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TRACE ELEMENTS IN SULPHIDE AND SULPHATE MINERALS IN COAL AND THEIR ENVIRONMENTAL IMPACT

AUTHOR/S: KOSTOVA, I.
Sunday 1 August 2010 by Libadmin2003

3rd International Scientific Conference - SGEM2003, www.sgem.org, SGEM2003 Conference Proceedings/ ISBN: 954-918181-2, June 9-13, 2003, 27- 28pp

ABSTRACT/Full article not available/

The trace elements in the main sulphide and sulphate minerals in coal
were determined. Coals with different degree of coalification (ranging from
lignite to subbituminous) from three important Bulgarian coal basins – Maritza
East, Pernik and Balkan have been investigated.
Heavy liquids and hand picking under a binocular stereomicroscope were
applied to concentrate the sulphur-bearing minerals present in coal. Trace
elements in them were detected by inductively coupled plasma – atomic
emission spectroscopy (ICP – AES) of separated fractions. Some elements
determinations were also carried out with scanning (SEM) and transmission
(TEM) electron microscopes equipped with energy dispersive X-ray analyzers.
Determination of sulphide and sulphate minerals in coal samples were
performed using optical microscopy, X-ray diffraction and SEM
(micromorphometric particle analysis).
Pyrite, marcasite and gypsum are the major sulphur-bearing minerals in
studied coals.
The trace elements presented in pyrite are Mo, Co, Ni, Cu, As, Zn, V, Cr,
Mn, Al, Pb, Ge, Sb, Ga, Si, Cd, Ca, Y, Ti, Ba, K and Bi. The elements As, Mo,
Zn, Co, Mn, Ni, Cd, Cr, Si, V, Ga and Sr have been detected in marcasite. In
gypsum were determinate the following trace elements : Sr, Mo, Mn, Fe, Yb,
Cr, V, Ga, Al, Ti, Y, Ni and K.
Some genetic and environmental conclusions related with
interdependence between the elements and the main sulphur-bearing minerals
have been done.


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