The Rate and the Mechanism of the Reactions of Hydrogen Sulfide with the Basic Minerals in Coal

The inorganic matter i n coal can be c lass i f ied into three groups of minerals according t o t h e i r reactions w i t h hydrogen sulfide ( H S ) : (1) basic minerals, (2) minerals w i t h c a t a ly t i c ac t iv i ty , and f 3 ) i ne r t minerals. In the range of temperatures 200-90OoC, most of the minerals a re ine r t o r have a s l i gh t ca t a ly t i c ac t iv i ty on the r a t e of decomposition of H2S. However, the basic minerals react w i t h H2S and the corresponding sulfides a re formed. category a re c a l c i t e (tr igonal CaCO ), aragonite (orthorhombic CaC03), dolomite (CaCO3.MgCO3), s i d r i t e (Fe803), and t o some extent montmorilonite (clay) (Attar, 1977).