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学者姓名：旷戈
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Abstract ：
With the rapid development of lithium-ion batteries, the recycling of spent batteries represents a major future challenge, particularly LiFePO4 batteries (LFP) due to their structural stability and high safety. This study proposes a simple and efficient pretreatment process, employing a combination of ultrasonic-assisted dilute alkali leaching and crushing-gas sorting to separate the cathode and anode material from spent LFP, respectively. The key parameters that affect the recovery efficiency of cathode materials from Al foil have been determined, including alkali concentration, liquid-solid ratio, ultrasonic frequency, and ultrasonic time. The separation efficiency between Al foil and cathode material can achieved 99.85 %. The interface effect generated by the ultrasound cavitation promotes the separations of Al foil and cathode active materials. Meanwhile, the optimal crushing-gas sorting process parameters including particle size and gas flow rate was determined to recover Cu foil and graphite from the anode active material. A Cu recovery efficiency of 87.2 % with a Cu grade of 84.6 % was reached. Additionally, treatment with 3 % HCl for 90 min was introduced to remove the residual Li in the recovered graphite. This method can provide a more efficient and sustainable way for the comprehensive separation and recovery of active materials from spent lithium-ion batteries.
Keyword ：
Gas sorting Gas sorting Graphite Graphite Recycling Recycling Spent LiFePO 4 batteries Spent LiFePO 4 batteries Ultrasonic leaching Ultrasonic leaching
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| GB/T 7714 | Yang, Yakai , Zhang, Hao , Kuang, Ge et al. Ultrasonic-assisted alkali leaching coupled gas sorting process to separate cathode and anode materials from spent LiFePO4 batteries [J]. | CHEMICAL ENGINEERING AND PROCESSING-PROCESS INTENSIFICATION , 2025 , 209 . |
| MLA | Yang, Yakai et al. "Ultrasonic-assisted alkali leaching coupled gas sorting process to separate cathode and anode materials from spent LiFePO4 batteries" . | CHEMICAL ENGINEERING AND PROCESSING-PROCESS INTENSIFICATION 209 (2025) . |
| APA | Yang, Yakai , Zhang, Hao , Kuang, Ge , Li, Huan , Guo, Hui , Jin, Xing et al. Ultrasonic-assisted alkali leaching coupled gas sorting process to separate cathode and anode materials from spent LiFePO4 batteries . | CHEMICAL ENGINEERING AND PROCESSING-PROCESS INTENSIFICATION , 2025 , 209 . |
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采用空气—双氧水联合氧化工艺选择性浸出废磷酸铁锂材料（废磷酸铁锂电池正极材料粉末）中的锂，经沉锂后以碳酸锂的形式回收。实验结果表明，在液固比为4 mL/g、H_2SO_4与Li的摩尔比为0.5、搅拌转速为250r/min、反应温度为50℃的条件下空气曝气300 min，再于相同反应温度和搅拌转速下滴加H_2O_2(H_2O_2与Li的摩尔比为0.29）反应120 min，锂、铁和磷的浸出率分别为93.47%、17.26%和19.83%。该工艺较单独双氧水氧化工艺可减少75%以上的双氧水用量，大幅降低了回收成本。溶解氧浓度对浸出体系中Fe~(3+)的存在方式有重要影响：在较高浓度（通空气）下以磷酸铁为主；在较低浓度（未通空气但接触空气）下以氢氧化铁为主。
Keyword ：
废磷酸铁锂电池 废磷酸铁锂电池 碳酸锂 碳酸锂 空气氧化 空气氧化 选择性浸出 选择性浸出
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| GB/T 7714 | 刘慧勇 , 杨茜 , 傅云晗 et al. 空气—双氧水联合氧化工艺选择性浸出废磷酸铁锂材料中的锂 [J]. | 化工环保 , 2024 , 44 (02) : 235-241 . |
| MLA | 刘慧勇 et al. "空气—双氧水联合氧化工艺选择性浸出废磷酸铁锂材料中的锂" . | 化工环保 44 . 02 (2024) : 235-241 . |
| APA | 刘慧勇 , 杨茜 , 傅云晗 , 母家林 , 旷戈 . 空气—双氧水联合氧化工艺选择性浸出废磷酸铁锂材料中的锂 . | 化工环保 , 2024 , 44 (02) , 235-241 . |
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Micron-sized Si-based materials have attracted extensive attention for lithium-ion batteries due to their high theoretical capacity and low cost. However, its large volume expansion and low conductivity limit its further development. Here, a Si/ZnS anode material is prepared, in which ZnS nanoparticles are uniformly attached to the surface of micro-Si particles. The conversion reaction of ZnS generates metal Zn and Li2S, and the alloying reaction of Zn generates LixZn, the metal Zn and LixZn are used as conductive additives to improve the conductivity of the composites, while Li2S is used as an artificial solid electrolyte interfacial phase to promote the stability of the solid electrolyte interface of the composites, so that the prepared micron-sized Si-based anode exhibits excellent cycling stability. At a current density of 0.5 A g-1, the initial coulombic efficiency reaches 78.67 % and the discharge specific capacity is 1540.2 mAh g-1 after 200 cycles.
Keyword ：
Anode material Anode material lithium-ion batteries lithium-ion batteries Micron-sized silicon particles Micron-sized silicon particles ZnS ZnS
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| GB/T 7714 | Zhang, Yong , Zhang, Yijin , Deng, Qingsong et al. Improving the performance of lithium-ion batteries by micron-sized silicon particles coated with nano-ZnS anode materials [J]. | JOURNAL OF ENERGY STORAGE , 2024 , 81 . |
| MLA | Zhang, Yong et al. "Improving the performance of lithium-ion batteries by micron-sized silicon particles coated with nano-ZnS anode materials" . | JOURNAL OF ENERGY STORAGE 81 (2024) . |
| APA | Zhang, Yong , Zhang, Yijin , Deng, Qingsong , Kuang, Ge , Lin, Rongying . Improving the performance of lithium-ion batteries by micron-sized silicon particles coated with nano-ZnS anode materials . | JOURNAL OF ENERGY STORAGE , 2024 , 81 . |
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本发明公开了一种粗制碳酸锂石灰苛化碳化生产高纯碳酸锂的方法，包括步骤：1)将粗制碳酸锂加水除去可溶盐，分离的固体与水、生石灰搅拌反应，固液分离得到氢氧化锂溶液；2)浓缩；3)浓缩液中加入除杂剂搅拌反应，固液分离得到精制液；4)一部分精制液吸收二氧化碳碳化后过滤，获得碳酸氢锂溶液；5)碳酸氢锂溶液与另一部分精制液混合反应，得到高纯级碳酸锂。本发明将传统的氢氧化锂吸收二氧化碳的碳化沉锂的气—液反应过程转化成了液—液反应，可增大溶液中杂质的容忍度，结晶温和，易于控制产品纯度和粒度，不易形成杂质的包裹，减少了洗涤工序，省去了离子交换和碳酸氢锂热解的工序，使投资费用和蒸发负荷大大降低，能够实现较大利润。
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| GB/T 7714 | 旷戈 , 姜昀 , 郑芳妍 et al. 一种粗制碳酸锂石灰苛化碳化生产高纯碳酸锂的方法 : CN202111561905.2[P]. | 2021-12-20 00:00:00 . |
| MLA | 旷戈 et al. "一种粗制碳酸锂石灰苛化碳化生产高纯碳酸锂的方法" : CN202111561905.2. | 2021-12-20 00:00:00 . |
| APA | 旷戈 , 姜昀 , 郑芳妍 , 刘粤 , 李延鹤 , 刘慧勇 . 一种粗制碳酸锂石灰苛化碳化生产高纯碳酸锂的方法 : CN202111561905.2. | 2021-12-20 00:00:00 . |
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本发明公开了一种沉锂母液冷冻除芒硝回收碳酸锂的方法，包括以下步骤：1.闪蒸降温、2.碳化冷冻析晶、3.热解析锂。本发明的有益效果为 : 通过向沉锂母液中加入二氧化碳与硫酸钠，使沉锂母液中的碳酸根离子碳化后确保闪蒸与冷冻过程中由于溶液中锂浓度提高导致形成碳酸锂沉淀造成锂离子损失的现象不会发生，而且回收碳酸锂的过程仅加入了廉价的二氧化碳，回收碳酸锂过程成本低，过程简单，经济效益可观，适合工业生产。
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| GB/T 7714 | 旷戈 , 刘粤 , 李延鹤 et al. 一种沉锂母液碳化冷冻除芒硝回收碳酸锂的方法 : CN202111344132.2[P]. | 2021-11-15 00:00:00 . |
| MLA | 旷戈 et al. "一种沉锂母液碳化冷冻除芒硝回收碳酸锂的方法" : CN202111344132.2. | 2021-11-15 00:00:00 . |
| APA | 旷戈 , 刘粤 , 李延鹤 , 姜昀 , 郑芳妍 , 刘慧勇 . 一种沉锂母液碳化冷冻除芒硝回收碳酸锂的方法 : CN202111344132.2. | 2021-11-15 00:00:00 . |
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本发明公开了一种硫酸锂溶液吸附碳化制备高纯碳酸锂的方法，包括以下步骤：先将硫酸锂溶液、硫酸与偏铝酸钠浆料混合搅拌沉锂，过滤得到滤渣和滤液；再将滤渣加水配浆，并将浆液加入碳化反应槽，通入CO2气体反应，过滤得到氢氧化铝和碳酸氢锂溶液；然后将碳酸氢锂溶液进行热解获得高纯碳酸锂。本发明将硫酸锂溶液加入到铝酸钠溶液中，使Li+与Al(OH)4−反应生成LiXA1Y(OH)(3Y+X)∙nH2O复盐沉淀，进行沉锂，再经过碳化工艺除去不溶杂质、氢氧化铝、钠、硫酸根等，得到高纯级碳酸锂，不需离子交换，原料消耗少且来源广，滤渣循环利用，成本低廉，具有成本与技术经济优势。
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| GB/T 7714 | 旷戈 , 姜昀 , 刘粤 et al. 一种硫酸锂溶液吸附碳化制备高纯碳酸锂的方法 : CN202111427276.4[P]. | 2021-11-29 00:00:00 . |
| MLA | 旷戈 et al. "一种硫酸锂溶液吸附碳化制备高纯碳酸锂的方法" : CN202111427276.4. | 2021-11-29 00:00:00 . |
| APA | 旷戈 , 姜昀 , 刘粤 , 郑芳妍 , 李延鹤 , 刘慧勇 . 一种硫酸锂溶液吸附碳化制备高纯碳酸锂的方法 : CN202111427276.4. | 2021-11-29 00:00:00 . |
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The production of aluminium oxide from coal flay ash, an aluminum-rich and silicate-based solid waste, has been found uneconomic, particularly due to the great challenge for impurity removal. The present study proposes a new process to recover aluminum oxide from coal fly ash using pressure leaching with sulfuric acid, followed by crystallization and pyrolysis of potassium-alum. The thermodynamic and experimental analyses results show the feasibility of obtaining metallurgical-grade aluminum oxide using the new process, with low reagent and energy consumption. In the process, the separation of aluminum from the complicated sulfate leachate can be achieved efficiently. The excess sulfuric acid, potassium sulfate and oxy-sulfide (obtained from pyrolysis) can all be recycled for reused. The comparisons between the new process and the traditional Bayer process indicate that the new process for aluminum oxide production from aluminum-rich and silicate-based materials has a wide application. © 2022, China Science Publishing & Media Ltd. All right reserved.
Keyword ：
Alumina Alumina Aluminum oxide Aluminum oxide Aluminum sulfate Aluminum sulfate Coal Coal Coal ash Coal ash Energy utilization Energy utilization Fly ash Fly ash Potash Potash Pyrolysis Pyrolysis Sulfur compounds Sulfur compounds Sulfuric acid Sulfuric acid
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| GB/T 7714 | Wang, Peng , Liu, Hui-Yong , Huang, Hai et al. Production of aluminum oxide from coal fly ash by acidic method based on crystallization and pyrolysis of potassium-alum [J]. | Chinese Journal of Nonferrous Metals , 2022 , 32 (2) : 509-519 . |
| MLA | Wang, Peng et al. "Production of aluminum oxide from coal fly ash by acidic method based on crystallization and pyrolysis of potassium-alum" . | Chinese Journal of Nonferrous Metals 32 . 2 (2022) : 509-519 . |
| APA | Wang, Peng , Liu, Hui-Yong , Huang, Hai , Kuang, Ge , Li, Huan . Production of aluminum oxide from coal fly ash by acidic method based on crystallization and pyrolysis of potassium-alum . | Chinese Journal of Nonferrous Metals , 2022 , 32 (2) , 509-519 . |
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针对当前由粉煤灰制备氧化铝成本高、除杂难度大等问题，提出了以富铝粉煤灰为原料的硫酸加压浸取、钾明矾结晶净化、钾明矾热解生产氧化铝的新技术路线，并对关键环节进行了热力学分析和试验验证。结果表明：该技术路线可实现低物料消耗、低能耗浸出，高效地解决从复杂硫酸盐溶液中分离铝的问题，并实现了反应过程所需硫酸、硫酸钾以及过量硫酸的循环利用。通过与传统拜耳法生产氧化铝工艺对比，本文所述技术路线理论能耗和物料消耗更低、原料来源更广泛，展现了高硅富铝粉煤灰酸法生产氧化铝新工艺的广阔应用前景。
Keyword ：
氧化铝 氧化铝 热解 热解 粉煤灰 粉煤灰 酸法 酸法 钾明矾 钾明矾
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| GB/T 7714 | 王鹏 , 刘慧勇 , 黄海 et al. 基于钾明矾结晶热解的粉煤灰酸法生产氧化铝 [J]. | 中国有色金属学报 , 2022 , 32 (02) : 509-519 . |
| MLA | 王鹏 et al. "基于钾明矾结晶热解的粉煤灰酸法生产氧化铝" . | 中国有色金属学报 32 . 02 (2022) : 509-519 . |
| APA | 王鹏 , 刘慧勇 , 黄海 , 旷戈 , 李欢 . 基于钾明矾结晶热解的粉煤灰酸法生产氧化铝 . | 中国有色金属学报 , 2022 , 32 (02) , 509-519 . |
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Coal fly ash, commonly produced from thermal power plants, is not only an industrial waste but an aluminum-rich resource that needs to be disposed of properly. This study aims to extract aluminum from coal fly ash using pressurized sulfuric acid (H2SO4) leaching and to investigate the dissolution mechanism during the leaching process. The effects of initial concentration of H2SO4, reaction temperature and time on the extraction of aluminum were investigated. Under optimized conditions (3 mol/l H2SO4, 220 degrees C and 180 min), the extraction of aluminum reached 82.51%. It was found that mullite (3Al(2)O(3)center dot 2SiO(2)) contained in coal fly ash was completely dissolved during the leaching, while the dissolution of silica-alumina glass beads was at a limited degree. The un-leached aluminum was found to be locked inside the glass beads which H2SO4 was unable to access.
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| GB/T 7714 | Wang, Peng , Liu, Huiyong , Zheng, Fangyan et al. Extraction of Aluminum from Coal Fly Ash Using Pressurized Sulfuric Acid Leaching with Emphasis on Optimization and Mechanism [J]. | JOM , 2021 , 73 (9) : 2643-2651 . |
| MLA | Wang, Peng et al. "Extraction of Aluminum from Coal Fly Ash Using Pressurized Sulfuric Acid Leaching with Emphasis on Optimization and Mechanism" . | JOM 73 . 9 (2021) : 2643-2651 . |
| APA | Wang, Peng , Liu, Huiyong , Zheng, Fangyan , Liu, Yue , Kuang, Ge , Deng, Rongdong et al. Extraction of Aluminum from Coal Fly Ash Using Pressurized Sulfuric Acid Leaching with Emphasis on Optimization and Mechanism . | JOM , 2021 , 73 (9) , 2643-2651 . |
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Considering that 2%-8% F contained in lepidolite, an improved sulfuric acid method with introducing fluorine additives has been proposed to enhance its lithium extraction. Herein, an acid mixture of hydrofluoric acid and sulfuric acid (HF/H2SO4) was employed to theoretically investigate the dissolution mechanism due to that the HF molecules are the real reactive components of the fluorine additives. A stepwise heat treatment for fluorine removal has been proposed based on the different boiling point of HF-H2O and H2SO4-H2O subsystems of the acid leaching solution. Effects of heating temperature (200 degrees C-350 degrees C), heating time (6 h, 12 h), initial ratio of ore/H2SO4 (1:1.5-1:3.5 g/mL) and different heating style (one step or stepwise) on fluorine removal and lithium recovery have been carried out. Based on the elemental and composition analysis of liquid and corresponding solid phase, an optimal condition for fluorine removal was established: about 0.68% fluorine remained in leaching slurry after the stepwise heat treatment at 120 degrees C for 3 h and 200 degrees C for 6 h with initial ratio ore/HF/H2SO4 of 1:2:2 g/mL. The retention of Li was remained at a relatively high level as 94.26%. The resulted siliceous residues and undissolved quartz indicates that selective leaching of Li was achieved during this stepwise heat treatment, which is beneficial for subsequent purification and lithium production.
Keyword ：
Fluorine removal Fluorine removal Hydrofluoric acid Hydrofluoric acid Lepidolite Lepidolite Lithium extraction Lithium extraction Stepwise heat treatment Stepwise heat treatment
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| GB/T 7714 | Guo, Hui , Lv, Menghua , Kuang, Ge et al. Stepwise heat treatment for fluorine removal on selective leachability of Li from lepidolite using HF/H2SO4 as lixiviant [J]. | SEPARATION AND PURIFICATION TECHNOLOGY , 2021 , 259 . |
| MLA | Guo, Hui et al. "Stepwise heat treatment for fluorine removal on selective leachability of Li from lepidolite using HF/H2SO4 as lixiviant" . | SEPARATION AND PURIFICATION TECHNOLOGY 259 (2021) . |
| APA | Guo, Hui , Lv, Menghua , Kuang, Ge , Cao, Yijun , Wang, Haidong . Stepwise heat treatment for fluorine removal on selective leachability of Li from lepidolite using HF/H2SO4 as lixiviant . | SEPARATION AND PURIFICATION TECHNOLOGY , 2021 , 259 . |
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