Study on microwave acid leaching of vanadium from calcified reconstructed steel slag

doi:10.19799/j.cnki.2095-4239.2023.0134

Abstract

Abstract:

Flow batteries, which are represented by vanadium batteries, are expected to drive a battery technology breakthrough for large-scale energy storage applications owing to their long cycle life, high energy efficiency, and independent regulation of power and energy. Vanadium, which is the core element of vanadium battery electrolytes, is relatively scarce and expensive, restricting the start-up and development of the vanadium battery industry. Therefore, it is imperative to explore various vanadium resources. The majority of vanadium is produced by smelting vanadium-titanium magnetite slag. The efficient extraction of vanadium from steel slag has become the key measure for the sustainable development of the vanadium industry in our country. Herein, vanadium steel slag was used as the raw material and roasted at 1000 ℃ and an 8% calcium ratio for 3 h. Finally, the roasted slag was used as the raw material for leaching. The effects of the leaching temperature, liquid-solid ratio, leaching time, and sulfuric acid concentration on vanadium leaching were investigated by carrying out a single factor test. The leaching rates of vanadium under different conditions were calculated using the potassium permanganate-ammonium ferric sulfate titration method, and the optimal leaching parameters were determined. The results revealed that when the leaching temperature was 90 ℃, the liquid-solid ratio was 10∶1, the leaching time was 60 min, and the sulfuric acid concentration was 35%, the vanadium leaching effect was optimal, and a leaching rate of up to 80.25% was achieved. This study provides a new pathway for alleviating the vanadium resource gap, reducing the production cost of the vanadium battery industry, and accelerating the development of electrochemical energy storage devices in the country.

Key words: vanadium battery, vanadium resources, steel slag, calcification roasting, microwave, acid leaching

CLC Number:

TF 803.21

Yinuo YAN, Xueying SHAO, Jinglong LIANG, Le WANG. Study on microwave acid leaching of vanadium from calcified reconstructed steel slag[J]. Energy Storage Science and Technology, 2023, 12(5): 1461-1468.

Figures/Tables 9

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