Document Type : Original Research Paper
Authors
- Mostafa Maleki Moghaddam 1
- Hosein Najmaddaini 2
- Saeid Zare 3
- Masoud Rezaei 3
- Mohammad Ali Motamedineya 2
- Gholamreza Biniaz 4
1 Mineral Processing Group, Vali-e-Asr University of Rafsanjan, Rafsanjan, Iran.
2 Mineral Processing Group, Vali-e-Asr University of Rafsanjan, Rafsanjan, Iran
3 Shahid Bahonar University of Kerman, Kerman, Iran
4 Sarcheshmeh Copper Complex, Rafsanjan, Iran
Abstract
Abstract
The structural characteristics of mill liners, such as lifter shape and mill speed, significantly influence the grinding process. At the Sarcheshmeh slag flotation plant, the 6×6 meters SAG mill was initially equipped with 48 rows of liners, designed in a Hi-Lo configuration for the first half and a Lo-Lo configuration for the second. Throughout the mill shell liner's 1700-hour operational period, monitoring identified 30 failures. Investigations revealed that defects in the liner design and improper charge motion were the main causes. This study proposes modifications and standardization of the shell liner design, tailored to the specific circuit conditions, to enhance performance and reliability. The redesign included several key changes: 1) Reducing the number of rows: The number of liner rows was decreased from 48 to 32. 2) Adjusting lifter angle: The lifter angle was increased from 23 to 30o to optimize performance. 3) Eliminating Hi-Lo design liners: The Hi-Lo design liners were changed to Hi-Hi, and 4) Reducing liner variety: The variety of liners was streamlined from 5 types to 2. The installation of the proposed liners optimized the charge trajectory for grinding, resulting in higher liner's lifetime. It extended the liner life by 30% and eliminated liner failures, reducing them from 30 to zero. The wear rate for the proposed design was 0.05 mm/hour, while the original design had a wear rate of 0.11 mm/hour. This difference corresponds to a factor of 2.3 times improvement.
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