Mechanisms at Different pH for Stabilization of Arsenic in Mine Tailings Using Steelmaking Slag
Abstract
:1. Introduction
2. Materials and Experimental Methods
2.1. Preparation of MTs and Steel Slags
2.2. Batch Experiments for Investigating the Mechanism of As Removal by the Steel Slags
2.3. Batch Extraction Experiment for the Efficiency of As-Extraction Reduction from MTs by Steel Slag
3. Results and Discussion
3.1. Evaluation of the Characteristics of the MTs and Steel Slags
3.2. Batch Experiments for Investigating the Mechanism of Arsenic Removal by Steel Slag
3.3. Batch Extraction Experiment for the Efficiency of As-Extraction Reduction from MTs by Steel Slag
4. Conclusions
Author Contributions
Funding
Conflicts of Interest
References
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Material Type | pH | Component Portion from XRF Analysis (wt.%) | ||||||||
---|---|---|---|---|---|---|---|---|---|---|
SiO2 | Al2O3 | K2O | Fe2O3 | MgO | MnO | CaO | P2O5 | SO3 | ||
MTs | 5.5 | 76.5 | 12.8 | 5.4 | 2.6 | 1.3 | - | 0.6 | 0.4 | - |
Ca-slag | 12.4 | 13.1 | 2.0 | - | 26.6 | 5.8 | 3.1 | 46.9 | 0.2 | 0.8 |
Fe-slag | 8.4 | 29.7 | 12.1 | - | 24.3 | 4.3 | 6.7 | 19.3 | - | 0.6 |
Material Type | Concentration (mg/kg) | ||||
---|---|---|---|---|---|
Zn | Cu | As | Cd | Pb | |
MTs | 133.2 | 33.0 | 2225.3 | 3.5 | 39.6 |
Ca-slag | 3.1 | - | - | - | 5.1 |
Fe-slag | 222.2 | 172.7 | - | - | 97.9 |
KSPWL at Area 3 | 2000 | 2000 | 200 | 700 | 700 |
Type of Steel Slag | Leaching Test Type | Concentration (mg/L) | ||||
---|---|---|---|---|---|---|
Zn | Cu | As | Cd | Pb | ||
Ca-slag | TCLP | DL | DL | DL | DL | DL |
SPLP | DL | DL | DL | DL | DL | |
Fe-slag | TCLP | 4.545 | 0.024 | DL | DL | 0.107 |
SPLP | DL | 0.005 | DL | DL | DL | |
Extraction Tolerance Limit | 3 | 1.5 | 0.3 | 3 |
Steel Slag Type | The pH before the Reaction | The pH after the Reaction | Initial As Concentration (mg/L) | As Concentration after the Reaction (mg/L) | As Removal Efficiency (%) |
---|---|---|---|---|---|
Ca-slag | 4.0 | 12.2 | 100.0 | 3.0 | 97.0 |
5.5 | 12.3 | 2.1 | 97.9 | ||
Fe-slag | 4.0 | 8.2 | 100.0 | 21.3 | 78.7 |
5.5 | 8.4 | 20.4 | 79.6 |
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Kim, T.; Kim, S.; Tak, H.; Kim, K.; Chung, C.-W.; Lee, M. Mechanisms at Different pH for Stabilization of Arsenic in Mine Tailings Using Steelmaking Slag. Minerals 2020, 10, 900. https://doi.org/10.3390/min10100900
Kim T, Kim S, Tak H, Kim K, Chung C-W, Lee M. Mechanisms at Different pH for Stabilization of Arsenic in Mine Tailings Using Steelmaking Slag. Minerals. 2020; 10(10):900. https://doi.org/10.3390/min10100900
Chicago/Turabian StyleKim, Taehyoung, Seonhee Kim, Hyunji Tak, Kyeongtae Kim, Chul-Woo Chung, and Minhee Lee. 2020. "Mechanisms at Different pH for Stabilization of Arsenic in Mine Tailings Using Steelmaking Slag" Minerals 10, no. 10: 900. https://doi.org/10.3390/min10100900