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 )) expertise - comminution |
CIRCUIT OPTIMISATION
OMC undertakes the optimisation and auditing of comminution circuits worldwide. This process can involve a site visit to analyse circuit performance through a review of production data, control philosophy and the undertaking of plant trials. A desktop study using computer modelling of provided survey data is then undertaken. Alternatively, just the desktop study can be undertaken with the client supplying the data, however the combination of site visit and desktop studying has been found to achieve the best results.
A comminution circuit optimisation typically involves a circuit audit and collection of survey data. This includes an inventory of major equipment sizes and operating conditions. Mass flows, particle size distributions, and densities for each stream are collected along with samples for ore characterisation testwork.
Considerable improvements in plant performance can often be obtained through recommended changes to the control philosophy and training of plant staff based on the preliminary audit results
Once the testwork is completed, preliminary recommendations are then made based upon analysis of the data and specific problem areas are identified. These typically include changes to:
Mill Feed Size
Control Strategy
Pulp Density
Recycle Crushing
Cyclone Configuration and Operation
Throughput
Ball Load Level and Diameter
Discharge Grate Configuration
Circulating Load
The survey data is then model fitted using a combination of HelpSAG and JK SimMet modelling techniques. Simulations are then undertaken to assess the influence of varying process parameters on the circuit performance.
>> HelpSAG is used to model the operation of each mill and assess the power efficiency of the circuit during the survey.
>> JK SimMet is used to model the circuit performance from a breakage rate, size distribution and density perspective to asses the significance of proposed plant improvements.
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