{"id":790,"date":"2020-04-10T09:14:16","date_gmt":"2020-04-10T09:14:16","guid":{"rendered":"http:\/\/alalloycasting.com\/?p=790"},"modified":"2020-08-26T09:15:19","modified_gmt":"2020-08-26T09:15:19","slug":"alumina-refines","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/alumina-refines\/","title":{"rendered":"Refinarias de alumina"},"content":{"rendered":"

A produ\u00e7\u00e3o mensal de alumina na China aumentou significativamente em mar\u00e7o, segundo revelaram dados de produ\u00e7\u00e3o em primeira m\u00e3o das refinarias chinesas de alumina, coletados pelo Shanghai Metals Market. O volume de produ\u00e7\u00e3o de alumina no m\u00eas passado totalizou 5.831.000 toneladas, um aumento de 27% em rela\u00e7\u00e3o a mar\u00e7o de 2016 e de 12,45% em rela\u00e7\u00e3o a fevereiro deste ano. A produ\u00e7\u00e3o total de alumina em fevereiro foi estimada em 5.185.000 toneladas.<\/p>\n

Refinarias de alumina<\/h2>\n

Durante os tr\u00eas primeiros meses de 2017, ou seja, de janeiro a fevereiro, a China produziu 16.600.000 toneladas de alumina. Esse volume \u00e9 24% superior ao da alumina produzida no mesmo per\u00edodo do ano anterior.<\/p>\n

De acordo com a estimativa da SMM, a produ\u00e7\u00e3o de alumina no mercado interno da China em abril dever\u00e1 cair 2,48% em rela\u00e7\u00e3o ao m\u00eas anterior, ficando em 5.686.000 toneladas.<\/p>\n

A produ\u00e7\u00e3o de alum\u00ednio prim\u00e1rio da China em mar\u00e7o aumentou 23% em rela\u00e7\u00e3o ao ano anterior, totalizando 3.112.000 toneladas. A produ\u00e7\u00e3o acumulada nos primeiros tr\u00eas meses de 2017 foi estimada em 8.988.000 toneladas, um aumento de 22,1% em rela\u00e7\u00e3o ao mesmo per\u00edodo do ano anterior. Estima-se que, em abril, a China produza 3.041.000 toneladas de alum\u00ednio, uma queda de 2,28% em rela\u00e7\u00e3o ao m\u00eas anterior.<\/p>\n

\"Refinarias<\/p>\n

A purifica\u00e7\u00e3o eletrol\u00edtica \u00e9 realizada, preferencialmente, na forma do conhecido processo de eletr\u00f3lito de tr\u00eas camadas, que vem sendo empregado pela ind\u00fastria do alum\u00ednio h\u00e1 muito tempo, ou por meio da c\u00e9lula eletrol\u00edtica bipolar descrita no pedido de patente dos EUA n\u00ba 630.289. Uma c\u00e9lula bipolar \u00e9 empregada, em particular, se o sucata de alum\u00ednio<\/a> possui uma alta concentra\u00e7\u00e3o de sil\u00edcio e\/ou ferro, j\u00e1 que assim \u00e9 poss\u00edvel evitar as grandes perdas de cobre que ocorrem no processo de tr\u00eas camadas.<\/p>\n

A quantidade de sal necess\u00e1ria para a realiza\u00e7\u00e3o do processo de acordo com a inven\u00e7\u00e3o \u00e9 calculada de modo a que seja, preferencialmente, 1,2 a 2 vezes, em particular 1,5 vezes, maior que o peso da sucata a ser purificada. As cargas de sais empregadas compreendem, de maneira \u00fatil, 30 a 50 % em peso de NaCl, 30 a 50 % em peso de KCl e 15 a 25 % em peso de criolita. Uma massa fundida que se mostrou particularmente vantajosa cont\u00e9m cerca de 40% em peso de NaCl, 40% em peso de KCl e 20% em peso de criolita, sendo essa massa mantida a uma temperatura de cerca de 750 \u00b0C antes da adi\u00e7\u00e3o da sucata de alum\u00ednio pr\u00e9-aquecida. Especialmente quando a sucata est\u00e1 em peda\u00e7os pequenos, pode ser vantajoso, antes da manuten\u00e7\u00e3o da temperatura, agitar a mistura fundida de sais e sucata de alum\u00ednio. O principal efeito disso \u00e9 reduzir a concentra\u00e7\u00e3o de magn\u00e9sio na sucata de alum\u00ednio. A agita\u00e7\u00e3o \u00e9 realizada por meios mec\u00e2nicos conhecidos, por exemplo, utilizando um agitador magn\u00e9tico ou por inje\u00e7\u00e3o de gases inertes.<\/p>\n

A a\u00e7\u00e3o purificadora da solu\u00e7\u00e3o salina derretida pode ser aumentada mediante o uso de um g\u00e1s de lavagem convencional, como o cloro, antes da reten\u00e7\u00e3o.<\/p>\n

Durante a reten\u00e7\u00e3o, que dura preferencialmente de 1 a 2 horas, as got\u00edculas de alum\u00ednio sedimentam-se no fundo do recipiente de reten\u00e7\u00e3o, fun\u00e7\u00e3o para a qual o forno de fus\u00e3o tamb\u00e9m serve de maneira \u00fatil.<\/p>","protected":false},"excerpt":{"rendered":"

Monthly alumina output in China rose significantly in March, revealed first-hand production data of the Chinese alumina refines factory as surveyed by the Shanghai Metals…<\/p>","protected":false},"author":1,"featured_media":1904,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[142],"class_list":["post-790","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-alumina-refines"],"yoast_head":"\nAlumina Refines | Aluminum Casting Foundry Flux<\/title>\n<meta name=\"description\" content=\"Monthly alumina output in China rose significantly, revealed production data of the Chinese alumina refines as surveyed by the Metals Market.\" \/>\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.alalloycasting.com\/pt\/alumina-refines\/\" 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