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  • Investigation of the machine and process engineering possibilities for the improvement of the dewatering of fine and finest-grain hard coal products


Late in 1987 a continuous pressure disk filter of 60m2 filtering surface was commissioned for the dewatering of flotation concentrate. The filter consists of 5 disks mounted to one control head. The filter cake is discharged through a twofold gate. The filter operates in a pressure range of 1.0 to 3.0 bar and at n = 0.5 to 2.5 filter disk rotation. Practical studies were accompanied by extensive tests both on a laboratory as well as on a technical scale using novel-type filtering media for vacuum or pressure filtration. The said filtering media provide a high initial capillary pressure to prevent the breakthrough of air and thus noticeably reduce air consumption as against conventional filtration. The results obtained under properly selected operational conditions are comparable to those yielded by conventional pressure filtration. Filtration tests on flotation concentrates in discontinuous filter presses have resulted in minimal residual moisture in the filter cake, provided the blowing pressure for predrying the feed material is adequate. Due to the relatively poor compression of granular feed material diaphragm compression did not turn out to be of value. Dewatering of coarsely disperse solids of a grain size between 3 and 0.5 mm in centrifuges running at centrifuge numbers beyond z = 200 has shown that any comminution of the material may severely hamper dewatering.

Additional information

Authors: LOTZIEN R, Bergbau-Forschung GmbH, Franz-Fischer-Weg 61, D-4300 Essen 13 (DE);ERDMANN W, Bergbau-Forschung GmbH, Franz-Fischer-Weg 61, D-4300 Essen 13 (DE);JUNG R, Bergbau-Forschung GmbH, Franz-Fischer-Weg 61, D-4300 Essen 13 (DE)
Bibliographic Reference: EUR 12315 DE (1989) MF, 88 pp., ECU 8, blow-up copy ECU 11.25
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