Zementwerk Leube GmbH

Installation of an innovative mobile crusher system to significantly cut down haulage costs and emissions Zementwerk Leube GmbH is annually mining approximately 450.000 mt of limestone in their Ofenauerberg quarry. Due to very high quality requirements the materials haulage in the quarry is set up in an extensive way. Up to now the haulage occurs with big wheel loaders and heavy duty vehicles like dump trucks. In the year 2009 Leube installed an innovative mobile crusher system with several mobile conveyor belts to considerably cut down haulage costs. The system consists of a very compact feeder breaker crusher which can be charged directly with a wheel loader. Due to the comparable low height of the crusher no ramps are needed. This enables a very flexible and fast repositioning of the crusher which ensures considerably lower haul distances. The crusher is equipped with a roller screen to reduce fines and increase throughput. The comminuted material is then conveyed via several self propelled mobile conveyor belts to a secondary crusher. It is possible to align these conveyor belts very fast and flexible. The crusher is completely electrically driven and is supported with electrical current via easy pluggable cables which are mounted inside of the mobile conveyor belt frames. The electrical power support significantly reduces operating costs and emissions. The system applied in the Ofenauerberg quarry of LEUBE can be applied in most of small to medium sized quarries. The investment costs are almost the same as a typical fleet of haulage equipment used in a quarry. By using such a system it is possible to cut down haulage costs approximately to one third in comparison to the use of dump trucks and wheel loaders. In case of the Ofenauerberg quarry it is expected that the annual operating hours of the transport vehicles will be reduced from ca. 6.000 h/a down to ca. 3.500 h/a. This means the annual fuel consumption will be reduced by ca. 60.000 liter diesel which saves approximately 40% of the CO2 emissions compared to the previous situation.