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Forms of rare earth loss and the function mechanism of acetic acid in the aluminum removal process of rare earth leaching liquor
Minerals Engineering ( IF 4.9 ) Pub Date : 2024-11-02 , DOI: 10.1016/j.mineng.2024.109081
Chen Xin, Chen Jin-fa, Xiao Xin-lei, Fan Lin, Xiao Yan-fei, Huang Li

The leaching liquor extracted from ion-adsorption type rare earth (RE) ores contains large amounts of aluminum (Al) ions. The neutralization-precipitation method for Al removal results in the loss of large amounts of RE, leading to the waste of RE resources. Preliminary research has shown that the introduction of acetic acid (HAc) during the Al removal process could effectively reduce RE loss. However, there has been no in-depth study on the forms of RE loss during the Al removal process with the neutralization-precipitation method and the function mechanism of HAc. In this paper, the yttrium element was used as a representation of RE for relevant research. It was found that the forms of RE loss mainly include adsorption loss and coprecipitation loss, and the addition of HAc can simultaneously reduce both types of loss. The addition of HAc can generate Y(Ac)2+ and Y(Ac)2+ complexes with Y3+, leading to an increase in the initial precipitation pH of yttrium hydroxide from 6.62 to 6.87, thereby reducing the coprecipitation loss of RE. Additionally, HAc was adsorbed on the aluminum hydroxide (Al(OH)3), which increased the surface potential and decreased the specific surface area of Al(OH)3, thus reducing the adsorption loss of RE. Finally, through precipitation experiments on a mixed solution of aluminum sulfate and yttrium sulfate, it was found that when the neutralization pH was 5.2, the percentage of yttrium lost decreased from 18.91 % to 12.66 % as the concentration of HAc was increased from 0 to 0.012 mol/L. The above function mechanism of HAc was further verified through XPS, SEM-EDS, and other tests on the precipitate.

中文翻译:


稀土流失形式及醋酸在稀土浸出液脱铝过程中的作用机理



从离子吸附型稀土 (RE) 矿石中提取的浸出液含有大量的铝 (Al) 离子。用于去除 Al 的中和沉淀方法会导致大量 RE 的损失,从而导致 RE 资源的浪费。初步研究表明,在 Al 去除过程中引入乙酸 (HAc) 可以有效减少 RE 损失。然而,目前尚未深入研究 Al 去除过程中 RE 损失的形式以及 HAc 的功能机制。在本文中,钇元素被用作相关研究的 RE 表示。研究发现,RE 损失的形式主要包括吸附损失和共沉淀损失,HAc 的加入可以同时减少这两种类型的损失。HAc 的添加可与 Y3+ 生成 Y(Ac)2+ 和 Y(Ac)2+ 络合物,导致氢氧化钇的初始沉淀 pH 值从 6.62 增加到 6.87,从而减少 RE 的共沉淀损失。此外,HAc 吸附在氢氧化铝 (Al(OH)3) 上,这增加了表面电位并降低了 Al(OH)3 的比表面积,从而降低了 RE 的吸附损失。最后,通过对硫酸铝和硫酸钇混合溶液的沉淀实验发现,当中和 pH 值为 5.2 时,随着 HAc 浓度从 0 增加到 0.012 mol/L,钇损失百分比从 18.91 % 下降到 12.66 %。通过对沉淀物的 XPS、SEM-EDS 和其他测试进一步验证了 HAc 的上述功能机制。
更新日期:2024-11-02
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