Improved thickening and dewatering of finest grained flotation waste
In the German hard coal mining industry, much effort is devoted to research and development of new coal preparation techniques and the development and testing of environmentally safe processes, particularly for the treatment and disposal of waste from preparation. The process combining thickening in a centrifuge with dewatering in a chamber filter press has not until now been evaluated for treatment of very fine grained (less than 0.5 mm) waste material. The aim of this project is the utilisation of such a process to improve dewatering, to reduce investment and operating costs, and to limit any negative effects of changing the flotation process. A pilot installation was built, comprising a round clarifier, a full-jacket screw centrifuge and a chamber filter press. The effect of different adjustments of the centrifuge on the throughput of solid matter in the chamber filter press was investigated. The pilot installation achieved a solid matter throughput three times higher than that with the existing technique of dewatering in the chamber filter press only. The results remain to be confirmed in an installation in commercial operation.
Bibliographic Reference: EUR 14622 DE (1993) 42 pp., MF, ECU 4
Record Number: 199310820 / Last updated on: 1994-11-29
Original language: de
Available languages: de