{"id":6032,"date":"2020-10-25T04:28:43","date_gmt":"2020-10-25T04:28:43","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=6032"},"modified":"2020-10-26T03:19:00","modified_gmt":"2020-10-26T03:19:00","slug":"rotary-degassing-machines","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/rotary-degassing-machines\/","title":{"rendered":"M\u00e1quinas rotativas de desgaseifica\u00e7\u00e3o"},"content":{"rendered":"<p>Atualmente, o uso de g\u00e1s N\u2082 e Ar como g\u00e1s transportador, com a adi\u00e7\u00e3o de uma pequena quantidade de agente de refino livre de poluentes, e a utiliza\u00e7\u00e3o de m\u00e1quinas de desgaseifica\u00e7\u00e3o de tubo \u00fanico, porosas ou rotativas para purificar o alum\u00ednio l\u00edquido, constitui uma tecnologia avan\u00e7ada de refino, amplamente utilizada nos pa\u00edses industrializados.<\/p>\n<p>De acordo com a teoria din\u00e2mica, existe uma certa rela\u00e7\u00e3o entre a permeabilidade ao ar, o tamanho dos poros, a frequ\u00eancia das bolhas e a taxa de sopro. Quanto maior for a frequ\u00eancia das bolhas, menores e mais numerosas elas ser\u00e3o, melhor ser\u00e1 o efeito de desidrogena\u00e7\u00e3o; por\u00e9m, ap\u00f3s a frequ\u00eancia cr\u00edtica ser ultrapassada, ocorrer\u00e1 o fen\u00f4meno das bolhas e o efeito de desidrogena\u00e7\u00e3o diminuir\u00e1. As condi\u00e7\u00f5es cin\u00e9ticas de desidrogena\u00e7\u00e3o podem ser resumidas em dois fatores: a taxa de porosidade no alum\u00ednio fundido e a \u00e1rea de contato entre as fases gasosa e l\u00edquida. Quanto maiores forem a taxa de porosidade e a \u00e1rea de contato entre as fases gasosa e l\u00edquida, melhores ser\u00e3o as condi\u00e7\u00f5es cin\u00e9ticas de desidrogena\u00e7\u00e3o.<\/p>\n<p>Atualmente, o mais utilizado <a href=\"http:\/\/www.alalloycasting.com\/pt\/rotary-degassing-equipment\/\">equipamento rotativo de desgaseifica\u00e7\u00e3o<\/a> Entre os m\u00e9todos utilizados na produ\u00e7\u00e3o est\u00e3o a inje\u00e7\u00e3o parcial (N\u2082, Ar, com tubo \u00fanico ou cabe\u00e7a de sopro com m\u00faltiplos orif\u00edcios) e a pulveriza\u00e7\u00e3o com campo de cisalhamento (N\u2082, Ar, com bocal rotativo). De acordo com a teoria bif\u00e1sica g\u00e1s-l\u00edquido, a inje\u00e7\u00e3o local provoca uma grande convec\u00e7\u00e3o circular do alum\u00ednio l\u00edquido para cima e para baixo. A coluna de bolhas forma um cone positivo; o \u00e2ngulo do cone aumenta com o fluxo de g\u00e1s, e o centro da superf\u00edcie do l\u00edquido se projeta, sendo perturbado \u00e0 medida que cada bolha escapa. \u00c9 f\u00e1cil causar a oxida\u00e7\u00e3o do l\u00edquido na suc\u00e7\u00e3o da superf\u00edcie central, e o efeito de purifica\u00e7\u00e3o \u00e9 pior do que o da pulveriza\u00e7\u00e3o rotativa.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-6033\" src=\"http:\/\/alalloycasting.com\/wp-content\/uploads\/2020\/10\/Rotary-Degassing-Machines.jpg\" alt=\"M\u00e1quinas rotativas de desgaseifica\u00e7\u00e3o\" width=\"400\" height=\"500\" srcset=\"https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/10\/Rotary-Degassing-Machines.jpg 400w, https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/10\/Rotary-Degassing-Machines-240x300.jpg 240w\" sizes=\"auto, (max-width: 400px) 100vw, 400px\" \/><\/p>\n<p>O uso de m\u00e1quinas de desgaseifica\u00e7\u00e3o rotativas para o processamento de alum\u00ednio fundido \u00e9, atualmente, a tecnologia patenteada mais avan\u00e7ada do mundo para a purifica\u00e7\u00e3o do alum\u00ednio fundido. O N\u2082 ou o Ar \u00e9 introduzido no alum\u00ednio fundido na forma de bolhas extremamente pequenas por meio de um bocal rotativo de alta velocidade e, gra\u00e7as \u00e0 rota\u00e7\u00e3o em alta velocidade, essas pequenas bolhas ficam altamente dispersas e distribu\u00eddas no alum\u00ednio fundido, a porosidade \u00e9 elevada e a superf\u00edcie de contato g\u00e1s-l\u00edquido \u00e9 ampla; al\u00e9m disso, a grande dispers\u00e3o e a flutua\u00e7\u00e3o das bolhas distribu\u00eddas trazem o hidrog\u00eanio e as inclus\u00f5es para a superf\u00edcie do alum\u00ednio fundido, sem perturbar muito a superf\u00edcie do l\u00edquido e com menor oxida\u00e7\u00e3o e absor\u00e7\u00e3o, de modo que o efeito de purifica\u00e7\u00e3o \u00e9 visivelmente melhorado.<\/p>\n<p>Atualmente, o bocal de grafite da unidade de desgaseifica\u00e7\u00e3o produz bolhas relativamente finas sem girar, a fim de alcan\u00e7ar um melhor efeito de refino. H\u00e1 tamb\u00e9m um cabe\u00e7ote de sopro do inv\u00f3lucro. O alum\u00ednio fundido circula dentro e fora do inv\u00f3lucro de acordo com o princ\u00edpio de uma bomba de eleva\u00e7\u00e3o a g\u00e1s e, em seguida, entra no inv\u00f3lucro para tratamento de desidrogena\u00e7\u00e3o, realizando um movimento rec\u00edproco para alcan\u00e7ar o objetivo de purifica\u00e7\u00e3o por remo\u00e7\u00e3o de hidrog\u00eanio.<\/p>","protected":false},"excerpt":{"rendered":"<p>At present, using N2 and Ar gas as a carrier, adding a small amount of pollution-free refining agent, using a single tube, porous or rotary&hellip;<\/p>","protected":false},"author":1,"featured_media":6033,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[5137,5136,5130,5131,5135,5141,5140,5139,5143,5146,5147,5148,5145,5144,5149,5150,5153,5154,5151,5152,5155,5156,5158,5157,5134,5138,5133,5142,5132],"class_list":["post-6032","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-rotary-degassing-machines-for-aluminium-indonesia","tag-rotary-degassing-machines-for-aluminum-die-casting-indonesia","tag-rotary-degassing-machines-for-aluminum-indonesia","tag-rotary-degassing-machines-for-aluminum-indonesia-jakarta","tag-rotary-degassing-machines-for-aluminum-smelter-indonesia","tag-rotary-degassing-machines-for-daiki-aluminium-indonesia","tag-rotary-degassing-machines-for-hyundai-aluminium-indonesia","tag-rotary-degassing-machines-for-il-sogno-aluminium-indonesia","tag-rotary-degassing-machines-for-indonesia-aluminium","tag-rotary-degassing-machines-for-indonesia-aluminium-foil","tag-rotary-degassing-machines-for-indonesia-aluminium-industry","tag-rotary-degassing-machines-for-indonesia-aluminium-ingot","tag-rotary-degassing-machines-for-indonesia-aluminium-production","tag-rotary-degassing-machines-for-indonesia-aluminium-smelter","tag-rotary-degassing-machines-for-indonesia-aluminum","tag-rotary-degassing-machines-for-indonesia-aluminum-company","tag-rotary-degassing-machines-for-indonesia-aluminum-ingot","tag-rotary-degassing-machines-for-indonesia-aluminum-production","tag-rotary-degassing-machines-for-indonesia-aluminum-smelter","tag-rotary-degassing-machines-for-indonesia-aluminum-supplier","tag-rotary-degassing-machines-for-malaysia-aluminium","tag-rotary-degassing-machines-for-malaysia-aluminium-alloy","tag-rotary-degassing-machines-for-malaysia-aluminium-scrap","tag-rotary-degassing-machines-for-malaysia-aluminium-smelter","tag-rotary-degassing-machines-for-nanshan-aluminum-indonesia","tag-rotary-degassing-machines-for-pt-daiki-aluminium-indonesia","tag-rotary-degassing-machines-for-showa-aluminum-indonesia","tag-rotary-degassing-machines-for-xinfa-aluminium-indonesia","tag-rotary-degassing-machines-for-ykk-aluminum-indonesia"],"yoast_head":"<!-- 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