A pilot scale evaluation of continuous pressure filtration was conducted on minus 200 mesh clean coal recovered by column flotation using an Andritz-Ruthner trailer mounted hyperbaric filter. Results showed that increasing vessel pressure for a given cake formation angle (CFA), increased cake thickness and throughput, while decreasing cake moisture. Baseline testing concluded that filter operating parameters-of 3 bar pressure, 1.5 rpm filter speed and 165∗ CFA produced a 15.7 mm thick cake with a cake moisture of 23.7 percent. The air consumption to achieve these results was 242 NmJ/l (452 cfm/t) and the resulting throughput was 793 kg/mVhr (163 Ib/ftVhr). Using these operating parameters, either nonionic or cationic surfactants effectively reduced cake moisture to below 20 percent at dosages as low as 0.25 kg/t. The use of flocculants increased throughput but also increased cake moisture.
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Groppo et al. (1996) studied this question.
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