For August Oppermann Kiesgewinnung und Vertriebs GmbH, the washing and dewatering of the water-sand mixture (0 - 2 mm) in the Northeim gravel plant in Lower Saxony is to be optimised, both in terms of efficiency and sustainability criteria.

• Optimisation and modernisation of raw material extraction and processing
• Energy and wear cost savings through modified processing technology
• Development of an efficient alternative to pumps, cyclones, dewatering screens

STICHWEH washing and dewatering bucket wheel ES 4011 BL 120

• Reduction from four large electric motors to one 15 kW motor
• Reduction of power consumption for fine sand skimming to a quarter of the previous requirement
• Increase in output from 80 - 100 tonnes of sand per hour
  to approx. 175 tonnes per hour
  at a water volume of max. 615 m³/h
• Minimisation of raw material losses
• Automatic control of the speed, adapted to the quantity supplied
• Significant savings in energy costs
  and reduction of CO2 emissions
• Cost saving for wear parts

What Marcel Salimi, AO area manager Northeim and Rosdorf, is also particularly pleased about: "We are now not only saving several engines and their consumption and repair needs. It is also a huge relief that the replacement of the worn sand pumps, which was on the agenda twice a year with the old system, is no longer necessary. The spare parts alone cost around 10,000 euros per replacement, plus the costs for the plant shutdown during the repair and the necessary labour. Fortunately, all that is now a thing of the past."

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