The Effect of Different Magnetic Separation Procedures of a Korean VTM Ore on Combined Pyro-hydrometallurgical Vanadium Recovery Behavior

IF 1.5 4区 工程技术 Q3 METALLURGY & METALLURGICAL ENGINEERING
Rina Kim, Yuik Eom, Yeongjin Ahn, Kyeong Woo Chung, Sujeong Lee, Min-seuk Kim, Byunghun Go, Hong-In Kim, Ho-Seok Jeon
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Abstract

The study focused on the recovery of vanadium from a Korean vanadium-bearing titaniferous magnetite (VTM) ore, examining the behaviors of magnetic separation and Na2CO3 roasting-water leaching. Two concentrates were prepared using single-stage dry magnetic separation and three-step wet magnetic separation, resulting in V2O5 grades of 0.8% and 1.0% and major gangue mineral SiO2 contents of 6.5% and 1.7%, respectively. These concentrates were subsequently roasted at 1050 °C with the addition of Na2CO3 and then water-leached at 25 °C. Various stoichiometric ratios of V2O5 to Na2CO3 were tested, ranging from 1:1 to 1:40 of the theoretically required amount. As the amount of Na2CO3 increased, the vanadium leaching efficiency showed fluctuations between 4 and 35% for ratios of 1:1 to 1:10, while it linearly increased from 4 to 82% for ratios of 1:10 to 1:40 in the leaching of the low-grade concentrate. In contrast, the leaching efficiency increased from 47 to 74% for ratios of 1:1 to 1:8 and then sharply rose to 84% at a ratio of 1:10 in the leaching of the high-grade concentrate. Subsequently, it reached a plateau of 92 to 94% for ratios of 1:20 to 1:40. The difference in leaching efficiency was primarily due to the reaction of gangue minerals with Na2CO3, which hindered vanadium leaching from the VTM concentrates. This hindrance was notably more pronounced in the low-grade concentrate with the lower salt ratio, as the gangue minerals exhibited a preference for consuming Na2CO3 over vanadium. The mineral formation was analyzed in detail using XRD and MLA to shed light on the mechanism of different vanadium leaching behavior depending on the concentrate grade and vanadium to salt ratio. Based on the results of this study, it is evident that applying a proper magnetic separation procedure is significant to achieving satisfactory vanadium recovery with less salt amount by removing gangue minerals ahead.

Abstract Image

韩国钒钛矿石的不同磁选程序对火法-湿法冶金联合提钒行为的影响
该研究侧重于从韩国含钒钛磁铁矿(VTM)中回收钒,考察了磁选和 Na2CO3 焙烧-水浸出的行为。采用单级干式磁选和三步湿式磁选制备了两种精矿,其V2O5品位分别为0.8%和1.0%,主要煤矸石矿物SiO2含量分别为6.5%和1.7%。这些精矿随后在加入 Na2CO3 的情况下在 1050 °C 下进行焙烧,然后在 25 °C 下进行水浸。测试了 V2O5 与 Na2CO3 的各种化学计量比,从理论需要量的 1:1 到 1:40。随着 Na2CO3 含量的增加,在低品位精矿的浸出过程中,1:1 至 1:10 比例的钒浸出效率在 4% 至 35% 之间波动,而 1:10 至 1:40 比例的钒浸出效率则在 4% 至 82% 之间线性增加。相反,在浸出高品位精矿时,比例为 1:1 至 1:8 的浸出效率从 47% 上升到 74%,比例为 1:10 时,浸出效率急剧上升到 84%。随后,当比例为 1:20 至 1:40 时,浸出效率达到 92% 至 94%。浸出效率的差异主要是由于煤矸石矿物与 Na2CO3 的反应,阻碍了 VTM 精矿中钒的浸出。这种阻碍在盐比较低的低品位精矿中更为明显,因为煤矸石矿物表现出更喜欢消耗 Na2CO3 而不是钒。利用 XRD 和 MLA 对矿物的形成进行了详细分析,以揭示根据精矿品位和钒盐比不同的钒浸出行为的机理。根据这项研究的结果,可以明显看出,采用适当的磁选程序,通过提前去除矸石矿物,以较少的盐量获得令人满意的钒回收率是非常重要的。
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来源期刊
Mining, Metallurgy & Exploration
Mining, Metallurgy & Exploration Materials Science-Materials Chemistry
CiteScore
3.50
自引率
10.50%
发文量
177
期刊介绍: The aim of this international peer-reviewed journal of the Society for Mining, Metallurgy & Exploration (SME) is to provide a broad-based forum for the exchange of real-world and theoretical knowledge from academia, government and industry that is pertinent to mining, mineral/metallurgical processing, exploration and other fields served by the Society. The journal publishes high-quality original research publications, in-depth special review articles, reviews of state-of-the-art and innovative technologies and industry methodologies, communications of work of topical and emerging interest, and other works that enhance understanding on both the fundamental and practical levels.
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