{"id":2787,"date":"2020-09-11T06:57:21","date_gmt":"2020-09-11T06:57:21","guid":{"rendered":"https:\/\/www.aluminiumceramicfiber.com\/?p=2787"},"modified":"2020-09-11T06:57:21","modified_gmt":"2020-09-11T06:57:21","slug":"purification-method-of-molten-aluminum","status":"publish","type":"post","link":"https:\/\/www.aluminiumceramicfiber.com\/id\/purification-method-of-molten-aluminum\/","title":{"rendered":"Metode Pemurnian Aluminium Cair"},"content":{"rendered":"

Metode pemurnian aluminium cair adalah dengan memanfaatkan adsorpsi yang dihasilkan oleh bahan pemurnian untuk menghilangkan inklusi teroksidasi dan gas.<\/p>\n

\"Metode<\/p>\n

Metode Pemurnian Aluminium Cair<\/h2>\n

Pembersihan dengan gas inert<\/strong>. Gas inert adalah gas yang tidak bereaksi secara kimiawi dengan aluminium cair dan hidrogen terlarut, serta tidak larut dalam aluminium. Penghilangan Gas dengan Nitrogen<\/a> biasanya digunakan. Inklusi dalam aluminium cair dapat secara otomatis terserap oleh gelembung nitrogen dan dibawa keluar dari permukaan cairan. Prinsip degassing nitrogen adalah bahwa tekanan awal di dalam gelembung nitrogen adalah nol, dan terdapat perbedaan tekanan pada antarmuka antara gelembung dan aluminium cair, sehingga hidrogen yang terlarut dalam logam cair terus-menerus tersedot ke dalam gelembung hingga tekanan parsial hidrogen di dalam gelembung dan tekanan parsial hidrogen dalam aluminium cair menjadi sama; pada saat itu proses berhenti, gelembung naik ke permukaan, dan hidrogen di dalam gelembung terlepas ke atmosfer. Oleh karena itu, baik inklusi oksidasi maupun hidrogen dikeluarkan selama gelembung naik ke permukaan. Suhu aliran nitrogen sebaiknya dikendalikan pada 710\u2013720 \u00b0C untuk mencegah nitrogen bereaksi dengan aluminium cair sehingga membentuk aluminium nitrida. Magnesium dan nitrogen mudah membentuk magnesium nitrida. Oleh karena itu, paduan aluminium-magnesium tidak cocok untuk proses pemurnian dengan nitrogen.<\/p>\n

Pembersihan gas aktif<\/strong>. Untuk aluminium, gas aktif utamanya adalah klorin, dan klorin sendiri tidak larut dalam aluminium; namun, klorin bereaksi dengan cepat dengan aluminium serta hidrogen yang terlarut dalam cairan aluminium. Produk reaksi HCl dan AlCl\u2083 (titik didih 183\u00b0C) keduanya berbentuk gas, tidak larut dalam aluminium cair, dan dapat berperan dalam pemurnian bersama dengan klorin yang tidak ikut bereaksi, sehingga efek pemurniannya jauh lebih baik daripada peniupan nitrogen, dan efek penghilangan natriumnya juga signifikan. Meskipun klorin memiliki efek pemurnian yang baik, zat ini berbahaya bagi tubuh manusia, mencemari lingkungan, mudah merusak peralatan dan elemen pemanas, serta mudah menyebabkan struktur kristal ingot paduan menjadi kasar; oleh karena itu, ventilasi dan perlindungan harus diperhatikan saat menggunakannya.<\/p>\n

Pembersihan dengan campuran gas.<\/strong> Proses pemurnian hanya dengan nitrogen saja tidak efektif, dan klorin berbahaya bagi lingkungan serta peralatan, sehingga pemurnian dengan campuran gas sering digunakan untuk meningkatkan efektivitas pemurnian dan mengurangi dampak merugikannya. Baik AlCl\u2083 maupun CO\u2082 memiliki efek pemurnian dan dapat mendekomposisi Al\u2082O\u2083 secara parsial, sehingga efektivitas pemurnian meningkat secara signifikan.<\/p>\n

Pemurnian garam klorin<\/strong>. Garam klorida yang umum digunakan antara lain klorida seng, klorida mangan, heksakloroetana, tetraklorometana, tetraklorotitanium, dan sebagainya. Karena garam klorida memiliki sifat menyerap kelembapan, perlu diperhatikan proses pengeringan dan menjaga agar tetap kering saat digunakan. Zn memengaruhi kandungan beberapa paduan, sehingga perlu memperhatikan takaran yang tepat saat menggunakannya.<\/p>\n

Bahan pemurnian yang tidak beracun.<\/strong> Paduan aluminium bahan pemurnian<\/a> terutama berupa garam klorida dan fluorida dari logam alkali. Efek pemurnian fluks terutama bergantung pada kemampuannya untuk menyerap dan melarutkan inklusi yang teroksidasi. Secara umum, kelarutan garam cair terhadap oksida tidak terlalu besar, biasanya berkisar antara 1% hingga 2%. Jika krioit ditambahkan ke dalam fluks, kelarutan fluks terhadap oksida akan meningkat secara signifikan.<\/p>","protected":false},"excerpt":{"rendered":"

Purification method of molten aluminum is to rely on the adsorption produced by the refining agent to achieve the purpose of removing oxidized inclusions and gases. Purification Method of Molten Aluminum Purge with inert gas. Inert gas refers to a gas that does not chemically react with molten aluminum and dissolved hydrogen, and does not […]<\/p>\n","protected":false},"author":1,"featured_media":2788,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[86],"tags":[7004,798,7272],"class_list":["post-2787","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-degassing-with-nitrogen","tag-flux-refining","tag-purification-method-of-molten-aluminum"],"yoast_head":"\nPurification Method of Molten Aluminum by Refining Agent<\/title>\n<meta name=\"description\" content=\"Purification method of molten aluminum is to rely on the adsorption produced by the refining agent to achieve inclusions and gases removal.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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