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The project by British Coal Headquarters Technical Department identifies and quantifies interactions between those unit operations involved in the conventional fine coal treatment process, froth flotation, vacuum filtration and tailings thickening. Most of the practical work concerns the effects of recycled flocculant on the flotation operation, at bench and pilot plant scale. Although interactive mechanisms are complex, it is demonstrated that superfine particles are most severely affected by the interaction. It is suggested that the dominant mechanism may involve agglomeration flotation of superfines. At the low levels of flocculant recycling which arise from the use of a conventional thickener, it is the adverse effect on the filtration of flotation concentrates that is of more practical significance than the adverse effect on the flotation operation itself. Results show that the recycled flocculant from a thickener dosed at 0.05 kg/t causes a 15% reduction in the specific filtration rate of frothed concentrate. At thickener flocculant dosages of 0.4 kg/t the filtration rate reduction amounts to 70% of that applicable when no flocculant is present in the flotation operation.

Additional information

Authors: VICKERS F, British Coal, Burton-on-Trent (GB)
Bibliographic Reference: EUR 11900 EN (1988)
Availability: (2)
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