Reduction of acid rock drainage using steel slag in cover systems over sulfide rock waste piles

Waste Management & Research : the Journal of the International Solid Wastes and Public Cleansing Association, ISWA
Rodrigo Pereira de AlmeidaAnderson Borghetti Soares

Abstract

The extraction of gold, coal, nickel, uranium, copper and other earth-moving activities almost always leads to environmental damage. In metal and coal extraction, exposure of sulfide minerals to the atmosphere leads to generation of acid rock drainage (ARD) and in underground mining to acid mine drainage (AMD) due to contamination of infiltrating groundwater. This study proposes to develop a reactive cover system that inhibits infiltration of oxygen and also releases alkalinity to increase the pH of generated ARD and attenuate metal contaminants at the same time. The reactive cover system is constructed using steel slag, a waste product generated from steel industries. This study shows that this type of cover system has the potential to reduce some of the adverse effects of sulfide mine waste disposal on land. Geochemical and geotechnical characterization tests were carried out. Different proportions of sulfide mine waste and steel slag were studied in leachate extraction tests. The best proportion was 33% of steel slag in dry weight. Other tests were conducted as follows: soil consolidation, saturated permeability and soil water characteristic curve. The cover system was numerically modeled through unsaturated flux analysis us...Continue Reading

References

Mar 31, 2001·Waste Management·H Motz, J Geiseler
Apr 28, 2010·Waste Management & Research : the Journal of the International Solid Wastes and Public Cleansing Association, ISWA·Inga HerrmannLotta Lind

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