A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Reduction of acid rock drainage using steel slag in cover systems over sulfide rock waste piles
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 using Vadose/w. The solution proposed is an oxygen transport barrier that allows rain water percolation to treat the ARD in the waste rock pile. The results showed that the waste pile slope is an important factor and the cover system must have 5 m thickness to achieve an acceptable effectiveness.
Reduction of acid rock drainage using steel slag in cover systems over sulfide rock waste piles
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 using Vadose/w. The solution proposed is an oxygen transport barrier that allows rain water percolation to treat the ARD in the waste rock pile. The results showed that the waste pile slope is an important factor and the cover system must have 5 m thickness to achieve an acceptable effectiveness.
Reduction of acid rock drainage using steel slag in cover systems over sulfide rock waste piles
de Almeida, Rodrigo Pereira (author) / Leite, Adilson do Lago (author) / Borghetti Soares, Anderson (author)
Waste Management & Research ; 33 ; 353-362
2015
10 Seiten, 48 Quellen
Article (Journal)
English
Hochofenschlacke , Stahl , Sulfid , Sulfatmineral , Kontamination , Gold , Kohle , Nickel , Uran , Kupfer , Sulfidmineral , Sauerstoff , Bergbau , pH-Wert , Schmutzstoff , Sickerwasser , Bodenwasser , Regenwasser , Entwässern (Gelände)
Use of Shotcrete To Control Acid Mine Drainage In Waste Rock Piles
| British Library Conference Proceedings | 1993
Geochemical transport modelling of acid mine drainage within heterogeneous waste rock piles
| British Library Conference Proceedings | 2008
Predicting acid rock drainage in waste rock dumps
| British Library Conference Proceedings | 1997
Shotcrete as a Cementitious Cover for Acid Generating Waste Rock Piles
| British Library Conference Proceedings | 1994