Our innovative Combimix process turns clay-and-rock mixtures found in quarries and gravel pits into a valuable building material and marketable product. Before development of this process, these mixtures had to be backfilled or disposed at a landfill. Furthermore, this means that millions of tons of material that used to be considered worthless, and that was dumped in the past, can now be ‘reactivated.’ This innovation makes it possible to significantly reduce the amount of clay-and-rock overburden and thus allows quarries to operate more economically. During the mixing process, binder is added to the overburden material, which reacts chemically with the clay and dries it. In the subsequent processing step, the clay is separated from the rock by means of screening. This is where the innovative Combimix system (DKXC) takes center stage. Moreover, the new process conserves limestone resources and extends the usable lifetime of quarries.
This nomination video for the German Resources Efficiency Award 2016 introduces the BHS Combimix process for processing clay-and-rock mixtures at the Mönsheim quarry operated by MSW Mineralstoffwerke Südwest.
The innovative Combimix system of type DKXC combines the advantages of the twin-shaft batch mixer (DKX) with a continuously operating mixer. With conventional continuous mixers, the short retention time is not sufficient to achieve an adequate reaction between the rock mass and the lime. The decisive advantage of this mixer is its three-dimensional mixing concept. The retention time, which is dependent on the input material, can be varied flexibly. A weight detection system ensures a constant filling level.