Characterization of Some Pakistani Coals

Abstract

Four Pakistani coal samples, in pulverized and screened form, were subjected to density separation, using a series of liquids of various densities, to obtain sink–float fractions. These fractions were extracted with ammonium acetate solution. The virgin, as well as the residual, sink–float fractions were ashed and the ashes were dissolved in an acid mixture. The solutions were analyzed for identification of Cu, Mn, Zn, Fe, Ca and Mg (combined), Na, and K. Some of these elements were found to be associated with float fractions. However, a considerable amount has been found to be concentrated in sink fractions. The results also show that substantial amounts of the elements have been leached with ammonium acetate solution, which indicate their organic affinity. It is inferred, from the results, that density separation can be effectively used for the removal of inorganic elements from these coals. The method also provides a basis to study the organically based elements.

Keywords:

• Inorganic elements
• Sink and float
• Organically based elements
• Coal

Acknowledgment

We thank the National Science and Research Development Board (NSRDB) Islamabad for financial support.