Modern Quarrying October-November 2015

PRODUCTS, EQUIPMENT AND SERVICES

Vibrating equipment manufacturer and supplier Joest Kwatani continues to demonstrate its capacity to provide turnkey screening solutions to the mining sector. A recent contract saw the company providing design, engineering, fabrication and delivery of a range of vibrating screens and feeders to a manga- nese mine in the Northern Cape. “Our equipment is designed specifically to per- form in heavy-duty applications such as the man- ganese sector, where in this instance the feed rate is 900 tph,” Kim Schoepflin, managing director of Joest Kwatani, says. “In this recent contract we adopted our ‘engi- neered excellence’ approach to meet specific cus- tomer specifications. None of the equipment we supplied was off-the-shelf, as the requirement was for bespoke, custom-designed elements specifically for the project. Our involvement extended to assist- ing the EPCM contractor with the underpan, feed and discharge chute designs whereby we used their lay- outs to accommodate our screens and to indicate any interference points, in addition to providing our input into good operating procedure,” Schoepflin says. Joest Kwatani’s scope of work necessitated addi- tional infrastructure to support future requirements. The company’s scope of equipment supply comprises a sizing screen, a secondary screen, a large tertiary screen, a tertiary screen counter-balance sub-frame and four silo withdrawal feeders.Schoepflin explains that the tertiary screen is one of the largest of its kind supplied into this type of application. “It will be sup- plied complete with a counter-balance frame, which isolates the structure from the dynamic and static loading forces imparted by the vibrating screen. This allows us to design vibrating equipment that is more efficient and offers the customer a longer lifespan. “An interesting fact about this customdesigned ter- tiary screen is that it has a fine cut size of high open area 0,63 mm in panels, and affords the customer the nec- essary efficiency and capacity requirements,”he says. www.joest.co.za Turnkey screening solutions

Conveyor efficiency is key Tega Industries SA is marketing a number of carefully engineered con- veyor components that are designed to address weak points on conveyors and maximise efficiency, while simultaneously increasing the lifespan of belts. According to business development and marketing manager of Tega Industries SA, Vishal Gautam, these solutions are designed to increase availability and avoid unnecessary downtime. Each one of the compo- nents was developed in response to common problems on African mines and in response to skills shortages which currently requires products to be simpler and less maintenance intensive. He says one of the biggest causes of damage to belting is at transfer points where impacts from large or heavy items can damage rollers (or impact rollers) to the extent that they may seize or begin to run unevenly. This can result in rapid wear of the belt and excessive drag on the rest of the system and will require the belt to be shut down for a lengthy period of time for repairs to be affected. “We designed the FriFlo Impact Pad system with a top layer made of UHMWPE to glide the conveyer belt over the transfer point. The middle layer cushions impacts, while the lower layer is for fastening impact pads onto the support frame (usually made of aluminium). The pad provides a large contact area that supports the belt which means that there is no under cutting and damage as is the case with rollers.” An additional system designed to eliminate spillage at transfer points is the Spill-EX skirt sealing system which, like the Fri-Flo Impact Pad, is designed to be simple. The Spill-EX system uses specially-formulated soft rubber segments to act as a skirt to seal the sides or rear of conveyors and is adjustable to ensure that each segment makes contact with the belt to form a complete seal. Equally innovative is the company’s Ceramic Pulley Lagging system that fits existing or new pulleys to provide greatly increased traction on the belt and prevent slippage even under wet and muddy conditions. “Belt slippage can cause excessive wear and tear and may even lead to the belt running unevenly or coming off the track under certain con- ditions. To combat this, our system makes use of a special traction design that has ceramic tiles with traction nubs embedded into a special rubber housing to provide better grip,” Gautam says. www.tegaindustries.com

Tega Industries has designed an impact pad system that replaces standard rollers with a solid impact bed.

The Joest Kwatani screens were customised to match the exacting metallurgical requirements of the client’s processes and the associated mechanical duty.

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MODERN QUARRYING

October - November 2015