Uhde Gmbh

Harmut Hederer

Manfred Kreft

Wolfgang Hillebrand

Bulk material containing vaporizable ingredients, such as lignite, hard coal, peat, waste wood, clarifier sludge, waste sludge, contaminated earth, catalysts, zeolites and filter cake, is conditioned by means of a vibrating plate conveyor divided into a heating section and a drying section, using an indirect heat exchange method. The bulk material is heated in an enclosed heating section while withdrawing the vapor from this section. In the downstream enclosed drying section, the vaporizable fractions contained in the bulk material are further reduced with the aid of heat supplied indirectly, the vapor being withdrawn. The bulk material is separated several times into coarse and fine fractions utilizing at least one slotted grid, the fines being immediately recycled and remixed with the coarse fractions which have a higher water content. The bulk material is mixed several times while being heated in the drying section before discharge. Substantial improvement in the conditioning of bulk material having a wide grain size distribution is achieved by adding fine-grain auxiliary material to the bulk material containing vaporizable fractions in a very early stage of the process.

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Dortmund, Germany

Harmut Hederer