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Remediation of acid generating colliery spoil using steel slag – case studies

Ghataora G. S., Ghazireh N., Hall N.

Studia Geotechnica et Mechanica

2015

Vol. 37, nr 2

75--84

One of the legacies of the coal mining industry is the existence of numerous colliery spoil mounds. Run-off waters from some of these mounds result in oxidation of sulphur compounds causing pH to drop to perhaps as low as 2.5. At this pH, mobility for metals increases and it results in destruction of both flora and fauna. In order to reduce acidity, a number of solutions have been investigated with varying degree of success. A recent study to reduce acidity in spoil run-off water included the use of Basic Oxygen Steel slag. Its slow release of lime resulted in longer term remediation compared with other techniques. In addition to this, steel slag contains elements which are essential for plant growth and can be regarded as a weak fertiliser. This was substantiated in two field trials, which had the aim of not only remediating acidity from two different types of colliery spoils, but also to develop a composition that supports grass growth. The objectives were achieved at both sites and some of the results of over 5000 chemical tests conducted during these studies are reported in this paper.

The effect of weathering of colliery spoils on water environment

Kozielska-Sroka E.

Studia Geotechnica et Mechanica

2003

Vol. 25, nr 1-2

163-169

The article presents a problem of water environment pollution caused by soluble components leaching from Carboniferous rock wastes of the Upper Silesian Coal Basin exemplified by Anna coal mine dumping ground. A relationship between the amount of pollutants leached from the colliery spoils and their stratigraphic origin and lithological composition as well as susceptibility to weathering of Carboniferous rocks constituting the spoils has been shown.