New double-deck post screening unit in operation
Limestone is crushed at the Robion quarry. The material is very soft, fine and tends to create dust. It is also sticky, especially in the winter when the weather is damp – which can be a challenge for the crushing and screening process. The new acquisition, which is used in the limestone quarry, includes a MOBIREX MR 110i EVO2 impact crusher with a double-deck post screening unit and the MOBISCREEN MSC 953i EVO classifying screening plant. With this combination, a large number of different products can be processed: In the pre-screening stage, a grain size of 0–30 mm or 0–63 mm is separated from the 0–400 mm feed material.
Immediately following the crushing process, the 22–50 mm grain size, which is used for various industrial lime applications, is discharged through the MR 110i EVO2’s double-deck post screen. The 0–22 mm mineral mixture is conveyed to the screening plant, the oversize grain larger than 50 mm remains in the MR 110i EVO2’s closed circuit and goes through the crushing process again. The triple-deck screening plant separates 0–22 mm into four classified final grain sizes: The 0–4 mm, 6–16 mm and 16–22 mm fractions are used directly for concrete production, while 4–6 mm is used for various underground engineering applications.
The two machines are intelligently linked, which ensures a stable process thanks to automatic control. The connection also guarantees safety: If an emergency stop is pressed on one of the machines, both are safely stopped.
