GRAVITY CONCENTRATION OF PRIMARY TIN ORE FROM BANGKA ISLAND USING SHAKING TABLE AND JIG

• Main Author: Gesar Hanafi, Adhitia
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/64802
• Institution: Institut Teknologi Bandung

The decrease in quality of secondary tin ore deposits in Indonesia is currently encouraging the exploitation of primary tin deposits. Processing of primary tin deposit poses a challenge, because cassiterite (SnO2) as the prime mineral source of tin are occurring in hard-rock deposit. In order to meet the feed criteria of tin smelting, primary tin ore need to pass several stages of concentration. Gravity concentration method is suitable for primary tin ore because cassiterite and the gangue minerals has a fairly large density difference. Research was conducted to determine the effects of several variables in gravity concentration process using shaking table and jig against the grade and recovery of tin. To find out the characteristic of primary tin ore from Bangka Island, mineragraphy using optical microscope, X-ray Diffraction (XRD), and chemical composition analysis by X-ray Fluorescence (XRF) were conducted. Furthermore, the ore was processed using shaking table at various size fraction of feed, the rate of wash water, and the tilt of deck table, whereas the concentration process using jig was performed by varying the size fraction of feed and the rate of the water. The products were analyzed using a portable XRF equipment. The result of XRD test detected the presence of cassiterite, quartz, hematite, and corundum, while result of XRF shows assay of Fe 42.60%, and 30.10% for assay of Sn. The mineragraphy observation indicated the size of cassiterite was not greater than 100 ?m. The experiments showed that the smaller the size fraction of feed, the bigger the tin grade in concentrate resulted from both of shaking table and jig, but the tin recovery was lower. The increase in the rate of wash water in concentration using shaking table didn’t show any significant influence towards the tin grade, but resulted a decrease of tin recovery. For separation using jig, the increase in the rate of water decreased the tin recovery, but increased the tin grade. An increase in the tin grade of shaking table concentrate with the increase of tilt of deck table wasn’t accompanied by the increase in the tin recovery too. The best conditions of beneficiation using shaking table were achieved when the size fraction of feed was -106+75?m, the rate of wash water 9 liters/minute, and the tilt of deck table 3°, with the tin grade 50.10% and tin recovery 79.65%. The best separation using jig resulted the tin grade of 45.35% with tin recovery 69.18% at size fraction of feed -300+212?m and the rate of water 4 liters/minute.