Modern Quarrying

Sandvik Mining and Rock Technology recently supplied, installed and commissioned a CS440 secondary stage crusher at Afrimat’s Lyttelton Dolomite operation in Centurion.

SandvikAccording to Adam Taylor who is the technical sales and support specialist for Sandvik Crushing and Screening, the CS440 is the ideal machine for Lyttelton Dolomite. “Weighing in at 19,3 t with a maximum power of 220 kW, it is a large machine and it is not often that a quarry takes a crusher of this size.”

Formerly known as the S4800 cone crusher, the new unit is characterised by its large intake capability and high throughput in relation to size.

Looking at some of the benefits of the CS440 Taylor says it has a hydraulically supported main shaft that is supported at both ends. “It has a robust crusher design, adjustable eccentric throw and a constant intake opening. This crusher is ideal for any high-capacity secondary crushing operation.

“Its high performance provides the lowest total cost of the operation,” he tells MQ. “Its versatility allows full control over the crusher processes. It is reliable, and easy to maintain and handle.”
Discussing the Afrimat Lyttelton Dolomite order as a whole, he says it wasn’t the easiest of projects. “However, I believe that a lot of projects that go through teething problems often end up being the best, and this is true of this one.”

Lyttelton Dolomite mine manager Piet Ackerman agrees. “It was difficult at first, but the support we receive from Sandvik and Adam is remarkable. When it was commissioned we underestimated the capacity of the machine. It was selected for a bigger feed size and we opened up the jaw to allow a bigger feed size. But this resulted in a knock-on effect because the belt and feeders were affected. These problems have now been rectified; the crusher is phenomenal and working at the expected capacity.”

Explaining the reasons behind the purchase of such a large machine, he says the mine needed a secondary crusher. “Production wise, there was a smaller HP300 tertiary but this couldn’t handle the 300 mm oversize material and we needed to open the jaw to a 176 mm closed-side setting (CSS) to enable more production. We needed a 50% mtph from what the old crusher provided.

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