35. Quantification of calcium in coal with every chemical forms

Abstract

Inorganic constituents in coal are classified into two parts; mineral matter and organically associated cation. The leaching of coal with ammonium acetate is widely used to remove organically associated cation and leave discrete mineral matter intact. In this study, we carried out the leaching of coal with several kinds of solvents to know whether the leaching with ammonium acetate or other solvents can remove only the organically associated cation. It is found that not only organically associated cation but also calcite was removed by the leaching with ammonium acetate.