With several quarries and recycling yards around Leeds, Mone Brothers Ltd. looks back on a long tradition in mineral processing. Since its foundation in 1965, the company has rapidly developed from a pure construction equipment rental business to one of West Yorkshire’s leading suppliers of construction materials and recycling services. At minute intervals, dump trucks roll onto the almost 2.5 ha Fireclay recycling yard, bringing construction waste from demolition work and construction sites and taking broken material and material freed of foreign matter back with them. On average, over 300 000 t of this material is processed here every year. While the broken bricks are processed into hard stone gravel according to the British standard 6F2 and are mainly used as a gravel base layer in road construction, the recycled concrete broken bricks are used as an even higher quality type 1 frost protection layer.
Typically, these products are produced in the United Kingdom with jaw crushers, of which Mone Bros. Ltd. also still have one from KLEEMANN in use in their quarry – the decision in favour of an impact crusher was nevertheless made for good reason. Firstly, according to Michael Coleman, Managing Director of Mone Bros. Ltd. the product quality has increased significantly. In one crushing stage, the impact crusher creates a grain shape that a jaw crusher cannot reach without a second crushing stage. The slightly higher proportion of fines helps to bind the material in later use and therefore corresponds to the required quantity. In addition to the product quality, the higher performance of the MOBIREX also stands out. While jaw crushers in recycling applications offer a recommended crushing ratio of 7:1, impact crushers achieve a ratio of 15:1, thus enabling a higher task size and considerably higher output. “The performance is really fantastic and a real asset to our business,” says Michael Coleman, Managing Director, Mone Brothers Ltd, “so it’s easy to see why Mone Bros. Ltd. replaced two of their jaw crushers with one impact crusher. This reduced the already low operating costs due to the diesel-direct electric drive concept of the KLEEMANN EVO crushers by another 15 %.