Pilot-scale evaluation of hyperbaric filtration of ultra fine clean coal

J. G. Groppo, B. K. Parekh

Research output: Contribution to journalArticlepeer-review

10 Scopus citations


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 Nm3/t (452 cfm/t) and the resulting throughput was 793 kg/m2/hr (163 1b/ft2/hr). 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.

Original languageEnglish
Pages (from-to)61-70
Number of pages10
JournalCoal Preparation
Issue number1-2
StatePublished - 1996


  • Coal
  • Dewatering
  • Flocculants
  • Moisture
  • Pressure filtration
  • Surfactants

ASJC Scopus subject areas

  • Fuel Technology
  • Geotechnical Engineering and Engineering Geology


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