Desulfurization of Cu–Fe Alloy Obtained from Copper Slag and the Effect on Form of Copper in Alloy
Abstract
:1. Introduction
2. Experiment
2.1. Materials
2.2. Experimental Procedures
2.3. Characterization Methods
3. Results and Discussion
3.1. Desulfurization by Fe–65 wt.% Mn
3.2. Desulfurization by CaC2
3.3. Effect of Desulfurization on the Existing Form of Copper in Alloy
4. Conclusions
- (1)
- Sulfur exists in the form of Cu2S and FeS in Cu–Fe alloy, and CaO does not easily react with Cu2S. According to the thermodynamic calculation results, the Gibbs free energy values of the reaction of Mn and CaC2 with Cu2S are all negative, and the desulfurization reaction can be carried out.
- (2)
- The addition of Fe–Mn and CaC2 could remove S from Cu–Fe alloy. When the addition of Fe–Mn made the atomic ratio of Mn to S 5, the S content was decreased to 0.24%. When the atomic ratio of Mn to S was 20.8, the S content was reduced to 0.0013%. When the atomic ratio of Ca to S was 8, the content of S was reduced to 0.0079%.
- (3)
- The desulfurization reaction had an effect on the form of copper in the Cu-Fe alloy. Nano-sized copper spheres existed in the Cu–Fe alloy before and after desulfurization, and the spherical diameter became larger after desulfurization. The possible reason for this was that the liquid Cu could not wet the surface of the Fe-rich phase, and liquid copper shrank and aggregated into a spherical shape along the surface of the Fe-rich phase. As the S content decreased, the contact angle decreased and the size of nano-copper spheres expanded.
Author Contributions
Funding
Conflicts of Interest
References
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Composition | Fe | Cu | C | S | CaO | Al2O3 | SiO2 |
---|---|---|---|---|---|---|---|
Cu–Fe alloy | 88.10 | 8.02 | 1.69 | 1.23 | - | - | - |
Slag after reduced | 3.29 | - | - | 0.22 | 38.55 | 4.73 | 45.65 |
Composition | Mn | Cu | S | CaO | Al2O3 | SiO2 |
---|---|---|---|---|---|---|
Cu–Fe alloy | 1.46 | 9.51 | 0.24 | - | - | - |
Tailings | 7.84 | - | 0.90 | 55.10 | 3.14 | 30.43 |
Composition | Cu | S | Ca | Al2O3 | SiO2 |
---|---|---|---|---|---|
Cu–Fe alloy | 7.85 | 0.0079 | - | - | - |
Tailings | - | 0.95 | 43.87 | 2.67 | 25.87 |
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Zhang, B.; Feng, P.; Zhang, T. Desulfurization of Cu–Fe Alloy Obtained from Copper Slag and the Effect on Form of Copper in Alloy. Materials 2022, 15, 5110. https://doi.org/10.3390/ma15155110
Zhang B, Feng P, Zhang T. Desulfurization of Cu–Fe Alloy Obtained from Copper Slag and the Effect on Form of Copper in Alloy. Materials. 2022; 15(15):5110. https://doi.org/10.3390/ma15155110
Chicago/Turabian StyleZhang, Baojing, Peizhong Feng, and Tingan Zhang. 2022. "Desulfurization of Cu–Fe Alloy Obtained from Copper Slag and the Effect on Form of Copper in Alloy" Materials 15, no. 15: 5110. https://doi.org/10.3390/ma15155110