PETER LIND1, KEVIN MURRAY1, ALAN BOYLSTON2, & ISAIAS ARCE2
Mineral processing consumes significant power, primarily in comminution, as well as significant amounts of water through hold-up in conventional tailings facilities. Reducing power and water consumption in comminution circuits can contribute to reduced operating costs and improved sustainability. Metso and Newmont Goldcorp have been working on alternative comminution circuits that are both energy-efficient and present the possibility for using less fresh water as compared to conventional comminution circuits.
Comminution testwork from a recent project was used to simulate circuits that consider the use of Metso’s HRC™ HPGRs in novel ways. Configurations evaluated for the HRC™ crushers include direct recycle, dry screening, dry open-circuit ball milling and air classification. Sensor-based sorting, dry grinding, and classification, along with coarse flotation, have the potential to reduce overall water consumption.
Specific energy and water consumption in the novel circuits are compared against a traditional SABC circuit.
Comminution, energy efficiency, water consumption, HPGR, stirred milling, ore sorting, dry processing