xix
FIGURE 6.11 A justification for the need of search for “green” methods of metal recovery. ....
........................................................................................................................... 198
FIGURE 7.1 Evolution of pH throughout the experiment with
A. thiooxidans (A-D) and
P. fluorescens (E-F). ..................................................................................................... 209
FIGURE 7.2 The release of metals from crystalline slag in the experiment with
A. thiooxidans. .............................................................................................................. 211
FIGURE 7.3 The release of metals from amorphous slag in the experiment with
A. thiooxidans. .............................................................................................................. 212
FIGURE 7.4 The release of metals from crystalline slag in the experiment with
P. fluorescens. ............................................................................................................... 214
FIGURE 7.5 The release of metals from amorphous slag in the experiment with
P. fluorescens. ............................................................................................................... 215
FIGURE 7.6 SEM images of CS grains after abiotic (A) and biotic leaching (B-C) with
A. thiooxidans. .............................................................................................................. 217
FIGURE 7.7 SEM images of AS grains after abiotic (A1 and A2) and biotic leaching (B1-C2)
with
A. thiooxidans. ...................................................................................................... 218
FIGURE 7.8 SEM images of slag grains resulting from the leaching with
P. fluorescens. .. 219
FIGURE 7.9 Extraction yields achieved in the experiments with
A. thiooxidans. ................ 220
FIGURE 7.10 Extraction yields achieved in the experiments with
P. fluorescens. ............... 225
FIGURE 8.1 Life-cycle of metallurgical slag including the ultimate stages to be undertaken
prior implementing the final management strategy. ..................................................... 233
FIGURE 8.2 Overview of the experimental work carried out in the frame of PhD activity. 234
FIGURE 8.3 Summary of chemical and phase composition of individual slags. .................. 235
FIGURE 8.4 Concentrations of metals extracted from slags exposed at pH 2 (24 h). .......... 236
FIGURE 8.5 Industrial approaches regarding slag management applied formerly and
nowadays and consequences faced. .............................................................................. 238
FIGURE 8.6 Slags buried in soil. ........................................................................................... 238
FIGURE 8.7 Summary of the data obtained from the experiments simulating soil weathering
scenario. ........................................................................................................................ 239
FIGURE 8.8 Results of the study considering bio-weathering scenario. ............................... 243
FIGURE 8.9 Crucial results of the bioleaching experiments carried out with A: CS and B: GS.
........................................................................................................................... 245
FIGURE 8.10 Ultimate stages to be passed through prior to implement metal recovery. ..... 252
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