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When coal preparation, particularly suitable for coking created considerable amounts of sludge. Most of the technological operations is taking place in water environment. Raw sludge at a time when technology was not yet at such a high level as today and emergency overflows were deposited in tailing ponds. This is practiced on coal districts in the Czech Republic and Poland. The purpose of this section was to analyze the possibility of another flotability of coal sludge deposited in settling ponds of company EKO CA...