Hydrometallurgical recovery of vanadium and calcium from electric arc furnace slag in hydrogen based steelmaking

IF 4.9 2区工程技术 Q1 ENGINEERING, CHEMICAL

Minerals Engineering Pub Date : 2024-09-05 DOI:10.1016/j.mineng.2024.108966

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Abstract

A two-stage direct leaching method has been applied to selectively recover calcium (Ca) and vanadium (V) from electric arc furnace slag obtained from pilot-scale smelting of hydrogen-reduced iron. Nitric acid-ammonium nitrate-water (HNO₃-NH₄NO₃-H₂O) medium was used in the first stage to produce leachate in which Ca and magnesium (Mg) composed over 99 wt% of the dissolved elements. Sodium carbonate-sodium hydroxide-water (Na₂CO₃-NaOH-H₂O) and ammonium carbonate-water ((NH₄)₂CO₃-H₂O) were investigated as alternative media for the V leaching stage. The effects of the medium composition, temperature, and liquid-to-solid ratio on element recoveries and selectivity were studied for both stages with the aid of experimental designs. Regression models were fitted that could adequately reproduce the general trends in the data and allowed the optimization of the process within the studied variable space. Under optimum conditions, 55 % Ca was recovered with 91 % selectivity. In the subsequent V leaching stage, (NH₄)₂CO₃-H₂O proved to be a more promising medium, achieving V recovery of 39 % and selectivity of 90 % under the optimum conditions.

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氢基炼钢中从电弧炉炉渣中回收钒和钙的湿法冶金技术

采用两阶段直接浸出法从试验规模的氢还原铁冶炼过程中获得的电弧炉炉渣中选择性地回收钙（Ca）和钒（V）。第一阶段使用硝酸-硝酸铵-水（HNO3-NH4NO3-H2O）介质产生浸出液，其中钙和镁（Mg）占溶解元素的 99% 以上。碳酸钠-氢氧化钠-水（Na2CO3-NaOH-H2O）和碳酸铵-水（(NH4)2CO3-H2O）作为第五浸出阶段的替代介质进行了研究。借助实验设计，研究了两个阶段的介质成分、温度和液固比对元素回收率和选择性的影响。拟合出的回归模型能够充分再现数据的总体趋势，并能在所研究的变量空间内优化工艺。在最佳条件下，钙的回收率为 55%，选择性为 91%。在随后的钒浸出阶段，(NH4)2CO3-H2O 被证明是一种更有前途的介质，在最佳条件下，钒的回收率为 39%，选择性为 90%。

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来源期刊

Minerals Engineering 工程技术-工程：化工

CiteScore

8.70

自引率

18.80%

发文量

519

审稿时长

81 days

期刊介绍： The purpose of the journal is to provide for the rapid publication of topical papers featuring the latest developments in the allied fields of mineral processing and extractive metallurgy. Its wide ranging coverage of research and practical (operating) topics includes physical separation methods, such as comminution, flotation concentration and dewatering, chemical methods such as bio-, hydro-, and electro-metallurgy, analytical techniques, process control, simulation and instrumentation, and mineralogical aspects of processing. Environmental issues, particularly those pertaining to sustainable development, will also be strongly covered.