Elda Rayhana, Elda
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PENGARUH MEDAN INDUKSI PADA SIFAT MAGNET MATERIAL NANO KOMPOSIT BSHF / BST Novizal, Novizal; C F., Musfira.; Rayhana, Elda
Jurnal Spektra Vol 15, No 1 (2014): Spektra: Jurnal Fisika dan Aplikasinya
Publisher : Jurnal Spektra

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Abstract

Dalam penelitian ini dilakukan pembuatan material nano komopsit hasil pencampuran 50 wt % material BSHF dan 50 wt %  material BST dengan menggunakan metoda mekanikal alloying dan sonikasi. Material di milling selama 80 jam, dilanjutkan  dengan pemanasan sampai 1100 oC selama 4 jam. Material yang sudah dalam bentuk Kristal di milling lagi selama 20 jam dan dilanjutkan dengan proses sonikasi selama 6 jam untuk mendapatkan material nano komposit.setelah pengeringan, dilakukan  pembuatan bulk dan dilanjutkan dengan karakterisasi XRD dan Fermagraph.. Material kedua dilakukan proses pembuatan  bulk sambil diinduksi magnet dari luar sebesar 5 mT. dan dilanjutkan dengan Fermagraph. Hasilnya memperlihatkan terjadi  perubahan sifat magnet dari material nano komposit. di indikasikan dengan perubahan nilai remanen dan nilai koersivitas  dari material.. Pengaruh induksi magnet pada material nano komposit BSHF / BST mengakibatkan perubahan nilai remanen sebesar 15 % dan nilai koersivitas 30 %. Kata kunci :, Mechanical Alloying , sonikasi induksi magnet remanen, dan koersivitas
Perolehan Tio2 Dari Iron Ore Mengandung Titanium Melalui Proses Reduksi Karbon Dan Pelarutan Asam Rayhana, Elda; Manaf, Azwar
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 2, No 02 (2012): IJAP VOLUME 02 ISSUE 02 YEAR 2012
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v2i02.1288

Abstract

REDUCTION AND LEACHING PROCESSES. Indonesia has a large source of iron ore which is quite tempting for the purposes of exploitation in form of raw materials as well as for the production of pig iron. However, not all sources of iron ore are proved useful since not only because the present of deposit is scattere dinamounts of less significant but also because it contains element of tin oxide compounds with iron like ilmenite or FeTiO3. However,ilmenite can actually be used as a source of titanium metal which is much more valuable than Fe it self. In order to recover the Ti from their respective compound it is required the release of strong bonds between the atoms in the compound. This paper reports the recovery of Ti oxide of ilmenite containing iron ore which was obtained through a combination of carbon reduction and acid leaching processes. Carbon reduction of iron ore was carried out through mechanical milling between iron ore and carbon with a ratio of 1:1. This was successively followed by a sintering at a temperature of 1000 oC employing a heating rate of 10 ° C/min for 0-3 hours. The reduction process has resulted in the formation of 27.83wt% TiO2. In order to improve the recovery level of TiO2, further reduction process was conducted through an HCl leaching. This successive stage produced fine powders in the form of deposits. Based on our quantitative analysis, the recovery of TiO2 increased to a level of 73.73%.