Metso Full portfolio Grinding Optimizer
Increase efficiency and performance of your grinding circuit. Grinding Optimizer – with the RockSense on-belt rock size analyzer, MillSense charge analyzer, and PSI particle size analyzer – gives you a complete solution for optimizing your entire grinding circuit.

The system stabilizes the process, maximizes throughput, improves control of particle size, and provides accurate on-line analyses of the most critical variables.

  • Improved utilization of grinding capacity
  • Maximized process throughput
  • Reduced energy consumption
  • Higher overall equipment efficiency
  • A complete solution from one supplier
Grinding mill


The grinding process is very energy-intensive and often a bottleneck for concentrator plant capacity. Grinding is therefore considered a very beneficial target for optimization. It is critical in achieving a suitable ore feed size distribution in order to reach high grinding efficiency and throughput, especially in grinding circuits involving autogenous (AG) or semi-autogenous (SAG) mills. The investment in grinding optimization pays for itself through reduced energy costs and improved productivity.

RockSense™ system

The RockSense system is an on-line particle size analyzer system for ores moving on a conveyor belt. The system uses high-performance 3D laser imaging technology that is resistant to changes in external lighting conditions. RockSense analyzes the rock particles during normal belt movement without affecting the capacity of the conveyor belt. The excellent resolution and realistic scale of the images is achieved by combining a high resolution 3D laser scanner with a rotary encoder. RockSense provides the following analyses:

• Particle size distribution with user-definable statistical measures
• Cumulative volume flow estimation

Learn more about RockSense >

MillSense™ system

The MillSense system provides on-line analysis of the mill charge position and volume by directly measuring the charge’s toe and shoulder angles. The volumetric charge measurement has proven to be an invaluable input for mill optimization and for decreasing disturbances caused by ore changes. The MillSense sensor is directly attached to a liner bolt and uses wireless technology for both power and data transfer.

The benefits of MillSense include:

  • Higher mill availability
  • Fewer unexpected shutdowns
  • Improved mill throughput from running the mill at the optimal charge volume
  • Protection of liners
  • Improved robustness for ore hardness changes

Learn more about MillSense >

PSI® particle size analyzers

The PSI particle size analyzer is a market-leading on-line sizing system for mineral slurries. Particle size monitoring and control improve throughput and help to maintain the target grind in the grinding circuit. Additionally, it improves the downstream process by minimizing reagent consumption, increasing recoveries, and making thickening and filtration more effective. Metso offers two particle size analyzers. PSI 300i is the preferred instrument for most grinding control applications to measure P40 to P90 particle sizes ranging from 25 to 1,000 μm. PSI 500i is recommended for applications with particle sizes ranging from 0.5 to 1,000 μm.

Learn more about PSI >


Unique in the industry, Metso MillMapper™ allows your maintenance and operational personnel to extend liner life cycles, optimize liner design, prevent liner failures, optimize throughput, and improve the performance of your mill.  The MillMapper captures wear data on the entire mill offering reliable reline forecasting.  Being able to identify liner abnormalities significantly reduces unforeseen liner failures.

Learn more about MillMapper >

Standard Control System

The Standard Control System provides all control functions required for the safe operation of grinding mills and their associated lubrication systems, as well as continuously monitoring the equipment’s condition.  The system is a modular solution comprising a local control panel with a fail-safe PLC and a large full-color touchscreen interface, as well as a robust distributed I/O network and smart mill instruments and includes remote expert support.

Learn more about the Standard Control System >

Pinion Temperature Monitoring System

Our pinion temperature monitoring system (PTMS) provides precise information about the operating condition of the pinion and ring gear system by means of temperature measurements of the profile.  The pinion temperature monitoring system is available for any installed mill equipped with a pinion and ring gear. Metso offers a complete package that includes a new hatch to accommodate sensor mounting tubes, an air purge pneumatic system complete with a junction box, and thermographic camera and infrared sensors complete with a separate transmitter junction box.

Learn more about the Pinion Temperature Monitoring System >

Grinding optimization system
The Grinding optimizer with RockSense, MillSense, and PSI particle size analyzer gives you a complete solution for optimizing your entire grinding circuit.
Horizontal mill plant units
Horizontal Mill Plant Units offer complete support in grinding circuit selection, as well as execution, service and operation.
Metso case studies
How others have improved profitability and reduced risks?


{{item.Title}} {{item.FileSizeKb}} {{item.FileSizeMb}}
{{ item.Title }}
{{ item.Language }}
{{ item.FileSizeKb }}
Contact our experts to learn more!
Your information is safe. Check our privacy notice for more details.
Thank you!
We will shortly contact you. You can send a new inquiry again after 15 minutes.