PENCUCIAN MATERIAL MAGNETIK PASIR BESI LANSILOWO MENGGUNAKAN LARUTAN ASAM KLORIDA
Authors: Prasdiantika Ricka , Susanto Susanto 
Published: February 2020

Iron sand was widely used in various fields such as in the manufacturing of magnets, cement, and steel. Iron sand has the main composition of iron oxide and several impurities of oxides. To remove these impurities, iron sand needs to be washed with acidic solution such as HCl solution. This study aims to minimize impurities in the magnetic material of Lansilowo iron sand. Iron sand was prepared using an external magnet to obtain magnetic material. The magnetic material was washed using distilled water and 0.5 M HCl solution. The drying process was carried out at 80oC for 24 hours. Magnetic material was crushed, weighed, and characterized. Material characterization was carried out using X-Ray Fluorescence (XRF), Fourier Transform Infrared (FT-IR) Spectrophotometer, and X-Ray Diffractometer (XRD). The Characterization results showed that washing of magnetic material using H2O-HCl 0.5 M was able to increase the percentage of Fe element composition in Lansilowo iron sand. The iron oxide contained in Lansilowo Iron Sand remains magnetite. The washing the iron sand magnetic material using 0.5 M HCl solution succeeded in removing impurities such as Mg, Pr, K, Cl, P, S, Co, Ce, and Sn as well as reducing the percentage of the Si and Al elements.The washing magnetic material using 0.5 M H2O-HCl produced higher XRD intensities than those washed with H2O. The washing magnetic material with 0.5 M H2O-HCl was result particle size of 37,70 ± 4,62 nm  and crystallinity of 53.12%.Pasir besi banyak dimanfaatkan dalam berbagai bidang seperti pada industri pembuatan magnet, semen, dan baja. Pasir besi memiliki kandungan oksida besi dan beberapa oksida pengotor. Untuk menghilangkan oksida-oksida pengotor tersebut, pasir besi perlu dicuci dengan larutan asam seperti larutan HCl. Penelitian ini bertujuan untuk meminimalisir oksida-oksida pengotor pada material magnetik pasir besi Lansilowo. Pasir besi dipreparasi menggunakan magnet eksternal untuk mendapatkan material magnetik. Material magnetik dicuci menggunakan akuades dan larutan HCl 0,5 M. Proses pengeringan dilakukan pada suhu 80oC selama 24 jam. Material magnetik digerus, ditimbang, dan dikarakterisasi. Karakterisasi material dilakukan menggunakan X-Ray Fluorescence (XRF), Fourier Transform Infrared (FT-IR) Spectrophotometer dan X-Ray Difraktometer (XRD). Hasil karakterisasi menunjukkan bahwa pencucian material magnetik dengan menggunakan H2O-HCl 0,5 M mampu meningkatkan persentase komposisi unsur Fe material magnetik pasir besi Lansilowo. Oksida besi yang terkandung dalam Pasir Besi Lansilowo tetap magnetit. Pencucian material magnetik pasir besi menggunakan larutan HCl 0,5 M berhasil menghilangkan unsur-unsur pengotor seperti Mg, Pr, K, Cl, P, S, Co, Ce, dan Sn serta menurukan persentase komposisi dari unsur Si dan Al. Pencucian material magnetik menggunakan H2O-HCl 0,5 M menghasilkan intensitas XRD yang lebih tinggi dibandingkan yang dicuci dengan H2O. Pencucian material magnetik dengan H2O-HCl 0,5 M menghasilkan ukuran partikel 37,70 ± 4,62 nm dan kristalinitas sebesar 53,12%.