Modern Mining May 2016

CRUSHING, SCREENING AND MILLING

Trio crushers show their mettle

A producer of aggregate frommine waste rock dumps is not only optimising its production in Stilfontein using its range of Trio® comminution equipment, but has also lowered its total cost of operation by entering into an extended service level agreement (SLA) with Weir Minerals Africa.

S ince replacing equipment at its two operations with Trio ® crushers and screens from Weir Minerals Africa, CNC Crushers Roadstone has en- joyed uninterrupted production, ranging from 1 000 to 1 200 tonnes of aggregate a day for road construction in various areas of North West Province. Weir Minerals Africa first entered into its long-standing business relationship with CNC Crushers Roadstone’s owner, Carl Crous, at the beginning of 2014. This is when the origi- nal equipment manufacturer (OEM) installed a Cavex ® 400CVX10 cyclone and a Warman ® WBH ® 100 centrifugal slurry pump at one of his operations, known as Shaft 5. Crous says that he was so impressed with the overall performance of the equipment that he decided to invest in a screen and two crushers from Weir Minerals Africa. Crous’ other operation, Shaft 4, is now also using a Trio ® TC series cone crusher. JD Singleton, Weir Minerals’ General Manager for Trio ® products in Africa and Middle East, says like all Trio ® equipment, the rugged design makes these crushers ideal for African mining environments. CNC Roadstone is using a Trio ® TC36SH (short head) and Trio ® TC51S (standard head) in its operations. The Trio ® TC36SH weighs 12 000 kg and has a feed opening of between 100 mm and 180 mm, as well as a head diameter of 914 mm. It has a maximum power capacity of 90 kW and a maximum capacity of between 27 t/h and 186 t/h. The Trio ® TC51S has a head diameter of 1 295 mm and weighs 22 500 kg. It has a feed opening of between 65 mm and 135 mm, and a maximum power of 200 kW. The unit has a maximum capacity of between 36 t/h and 255 t/h. Crous says he has been very impressed with the tonnages being achieved using the Trio ® cone crushers. These have exceeded the initial production requirements, leaving the operation with ample spare capacity, if it

should be required. The agg r ega t e producer’s first piece of Trio ® screening equipment was a TIO5162 inclined double deck screen. Singleton says Trio ® TIO Series screens generate their motion via three timed shafts w i t h e c c e n t r i c counter-weights. The combination of three shafts pro- vides an oval strike wi t h ad j u s t a b l e

amplitude, speed and operating angle that are determined by application, feed size and gradation. The vibrating unit uses an oil bath lubrication arrangement. The 1 560 mm by 4 880 mm Trio ® TIO5162 screen operating at CNC Roadstone weighs 6 452 kg, and is driven by a 22 kW motor at between 675 rpm and 850 rpm, screening 10 mm to 19 mm material. Weir Minerals Africa also built the mounting frame for the screen to accommodate its instal- lation in an existing footprint, while the cone crushers were installed on existing concrete plinths, with the steel adapter bases manufac- tured by the OEM, thus further reducing the capital outlay of the equipment. While the predictability and reliability of the crushers and screen are very strong selling points for Weir Minerals Africa, this opera- tion, specifically, has maximised the operation of its Trio ® comminution equipment by enter- ing into an extended service level agreement with the OEM. This agreement sees Weir Minerals Africa’s technical field service personnel spend- ing two full days a month at the operations undertaking preventative maintenance on the equipment. 

Trio TC36 short head cone crusher in a tertiary crushing application.

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May 2016  MODERN MINING  57