How Infrared Monitoring Helped Avoid a Costly Ball Mill Failure
In the mining industry, maintaining the reliability of critical equipment is essential to ensuring continuous production and minimizing costly downtime. One such critical asset is the ball mill, a key component in mineral processing operations where material size reduction is achieved through impact and attrition.
In addition to Vibration and Lubrication monitoring Yellotec implemented thermal monitoring of the external mill shell to improve the condition monitoring of the inter mill wear lining. By combining manual and continuous thermal imaging technologies, the operation gained deeper insight into mill lining performance, wear patterns, and potential failure points.
The Challenge
Ball mills operate under extreme mechanical and thermal stress, leading to friction, misalignment and wear issues over time. Traditional inspections, often limited to shutdowns or manual checks, can result in missed early faults, unplanned downtime, higher maintenance costs, and reduced equipment lifespan.
The Solution
Yellotec deployed a dual approach using the FLIR T540 initially and then the fixed FLIR A70 camera with online software to provide continious monitoring of both primary and secondary mill liner conditions.
Manual Thermal Inspections
The FLIR T540 was used to conduct detailed thermal inspections of the mill during operation. These inspections enabled the team to:
- Identify high wear patterns on both primary and secondary mills
- Detect abnormal heat signatures linked to friction and liner degradation
- Pinpoint areas of concern, requiring maintenance attention
Thermal imaging revealed clear variations in temperature across the mill shell, highlighting zones of excessive wear that would not have been visible through conventional methods.
Continuous Thermal Monitoring
To enhance visibility even further, the FLIR A70 Smart Sensor was installed for real-time monitoring of the secondary mill. This provided:
- Continuous thermal data of the mill shell
- Early detection of temperature anomalies
- Trend analysis for predictive maintenance planning
With continuous thermal imaging, maintenance teams could monitor changes over time and respond to developing issues before they escalated into failures.
Key Findings
The implementation of thermal imaging uncovered several critical insights:
- High wear patterns were identified on both primary and secondary mills
- Temperature anomalies indicated uneven load distribution and potential internal issues
- Secondary mill shell conditions were monitored in real time, improving decision-making
These findings allowed for targeted maintenance interventions, reducing the need for reactive repairs.
Results and Impact
By integrating thermal imaging into their maintenance strategy, the operation achieved:
- Improved asset reliability through early liner wear detection
- Reduced unplanned downtime
- Enhanced maintenance planning with data-driven insights
- Significant cost avoidance by preventing major failures
The ability to continuously monitor the mill without interrupting production marked a major shift toward greater reliance on predictive maintenance.
Early detection of a potential shell failure prevented 72 hours of unplanned downtime, eliminating a major risk to production. While repair costs were minimal, the real impact was in avoiding an estimated R14.4 million in downtime-related losses.
Conclusion
Yellotec’s implementation of thermal imaging technology demonstrates how modern condition monitoring tools can transform maintenance strategies in the mining sector. By leveraging both manual inspections and continuous monitoring, operations can gain a comprehensive understanding of equipment health and act proactively.
As mining operations continue to prioritize efficiency and uptime, thermal imaging is becoming an essential tool for maintaining a competitive edge.