Maintaining grinding efficiency and mill throughput when liners wear

O. Mejia and B. Klein

Maintaining grinding efficiency and mill throughput when liners wear, 51st Canadian Mineral Processors conference, 22-24 January 2019, Ottawa, Canada


A study was undertaken to investigate the relationship between mill liner wear and grinding energy efficiency and to assess the opportunity to control mill speed to improve energy performance as mill liner wears.

The operating work index was found to be an effective tool to identify the decrease of grinding efficiency along the liner service. The plant data show that the mill grinding efficiency as determined by monitoring the operating work index, and throughput decreases as liner wears. However, efficiency and throughput can be maintained by either changing the liner more frequently or by increasing the mill speed. Two scenarios for increasing mill throughput were analysed. The first one involves changing the liner before the efficiency drops and the second one requires increasing the mill speed from 75% to 79%. Both scenarios show financial benefits that can be used in mill operations.


Mejia (1) and B. Klein (2)

  1. Allnorth Consultants Limited, Vancouver, This email address is being protected from spambots. You need JavaScript enabled to view it.
  2. NBK Institute of Mining Engineering, Vancouver

CEEC acknowledges and thanks the CMP Society for organising the 51st Canadian Mineral Processors conference. Conference proceedings can be purchased here.