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Yun Li
Department of Chemical and Metallurgical Engineering, School of Chemical Engineering, Aalto University, 02150 Espoo, Finland

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Journal article
Published: 25 October 2020 in Minerals
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In this study, the effects of oxidizing roasting process on the liberation of cathode materials from Al foil under different conditions were investigated systematically. The mineralogical characteristics of the cathode materials before and after thermal treatment were extensively characterized using scanning electron microscopy (SEM) with energy dispersive spectroscopy (EDS), X-ray diffraction (XRD) as well as Fourier transform infrared (FT-IR) spectroscopy and X-ray photoelectron spectroscopy (XPS). The results indicated that the increase in roasting temperature, oxygen concentration, and air flow rate enhanced the liberation of cathode materials. The cathode materials were gradually oxidized to Li3Fe2(PO4)3 and Fe2O3. Further, the carbon and fluorine content in the cathode materials decreased slowly during the thermal treatment, while the Al content increased. When the roasting temperature exceeded the melting point of Al, the Al foils were ablated and the cathode materials adhered to the Al foils again, resulting in difficulty in separation. The cathode materials leaching performance test results demonstrated that the oxidation of cathode materials had a negative effect on the leaching of Fe in sulfuric acid leaching system.

ACS Style

Yafei Jie; Shenghai Yang; Yun Li; Duoqiang Zhao; Yanqing Lai; Yongming Chen. Oxidizing Roasting Behavior and Leaching Performance for the Recovery of Spent LiFePO4 Batteries. Minerals 2020, 10, 949 .

AMA Style

Yafei Jie, Shenghai Yang, Yun Li, Duoqiang Zhao, Yanqing Lai, Yongming Chen. Oxidizing Roasting Behavior and Leaching Performance for the Recovery of Spent LiFePO4 Batteries. Minerals. 2020; 10 (11):949.

Chicago/Turabian Style

Yafei Jie; Shenghai Yang; Yun Li; Duoqiang Zhao; Yanqing Lai; Yongming Chen. 2020. "Oxidizing Roasting Behavior and Leaching Performance for the Recovery of Spent LiFePO4 Batteries." Minerals 10, no. 11: 949.

Journal article
Published: 20 August 2019 in Metals
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This study proposes a cleaner lead-acid battery (LAB) paste and pyrite cinder (PyC) recycling method without excessive generation of SO2. PyCs were employed as sulfur-fixing reagents to conserve sulfur as condensed sulfides, which prevented SO2 emissions. In this work, the phase transformation mechanisms in a PbSO4-Na2CO3-Fe3O4-C reaction system were studied in detail. Furthermore, the co-treatment of spent LAB and PyCs was conducted to determine the optimal recycling conditions and to detect the influences of different processing parameters on lead recovery and sulfur fixation. In addition, a bench-scale experiment was carried out to confirm the feasibility and reliability of this novel process. The results reveal that the products were separated into three distinct layers: slag, ferrous matte, and crude lead. 98.3% of lead and 99% of silver in the feed materials were directly enriched in crude lead. Crude lead with purity of more than 98 wt.% (weight percent) was obtained by a one-step extraction. Lead contents in the produced matte and slag were below 2.7 wt.% and 0.6 wt.%, respectively. At the same time, 99.2% total sulfur was fixed and recovered.

ACS Style

Yun Li; Shenghai Yang; Pekka Taskinen; Yongming Chen; Chaobo Tang; Ari Jokilaakso. Cleaner Recycling of Spent Lead-Acid Battery Paste and Co-Treatment of Pyrite Cinder via a Reductive Sulfur-Fixing Method for Valuable Metal Recovery and Sulfur Conservation. Metals 2019, 9, 911 .

AMA Style

Yun Li, Shenghai Yang, Pekka Taskinen, Yongming Chen, Chaobo Tang, Ari Jokilaakso. Cleaner Recycling of Spent Lead-Acid Battery Paste and Co-Treatment of Pyrite Cinder via a Reductive Sulfur-Fixing Method for Valuable Metal Recovery and Sulfur Conservation. Metals. 2019; 9 (8):911.

Chicago/Turabian Style

Yun Li; Shenghai Yang; Pekka Taskinen; Yongming Chen; Chaobo Tang; Ari Jokilaakso. 2019. "Cleaner Recycling of Spent Lead-Acid Battery Paste and Co-Treatment of Pyrite Cinder via a Reductive Sulfur-Fixing Method for Valuable Metal Recovery and Sulfur Conservation." Metals 9, no. 8: 911.

Journal article
Published: 07 July 2016 in Metals
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A new process for one-step extraction of antimony in low temperature from stibnite concentrate by reductive sulfur-fixation smelting in sodium molten salt, using iron oxide as sulfur-fixing agent, was presented. The influences of molten salt addition and composition, ferric oxide dosage, smelting temperature and duration on extraction efficiency of antimony were investigated in details, respectively. The optimum conditions were determined as follows: 1.0 time stoichiometric requirement (α) of mixed sodium salt (αsalt = 1.0), WNaCl:Wsalt = 40%, αFe2O3 = 1.0, Wcoke:Wstibnite = 40%, where W represents weight, smelting at 850 °C (1123 K) for 60 min. Under the optimum conditions, the direct recovery rate of antimony can reach 91.48%, and crude antimony with a purity of 96.00% has been achieved. 95.31% of sulfur is fixed in form of FeS in the presence of iron oxide. Meanwhile, precious metals contained in stibnite concentrate are enriched and recovered comprehensively in crude antimony. In comparison to traditional antimony pyrometallurgical process, the smelting temperature of present process is reduced from 1150–1200 °C (1423–1473 K) to 850–900 °C (1123–1173 K). Sulfur obtained in stibnite is fixed in FeS which avoids SO2 emission owing to the sulfur-fixing agent. Sodium salt can be regenerated and recycled in smelting system when the molten slag is operated to filter solid residue. The solid residue is subjected to mineral dressing operation to obtain iron sulfide concentrate which can be sold directly or roasted to regenerate into iron oxide.

ACS Style

Yun Li; Yongming Chen; Haotian Xue; Chaobo Tang; Shenghai Yang; Motang Tang. One-Step Extraction of Antimony in Low Temperature from Stibnite Concentrate Using Iron Oxide as Sulfur-Fixing Agent. Metals 2016, 6, 153 .

AMA Style

Yun Li, Yongming Chen, Haotian Xue, Chaobo Tang, Shenghai Yang, Motang Tang. One-Step Extraction of Antimony in Low Temperature from Stibnite Concentrate Using Iron Oxide as Sulfur-Fixing Agent. Metals. 2016; 6 (7):153.

Chicago/Turabian Style

Yun Li; Yongming Chen; Haotian Xue; Chaobo Tang; Shenghai Yang; Motang Tang. 2016. "One-Step Extraction of Antimony in Low Temperature from Stibnite Concentrate Using Iron Oxide as Sulfur-Fixing Agent." Metals 6, no. 7: 153.