{"id":2469,"date":"2024-12-26T11:31:30","date_gmt":"2024-12-26T03:31:30","guid":{"rendered":"https:\/\/www.superfinemill.com\/?p=2469"},"modified":"2024-12-26T11:34:30","modified_gmt":"2024-12-26T03:34:30","slug":"ball-mill-loading-ratio-and-steel-ball-size-distribution","status":"publish","type":"post","link":"https:\/\/www.superfinemill.com\/id\/ball-mill-loading-ratio-and-steel-ball-size-distribution\/","title":{"rendered":"Rasio Pemuatan Ball Mill dan Distribusi Ukuran Bola Baja"},"content":{"rendered":"<div data-elementor-type=\"wp-post\" data-elementor-id=\"2469\" class=\"elementor elementor-2469\">\n\t\t\t\t<div class=\"elementor-element elementor-element-0529221 e-flex e-con-boxed e-con e-parent\" data-id=\"0529221\" data-element_type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-8722214 elementor-widget elementor-widget-text-editor\" data-id=\"8722214\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><\/p><p>Saat menggunakan ball mill, praktisi yang belum memiliki banyak pengalaman sering menghadapi masalah: bagaimana cara menambahkan bola baja ke ball mill sesuai dengan proporsi ukuran bola baja? Hal ini terutama bergantung pada berbagai sifat ball mill, seperti: ukuran diameter, kekerasan bijih, ukuran partikel bijih ball mill, kekerasan bola baja (kualitas), kecepatan ball mill, dan faktor lainnya.<\/p><p><\/p><figure class=\"wp-block-image size-large\"><img decoding=\"async\" class=\"wp-image-7495\" src=\"https:\/\/www.epic-powder.com\/wp-content\/uploads\/2024\/12\/Steel-balls-of-ball-mill-1024x768.webp\" alt=\"\" \/><\/figure><p><\/p><h2 class=\"wp-block-heading has-large-font-size\">I. Prinsip Utama untuk Pengukuran Bola Baja<\/h2><p><\/p><p><strong>Kekerasan Material<\/strong>: Semakin keras material yang digiling, semakin besar bola baja yang dibutuhkan.<\/p><p><\/p><p><strong>Diameter Penggilingan<\/strong>:Untuk penggilingan yang lebih besar, gaya tumbukan yang lebih besar memerlukan penggunaan bola baja yang lebih kecil.<\/p><p><\/p><p><strong>Jenis Partisi<\/strong>:Saat menggunakan partisi tempat sampah ganda, bola baja harus lebih kecil daripada bola baja yang digunakan pada partisi tempat sampah tunggal dengan bagian pembuangan yang sama.<\/p><p><\/p><p><strong>Distribusi Bola<\/strong>: Biasanya, distribusi bola empat tingkat digunakan. Ini berarti bola yang lebih besar dan lebih kecil digunakan dalam jumlah yang lebih sedikit, sedangkan bola berukuran sedang lebih banyak digunakan. Dengan kata lain, &quot;lebih sedikit di kedua ujung dan lebih banyak di tengah.&quot;<\/p><p><\/p><h2 class=\"wp-block-heading has-large-font-size\">II. Rasio Bola Baja untuk Efisiensi Penggilingan Tinggi<\/h2><p><\/p><p>Untuk efisiensi penggilingan yang optimal, rasio bola baja berikut dianggap ideal. Keseimbangan ini memastikan pengoperasian ball mill yang paling ekonomis:<\/p><p><\/p><figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td><strong>Diameter Bola Baja (mm)<\/strong><\/td><td><strong>\u03a6100<\/strong><\/td><td><strong>Nomor 80<\/strong><\/td><td><strong>Nomor 60<\/strong><\/td><td><strong>Nomor 40<\/strong><\/td><td><strong>Nomor 20<\/strong><\/td><\/tr><tr><td>Beban Massa\/Total (%)<\/td><td>7.50%<\/td><td>6.90%<\/td><td>33.50%<\/td><td>30.10%<\/td><td>22%<\/td><\/tr><\/tbody><\/table><\/figure><p><\/p><p class=\"has-large-font-size\">III. Cara Menambahkan Bola Baja Berdasarkan Proporsi Ukuran<\/p><p><\/p><p>Saat ball mill baru pertama kali dipasang, ball mill akan melalui periode running-in. Selama waktu ini, beban awal bola baja harus sekitar 80% dari kapasitas maksimum ball mill. Bola baja dapat ditambahkan secara proporsional dengan ukurannya (misalnya, \u03a6120mm, \u03a6100mm, \u03a680mm, \u03a660mm, \u03a640mm), disesuaikan berdasarkan kebutuhan operasional ball mill.<\/p><p><\/p><p>Pemuatan dan Pengukuran Bola Baja di Ball Mill<\/p><p><\/p><p><strong>Jumlah Pemuatan Bola Baja<\/strong>: Total beban bola bervariasi tergantung pada model ball mill. Misalnya, ball mill MQG1500\u00d73000 (dengan kapasitas pemrosesan 100-150 ton) memiliki beban bola maksimum 9,5-10 ton. Saat menambahkan bola baja untuk pertama kalinya, distribusinya biasanya sebagai berikut:<\/p><p><\/p><ul class=\"wp-block-list\"><li>Bola besar (\u03a6120mm dan \u03a6100mm): 30%-40%<\/li><li>Bola sedang (\u03a680mm): 30%-40%<\/li><li>Bola kecil (\u03a660mm dan \u03a640mm): 30%<\/li><\/ul><p><\/p><p>Berat bola baja yang ditambahkan harus berdasarkan kualitasnya. Bola baja yang berkualitas tinggi dan tahan aus lebih disukai. Jumlah bola baja yang ideal adalah 0,8 kg per ton bijih untuk bola berkualitas baik, sedangkan bola baja umum mungkin memerlukan 1-1,2 kg per ton bijih.<\/p><p><\/p><p><strong>Rasio Ukuran Bola Baja<\/strong>:Ukuran bola baja yang ditambahkan tergantung pada diameter ball mill:<\/p><p><\/p><ul class=\"wp-block-list\"><li>Untuk penggilingan dengan diameter kurang dari 2500mm, gunakan bola \u03a6100mm, \u03a680mm, dan \u03a660mm.<\/li><li>Untuk penggilingan dengan diameter lebih besar dari 2500mm, gunakan bola \u03a6120mm, \u03a6100mm, dan \u03a680mm.<\/li><\/ul><p><\/p><h2 class=\"wp-block-heading has-large-font-size\">IV. Pemilihan Media Penggilingan Tahan Aus (Bola Penggiling)<\/h2><p><\/p><p>Pada tahun 1994, industri bahan bangunan Tiongkok menetapkan standar JC\/T535-94 \u201cBola Penggiling Cor Paduan Kromium untuk Industri Bahan Bangunan\u201d. Standar ini kemudian disempurnakan dengan standar nasional GB\/T17445-1998 \u201cBola Penggiling Cor,\u201d yang menguraikan komposisi kimia, sifat mekanis, spesifikasi, dan metode pemeriksaan untuk bola kromium tinggi, bola kromium sedang, bola kromium rendah, dan bola besi ulet bainit.<\/p><p><\/p><h2 class=\"wp-block-heading has-large-font-size\">V. Sifat-sifat Bola Penggiling Berkualitas Tinggi<\/h2><p><\/p><p>Bola penggiling yang berkualitas baik harus memiliki sifat-sifat utama berikut:<\/p><p><\/p><p><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Wear\">Memakai<\/a> Perlawanan<\/strong>: Bola gerinda harus tahan terhadap berbagai bentuk keausan, termasuk pemotongan, deformasi, dan pengelupasan akibat kelelahan. Untuk keausan akibat pemotongan, kekerasan tinggi sangat penting. Untuk keausan akibat deformasi dan kelelahan, bola harus memiliki ketahanan terhadap kelelahan regangan, kelelahan kontak, dan kelelahan benturan yang tinggi.<\/p><p><\/p><p><strong>Ketahanan terhadap benturan<\/strong>: Bola penggiling harus mempunyai ketahanan benturan yang sangat baik, tidak mudah pecah saat terkena benturan berulang kali.<\/p><p><\/p><p><strong>Kemampuan mengeras<\/strong>: Bola, terutama yang berukuran besar (\u03a6100mm), harus memiliki kekerasan yang seragam di seluruh permukaan untuk mencegah hilangnya kebulatan dan memastikan kinerja yang konsisten.<\/p><p><\/p><p><strong>Kualitas Metalurgi<\/strong>: Bola penggiling berkualitas tinggi harus diproduksi sesuai standar yang ditentukan tanpa cacat pengecoran seperti inklusi terak atau inklusi pasir.<\/p><p><\/p><p>Untuk ruang penggilingan kasar, bola kromium tinggi direkomendasikan, sedangkan untuk penggilingan halus, bola kromium rendah dapat digunakan. Dalam aplikasi penggilingan basah, bola kromium rendah atau bola baja tempa lebih disukai, karena ketahanan aus bola kromium tinggi kurang efektif dalam kondisi korosif. Untuk ketahanan aus yang lebih baik, bola cor yang dicetak dengan logam dianggap sebagai pilihan terbaik.<\/p><p><\/p><h2 class=\"wp-block-heading has-large-font-size\">VI. Mengoptimalkan Sistem Pemuatan Bola<\/h2><p><\/p><p>Sistem pemuatan bola yang dirancang dengan baik sangat penting untuk pengoperasian pabrik yang efisien. Sistem ini mencakup beberapa faktor:<\/p><p><\/p><ul class=\"wp-block-list\"><li><strong>Kualitas Bola Baja<\/strong>: Ini mengacu pada kepadatan, kekerasan, dan ketahanan aus bola baja.<\/li><li><strong>Ukuran Bola Baja<\/strong>: Bola dengan diameter lebih besar menghasilkan gaya tumbukan lebih besar, sementara bola yang lebih kecil membantu menggiling partikel bijih yang lebih halus dengan meningkatkan jumlah tumbukan per satuan waktu.<\/li><li><strong>Tingkat Pengisian Bola<\/strong>: Semakin kecil diameter bola (ketika laju pengisian konstan), semakin banyak jumlah bola dan semakin sering terjadi benturan.<\/li><\/ul><p><\/p><p>Untuk bijih yang keras dan kasar, diperlukan bola dengan diameter lebih besar dan kepadatan tinggi untuk penggilingan yang lebih baik. Namun, untuk partikel bijih yang halus, diperlukan bola yang lebih kecil untuk meningkatkan efisiensi penggilingan. Saat ini, beberapa konsentrator di Tiongkok menambahkan bola baja berdiameter 100 mm tanpa mempedulikan ukuran bijih, yang tidak efisien dan menyebabkan penghancuran yang berlebihan dan peningkatan konsumsi bola baja. Bola yang lebih besar lebih cepat aus, sehingga biayanya lebih tinggi.<\/p><p><\/p><h3 class=\"wp-block-heading\">Saran untuk Mengganti Bola Kromium Rendah dan Bola Tempa dengan Bola Kromium Tinggi<\/h3><p><\/p><p>Karena industri terus berupaya meningkatkan kemajuan teknologi guna meningkatkan produktivitas dan mengurangi biaya, penggantian bola baja tempa dan kromium rendah dengan bola kromium tinggi menjadi inovasi penting.<\/p><p><\/p><p>Meskipun bola kromium rendah dan bola baja tempa telah banyak digunakan dalam industri seperti produksi semen, pembangkit listrik termal, dan pertambangan bijih besi, ketahanan ausnya sering kali tidak memadai. Beberapa produsen dalam negeri telah mencoba mengganti bola kromium rendah dan bola tempa dengan bola cor kromium tinggi. Namun, upaya ini terhambat oleh kualitas produk yang buruk, kurangnya ketahanan aus, dan kerusakan sesekali, sehingga tidak layak secara ekonomi.<\/p><p><\/p><p>Meskipun menghadapi tantangan ini, penggantian bola kromium rendah dan bola tempa dengan bola kromium tinggi merupakan lompatan maju yang besar, terutama dalam industri dengan kondisi penggilingan yang sulit. Bagi perusahaan yang ingin tumbuh, peningkatan kualitas produk dan pengurangan biaya secara terus-menerus diperlukan untuk memperoleh manfaat penuh.<\/p><p><\/p><p>Di banyak pasar luar negeri, bola cor paduan kromium tinggi sudah menjadi standar. Para peneliti kami telah mengembangkan bola dengan kekerasan tinggi dan kromium tinggi yang menawarkan ketahanan aus, ketahanan benturan, dan ketahanan korosi yang sangat baik. Dengan mengoptimalkan komposisi kimia dan proses perlakuan panas, bola ini mencapai:<\/p><p><\/p><ul class=\"wp-block-list\"><li>Kekerasan (HRC) lebih besar dari 56<\/li><li>Nilai dampak \u22654J\/cm\u00b2<\/li><li>Daya tahan jatuh lebih dari 10.000 kali<\/li><li>Ketahanan aus yang lebih dari dua kali lipat dari bola kromium rendah standar<\/li><\/ul><p><\/p><p>Inovasi ini menyoroti ketahanan aus yang unggul dari bola kromium tinggi, memposisikannya sebagai masa depan media penggilingan dalam industri.<\/p><p><\/p><h2 class=\"wp-block-heading has-large-font-size\">VII. Parameter Utama dalam Metode Distribusi Bola Dua Tahap<\/h2><p><\/p><p>Saat menggunakan metode distribusi bola dua tahap di pabrik, beberapa parameter penting harus dipertimbangkan:<\/p><p><\/p><p><strong>Diameter Bola Besar<\/strong>: Mirip dengan distribusi bola multitahap, pilihan diameter bola besar bergantung pada ukuran partikel material yang dimasukkan ke dalam penggilingan. Namun, dalam metode dua tahap, diameter didasarkan pada ukuran partikel representatif, yaitu ukuran partikel yang merupakan proporsi terbesar dari material. Dalam praktiknya, diameter bola sekunder dari distribusi multitahap dapat berfungsi sebagai referensi. Misalnya, jika diameter bola maksimum dalam distribusi multitahap adalah 100 mm, bola baja \u03a690 mm akan dipilih untuk distribusi bola sekunder.<\/p><p><\/p><p><strong>Rasio Bola<\/strong>: Rasio antara bola besar dan kecil harus seimbang untuk memastikan bahwa penambahan bola kecil tidak mengganggu laju pengisian bola besar. Biasanya, bola kecil harus mencapai 3% hingga 5% dari berat bola besar. Dalam aplikasi praktis, disarankan untuk memulai dengan batas bawah (3%) dan menyesuaikannya sesuai dengan kondisi produksi tertentu.<\/p><p><\/p><p><strong>Diameter Bola Kecil<\/strong>: Ukuran bola-bola kecil bergantung pada jarak antara bola-bola yang lebih besar, artinya bola-bola tersebut terkait dengan diameter bola-bola yang lebih besar. 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