Recovery of Chromium from Slags Leachates by Electrocoagulation and Solid Product Characterization
Abstract
:1. Introduction
- Formation of coagulants by electrolytic oxidation of the anode.
- Destabilization of the contaminants, particulate suspension and breaking of emulsions.
- Aggregation of the destabilized phases to form flocks.
2. Materials and Methods
2.1. Leachates Preparation
2.2. EC Process Conditions
2.3. Methods Used for Solid Product Characterization
3. Results and Discussion
3.1. Influence of pH
3.2. Influence of Current Intensity
3.3. Influence of NaCl
- prevention of electrode passivation,
- anode corrosion agent, liberating Fe(II) ions into the solution,
- ameliorating the conductivity of the solution.
3.4. Energy Consumption of EC Process
- an optimized pH of 6,
- optimized energy consumption and presence of iron in the product requires a moderate concentration of NaCl of around 3000 mg/L,
- to maximize the Cr/Fe ratio, low current intensities (0.1–0.5 A) are needed (energy consumption is always lowered by decreasing the current intensity),
- to remove all of Cr from solution in shorter time, high current intensities (2 A) must be employed.
3.5. Real Leachates
3.6. EC solid Product Characterisation
4. Conclusions
- Electrocoagulation is an effective tool for removing chromium from the leachates by concentrating in a solid product useful in the production of chromium.
- pH value of 6 was optimal for EC procedure, due to the reduction of the experiment duration for total precipitation of Cr and thus minimization the energy consumption.Concentration of NaCl, under the same conditions of pH and current intensity, had no influence on the experiment duration. This parameter affected only the proportion of Fe in the solid product and the energy consumption during experiments.
- Application of higher current intensities (1 or 2 A) led to shortening the time of EC process necessary for the total Cr removal from solution but it led to solution overheating up to 60 °C. 100% efficiency of chromium removal was achieved for 0.5 A after 140 min and for 0.1 A after 430 min of EC process.
- Thermogravimetric analysis, XRD analysis and Mössbauer spectroscopy of solid products provided description of key product parameters in detail.
- Final EC solid products reached up to 20% of chromium in the form of substituted hematite. Initial amount of 2–5% of chromium in slags used for leachates preparation is stated for comparison.
- EC demands application of high current intensities when it is used as waste water treatment technology (solid product composition is insignificant).
- Metals recovery from secondary raw materials could be achieved by employing of low current intensities (metal concentration increases in the final solid product).
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Real Leach. Mark | c (Cr)(mg/L) | Original pH | V (HCl 1:1) Added to 100 mL of Leachate for pH Adjusting to 6 (mL) | NaCl Produced from 100 mL of Leachate (g) | G *(mS) |
---|---|---|---|---|---|
EAFS | 2191 | 12.5 | 2.36 | 0.414 | 17.37 |
EAFC | 942 | 12.6 | 1.69 | 0.416 | 12.67 |
LC FeCr | 687 | 12.6 | 1.33 | 0.333 | 9.4 |
HC FeCr | 2013 | 10.5 | 0.67 | - | 8.8 |
Sample | c (Cr) (mg/L) | I (A) | U (V) | c (NaCl) (mg/L) | Cr (g/kg) * | Fe (g/kg) * | Ratio Cr:Fe | Energy Consumption (kWh/m3) |
---|---|---|---|---|---|---|---|---|
model 1 | 1000 | 0.1 | 2.6 | 3000 | 138.9 | 384.3 | 0.3614 | 5.57 |
model 2 | 1000 | 0.5 | 8.5 | 3000 | 107.5 | 367.9 | 0.2922 | 24.65 |
model 3 | 1000 | 1 | 16 | 3000 | 95.8 | 388.3 | 0.2467 | 59.00 |
model 4 | 1000 | 2 | 25 | 3000 | 79.6 | 437.8 | 0.1818 | 107.52 |
model 5 | 1000 | 0.5 | 4 | 10,000 | 79.5 | 364.3 | 0.2182 | 13.83 |
model 6 | 1000 | 0.5 | 2.5 | 30,000 | 84.3 | 384.5 | 0.2192 | 12.98 |
model 7 | 1000 | 0.5 | 2 | 50,000 | 98.3 | 727.8 | 0.1351 | 6.76 |
EAFS | 2191 | 0.1 | 1.8 | not add. | 156.6 | 357.9 | 0.4376 | 6.64 |
EAFC | 942 | 0.1 | 1.8 | not add. | 140 | 340.6 | 0.4110 | 4.21 |
LC FeCr | 687 | 0.1 | 2.2 | not add. | 141.1 | 346.1 | 0.4077 | 3.74 |
HC FeCr | 2013 | 0.1 | 2.5 | not add. | 111.1 | 222.2 | 0.500 | 10.99 |
Sample | Fe | Cr | Cl | S | Mg | Ʃ Elem. | Balance | Total % | Ratio Cr/Fe |
---|---|---|---|---|---|---|---|---|---|
model 1 | 44.88 | 14.93 | 0.351 | 3.53 | 3.85 | 70.87 | 29.00 | 99.87 | 0.3327 |
model 1 * | 51.72 | 16.96 | 0.070 | 0.464 | 4.65 | 77.43 | 22.48 | 99.90 | 0.3279 |
EAFS | 42.31 | 15.56 | 2.05 | 1.04 | 2.98 | 72.30 | 32.87 | 99.79 | 0.3678 |
EAFS * | 46.75 | 17.39 | 0.075 | 0.988 | 4.03 | 73.77 | 27.35 | 99.84 | 0.3720 |
EAFC | 41.87 | 15.36 | 1.46 | 0.578 | 3.76 | 74.15 | 34.15 | 99.89 | 0.3668 |
EAFC * | 48.30 | 16.79 | 0.069 | 0.123 | 3.69 | 73.63 | 27.75 | 99.84 | 0.3476 |
LC FeCr | 43.20 | 15.13 | 1.53 | 0.305 | 4.22 | 74.86 | 32.58 | 99.85 | 0.3502 |
LC FeCr * | 50.97 | 17.79 | 0.084 | 0.262 | 4.19 | 74.00 | 23.34 | 99.85 | 0.3490 |
HC FeCr | 34.28 | 15.77 | 0.823 | 0.503 | 3.11 | 73.22 | 42.60 | 99.84 | 0.4600 |
HC FeCr * | 43.59 | 20.11 | 0.070 | 0.466 | 3.02 | 73.87 | 29.49 | 99.84 | 0.4613 |
Conditions | <IS> [mm/s] | <QS> [mm/s] | <Bhf> [T] |
---|---|---|---|
RT | 0.37 ± 0.02 | 0.87 ± 0.02 | - |
4.2 K | 0.47 ± 0.02 | 0.00 ± 0.02 | 46.2 ± 0.3 |
Conditions | <IS> [mm/s] | <QS> [mm/s] | <Bhf> [T] | |
---|---|---|---|---|
RT | S1 | 0.40 ± 0.02 | −0.21 ± 0.02 | 49.6 ± 0.3 |
S2 | 0.40 ± 0.02 | −0.21 ± 0.02 | 47.6 ± 0.3 | |
4.2 K | S1 | 0.48 ± 0.02 | −0.20 ± 0.02 | 52.6 ± 0.3 |
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Pikna, L.; Hezelova, M.; Morillon, A.; Algermissen, D.; Milkovic, O.; Findorak, R.; Cesnek, M.; Briancin, J. Recovery of Chromium from Slags Leachates by Electrocoagulation and Solid Product Characterization. Metals 2020, 10, 1593. https://doi.org/10.3390/met10121593
Pikna L, Hezelova M, Morillon A, Algermissen D, Milkovic O, Findorak R, Cesnek M, Briancin J. Recovery of Chromium from Slags Leachates by Electrocoagulation and Solid Product Characterization. Metals. 2020; 10(12):1593. https://doi.org/10.3390/met10121593
Chicago/Turabian StylePikna, Lubomir, Maria Hezelova, Agnieszka Morillon, David Algermissen, Ondrej Milkovic, Robert Findorak, Martin Cesnek, and Jaroslav Briancin. 2020. "Recovery of Chromium from Slags Leachates by Electrocoagulation and Solid Product Characterization" Metals 10, no. 12: 1593. https://doi.org/10.3390/met10121593