Methods for Characterization of Inorganic and Mineral Matter in Coal:  A Critical Overview

Abstract

The present state of the methods commonly used for inorganic and mineral matter characterization in coal is described and summarized. The application of various separation procedures, macroscopic observations, reflected and transmitted optical microscopy, scanning and transmission electron microscopy, X-ray diffraction, differential thermal and thermogravimetric analyses, Mössbauer spectroscopy, infrared spectroscopy, and chemical analyses are briefly discussed. A short critical overview on the advantages and limitations of the above listed methods as well as some recommendations during their utilization are also presented.

Characterization of humic acids extracted from a lignite and interpretation for the mass spectra

“…4(a), it was observed that the major elemental compositions on the surface of raw coal were C and O, with minor Al and Ca attributed to clay minerals such as kaolinite, illite, and smectite, or carbonates such as calcite and siderite. 25,26 Aer the treatment of the alkali, parts of humic acids near the surface were removed, leaving a coarse surface (Fig. 3(b)).…”

Caracterização detalhada de material de referência certificado de carvão brasileiro

“…Os constituintes inorgânicos do carvão incluem os minerais, tais como cristais, grãos e agregados de vários minerais e a matéria fluida (umidade e inclusões inorgânicas) associada com constituintes inorgânicos e orgânicos sólidos. 1 A caracterização físico-química do carvão apresenta vários desafios e a garantia da qualidade analítica dos dados é um fator muito importante em todas as etapas do ciclo de vida do carvão.…”

Coal-derived rates of atmospheric dust deposition during the Permian

“…The measure we use for these elements is the reported ash concentration generated by high temperature ashing (Vassilev and Tascon, 2003) a process that converts the elements back to oxides. Some more volatile elements are lost during high temperature ashing (Vassilev and Tascon, 2003) but the major lithophile elements are preserved.…”

“…Some more volatile elements are lost during high temperature ashing (Vassilev and Tascon, 2003) but the major lithophile elements are preserved.…”