KINETIC STUDY AND PRODUCT CHARACTERIZATION OF SKARN TYPE PRIMARY TIN ORE GRINDING USING VARIATION OF BALL FILLING, FEED GRINDING BALL RATIO, AND MILL ROTATION SPEED
Tin is one of metal element that present in huge amount in Indonesia, especially in Kepulauan Bangka Belitung. High reserves are also followed by tin metal production in Indonesia, which is the second highest in the world. One of the companies that is engaged in producing tin is PT. Timah Tbk whi...
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| Format: | Final Project |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/41489 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Tin is one of metal element that present in huge amount in Indonesia, especially in
Kepulauan Bangka Belitung. High reserves are also followed by tin metal
production in Indonesia, which is the second highest in the world. One of the
companies that is engaged in producing tin is PT. Timah Tbk which had done
mining in Batubesi area, Belitung. Ore deposits in Batubesi area are deposits of
oxide clay, greisen, and skarn type ore. Among the types of ore, skarn type ore has
the characteristics of hard ore, so that the comminution process is needed. In this
experiment, grinding was conducted to find out influence of ball filling, feed ratio
with ball mill, and mill rotation speed variations toward the size of the primary tin
ore grinding products, grinding kinetics, and mineragraphy observation.
Ore preparation is done by doing crushing using roll crusher to produce a size of
2370 ?m which will be used as grinding feed. The grinding process is done for 150
minute with ball filling variable (20% volume, 30% volume, 40% volume, and 50%
volume), feed ratio with ball mill (1:10; 1:8; 1:6; and 1:4), and mill rotation speed
(50% Nc, 60% Nc, 70% Nc, and 80% Nc) also sieve analysis is done at each interval
grinding time. The result will be used for linear regression model analysis
In this study, kinetics study of skarn type primary tin ore with variations of ball
filling volume percentage shows that the highest value of initial rate of formation
for all ball filling volume variations achieved at a particle size of 250 ?m where the
highest initial rate of formation occurs in 50% mill volume. Variations of feed ratio
with ball mill shows that the highest value of initial rate of formation for 1:10, 1:8,
and 1:6 achieved at a particle size of 250 ?m and for 1:4 ratio at a particle size of
297 ?m where the highest initial rate of formation occurs in 1:10 feed ratio with
ball mill. Variations of mill rotation speed shows that the highest value of initial
rate of formation for all mill rotation speed variations at a particle size of 250 ?m
where the highest initial rate of formation occurs in 80% Nc mill rotation speed. In
this research produced two regression model that can predict P80 value based on the
grinding variables in this study. In mineragrafi observation, well separated particles
start at particle size -105 +63 ?m. |
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