Metso Insights Case studies Mining and metals refining Revolutionizing gold production: Metso’s MDR250 pump solution boosts efficiency for a Zimbabwean mine
Mining
Oct 9, 2024

Revolutionizing gold production: Metso’s MDR250 pump solution boosts efficiency for a Zimbabwean mine

Zimbabwean mine with a monthly gold production of approximately 250 kg and proven reserves totaling 2.4 million tons faced significant challenges related to pump wear, maintenance, and overall plant availability. Metso stepped in with a solution that not only addressed these issues but also revolutionized their gold production process.

The customer, whose mine is located in Zimbabwe, plays a pivotal role in the mining industry. Their existing mill discharge pump suffered from high wear rates in its wet-end components, and lacked technical support and spare parts availability, resulting in frequent stoppages. These operational hurdles increased overhead costs, negatively impacted plant availability and limited overall production efficiency. Metso recognized this as an opportunity to enhance the customer’s gold production process.

Metso’s experts proposed the customer a solution to introduce the new MDR250 pump, specifically designed for mill discharge applications. The ongoing trial period for the pump spans for six months, with the end date set for October 2024. The pump offers a remarkable 6-month lifespan for wet-end parts, significantly reducing the need for replacements. Operating at a lower pump speed (595 rpm), it is able to achieve the required cyclone pressure while minimizing energy consumption. Special tools, including an inlet door, an impeller lifter and a shaft handler, help facilitate safe and efficient maintenance. Achieving a flowrate of 650 m³/h with a Total Dynamic Head of 33 m and cyclone feed pressure of 0.5 bar at a lower pump speed has showcased Metso’s industry expertise.

Challenge

  • High wear rate of the wet-end parts in the current competitor pump
  • Unplanned breakdowns due to pump stoppages
  • Higher OPEX (e.g higher spares consumption). Current change interval of the wet-end pump parts is 3-4 times a year, which has a negative impact on the pump/cyclone performance and plant availability.
  • HDPE mill discharge pipe wears out every two months due to abrasion and high-pressure application.

Solution

  • Mill Discharge Rubber pump MDR250 that can operate at a lower speed of 595 rpm (compared to the competitor pump which operates at 830 rpm)
  • MDR250 operating at a lower power drawn and consuming less energy
  • MDR250 pump together with Metso Trellex T40 slurry hose to improve overall mill circuit performance

Benefit

  • Pump started without any mechanical issues, achieving design flowrate and Total Dynamic Head
  • Reduced wear rate of the wet-end components
  • Increased plant availability and throughput
  • Stable cyclone efficiency operation pressure (0.45-0.55) and improved separation performance at a lower pump speed
  • No wear on the pump’s wet-end parts and slurry hose within the first three months of the trial period

Improved mill circuit performance and reduced downtime

The customer embraced Metso’s solution that led to significant improvements in performance, such as reduced pump stoppages and maintenance resulting to reduced downtime, lower energy consumption, decreased wear parts inventory, as well as enhanced safety and sustainability. The implementation of the MDR250 pump yielded stable cyclone efficiency operation pressure between 0.45-0.55, improving separation performance at a lower pump speed. Remarkably, there was no wear on the pump wet-end parts and slurry hose within the first three months of the trial period. During this period, the mine produced 126,227 tons of ore and the pump operated for 1,449 hours.

Impeller release mechanism ensures easy removal of the impeller to reduce downtime.
Impeller release mechanism ensures easy removal of the impeller to reduce downtime.

Metso’s goal is to replace competitor pumps after the trial period concludes and future business opportunities with the customer include MD pumps, slurry hoses and cluster cyclones. Metso continues to support growth and efficiency goals and be the partner of positive change.

Enjoyed this article? Try this next
Meet the solution for higher capacities in pumps
Metso MD Series pumps enable operations to pump up mineral processing flowsheets more efficiently, sustainably and cost-effectively.
Read more
Mining

Contact our sales to achieve similar results

Select your industry to open the form.
Mining
Metals refining
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.