea padr\u00e3o, que incluem a escava\u00e7\u00e3o em blocos combinada com a contra\u00e7\u00e3o de paradas, a conten\u00e7\u00e3o de subn\u00edveis, o corte de topo, o longwall e os m\u00e9todos de sala e pilar. O afluxo excessivo de \u00e1gua \u00e9 um problema significativo na maioria destas minas, particularmente nos trabalhos desenvolvidos abaixo do len\u00e7ol fre\u00e1tico c\u00e1rsico. Nestes casos, s\u00e3o frequentemente perfurados po\u00e7os de desidrata\u00e7\u00e3o para baixar o n\u00edvel de \u00e1gua ativo no local da mina.<\/p>\n\n\t\t<\/div>\n\t<\/div>\n

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Utiliza\u00e7\u00f5es<\/h2><\/div><\/div>\n\t
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Cerca de 85% de toda a bauxite extra\u00edda a n\u00edvel mundial \u00e9 utilizada para produzir alumina para refina\u00e7\u00e3o em alum\u00ednio met\u00e1lico. Outros 10% produzem alumina que \u00e9 utilizada em produtos qu\u00edmicos, abrasivos e refract\u00e1rios. Os restantes 5% de bauxite s\u00e3o utilizados para fabricar abrasivos, materiais refract\u00e1rios e compostos de alum\u00ednio.<\/p>\n

A leveza, a for\u00e7a e a resist\u00eancia \u00e0 corros\u00e3o do alum\u00ednio s\u00e3o considera\u00e7\u00f5es importantes na sua aplica\u00e7\u00e3o. O alum\u00ednio met\u00e1lico \u00e9 utilizado em transportes, embalagens como latas de bebidas, constru\u00e7\u00e3o civil, aplica\u00e7\u00f5es el\u00e9ctricas e outros produtos.<\/p>\n

O alum\u00ednio, o terceiro elemento mais abundante \u00e0 superf\u00edcie da Terra, \u00e9 aparentemente inofensivo para a vida vegetal e animal.<\/p>\n\n\t\t<\/div>\n\t<\/div>\n

<\/div>

Casos relacionados<\/h2><\/div><\/div><\/div><\/div><\/div><\/div>\n<\/div>","protected":false},"excerpt":{"rendered":"Tipo Elemento (Minerais\/res\u00edduos de) Classifica\u00e7\u00e3o mineral \u00d3xido F\u00f3rmula qu\u00edmica Al(OH)3 (gibbsita), \u03b3-AlO(OH) (boehmite), \u03b1-AlO(OH) (di\u00e1sporo) Riscas Branco (boehmite) Dureza de Mohs 6,5-7 (di\u00e1sporo), 3,5 (boehmite) Sistema cristalino Cor ortorr\u00f4mbica Branco, incolor, castanho acinzentado p\u00e1lido; amarelado ou avermelhado quando impuro. O min\u00e9rio de bauxite \u00e9 castanho-avermelhado, branco, bronzeado e amarelo-bronzeado. Brilho V\u00edtreo, nacarado, adamantino Fratura Conchoidal (di\u00e1spora), irregular (boehmite) ... Continuar a ler Alum\u00ednio<\/span><\/a>","protected":false},"author":1,"featured_media":6859,"parent":0,"menu_order":78,"comment_status":"open","ping_status":"open","template":"","format":"standard","meta":{"_acf_changed":false,"ngg_post_thumbnail":0,"footnotes":""},"class_list":["post-6858","solutions","type-solutions","status-publish","format-standard","has-post-thumbnail","hentry"],"acf":[],"yoast_head":"\nAluminum Processing | Equipment, Process Flow, Cases - JXSC Machine<\/title>\n<meta name=\"description\" content=\"Aluminum processing description from gold geology mineral property to how to extract Aluminum from rock and placer deposit, related Aluminum processing plant flow chart and layout design.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.jxscmachine.com\/pt\/solucoes\/processamento-de-aluminio\/\" \/>\n<meta property=\"og:locale\" content=\"pt_PT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Aluminum Processing | Equipment, Process Flow, Cases - 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