Primary Gravel Production at Industrial Locations

This - more or less contaminated - sandy gravel is ideal to be separated by this plant into grain classes. Normally the pollutants ad here to the fine fractions. These are washed of the coarse Stones and are dispersed in the process water, where they get filtered out as pressed sludge. So the pollutants are concentrated in the fine material.The treatment consists of a dry processing unit (mobile crushing and screening) for an optionally pre-treatment and a water-supported separation plant. After the removal of iron parts through magnet separator, the material is transported into awashing drum. Most light and floating parts are washed out in the washing drum by the counterflow principle. Cohesive soil parts disperse in the washing water. In the next step, the material reaches a double deck preliminary screen. The oversized material (> 32 mm) is falling into a crusher and could be passed into processing circuit again. The undersized grain (< 4 mm) flowsforward with the processing water. The middle fraction (4 – 32 mm) attains into a two axles logwasher. The input of mechanic energy by rotating and friction causes the cleaning of the coarse parts.