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Optimum flocculation in the preparation of coal can only be achieved if the results of basic research are applicable to commercial-scale operation. The experimental equipment and analysis routines devised in the course of this project closely reflect commercial operating conditions. The main project tasks were: (i) long-duration testing of a washing-water thickener, in order to establish an initial data set; (ii) a parameter study of flocculation; (iii) investigation into the influence of flow conditions; (iv) investigation into the influence of combined flocculation with anionic and cationic flocculants on sedimentation and filtration. The conditions were created for carrying out laboratory-scale flocculation followed by sedimentation or filtration under defined conditions. With the equipment and measurement techniques used it was possible to identify a number of ways in which commercial-scale flocculation can be made more effective. The results form a basis for optimising commercial-scale flocculation conditions.

Additional information

Authors: KAISER M, CEC Bruxelles (BE)
Bibliographic Reference: EUR 14621 DE (1993) 75 pp., MF, ECU 4
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