Cement & Concrete Hercules Trommels in South Africa
Stelex Construction Equipment of Whitchurch, Shropshire, manufacturer of heavy-duty, Trommel screens, has recently shipped two of its heavy duty type 182 Hercules machines for two customers in southern Africa, to improve the efficiency of its cement production.
One operator quarrying limestone for cement production had, over the years, experienced heavy clay contamination with this as-dug material and was forced to separate the contaminated rock containing clays to form a waste tip, which grew to approximately 1.5 million tonnes. The Stelex Trommel will be used to clean this waste material to recover the good rock for further processing, thereby increasing the company’s efficiency and production levels.
The feed hopper is made of abrasive resistance steel to provide high wear resistance and can accommodate 100 tonnes. A variable speed-reciprocating tray, which is supported on rollers beneath the hopper, feeds material into the barrel at a pre- programmed rate. The 1.8 m diameter barrel (made up of four 2 metre long segments) is manufactured from high-grade steel bars welded to form segments, which are bolted together. The apertures are made to suit individual customer requirements. The barrel is carried on four steel rollers, two of which are driven by heavy duty, variable speed, hydraulic motors, which allows the barrel speed to be matched to the optimum feed rate of the material.
The dirt or clays in the feed are discharged through the barrel segments whilst the clean rock travels down to be graded by the different apertures in the segments. Oversize, which can be lump sizes of 900 mm, is discharged through the end of the barrel. Both machines are mounted off the ground to allow for materials to discharge below. One unit is mounted on concrete walls, and supplied with a feeder/collecting conveyor. The other on a pre-built steel skid frame and legs with chutes under the first 4 metre sections for sized product separation. With limited reserves to quarry the trommels will be an important addition to boost the cement making process for both customers.
For more information visit:
www.herculestrommels.co.uk
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August 2010 • Solids & Bulk Handling 11
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