✍ Scribed by D. Carl Anderson; Andrew K. Galwey
No coin nor oath required. For personal study only.
The combustion of sulfur-containing coal particles on a calcium carbonate crystal results in retexturing of a neighbouring CaC03 (100) face. The structural modifications developed at the CaCO, crystal surface show similarities to those found after reaction of calcite in SO, and O2 (air). It is concluded that sulfur dioxide formed during coal combustion reacts extremely readily with calcium carbonate and that subsequent oxidation yields CaSO, as the stable product. Under these conditions, the crystals of the product are embedded in and oriented with respect to the reactant CaCO,. It appears that some of these reactions proceed without melting betwen 870 and 970K. Aspects of the mechanism of the overall reaction are discussed.
📜 SIMILAR VOLUMES
The significant changes of surface texture in CaCO, crystallites due to reaction in an equimolar SO,-O2 mixture were examined by scanning electron microscopy. Surface modifications were extensive above 870 K, which is close to the temperature of CaCO, dissociation and of CaSO, oxidation. It appears