Prospective (Bio)leaching of Historical Copper Slags as an Alternative to Their Disposal
Abstract
:1. Introduction
2. Materials and Methods
2.1. Materials
2.2. Experimental Procedures
2.3. Analytical Measurements
2.3.1. Solution Chemistry
2.3.2. Mineralogical Analyses
3. Results and Discussion
3.1. Effect of Sulfuric Acid Concentration
3.1.1. Crystalline Slag
3.1.2. Amorphous Slag
3.2. Effect of Pulp Density
3.3. Silica Gel Formation
3.4. Bioleaching Efficiency
3.4.1. Crystalline Slag
3.4.2. Amorphous Slag
3.4.3. Comparison of Slag Behavior
3.5. Phase Dissolution in Bioleaching System
3.6. Economic Potential for Treatment of Historical Slags
4. Conclusions
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Sample ID | CS | AS |
---|---|---|
Major and minor elements (wt. %) | ||
SiO2 | 38.26 | 48.33 |
TiO2 | 0.58 | 0.57 |
Al2O3 | 9.29 | 11.81 |
FeO | 44.33 | 12.11 |
MnO | 0.25 | 0.49 |
MgO | 2.97 | 2.10 |
CaO | 0.68 | 17.47 |
Na2O | 0.19 | 0.21 |
K2O | 1.27 | 4.59 |
Minor and trace elements (mg kg−1) | ||
Cu | 3761 | 19,724 |
Pb | 55 | 53 |
Zn | 3628 | 587 |
Phase composition | ||
Fayalite (Fe2+2SiO4) ++ | Glass ++ | |
Glass ++ | Chalcocite (Cu2S) + | |
Hercynite (FeAl2O4) + | Quartz (SiO2) + | |
Bornite (Cu5FeS4) + | Cristobalite (SiO2) + | |
Pyrrhotite (Fe(x−1)S) + | Metallic Cu + | |
Chalcopyrite (CuFeS2) (+) |
Final pH Values in the Leachates | |||
---|---|---|---|
Solution Used as Extracting Agent | Operating Parameters | Crystalline Slag | Amorphous Slag |
Sulfuric Acid (0.1–1 M) | |||
Sulfuric acid | 0.1 M, PD: 1%, T: 48 h | 1.22 | 1.45 |
0.1 M, PD: 5%, T: 48 h | 1.31 | 1.60 | |
0.1 M, PD: 10%, T: 48 h | 1.36 | 1.68 | |
Sulfuric acid | 0.5 M, PD: 1%, T: 48 h | 0.51 | 0.56 |
0.5 M, PD: 5%, T: 48 h | 0.52 | 0.62 | |
0.5 M, PD: 10%, T: 48 h | 0.60 | 0.70 | |
Sulfuric acid | 1 M, PD: 1%, T: 48 h | 0.38 | 0.31 |
1 M, PD: 5%, T: 48 h | 0.40 | 0.35 | |
1 M, PD: 10%, T: 48 h | 0.39 | 0.36 | |
Normality Equivalent Acids (2N) | |||
Hydrochloric acid | PD: 1%, T: 48 h | 0.04 | 0.05 |
PD: 2%, T: 48 h | 0.08 | 0.17 | |
Sulfuric acid | PD: 1%, T: 48 h | 0.38 | 0.31 |
PD: 2%, T: 48 h | 0.41 | 0.40 | |
Nitric acid | PD: 1%, T: 48 h | 0.12 | 0.05 |
PD: 2%, T: 48 h | 0.11 | 0.11 | |
Citric acid | PD: 1%, T: 48 h | 1.99 | 2.03 |
PD: 2%, T: 48 h | 2.08 | 2.29 | |
Oxalic acid | PD: 1%, T: 48 h | 0.77 | 1.48 |
PD: 2%, T: 48 h | 0.80 | 2.19 | |
(Bio)leaching | |||
Growth medium (sterile) | PD: 1%, T: 21 days | 3.98 | 4.83 |
PD: 2%, T: 21 days | 3.88 | 4.65 | |
PD: 3%, T: 21 days | 3.85 | 4.60 | |
Growth medium + bacteria | PD: 1%, T: 21 days | 0.90 | 0.62 |
PD: 2%, T: 21 days | 1.15 | 0.71 | |
PD: 3%, T: 21 days | 1.43 | 0.98 |
Crystalline Slag | Amorphous Slag | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
Solution Used as Extracting Agent | Treatment with the Best Operating Parameters | Fe 0.09 $ kg−1 | Cu 6.5 $ kg−1 | Zn 2.8 $ kg−1 | Pb 2.1 $ kg−1 | Sum | Fe 0.09 $ kg−1 | Cu 6.5 $ kg−1 | Zn 2.8 $ kg−1 | Pb 2.1 $ kg−1 | Fe 0.09 $ kg−1 |
Economic Profit Dollars [$] Per Ton of Slag Treated | |||||||||||
Hydrochloric acid | PD: 1%, T: 48 h | 20.23 | 7.47 | 7.33 | 0.07 | 35.10 | 6.88 | 118.48 | 1.33 | 0.10 | 126.80 |
Sulfuric acid | PD: 1%, T: 48 h | 15.49 | 0.35 | 6.09 | 0.03 | 21.95 | 4.42 | 81.19 | 0.88 | 0.02 | 86.51 |
Nitric acid | PD: 1%, T: 48 h | 16.28 | 8.19 | 5.62 | 0.07 | 30.16 | 5.51 | 101.68 | 1.36 | 0.10 | 108.66 |
Citric acid | PD: 1%, T: 48 h | 2.76 | 4.20 | 1.41 | 0.05 | 8.42 | 7.04 | 109.51 | 1.39 | 0.11 | 118.05 |
Oxalic acid | PD: 1%, T: 48 h | 0.51 | 0.36 | 0.01 | 0.02 | 0.89 | 6.12 | 16.75 | 0.64 | 0.00 | 23.52 |
Growth medium (sterile) | PD: 1%, T: 21 days | 0.00 | 0.42 | 0.35 | 0.00 | 0.77 | 0.00 | 40.58 | 0.30 | 0.00 | 40.89 |
Growth medium + bacteria | PD: 1%, T: 21 days | 27.00 | 12.88 | 6.95 | 0.00 | 46.84 | 6.89 | 126.57 | 1.20 | 0.01 | 134.67 |
Evaluated Parameter | Chemical Treatment | Biological Treatment |
---|---|---|
Chemicals consumption during extraction | high | low |
Processing time | short | long |
Metal yield | comparable | |
Environmental impact | high | low |
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Potysz, A.; Kierczak, J. Prospective (Bio)leaching of Historical Copper Slags as an Alternative to Their Disposal. Minerals 2019, 9, 542. https://doi.org/10.3390/min9090542
Potysz A, Kierczak J. Prospective (Bio)leaching of Historical Copper Slags as an Alternative to Their Disposal. Minerals. 2019; 9(9):542. https://doi.org/10.3390/min9090542
Chicago/Turabian StylePotysz, Anna, and Jakub Kierczak. 2019. "Prospective (Bio)leaching of Historical Copper Slags as an Alternative to Their Disposal" Minerals 9, no. 9: 542. https://doi.org/10.3390/min9090542