Mechanical Technology February 2016

⎪ Materials handling and minerals processing ⎪

modular coal plants. O’Bryan says that the Enduron VD dewatering screen range has been designed to ensure that maximum efficiency and lowest cost of ownership is achieved. Featuring an innovative 45° degree feed section, the Enduron screen’s feed profile effectively increases the screen- ing area and the dewatering capacities, using high feed end velocities to aid in the dewatering process. The main deck of the screen slopes upwards to maxi- mise solids retention and to dewater the cake bed. The lightweight Enduron VD dewa- tering screen is suited to applications in the sand and aggregates, and min-

JHDA and Portaclone. “Weir Minerals Africa continues to provide support for these screens and, in a number of installations, the screens have operated for in excess of 10 years without any replacements being necessary,” says Winchester Maphosa – Weir Minerals Africa product manager for comminution and screens. He explains that Weir Minerals has imple- mented a number of innovations to improve the design of the dewatering screens in order to increase the longevity and maintainability of the screens. An example he cites is the replacement of the corrosion resistant 3CR12 box deck frame design with a crossbeam and 3CR12 stringer/runner design. This has elimi- nated the downtime and production losses that previously resulted from premature deck failures due to latent welding defects. Another brand within the Linatex range from Weir Minerals recently launched in the North American coal market is the high per- formance Fusioncast ® polyurethane screen media panels. The material is designed to maximise service life through superior abrasion resistance, a critical factor in coal dewatering. The product’s properties and wear characteris- tics make it ideal for use in a number of coal applications including raw coal refuse screens and fine screening. “In field trials it was confirmed that the product exhibits wear life advantages of up to 50% when compared to injection moulded polyurethane screen media panels. This results in a significant time and cost saving for cus- tomers. Added operational flexibility is also a feature, because the product can be supplied with a wide range of openings for separations as coarse as 25 mm,” says O’Bryan An example of the success of this product is in an operation in North America’s Western Kentucky. After conducting six weeks of head to head trials between the existing continu- ous slot panels and the Fusioncast panels, the Fusioncast panels were found to have a significantly superior wear life performance. “As a result of the resounding success of the Fusioncast technology trials, the customer opted to replace the 1 100-plus panels with Fusioncast panels throughout various raw coal, clean coal and fine refuse screening ap- plications in its plant. Further leveraging the success of the trials, the company has been invited to tender on a number of screen media supply contracts, including one for some of the world’s largest coal preparation plants,” O’Bryan points out. In 2014 Weir Minerals Africa aligned its screens brand with its Enduron comminution equipment, allowing the company to provide 3.0 to 4.3 m wide screen designs for large

Enduron dewatering screens ensure maximum efficiency and lowest cost of ownership. ing and minerals processing industries and can be supplied in variations from 0.3 to 3.0 m wide. q

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Mechanical Technology — February 2016

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