PREPARATION OF SUB-MICRON MAGNETIT AS MAGNETIC AGENT FOR ACTIVATED CHARCOAL USING UG-SHAKER MILL

• Main Author: Qolby, Ihsanul
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/37224
• Institution: Institut Teknologi Bandung

Magnetite is one of the minerals commonly used in everyday life. In addition to extraction applications, magnetite has also been widely used as a functional material on other purposes such as drug delivery, medical imaging, and others. In order to be utilized as a functional material, magnetite is processed into a small size, making it suitable for its application needs. The method commonly used in the production of magnetite as a functional material is dominated by synthesis method rather than the physical method. In this study, magnetites originating from Lampung region was processed into sub-micron size using mechanical grinding methods with UG-Shaker Mill grinding tools. A series of mechanical grinding experiments from magnetite to sub-micron particles was carried out by crushing the chunks of magnetite to the size of 200 mesh sieve. Then, the products of this sieve were milled in UG-Shaker Mill with different compositions of 5%, 10%, 15%, and 20% weight ratio, with grinding media size of 6 mm, 8 mm, and 10 mm. Milling speed is maintained at 700 rpm during the experiment with a fixed milling time of 6 hours for each experiment and the filling ratio is kept at 6.74 ± 0.2%. The samples were then characterized to observe their properties transition. The characterization was conducted by analyzing the size distribution with PSA to determine the total sub-micron produced. Then, the chemical composition of the samples was analyzed by using XRD and XRF, the changes in crystallinity were characterized by using XRD and morphological observation of samples was carried out by using SEM. The magnetic properties of the sub-microns produced were also characterized using VSM. The sub-micron particle fraction of 19.12% and the highest magnetic properties of 0.0061 T were obtained from experiments with 5% weight ratio and grinding media size of 6 mm. In this composition, there was an increase in the number of magnetite sub-micron sizes as many as 2.73 times compared to the raw condition. A lower weight ratio resulted in an increase of the sub-micron particles produced. The smaller size of grinding media also increased the number of sub-micron particles produced. In addition, the chemical composition of the sample, initially consisted of magnetite and maghemite, changed into diamagnetic hematite. The amount of hematite increased with the increasing size of grinding media and weight ratio, resulting in magnetic value reduction of the sub-micron particles.