| |
A MODEL TO PREDICT WEAR RATE OF SHELL LINERS IN TUMBLING MILLS - THE SARCHESHMEH COPPER COMPLEX AND THE GOL-E-GOHAR IRON ORE COMPANY SAG MILL CASES
By
E. Nematollahi, Z. Bibak and A. Ghasemi, M. Maleki Moghaddam, S. Banisi
Published in
International Mineral Processing Congress (IMPC)
at
2016
Direct link:
http://kmpchemmat.ir/pii/71394
Abstract
The use of large AG/SAG mills in the mineral industry has been on the rise recently due to a significant reduction in the capital and operating costs for achieving significant increases in plant throughputs. The major reason for downtimes in these mills is the time taken for the replacement of broken or worn liners. This loss of “availability” of these units has a significant impact on the productivity of these plant operations. The ability to predict liner life time and its evolving shape could help to optimize these comminution operations. In the past decades, various models have been proposed to estimate liner wear rate, but because of their empirical nature they could only be used within certain limited operating conditions. In this research, a phenomenological model which could predict the liner wear rate was proposed and tested. This model considers parameters such as; operating conditions, liner hardness, pressure on the lifter, and, relative velocity of particles and mill shell. Data from industrially measured liner profiles were taken during the liner life time at the Sarcheshmeh and the Gol-E-Ghohar SAG mills to provide a solid base to calibrate and validate the model. The comparison of the model predictions with the actual measurements of the liner wear rate showed that the results were in a good agreement at both, the Sarcheshmeh (R2=0.94), and the Gol-E-Ghohar (R2=0.97) concentrators.
Keywords
SAG mill, liner removal time, wear rate, charge shape
|
|