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Transformation of YF3 into Y(OH)3 by a Mechanochemical Process: Extracting Yttrium from Rare Earth Smelting Slag under Mild Conditions
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2023-03-18 , DOI: 10.1021/acssuschemeng.2c06089
Yucheng Liu 1, 2 , Kaibo Hu 2 , Xiaowen Zhou 2 , Chuanqi Zhang 2 , Fang Gao 2 , Xuewei Li 2, 3 , Yinhua Wan 2, 3
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2023-03-18 , DOI: 10.1021/acssuschemeng.2c06089
Yucheng Liu 1, 2 , Kaibo Hu 2 , Xiaowen Zhou 2 , Chuanqi Zhang 2 , Fang Gao 2 , Xuewei Li 2, 3 , Yinhua Wan 2, 3
Affiliation
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The yttrium (Y) element in the calciothermic reduction YF3 smelting slag (YSS) has a recovery value, and the conventional direct alkali transformation-acid leaching method of recovering rare earth elements (REEs) from solid waste, which contains rare earth fluoride, has encountered problems of high energy and alkali consumption and low leaching rate. In this study, a green process for the transformation of YF3 to Y(OH)3 at room temperature was achieved by employing a mechanochemical method. The process is environment-friendly, with zero emission, less acid/alkali consumption, and water recyclability. It was found that YF3 will be “passivated” by a newly formed Y(OH)3 product layer under the alkaline condition, resulting in the unsustainable transformation of YF3 to Y(OH)3. However, the mechanical force could destroy the coating of Y(OH)3 and promoted the transformation of YF3 to Y(OH)3 completely; as such, the transformation efficiency of YF3 reached 98.2%. On this basis, the process of extracting Y from YSS was further studied, and the results showed that YF3 in YSS was successfully transformed into Y(OH)3 and the leaching rate of Y reached 96.2%. Therefore, it is expected to be a new technology to recover REEs from waste slag or minerals that contain rare earth fluoride and has good industrial application prospect.
中文翻译：
通过机械化学过程将 YF3 转化为 Y(OH)3：在温和条件下从稀土冶炼渣中提取钇
钙热还原YF 3冶炼渣(YSS)中的钇(Y)元素具有回收价值，常规直接碱转化-酸浸法从含稀土氟化物的固废中回收稀土元素(REEs)，遇到了能耗碱耗高、浸出率低等问题。在这项研究中，采用机械化学方法实现了在室温下将 YF 3转化为 Y(OH) 3的绿色工艺。该工艺过程环境友好，零排放，酸碱消耗少，水可循环利用。发现YF 3会被新形成的Y(OH) 3 “钝化”碱性条件下的产物层，导致YF 3向Y(OH) 3的不可持续转变。然而，机械力会破坏Y(OH) 3的包覆层，促进YF 3向Y(OH) 3的完全转变；这样，YF 3的转化效率达到了98.2%。在此基础上进一步研究了YSS的Y提取工艺，结果表明YSS中的YF 3成功转化为Y(OH) 3Y的浸出率达到96.2%。因此，从含稀土氟化物的废渣或矿物中回收稀土元素有望成为一项新技术，具有良好的工业应用前景。
更新日期：2023-03-18
中文翻译：
通过机械化学过程将 YF3 转化为 Y(OH)3：在温和条件下从稀土冶炼渣中提取钇
钙热还原YF 3冶炼渣(YSS)中的钇(Y)元素具有回收价值，常规直接碱转化-酸浸法从含稀土氟化物的固废中回收稀土元素(REEs)，遇到了能耗碱耗高、浸出率低等问题。在这项研究中，采用机械化学方法实现了在室温下将 YF 3转化为 Y(OH) 3的绿色工艺。该工艺过程环境友好，零排放，酸碱消耗少，水可循环利用。发现YF 3会被新形成的Y(OH) 3 “钝化”碱性条件下的产物层，导致YF 3向Y(OH) 3的不可持续转变。然而，机械力会破坏Y(OH) 3的包覆层，促进YF 3向Y(OH) 3的完全转变；这样，YF 3的转化效率达到了98.2%。在此基础上进一步研究了YSS的Y提取工艺，结果表明YSS中的YF 3成功转化为Y(OH) 3Y的浸出率达到96.2%。因此，从含稀土氟化物的废渣或矿物中回收稀土元素有望成为一项新技术，具有良好的工业应用前景。
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