SOUTH AFRICAN TECHNOLOGY AND SERVICES
As the smallest model in the range of Bradford Breakers marketed by TAKRAF Africa, the semi-mobile version offers the benefits of the traditional breaker in a more compact machine. With affordability being a critical factor for junior and small miners, the design of the semi-mobile Bradford Breaker has been rationalised, without compromising on performance, with features such as a centralised lubrication system offered as an optional add-on
chemicals, solvents, hydrocarbons, oils and fuels, and has a chemical resistance chart that shows chemical resistance for many chemicals.
The polymer has demonstrated chemical resistance at 25 ° C to many common chemicals found in the mining sector, including sulphuric acid( 10 %), nitric acid( 10 %), petrol and diesel, among a host of other chemicals.
The manufacturer advocates its product’ s use where wear rings are exposed to water-cyanide mixtures and acid mine drainage.“ Our products are suitable for this type of application,” Simpson advises.
Vesconite wear rings, which are designed to seal the pressure leakage of the liquid between the inlet of the impeller and the pump casing, can be designed to run with smaller clearances between the ring and casing. This means a higher pumping efficiency due to a lower bypass.
and again in the coal industry for the simultaneous sizing and cleaning of raw coal.
Developed originally for the American market and its softer coal to remove impurities and contamination from feed material, the Bradford Breaker has seen incremental but far-reaching improvements over the decades by TAKRAF Africa to tailor it to the increasingly demanding conditions and difficult coal of the South African mining industry. The latest development, the semimobile Bradford Breaker, is a further demonstration of how this technology is adaptable to the evolving needs of the industry.
Essentially a rotary breaker, the Bradford Breaker consists of a large revolving cylindrical drum driven by an electric motor. As the drum rotates, lifters lift the lumps of material to a predetermined height and the material then drops, under gravity, onto the screen plates where it shatters along the natural cleavage lines. The machine is easy to maintain and repair, as it is driven from one end only by a simple drive assembly.
Vesconite wear rings should be considered for many of the horizontal split-case pumps operating in the harsh mining and metallurgical environment. This is according to Pump Bearing Consultant Charlie Simpson, who notes that the company’ s wear rings are chemically inert in many cases.
Vesconite Bearings, the maker of the thermoplastic that is machined to make the wear rings, has tested its polymer’ s chemical resistance to many mild acids, mild alkalis, organic
If the Vesconite wear ring happens to make contact with the housing no damage is caused as the wear ring will conform to the new size and reestablish a close clearance, says Simpson.
Mine power
Access to an OEM that can cover the full electrical scope of supply for mill applications is a major advantage and this is exactly what secured the Zest WEG Group the contract for the supply of an energy efficient solution to drive the mill at the Yanfolila gold mine in Mali.
Yanfolila is being developed by Hummingbird www. axxis. co. za
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JANUARY 2017 | International Mining 51