A Novel Process for Purification and Recovery of Negative Component Calcium in Vanadium-Bearing Steel Slag

The vanadium-bearing steel slag as solid waste is also one of valuable vanadium-containing resource. Recovering vanadium from the refractory steel slag is a great challenge in the world. A leaching process study using high concentration sodium hydroxide solution was proposed in this laboratory work. The effects of sodium hydroxide concentration, particle size, leaching temperature and the ratio of alkali to slag on the rate of vanadium leaching were determined and the leaching kinetics was presented. It indicates that the leaching rate is highly sensitive to the sodium hydroxide concentration and leaching temperature and increases with increasing temperature and sodium hydroxide concentration. By studying the reaction mechanisms, it was found that the dicalcium silicate, tricalcium silicate and calcium ferrited which co-exist with calcium vanadate in the vanadium-bearing steel slag were gradually exposed and reacted with NaOH media to form Na3VO4. The leaching kinetics was analyzed which indicated that the leaching rate is controlled by the chemical reaction with the apparent activation energy of 51.34 kJ/mol. On the basis of this process, the vanadium can be effectively extracted with a leaching rate of more than 80%. The leaching medium can be recycled. It is an effective and cleaner process for leaching vanadium.

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Separation and recovery of V, Ti, Fe and Ca from acidic wastewater and vanadium-bearing steel slag based on a collaborative utilization process

Separation and Purification Technology ◽

10.1016/j.seppur.2021.119335 ◽

2021 ◽

pp. 119335

Author(s):

Jinrong Ju ◽

Yali Feng ◽

Haoran Li ◽

Shunliang Liu ◽

Chenglong Xu

Keyword(s):

Steel Slag ◽

Bearing Steel ◽

Acidic Wastewater

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Vanadium extraction from roasted vanadium-bearing steel slag via pressure acid leaching

Journal of Environmental Chemical Engineering ◽

10.1016/j.jece.2021.105195 ◽

2021 ◽

Vol 9 (3) ◽

pp. 105195

Author(s):

Shugen Liu ◽

Ermao Ding ◽

Ping Ning ◽

Gang Xie ◽

Ni Yang

Keyword(s):

Steel Slag ◽

Acid Leaching ◽

Bearing Steel ◽

Vanadium Extraction ◽

Pressure Acid Leaching

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Direct Leaching of Vanadium from Vanadium-bearing Steel Slag Using NaOH Solutions: A Case Study

Mineral Processing and Extractive Metallurgy Review ◽

10.1080/08827508.2020.1762182 ◽

2020 ◽

pp. 1-11

Author(s):

Junfeng Wan ◽

Hao Du ◽

Feng Gao ◽

Shaona Wang ◽

Minglei Gao ◽

...

Keyword(s):

Steel Slag ◽

Bearing Steel ◽

Direct Leaching

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The Establishment of Thermodynamic Model for Ti Bearing Steel-Slag Reaction and Discuss

Frontiers in Materials ◽

10.3389/fmats.2021.792714 ◽

2022 ◽

Vol 8 ◽

Author(s):

Mao-Guo Zhao ◽

Xu-Feng Wang ◽

Gu-Jun Chen ◽

Sheng-Ping He

Keyword(s):

Gibbs Energy ◽

Thermodynamic Model ◽

Steel Slag ◽

Influence Factors ◽

Bearing Steel ◽

Molar Gibbs Energy ◽

Energy Change ◽

Gibbs Energy Change ◽

Mass Ratio ◽

Coexistence Theory

A thermodynamic model for seven CaO-MgO-BaO-CaF2-SiO2-Al2O3-TiO2 ladle slags based on the Ion and Molecule Coexistence theory (IMCT) is establishment and validated by the experiment results at 1873K. The calculated activity of SiO2, Al2O3 and TiO2 in the slag can be approved by the experiment results and the IMCT model used in this study is reasonable. Then the influence factors such as the mass ratio of CaO to SiO2 (C/S ratio) ranging from 1 to 10, the mass ratio of CaO to Al2O3 (C/A ratio) ranging from 1 to 2.5, TiO2 content (wt pct) ranging from 0 to 30, BaO content (wt pct) ranging from 0 to 30 are investigated based on the thermodynamic calculating results. The raise of C/S ratio, TiO2 content and BaO content in the slag can increase the molar Gibbs energy change (ΔG) of Ti reacted with SiO2 and Al2O3 or Al reacted with SiO2. The effect of C/A ratio on the molar Gibbs energy change (ΔG) of Ti reacted with SiO2 and Al2O3 or Al reacted with SiO2 was less. Finally, the slag with higher C/S ratio and TiO2 content and appropriate BaO content can weaken the reaction between Ti and SiO2 or Al2O3 in the slag.

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