Grinding Media

We offer our customers a comprehensive grinding media advisory, manufacturing and supply service. Our aim is to deliver the best value proposition to our customers by having a thorough understanding of their processing operations, business performance drivers, and developing key performance measures.

Our technical support team of experienced production metallurgists are focused on achieving the lowest possible cost per tonne of ore ground. Donhad’s trained personnel can assist in mill optimisation using our Donhad Optimiser software and other industry packages. We also have many years’ experience in mining operations around the world.

A continual programme of innovation and R & D ensures that our material usage and production processes are at the cutting edge of the industry internationally.

 

  

 

In consultation with our customers, we actively monitor and cross-correlate grinding media consumption with mill performance to reduce megawatt hours per tonne and maximise grinding efficiency.

Our manufacturing facilities utilise a continuous bar forging system with induction heating. This operation manufactures balls ranging in size from 27mm to 105mm by roll forging and SAG balls in the size range 125mm to 150mm are produced by upset forging. We also offering grinding rods for rod mill applications.

Steel chemistry and heat treatment are tailored to ball diameter and intended application to ensure each customer gets optimised mechanical integrity and wear resistance. This produces a ball which resists spalling and breakage.

 

  

 

Products

Donhad produces a range of forged steel grinding products, including the following sizes 27mm, 36mm, 52mm, 64mm, 78mm, 94mm, 105mm, 125mm, and 140mm. Donhad can also manufacture other non-standard sizes 133mm and 150mm. For SAG mill commissioning/ongoing purposes we also manufacture low carbon, low hardness products with high impact resistance and toughness.

Donhad has led the way in the development of “high carbon” products in the 52mm, 64mm, 78mm, and 125mm product categories which deliver improved wear performance over our competitors. Donhad also offers grinding rods for rod mill applications. Please contact us for more information on these products.

Donhad is also working with several research institutions and the wider industry to develop next-generation products.

 

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Product Specifications

Donhad is at the leading edge of grinding media technology. We are continually developing and improving our products, to ensure that we remain the leading supplier of grinding media globally. We look forward to and encourage you to contact your local Donhad representative for more product information.

 

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Technical Services

Donhad’s team of metallurgists work closely with customers to improve their grinding circuits. Our Donhad Optimiser software can assist with:

  • Optimal Grinding Ball Size(s) Selection
  • Initial Mill Charge Calculation
  • Mill Power Estimation
  • Mill Throughput Estimation
  • Ball Wear Rate Determination
  • SAG Mill Breakage/Wear Rate Determination
  • SAG Ball Trajectory Analysis
  • Marked Ball Wear Test (MBWT) Analysis
  • Purge Period Calculation
  • Statistical Trial Analysis

In addition, Donhad has the capability to model customer milling circuits with industry packages such as JKSimMet® and make observations. We also work with customers to administer, monitor and analyse breakage and production trials.

Donhad has a NATA accredited laboratory in Perth WA that not only performs a QA/QC function but can also conduct customer specific product testing.

For more details of our technical service capabilities please contact Donhad.

 

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