Optimisation of fragmentation and comminution at Boliden Mineral, Aitik Operation
Blasting is one of the main processes of mining and its results have a major impact on the mine's total economy. The result of fragmentation affects not only the mine's productivity and unit costs but also the subsequent processes of crushing and grinding in the mill.
This work will address the design of the bolasting against the optimization of the entire process of mine and concentrator, ie, maximizing throughput. Primary mills in the mill has been identified as bottlenecks in the production system, mine / concentrator, so bursting optimization focuses on maximizing the throughput of these.
To investigate the finer fragmentation increases by setting the primary mills, five test rounds shot and evaluated. Ointment has been compared against the volleys which lay directly above the previous pallet. Testsalvorna was 35% higher specific charge than is usually used. Throughput increase for the five testsalvorna became middle-eight percent.
The collective knowledge of fragmentation effects on throughput in the primary mills suggest that finer fragmentation usually results in higher throughput. Before the methodology to determine the optimal fragmentation can be used fully, needs more tests done to determine the relationship, especially a need for further testing volleys. For the development of crushing and bursting models must fragmentation measurements become more reliable.
Contact: Jenny Greberg
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