{"id":2294,"date":"2020-06-17T09:50:12","date_gmt":"2020-06-17T09:50:12","guid":{"rendered":"http:\/\/alalloycasting.com\/?p=2294"},"modified":"2020-09-15T05:39:54","modified_gmt":"2020-09-15T05:39:54","slug":"aluminium-slag-removal-methods","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/aluminium-slag-removal-methods\/","title":{"rendered":"M\u00e9todos de remo\u00e7\u00e3o de esc\u00f3ria de alum\u00ednio"},"content":{"rendered":"

Existem cinco m\u00e9todos de remo\u00e7\u00e3o de esc\u00f3ria de alum\u00ednio; os princ\u00edpios fundamentais desses cinco m\u00e9todos incluem a escoria\u00e7\u00e3o qu\u00edmica, a diferen\u00e7a de densidade, a escoria\u00e7\u00e3o por flota\u00e7\u00e3o, a dissolu\u00e7\u00e3o por fundente e a filtra\u00e7\u00e3o mec\u00e2nica. AdTech unidade de desgaseifica\u00e7\u00e3o<\/a> e unidades de filtragem<\/a> adotam principalmente os princ\u00edpios de flota\u00e7\u00e3o com forma\u00e7\u00e3o de esc\u00f3ria e filtra\u00e7\u00e3o mec\u00e2nica.<\/p>\n

M\u00e9todos de remo\u00e7\u00e3o de esc\u00f3ria de alum\u00ednio<\/h2>\n

Escoria\u00e7\u00e3o qu\u00edmica<\/strong><\/p>\n

A escoria\u00e7\u00e3o composta baseia-se no uso de \u00f3xidos alcalinos e \u00e1cidos fluxos<\/a>, ou compostos complexos ou complexos formados por \u00f3xidos \u00e1cidos e fundentes alcalinos. Isso ocorre porque existe uma forte for\u00e7a de liga\u00e7\u00e3o entre o \u00f3xido presente no alum\u00ednio l\u00edquido e o fundente. Sob determinadas condi\u00e7\u00f5es de temperatura, eles podem interagir para formar esc\u00f3rias de sal duplo com menor densidade e ponto de fus\u00e3o mais baixo. Al\u00e9m disso, \u00e9 f\u00e1cil separ\u00e1-las dos metais, de modo a remov\u00ea-las da superf\u00edcie do alum\u00ednio.<\/p>\n

A forma\u00e7\u00e3o de esc\u00f3ria composta ocorre principalmente na superf\u00edcie do metal fundido, e essa rea\u00e7\u00e3o tamb\u00e9m se d\u00e1 no ponto de contato entre a esc\u00f3ria e o revestimento. As inclus\u00f5es n\u00e3o met\u00e1licas suspensas no metal fundido, sob o efeito da lei da distribui\u00e7\u00e3o e da diferen\u00e7a de densidade, flutuam continuamente do interior do metal fundido para a esc\u00f3ria superficial, a fim de participar da rea\u00e7\u00e3o de forma\u00e7\u00e3o da esc\u00f3ria.<\/p>\n

\"M\u00e9todos<\/p>\n

Diferen\u00e7a de densidade<\/strong><\/p>\n

Esse m\u00e9todo \u00e9 adequado para ligas com grande diferen\u00e7a de densidade entre o metal fundido e as inclus\u00f5es n\u00e3o met\u00e1licas, bem como para part\u00edculas de inclus\u00e3o de grande tamanho. O m\u00e9todo da diferen\u00e7a de densidade geralmente permite que o metal fundido seja mantido abaixo da temperatura de refino e do fluxo por um determinado per\u00edodo, permitindo que as inclus\u00f5es flutuem ou afundem, para que possam ser removidas. A velocidade de flutua\u00e7\u00e3o ou afundamento das inclus\u00f5es de esc\u00f3ria \u00e9 proporcional \u00e0 diferen\u00e7a de densidade entre ambas, inversamente proporcional \u00e0 viscosidade do metal fundido e proporcional ao quadrado do raio das part\u00edculas de esc\u00f3ria. Quando a temperatura do alum\u00ednio fundido \u00e9 baixa e o n\u00famero de inclus\u00f5es \u00e9 grande, a viscosidade do alum\u00ednio fundido \u00e9 elevada, e o tempo para que a esc\u00f3ria flutue ou afunde \u00e9 longo. Quando a temperatura da liga \u00e9 constante, como a viscosidade do metal fundido e a diferen\u00e7a de densidade entre o metal fundido e a esc\u00f3ria n\u00e3o variam muito, o tamanho e a forma da esc\u00f3ria ter\u00e3o grande influ\u00eancia no tempo de flutua\u00e7\u00e3o ou afundamento.<\/p>\n

Portanto, a diferen\u00e7a de densidade se deve principalmente ao aumento do tamanho da inclus\u00e3o de esc\u00f3ria, a fim de facilitar a separa\u00e7\u00e3o da massa fundida. Durante a fundi\u00e7\u00e3o de alum\u00ednio, quando o raio do A1203 \u00e9 reduzido de 0,1 mm para 0,001 mm, o tempo de repouso necess\u00e1rio aumenta de 5 s para 13,8 h, ou seja, isso dificulta que a esc\u00f3ria flutue ou afunde. As ligas de alum\u00ednio geralmente s\u00e3o deixadas em repouso por 20 a 30 minutos, mas o efeito de remo\u00e7\u00e3o da esc\u00f3ria ainda \u00e9 muito limitado. Esse m\u00e9todo \u00e9 demorado e consome muita energia, al\u00e9m de ser dif\u00edcil remover inclus\u00f5es de esc\u00f3ria finamente dispersas. Geralmente, a uma determinada temperatura de superaquecimento, ap\u00f3s o fluxo ser agitado e se transformar em esc\u00f3ria, ele \u00e9 deixado em repouso por um per\u00edodo de tempo para se obter um certo efeito de remo\u00e7\u00e3o de esc\u00f3ria.<\/p>\n

\"M\u00e9todos<\/p>\n

Princ\u00edpio da flutua\u00e7\u00e3o<\/strong><\/p>\n

O princ\u00edpio da flota\u00e7\u00e3o utiliza uma determinada a\u00e7\u00e3o f\u00edsica e qu\u00edmica entre o fluxo ou g\u00e1s inerte e o \u00f3xido, ou seja, a adsor\u00e7\u00e3o e a dissolu\u00e7\u00e3o parcial, fazendo com que a espuma remova o \u00f3xido. A temperatura de fus\u00e3o da liga de alum\u00ednio \u00e9 baixa, mas o ponto de fus\u00e3o de seu \u00f3xido \u00e9 muito alto. Nesse caso, \u00e9 dif\u00edcil utilizar o m\u00e9todo qu\u00edmico. Portanto, o m\u00e9todo de flota\u00e7\u00e3o \u00e9 mais adequado.
\nQuando a liga de alum\u00ednio \u00e9 refinada com g\u00e1s nitrog\u00eanio, muitas esc\u00f3rias oxidadas flutuam para a superf\u00edcie durante a desidrogena\u00e7\u00e3o. O processo desse tipo de remo\u00e7\u00e3o de esc\u00f3ria por flota\u00e7\u00e3o a g\u00e1s \u00e9 basicamente o mesmo que o da remo\u00e7\u00e3o de esc\u00f3ria por flota\u00e7\u00e3o com fundente. Quando as bolhas passam pelo alum\u00ednio l\u00edquido, as part\u00edculas de \u00f3xido dispersas colidem com as bolhas, s\u00e3o adsorvidas por elas e flutuam at\u00e9 a superf\u00edcie do l\u00edquido \u00e0 medida que as bolhas sobem. Quanto maior o n\u00famero de bolhas e quanto maior o tamanho delas, melhor \u00e9 o efeito de remo\u00e7\u00e3o de esc\u00f3ria. Os gases inertes utilizados s\u00e3o geralmente nitrog\u00eanio e arg\u00f4nio. Tamb\u00e9m s\u00e3o comumente utilizadas ligas de alum\u00ednio como agentes de flota\u00e7\u00e3o, principalmente \u00e0 base de sais de cloreto.<\/p>\n

Dissolu\u00e7\u00e3o do fluxo<\/strong><\/p>\n

Depois que as inclus\u00f5es n\u00e3o met\u00e1licas s\u00e3o dissolvidas no fluxo l\u00edquido, elas podem se separar do metal fundido \u00e0 medida que o fluxo flutua e afunda. A capacidade dos fluxos de dissolver a esc\u00f3ria retida depende de sua estrutura molecular e das propriedades qu\u00edmicas resultantes. Quando a estrutura molecular e as propriedades qu\u00edmicas s\u00e3o semelhantes, eles podem ser misc\u00edveis a uma determinada temperatura. A adi\u00e7\u00e3o de 10% de criolita \u00e0 mistura de quantidades iguais de cloreto de s\u00f3dio e cloreto de pot\u00e1ssio permite dissolver 0,15% de Al\u2082O\u2083. E, \u00e0 medida que a quantidade de criolita aumenta, a solubilidade da alumina no fluxo tamb\u00e9m aumenta.<\/p>\n

Filtragem mec\u00e2nica<\/strong><\/p>\n

Os m\u00e9todos de remo\u00e7\u00e3o de esc\u00f3ria de alum\u00ednio mencionados acima s\u00e3o ineficazes para inclus\u00f5es n\u00e3o met\u00e1licas que apresentam pouca diferen\u00e7a na densidade do metal fundido, tamanho reduzido das part\u00edculas e dispers\u00e3o extremamente elevada. Portanto, quando o metal fundido passa pelo meio filtrante, a filtra\u00e7\u00e3o mec\u00e2nica exerce um efeito de bloqueio mec\u00e2nico sobre as inclus\u00f5es n\u00e3o met\u00e1licas. Al\u00e9m disso, o filtro de espuma cer\u00e2mica<\/a> O meio filtrante tamb\u00e9m exerce um efeito de adsor\u00e7\u00e3o sobre as inclus\u00f5es. Geralmente, quanto menor for a abertura e maior a espessura do meio filtrante, menor ser\u00e1 a vaz\u00e3o do alum\u00ednio l\u00edquido e melhor ser\u00e1 o efeito da filtragem mec\u00e2nica.<\/p>","protected":false},"excerpt":{"rendered":"

There are five aluminium slag removal methods, the main principle of five methods includes chemical slagging, density difference, flotation slagging, flux dissolution, mechanical filtration. AdTech…<\/p>","protected":false},"author":1,"featured_media":4778,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[402,403,404],"class_list":["post-2294","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-aluminium-slag-removal-method","tag-flotation-principle","tag-mechanical-filtration"],"yoast_head":"\nAluminium Slag Removal Methods,Flotation Principle,Mechanical Filtration<\/title>\n<meta name=\"description\" content=\"The principle of aluminium slag removal methods includes chemical, density difference, flotation, flux dissolution, mechanical filtration.\" \/>\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\/aluminium-slag-removal-methods\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" 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