VKG Kaevandused has ordered a wobbler feeder and a roll crusher for processing oil shale in the Ojamaa mine, Estonia. The machines have just passed the acceptance test in Hazemag’s production in Dülmen, Germany.
The wobbler feeder, which is connected upstream of the roll crusher, screens the fines from the feed material. The coarse material, some 250 t/h, is crushed by the roll crusher to reach the desired particle size of 0 to 125 mm.
By using the wobbler feeder as a primary screen , a smaller crusher can be used for the subsequent crushing.
The gap of the roll crusher can be infinitely varied using a hydraulic system. In case a contaminant enters the machine, the movably supported roll moves aside hydraulically, lets the contaminant pass and moves back into its preset position.
In subsequent process steps, the resulting product is used as fuel or for oil extraction.