{"id":5839,"date":"2020-10-20T09:08:46","date_gmt":"2020-10-20T09:08:46","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=5839"},"modified":"2020-10-26T03:42:31","modified_gmt":"2020-10-26T03:42:31","slug":"porous-filter-medium","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/porous-filter-medium\/","title":{"rendered":"Meio filtrante poroso"},"content":{"rendered":"

A filtra\u00e7\u00e3o \u00e9 um processo de separa\u00e7\u00e3o s\u00f3lido-l\u00edquido que utiliza um meio filtrante poroso para reter as part\u00edculas s\u00f3lidas presentes na suspens\u00e3o e permitir a passagem do l\u00edquido. Em compara\u00e7\u00e3o com o m\u00e9todo de sedimenta\u00e7\u00e3o por gravidade, a opera\u00e7\u00e3o de filtra\u00e7\u00e3o n\u00e3o s\u00f3 apresenta uma velocidade r\u00e1pida de separa\u00e7\u00e3o s\u00f3lido-l\u00edquido, mas tamb\u00e9m uma separa\u00e7\u00e3o mais completa, o que permite obter um bolo de filtra\u00e7\u00e3o e um l\u00edquido l\u00edmpido com menor teor de l\u00edquido. Portanto, a filtra\u00e7\u00e3o \u00e9 um m\u00e9todo universal e eficaz de separa\u00e7\u00e3o s\u00f3lido-l\u00edquido. Geralmente, a suspens\u00e3o enviada para filtra\u00e7\u00e3o \u00e9 chamada de pasta de filtra\u00e7\u00e3o, o meio poroso que ret\u00e9m as part\u00edculas s\u00f3lidas \u00e9 chamado de meio filtrante e a camada de sedimento retida no meio filtrante \u00e9 chamada de bolo de filtra\u00e7\u00e3o ou res\u00edduo de filtra\u00e7\u00e3o. A solu\u00e7\u00e3o l\u00edmpida \u00e9 chamada de filtrado.<\/p>\n

Diferente meio filtrante<\/a> pode ser utilizado de acordo com a natureza da pasta de filtra\u00e7\u00e3o e o tamanho das part\u00edculas s\u00f3lidas. Quando a pasta de filtra\u00e7\u00e3o passa pelo meio filtrante, as part\u00edculas s\u00f3lidas s\u00e3o retidas, formando uma camada de sedimento. O filtrado costuma estar turvo no in\u00edcio da filtra\u00e7\u00e3o e precisa ser devolvido ao filtro. Ap\u00f3s a forma\u00e7\u00e3o da camada de sedimentos, a filtra\u00e7\u00e3o pode ser realizada de forma eficaz. Durante o processo de filtra\u00e7\u00e3o, a espessura do bolo de filtra\u00e7\u00e3o continua a aumentar, a resist\u00eancia do bolo de filtra\u00e7\u00e3o ao fluido tamb\u00e9m continua a aumentar e a taxa de filtra\u00e7\u00e3o continua a diminuir. Portanto, a resist\u00eancia do meio filtrante ao fluido costuma ser menor do que a resist\u00eancia do bolo de filtra\u00e7\u00e3o, e a taxa de filtra\u00e7\u00e3o \u00e9 determinada principalmente pela espessura do bolo de filtra\u00e7\u00e3o e por suas caracter\u00edsticas (principalmente a porosidade do bolo de filtra\u00e7\u00e3o). A porosidade do bolo de filtra\u00e7\u00e3o est\u00e1 relacionada \u00e0 forma das part\u00edculas s\u00f3lidas, \u00e0 distribui\u00e7\u00e3o granulom\u00e9trica, \u00e0 rugosidade da superf\u00edcie das part\u00edculas e aos m\u00e9todos de preenchimento das part\u00edculas.<\/p>\n

\"Meio<\/p>\n

De acordo com as caracter\u00edsticas do bolo de filtra\u00e7\u00e3o, ele pode ser dividido em bolo de filtra\u00e7\u00e3o compress\u00edvel e bolo de filtra\u00e7\u00e3o incompress\u00edvel. O bolo de filtra\u00e7\u00e3o incompress\u00edvel \u00e9 composto principalmente por part\u00edculas minerais e precipitados cristalinos, e a resist\u00eancia ao fluido \u00e9 menos afetada pela diferen\u00e7a de press\u00e3o nos dois lados do bolo de filtra\u00e7\u00e3o e pela taxa de deposi\u00e7\u00e3o de part\u00edculas. O bolo de filtra\u00e7\u00e3o compress\u00edvel \u00e9 composto por sedimentos amorfos, e sua resist\u00eancia ao fluxo aumenta com o aumento da diferen\u00e7a de press\u00e3o entre os dois lados do bolo de filtra\u00e7\u00e3o e da taxa de deposi\u00e7\u00e3o do material.<\/p>\n

O meio filtrante costuma servir de suporte para o bolo de filtra\u00e7\u00e3o, e \u00e9 a camada do bolo de filtra\u00e7\u00e3o que desempenha a fun\u00e7\u00e3o real de filtragem. O meio filtrante deve possuir resist\u00eancia mec\u00e2nica suficiente, resist\u00eancia \u00e0 corros\u00e3o, bom desempenho e baixa resist\u00eancia ao fluido.<\/p>\n

Existem tr\u00eas tipos de meios filtrantes comumente utilizados:<\/p>\n

(1) Os meios granulares incluem cascalho, areia, esc\u00f3ria de vidro, carv\u00e3o vegetal e terra diatom\u00e1cea, entre outros. Esses meios possuem part\u00edculas duras e podem ser dispostos em camadas para tratar suspens\u00f5es com s\u00f3lidos de tamanho reduzido.
\n(2) Meios filtrantes de tecido: O tecido filtrante pode ser tecido com fios met\u00e1licos e n\u00e3o met\u00e1licos. Os materiais met\u00e1licos comumente utilizados incluem a\u00e7o inoxid\u00e1vel, lat\u00e3o, liga Montessori etc., e os materiais n\u00e3o met\u00e1licos incluem l\u00e3, algod\u00e3o, linho, n\u00e1ilon, pl\u00e1stico, vidro etc. A sele\u00e7\u00e3o do material do tecido filtrante deve levar em considera\u00e7\u00e3o, principalmente, fatores como a corrosividade do l\u00edquido, a temperatura de opera\u00e7\u00e3o das part\u00edculas s\u00f3lidas e a resist\u00eancia ao desgaste.
\n(3) Meios s\u00f3lidos porosos: s\u00e3o comumente utilizados cer\u00e2micas porosas, vidro poroso, metais porosos, pl\u00e1sticos porosos etc., frequentemente fabricados na forma de placas ou tubos. Esse tipo de meio apresenta poros de tamanho reduzido, alta resist\u00eancia mec\u00e2nica e resist\u00eancia \u00e0 corros\u00e3o por \u00e1cidos, \u00e1lcalis, sais e solventes org\u00e2nicos. \u00c9 adequado para a filtragem de materiais que cont\u00eam part\u00edculas finas. A desvantagem \u00e9 que os microporos se obstruem facilmente e precisam ser regenerados regularmente (por retrolavagem ou quimicamente) para manter sua capacidade de filtragem.<\/p>","protected":false},"excerpt":{"rendered":"

Filtration is a solid-liquid separation process that uses a porous filter medium to intercept solid particles in the suspension and let the liquid pass through.…<\/p>","protected":false},"author":1,"featured_media":5841,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[5849,5836,5848,5834,5831,5832,5835,5833,5837,5838,5840,5839,5841,5846,5842,5845,5843,5847,5844],"class_list":["post-5839","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-porous-filter-medium-for-alcom-aluminum-malaysia","tag-porous-filter-medium-for-aluminium-batangan-jakarta","tag-porous-filter-medium-for-aluminum-malaysia","tag-porous-filter-medium-for-asahan-aluminium","tag-porous-filter-medium-for-inalum","tag-porous-filter-medium-for-inalum-adalah","tag-porous-filter-medium-for-inalum-indonesia","tag-porous-filter-medium-for-indonesia-asahan-aluminium","tag-porous-filter-medium-for-malaysia-aluminium","tag-porous-filter-medium-for-malaysia-aluminium-alloy","tag-porous-filter-medium-for-malaysia-aluminium-scrap","tag-porous-filter-medium-for-malaysia-aluminium-smelter","tag-porous-filter-medium-for-malaysia-aluminum","tag-porous-filter-medium-for-malaysia-aluminum-alloy","tag-porous-filter-medium-for-malaysia-aluminum-company","tag-porous-filter-medium-for-malaysia-aluminum-foil","tag-porous-filter-medium-for-malaysia-aluminum-ingot","tag-porous-filter-medium-for-malaysia-aluminum-manufacturer","tag-porous-filter-medium-for-malaysia-aluminum-smelter"],"yoast_head":"\nPorous 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