Evaluation of limestones for the purposes of desulphurisation during the fluid combustion of brown coal

► Limestone with lower calcium content desulphurises better than limestone with higher. ► A limestone fraction with particles <0.04 mm contains the smallest amount of CaO. ► Ballast materials contained in the smallest fractions deactivate limestone calcines. ► The selection of the limestone should correspond to the character of the brown coal.