Coal Treatment and Desulfurization

  • H. Pollak
  • J. G. Stevens

Abstract

Pyrite, an impurity commonly found in coal, will react with air to form sulfur oxides, which are poisonous to humans and can cause severe damage to industrial equipment. Because of the relatively high percentage of pyrite found in many coals, it is necessary to treat coal to satisfy environmental regulations. Mössbauer spectroscopy can be effectively used to monitor the pyrite and other iron sulfides through various coal treatment processes.

Mechanical treatment of coal, such as froth flotation and float-sink Separation, is today the most commonly used procedure. For pulverized coal, it is possible to use magnetic desulfurization in which pyrite is transformed into pyrrhotite. This enhances the magnetic susceptibility of the inorganic sulfur containing material.

Other treatment processes include several chemical methods and biological leaching, which still needs development, but is very promising. One of the chemical methods is the Meyer’s process, TWR, and is perhaps the best because it recycles the chemical, it does not require fine crushing of the coal, and sulfur removal is very efficient.

Keywords

Clay Sulfide Steam Calcite Shale 

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Copyright information

© Plenum Press, New York 1986

Authors and Affiliations

  • H. Pollak
    • 1
  • J. G. Stevens
    • 2
  1. 1.Physics DepartmentUniversity of KinshasaKinshasa XIZaire
  2. 2.Mössbauer Effect Data CenterUniversity of North CarolinaAshevilleUSA

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