Sains Malaysiana 49(12)(2020): 2927-2940

http://dx.doi.org/10.17576/jsm-2020-4912-05

Mechanical Impact in Disk Mill for Producing Controlled Rice Husk Particle Size by Changing Impactor Shapes and Disk Rotation Speeds

(Kesan Mekanikal di Kilang Cakera untuk Menghasilkan Saiz Zarah Sekam Padi Terkawal dengan Mengubah Bentuk Impak dan Kelajuan Putaran Cakera)

ASEP BAYU DANI NANDIYANTO¹*, RISTI RAGADHITA¹, AJENG SUKMAFITRI¹, MUHAMMAD ROIL BILAD², MUHAMMAD AZIZ³ & JUMRIL YUNAS⁴

¹Departemen Kimia, Universitas Pendidikan Indonesia, Bandung, Indonesia

²Chemical Engineering Department, Universiti Teknologi Petronas, 31750 Tronoh, Perak Darul Ridzuan, Malaysia

³Institute of Industrial Science, The University of Tokyo, Tokyo, 153-8505, Japan

⁴Institute of Microengineering and Nanoelectronics (IMEN), Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor Darul Ehsan, Malaysia

Diserahkan: 20 Julai 2020/Diterima: 8 Ogos 2020

ABSTRACT

The purpose of this study was to evaluate regulation of mechanical impact (i.e. impactor sizes and shapes) on triangle, cylinder, and cube as well as disk rotation speed (from 600 to 1500 rpm) in disk mill for controlling size-reduction process. As a model of size-reduced material, rice husk was selected. The study was done by evaluating the final milling product size, which was completed by the measurement of energy impact during the milling process. Experimental results showed that the product size was controllable in the range of between 50 and 1000 μm. The impactor sizes and shapes influenced the contact diameter and area of impactor for making more materials being collided, whereas disk rotation speed led to giving more collision number (between rice husk and impactor) and increasing impact from the collision (due to less time contact during collision). This study provides an important information, which can be further generalized in the use of milling process as a tool for materials size-reduction and mechanochemical process.

Keywords: Disk mill; education; impactor shapes; mechanical impact; milling process; particle size distribution

ABSTRACT

Tujuan kajian ini adalah untuk menilai peraturan ketetapan impak mekanikal (seperti ukuran dan bentuk impak) dalam segitiga, silinder dan kubus serta kelajuan putaran cakera (dari 600 hingga 1500 rpm) di kilang cakera untuk mengawal proses penurunan saiz. Sebagai model bahan saiz terkurang, sekam padi telah dipilih. Kajian ini dijalankan dengan menilai ukuran akhir produk yang dikisar dan disempurnakan dengan pengukuran kesan tenaga hentaman semasa proses pengisaran. Keputusan uji kaji menunjukkan bahawa ukuran produk dapat dikawal dalam lingkungan 50-1000 μm. Saiz dan bentuk impak mempengaruhi diameter sentuhan dan luas kawasan pemukul kerana lebih banyak bahan berlanggar, sedangkan kelajuan putaran cakera menyebabkan lebih banyak bilangan pelanggaran (antara sekam padi dan impak) dan peningkatan jumlah impak daripada pelanggaran (disebabkan masa sentuhan yang singkat daripada pelanggaran). Kajian ini menyediakan maklumat yang penting dan dapat dikaji dengan lebih lanjut dalam proses pengisaran sebagai alat untuk pengurangan saiz bahan dan proses kimia mekanik.

Kata kunci: Bentuk impak; kilang cakera; pendidikan; proses penghancuran; sifat mekanikal; taburan saiz zarah

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*Pengarang surat-menyurat; email: nandiyanto@upi.edu