Enrichment of Limestone Used in the Desulphurisation of Fluidised-Bed-Boiler Flue Gases

Table 2

(a) Detailed composition of base raw substances [wt. %]

Oxides	Substance A: limestone	Substance B: Sorbacal SP	Substance C: Sorbacal H90
CaO	70.70	80.20	81.20
MgO	0.374	0.533	0.573
SiO2	0.138	0.071	0.080
Al2O3	0.091	0.036	0.050
Fe2O3	0.052	0.058	0.066
SrO	0.041	0.036	0.040
P2O5	0.037	0.017	0.017
SO3	0.023	0.137	0.112
K2O	0.018	0.008	0.011
MnO	0.007	0.011	0.013

(b) Detailed composition of calcined substances [wt. %, calcination at 850°C]

Oxides	Substance A: limestone	Substance B: Sorbacal SP	Substance C: Sorbacal H90
CaO	98.291	98.901	98.802
MgO	0.478	0.657	0.697
SiO2	0.466	0.880	0.970
Al2O3	0.283	0.450	0.600
Fe2O3	0.191	0.720	0.820
SrO	0.039	0.450	0.490
P2O5	0.016	0.200	0.200
SO3	0.029	0.169	0.136
K2O	0.020	0.099	0.130
MnO	0.023	0.140	0.160