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This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License
Article
Author(s)
Taufik Arief1, Fajri Vidian2 and Nina Tanzerina3
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DOI:10.17265/2162-5298/2022.05.003
Affiliation(s)
1. Department of Mining Engineering, Faculty of Engineering, Sriwijaya University, Palembang City 30139, South Sumatera, Indonesia
2. Mechanical Engineering Department, Faculty of Engineering, Sriwijaya University, Palembang City 30139, South Sumatera, Indonesia
3. Biology Department, Faculty of Mathematics and Education, Sriwijaya University, Palembang City 30139, South Sumatera, Indonesia
ABSTRACT
Shaking table is a technology that is still used in processing of tin ore using water as a medium. In the application at PT Timah Tbk, the shaking table is still used to process low grade tin ore into tin ore with a standard smelting grade of PT Timah (72%-74% Sn). In processing tin ore using a shaking table, valuable minerals and impurity minerals are separated based on differences in specific gravity, size and shape of the mineral. To get the recovery of valuable minerals (recovery) and optimal grades, it is strongly influenced by the separation variables of tin ore minerals. These variables include riffle, slope of deck, washing water rate, stroke length, and deck movement speed. This study aims to vary the number of riffles, table slope and time in a laboratory scale to obtain optimal recovery and grade of tin ore. Tin ore samples were obtained from the washing residue of the Toboali Washing Plant tin ore. In the experiment, the numbers of riffles set were 16 (R1), 24 (R2) and 34 (R3). The table slopes were 2° (S1), 3° (S2), and 4° (S3). Time variations were 15 (T1), 20 (T2) and 25 min (T3). The relationship between the number of riffles and the grade can be determined through quadratic polynomial regression analysis with the function Ŷ = -20.60 + 2.26X + (-0.04X2), while the relationship between the number of riffles and recovery is determined by the function Ŷ = -173.33 + 17.376 X + (-0.315X2). Optimal levels are obtained at variations in the number of riffle 26 by 66.43%, with levels of 8.45% Sn. Optimal recovery is obtained on the variation of the number of riffle 28 with a recovery of 66.43%.
KEYWORDS
Tin ore, shaking table, riffle, content, recovery.
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