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The microbial desulphurisation of coal changes the properties of the coal not only by reducing the sulphur content, but also by reducing the content of ash and some trace elements. Treating coal for bioremoval of pyrite in a slurry reactor results in a drastic reduction of coking quality and a slight decrease of the calorific value. The desulphurisation of coal in a multiple stage slurry reactor led to the identification of kinetic data for the process with pneumatic fluidisation of coal. The pyrite oxidation reaction was found to be well described by first order kinetics in relation to pyrite surface area concentration, if the pyrite is directly accessible for microbial attack. The measurement of oxygen consumption rates provided measurable parameters to observe microbial coal desulphurisation on a commercial scale. The hydraulic fluidisation proved to be applicable for coal desulphurisation, requiring less energy for mixing and aeration compared to pneumatic fluidisation.

Additional information

Authors: BEYER M, DMT-Gesellschaft für Forschung und Prüfung mbH, Institut für Chemische Umwelttechnologie, Essen (DE)
Bibliographic Reference: EUR 13458 EN (1991) 132 pp., MF, ECU 8
Availability: (2)
Record Number: 199110333 / Last updated on: 1994-12-02
Original language: en
Available languages: en
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