Key Takeaways & Executive Findings
- •• Optimal roasting conditions (850°C, 2 h, CaO-to-slag ratio 0.3) yield a vanadium leaching efficiency of 92.5%. • The activation energy of the leaching process is 45.2 kJ/mol, indicating a chemically controlled reaction. • Phase transformations during roasting and leaching were identified, providing insights into the reaction mechanism. • The study offers a theoretical foundation for improving vanadium recovery in industrial practice.
Abstract
The dissolution behavior of vanadium slag in the process of vanadium extraction using the calcium roasting–acid leaching method was systematically investigated. The effects of roasting temperature, roasting time, calcium oxide addition, and acid leaching conditions on the vanadium leaching efficiency were studied. The results show that the optimal roasting conditions are a temperature of 850°C, a roasting time of 2 h, and a CaO-to-slag mass ratio of 0.3. Under these conditions, a vanadium leaching efficiency of 92.5% can be achieved. The phase transformations during roasting and leaching were analyzed using X-ray diffraction (XRD) and scanning electron microscopy (SEM). The kinetics of the leaching process were also studied, and the activation energy was determined to be 45.2 kJ/mol. The findings provide a theoretical basis for the optimization of the vanadium extraction process.
1. Introduction
Vanadium is an important strategic metal widely used in steel, aerospace, and chemical industries. The extraction of vanadium from vanadium slag is a key process in the utilization of vanadium-bearing resources. Among various methods, the calcium roasting–acid leaching method has attracted considerable attention due to its high efficiency and environmental friendliness. However, the dissolution behavior of vanadium slag during this process is not fully understood, which limits the optimization of the process parameters.
In this study, the dissolution behavior of vanadium slag in the calcium roasting–acid leaching process was systematically investigated. The effects of key parameters such as roasting temperature, roasting time, and calcium oxide addition on the vanadium leaching efficiency were examined. The phase transformations and microstructural changes during roasting and leaching were characterized using XRD and SEM. The kinetics of the leaching process were also analyzed to determine the rate-controlling step and activation energy. The results provide valuable insights into the mechanism of vanadium extraction and offer a theoretical basis for process optimization.
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Zhang, Wei; Li, Lanjie; Wang, Xin; et al. (2026). A Study on the Dissolution Behavior of Vanadium Slag in the Process of Vanadium Extraction Using the Calcium Roasting–Acid Leaching Method. Chinese Journal of New Drugs. https://doi.org/10.1007/s12613-024-1234-5
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Frequently Asked Questions
What is the optimal roasting temperature for vanadium extraction from vanadium slag?
The optimal roasting temperature is 850°C, which yields a vanadium leaching efficiency of 92.5% when combined with a roasting time of 2 hours and a CaO-to-slag mass ratio of 0.3.
What is the activation energy of the leaching process?
The activation energy of the leaching process is determined to be 45.2 kJ/mol, indicating that the reaction is chemically controlled.
What are the key parameters affecting vanadium leaching efficiency?
The key parameters include roasting temperature, roasting time, calcium oxide addition, and acid leaching conditions. The study found that a temperature of 850°C, a roasting time of 2 hours, and a CaO-to-slag ratio of 0.3 are optimal.
What methods were used to characterize the phase transformations?
X-ray diffraction (XRD) and scanning electron microscopy (SEM) were used to analyze the phase transformations and microstructural changes during roasting and leaching.
What is the significance of this study?
This study provides a theoretical basis for optimizing the vanadium extraction process, which can improve vanadium recovery and reduce environmental impact in industrial applications.
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