Sv. Krishnan et Sv. Sotirchos, EXPERIMENTAL AND THEORETICAL INVESTIGATION OF FACTORS AFFECTING THE DIRECT LIMESTONE-H2S REACTION, Industrial & engineering chemistry research, 33(6), 1994, pp. 1444-1453
The factors influencing the behavior of the CaCO3-H2S reaction were in
vestigated. Three types of limestones, all having high CaCO3 content (
>95 % on a mass basis) but differing in petrographic structure. were r
eacted with H2S in a thermogravimetric analysis system under noncalcin
ing conditions, that is, in the presence of enough CO2 to prevent deco
mposition of CaCO3. Experiments were carried out over a range of parti
cle size, temperature, and H2S concentration. Pore structure character
ization suggested that the particle size decreased during the reaction
. The data were analyzed using a shrinking core model, and the effecti
ve diffusivity through the product layer was found to vary significant
ly among the three solids. The obtained results were compared with rea
ctivity data reported for the same stones for the CaCO3-SO2, CaO-SO2,
and CaO-H2S reactions in past studies.