| 氟化稀土熔盐电解渣硫酸浸出脱氟研究 |
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| 引用本文： | 徐家聪,喻小强,吴选高,龚傲,徐志峰,田磊.氟化稀土熔盐电解渣硫酸浸出脱氟研究[J].有色金属科学与工程,2020,11(6):1-9. |
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| 作者姓名： | 徐家聪 喻小强 吴选高 龚傲 徐志峰 田磊 |
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| 作者单位： | 江西理工大学绿色冶金与过程强化研究所，江西 赣州 341000 |
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| 基金项目： | 国家自然科学基金;国家重点实验室开放基金;江西省自然科学基金;江西省重点研发计划重点项目;江西省博士后科研项目;中国博士后科学基金 |
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| 摘 要： | 氟化稀土熔盐电解渣不仅是稀土回收的重要二次资源，而且氟的回收利用也非常重要。本研究采用硫酸浸出法处理氟化稀土熔盐电解渣，使氟与稀土分离，并通过多级吸收将生成的氟化氢回收。研究了浸出温度、液固比、浸出时间、硫酸浓度对脱氟率的影响。结果表明:在浸出温度为360 ℃、液固比（体积与质量之比，单位为mL/g，下同）为2:1、粒度58~75 μm、搅拌转速恒定为300 r/min，反应3 h的条件下，氟的脱除率可达到95.28%，达到氟回收的目的。最后，通过对实验数据进行因次分析，得出氟脱除率的准数方程。
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| 关 键 词： | 稀土熔盐电解渣 硫酸浸出 氟回收 因次分析 |
| 收稿时间： | 2020-07-06 |
Defluorination of sulfuric acid leaching of fluorinated rare earth molten salt electrolytic residue |
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| Affiliation: | Institute of Green Metallurgy and Process Intensification, Jiangxi University of Science and Technology, Ganzhou 341000, Jiangxi, China |
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| Abstract: | Rare earth fluoride molten salt electrolytic slag is not only an important secondary resource for rare earth recovery, but also very important for fluorine recovery and utilization. In this study, sulfuric acid leaching method was used to treat rare earth fluoride molten salt electrolytic slag to separate fluorine from rare earth, and the generated hydrogen fluoride was recovered by multistage absorption. The effects of leaching temperature, liquid-solid ratio, leaching time and sulfuric acid concentration on defluorination rate were studied. The results showed that under the conditions of leaching temperature of 360 ℃, liquid-solid ratio of 2:1, particle size of 58~75 μm, constant stirring speed of 300 r/min, and reaction for 3 h, the removal rate of fluorine could reach 95.28%, achieving the purpose of fluorine recovery. Finally, through the dimensional analysis of experimental data, the standard number equation of fluorine removal rate is obtained. |
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