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:: Weir Minerals says Enduron HPGRs Crush the Competition
Weir Minerals says its range of Enduron® high pressure grinding rolls (HPGR) make for the perfect pebble crushers, offering highly efficient reduction and generating substantial amounts of fines that reduce the energy required for downstream milling.
These units also reduce water and energy consumption, two resources that miners are actively looking at within their operations.
In the company’s June quarter results, Weir noted that it had seen strong demand for its Enduron HPGR technology, adding that the company had been contracted to support a large greenfield development in the UK in the period.
Whether recirculated through primary milling or separated and sent to a dedicated downstream pebble mill, pebble crushing is an energy-intensive operation that ties up a site’s limited resources, Weir says.
“With their high throughput and capacity for dealing with competent ores, HPGRs make ideal pebble crushers,” the company said. The Enduron HPGR’s low operating costs (owing to its long component wear life and low specific energy requirements) makes it a competitive inclusion in pebble crushing circuits, offering short payback times, according to the company.
Ranging in size from 25-90 mm, pebbles are oversized material produced from autogenous and semi-autogenous grinding, which are too coarse to be crushed by larger lumps of ore and steel balls and too fine to act as grinding media themselves.
As such, pebbles (or critical particle size material) reduce the efficiency of any mill they’re returned to, increasing power consumption and decreasing throughput, Weir says.
When pebbles comprise a large proportion of a (S)AG mill’s feed as they’re returned multiple times, the proportion of large particles which have the power to crush with the force of their impact is reduced and new particles are instead subjected to additional attrition and abrasion. “This can over-grind fines, producing unsuitable ultra-fines,” Weir says.
Regardless of whether they’re receiving feed directly from an upstream SAG mill or further reducing pebbles that have passed through a dedicated cone crusher, HPGRs offer highly efficient reduction, generating substantial amounts of fines that reduce the energy required for downstream milling, Weir says.
“The fineness of products is one of the key compromises in conventional pebble circuits, with pebble crushers unable to maintain high throughput without sacrificing the proportion of well reduced particles.”
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