Determining the Bond Efficiency of Industrial Grinding Circuits

This guideline is for measuring comminution efficiency in global mine operations using the Bond method and comprehensive Bond Work Index. This method allows personnel to quantify and compare relative energy efficiencies and offers a mode of benchmarking to observe energy consumption. It is an essential tool for managing the important business (cost) of grinding.  The guideline first presents the method for Bond Efficiency determination, which applies to most brittle materials in their naturally occurring (unscalped) size distributions being treated in size reduction circuits down to an 80% passing size of the circuit product (P80) of approximately 70 µm. It then outlines the equipment and procedures for rod mill, ball mill, and impact crushing bond work index testing.