{"id":6620,"date":"2021-04-04T12:32:53","date_gmt":"2021-04-04T12:32:53","guid":{"rendered":"https:\/\/www.aluminaceramicball.com\/?p=6620"},"modified":"2021-04-12T06:48:56","modified_gmt":"2021-04-12T06:48:56","slug":"explicacao-pormenorizada-dos-parametros-do-po-de-alumina","status":"publish","type":"post","link":"https:\/\/www.aluminaceramicball.com\/pt\/explicacao-pormenorizada-dos-parametros-do-po-de-alumina\/","title":{"rendered":"Explica\u00e7\u00e3o pormenorizada dos par\u00e2metros do p\u00f3 de alumina"},"content":{"rendered":"

Atualmente, o mundo p\u00f3 de alumina<\/a> produzidos pelo processo Bayer representam mais de 90% da produ\u00e7\u00e3o total, a maioria dos quais s\u00e3o utilizados para fabricar alum\u00ednio met\u00e1lico, e menos de 10% s\u00e3o utilizados para outros fins.<\/p>\n

P\u00f3 de alumina<\/a> \u00e9 a alumina, s\u00edmbolo qu\u00edmico: Al2O3, peso molecular 102, alumina pura \u00e9 p\u00f3 amorfo branco, comumente conhecido como bauxita, densidade 3.9-4.0g \/ cm3, ponto de fus\u00e3o 2050 \u2103, ponto de ebuli\u00e7\u00e3o 2980 \u2103, insol\u00favel em \u00e1gua, \u00f3xido anfot\u00e9rico, sol\u00favel em \u00e1cido inorg\u00e2nico e solu\u00e7\u00e3o alcalina, existem quatro al\u00f3tropos \u03b2-alumina \u03b4-alumina v-alumina a-alumina, e existem principalmente duas variantes do tipo \u03b1 e do tipo \u03b3, Industrialmente pode ser extra\u00eddo da bauxita.<\/p>\n

Na rede cristalina da alumina do tipo \u03b1, os i\u00f5es de oxig\u00e9nio est\u00e3o densamente compactados em hex\u00e1gonos e o Al3+ est\u00e1 simetricamente distribu\u00eddo no centro de coordena\u00e7\u00e3o octa\u00e9drico rodeado por i\u00f5es de oxig\u00e9nio. A energia da rede \u00e9 grande, pelo que o ponto de fus\u00e3o e o ponto de ebuli\u00e7\u00e3o s\u00e3o elevados. A alumina do tipo \u03b1 \u00e9 insol\u00favel em \u00e1gua e \u00e1cido. Tamb\u00e9m \u00e9 chamada de \u00f3xido de alum\u00ednio na ind\u00fastria. \u00c9 a mat\u00e9ria-prima b\u00e1sica para o fabrico de alum\u00ednio met\u00e1lico. \u00c9 tamb\u00e9m utilizada para fabricar v\u00e1rios tijolos refract\u00e1rios, cadinhos refract\u00e1rios, tubos refract\u00e1rios e instrumentos de teste de alta temperatura; pode tamb\u00e9m ser utilizada como abrasivo, retardador de chama, material de enchimento, etc.; a alumina de alta pureza do tipo \u03b1 \u00e9 tamb\u00e9m a mat\u00e9ria-prima para a produ\u00e7\u00e3o de corindo artificial, rubi artificial e safira; \u00e9 tamb\u00e9m utilizada para a produ\u00e7\u00e3o de circuitos integrados modernos de grande escala.<\/p>\n

A alumina do tipo \u03b3 \u00e9 produzida por desidrata\u00e7\u00e3o do hidr\u00f3xido de alum\u00ednio a uma temperatura baixa de 140-150\u00b0C. \u00c9 tamb\u00e9m designada por alumina activada e cola de alum\u00ednio na ind\u00fastria. Na sua estrutura, os i\u00f5es de oxig\u00e9nio est\u00e3o compactados de forma aproximadamente densa em planos verticais e o Al3+ est\u00e1 irregularmente distribu\u00eddo nos espa\u00e7os octa\u00e9dricos e tetra\u00e9dricos rodeados por i\u00f5es de oxig\u00e9nio. A alumina do tipo \u03b3 \u00e9 insol\u00favel em \u00e1gua, mas pode ser dissolvida em \u00e1cido forte ou solu\u00e7\u00e3o alcalina forte. Quando \u00e9 aquecido a 1200 \u2103, \u00e9 completamente convertido em alumina do tipo \u03b1. A alumina do tipo \u03b3 \u00e9 um material poroso, com uma \u00e1rea de superf\u00edcie interna de at\u00e9 v\u00e1rias centenas de metros quadrados por grama, com alta atividade e forte capacidade de adsor\u00e7\u00e3o. Os produtos industriais s\u00e3o frequentemente part\u00edculas cil\u00edndricas incolores ou ligeiramente cor-de-rosa com boa resist\u00eancia \u00e0 press\u00e3o. \u00c9 comummente utilizado como adsorvente, catalisador e transportador de catalisador na refina\u00e7\u00e3o de petr\u00f3leo e na ind\u00fastria petroqu\u00edmica; \u00e9 utilizado como agente de desacidifica\u00e7\u00e3o para \u00f3leo de transformador e \u00f3leo de turbina na ind\u00fastria; \u00e9 tamb\u00e9m utilizado para an\u00e1lise cromatogr\u00e1fica; em laborat\u00f3rio, \u00e9 um forte dessecante neutro A sua capacidade de secagem n\u00e3o \u00e9 inferior \u00e0 do pent\u00f3xido de f\u00f3sforo. Ap\u00f3s a utiliza\u00e7\u00e3o, pode ser regenerado e reutilizado ap\u00f3s aquecimento a 175\u00b0C durante 6-8h.<\/p>","protected":false},"excerpt":{"rendered":"

At present, the world’s alumina powder produced by Bayer process accounts for more than 90% of the total output, most of which are used to make metal aluminum, and less than 10% are used for other purposes. Alumina powder is alumina, chemical symbol: Al2O3, molecular weight 102, pure alumina is white amorphous powder, commonly known 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