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Harmless and efficient nickel enrichment from nickel-containing waste slag using vitrification technology
Yaoyu Yan1,2, Shuchen Sun3,4, Kaichun Yang1,2
1School of Metallurgy, Northeastern University, ShenyangLiaoning, 110819, China.
Environmental Science and Pollution Research International
|January 29, 2025
Summary
This study presents a novel method for recovering metallic nickel and producing nickel-iron alloys from scrap. The optimized process achieves high nickel recovery (98.46%) and creates stable ferro-nickel alloy with environmental benefits.
Area of Science:
- Metallurgical Engineering
- Materials Science
- Environmental Science
Background:
- Increasing demand for nickel in stainless steel and battery sectors.
- Conventional nickel extraction methods face high costs and environmental issues.
- Need for sustainable methods to utilize nickel-bearing scrap and waste.
Purpose of the Study:
- To develop an efficient process for recovering metallic nickel from nickel-bearing scrap.
- To produce nickel-iron alloys from the same scrap material.
- To ensure environmental safety and economic viability in nickel recovery.
Main Methods:
- Optimization of roasting parameters (temperature, time, C/O ratio) using Response Surface Methodology (RSM).
- Investigating reduction rates of nickel and iron oxides.
- Conducting melt experiments on reduced materials to study Ni-Fe particle aggregation.
- Combining reduction melting with vitrification for slag treatment.
Main Results:
- Achieved 98.46% metallic nickel recovery.
- Produced nickel-iron alloy with approximately 24.61 wt% nickel content.
- Developed a glass slag with low nickel content, dense amorphous structure, and good environmental stability.
- Demonstrated spontaneous aggregation of Ni-Fe particles driven by Gibbs free energy change.
Conclusions:
- The study successfully developed a new technical method for comprehensive utilization of nickel-containing waste slag.
- Efficient recovery of metallic nickel and production of ferro-nickel alloy were achieved.
- The process offers significant environmental and economic benefits, addressing challenges in conventional nickel extraction.
Keywords:
Nickel-containing waste slagNickel–iron alloysPyrometallurgyResource recyclingResponse surface methodologyMore Related Videos
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