Experimental Study on Recovery of Y by Acetic Acid Leaching from Red Mud and Solvent Extraction by P507 from Leaching Solution

被引：0
|
作者：
Zhu X. [1 ]
Wang T. [1 ]
Li W. [1 ]
机构：
[1] College of Chemistry and Chemical Eng., Henan Polytechnic Univ., Jiaozuo
来源：
Gongcheng Kexue Yu Jishu/Advanced Engineering Sciences | 2021年 / 53卷 / 04期
关键词：
Acetic acid; Leaching; Red mud; Solvent extraction; Yttrium;
D O I：
10.15961/j.jsuese.202000697
中图分类号：
学科分类号：
摘要：
Red mud is a solid waste produced in alumina smelting process and was an important secondary mineral resource, which is rich in rare metals such as Y. Selective leaching of Y from red mud by acetic acid was used to solve the problem of collective dissolution of impurity elements in the process of yttrium extraction from red mud. The effects of acetic acid concentration, liquid to solid ratio, leaching temperature and leaching time on the leaching efficiency of Y were investigated. The solvent extraction was applied to separate Y from the acid leaching solution. The effects of P507 concentration, pH value, extraction time and O/A on the extraction efficiency of Y were studied. Furthermore, XRD, SEM-EDS and thermodynamic theory of leaching and extraction were used to analyze the selective process of leaching and solvent extraction. The results showed that the leaching efficiency of Y, Al and Fe was 83%, 54% and 5%, respectively under the conditions of acetic acid solution pH value of 0.1, liquid to solid ratio of 10 mL/g, leaching temperature of 50 ℃ and leaching time of 1 h, while the Na, K and Ca in red mud were almost dissolved into the solution. Acetic acid could selectively destroy the crystal structure of cancrinite containing Na, K, Ca, Al and Si. The Gibbs free energy change of each metal oxide was less than 0, and the dissolution order was Na2O > K 2O > CaO > Y 2O3 > Al 2O3 > Fe 2O3. The extraction efficiency of Y was more than 99%, and the extraction efficiency of Al and Fe was less than 10% under the condition of P507 concentration of 5%, pH value of 0.5, extraction time of 6 min and O/A of 1:5, while the extraction efficiency of Na, K and Ca was close to 0. According to the analysis of the McCable-Thiele diagram of Y extraction, Y was further separated from impurities such as Al, Fe, Ca, Na and K by three-stage counter current extraction with P507. The stripping efficiency of Y was close to 100% and the stripping efficiency of Fe was only 29% under the conditions of sulfuric acid concentration of 8% and stripping time of 7 min, and the separation of yttrium and iron was achieved. Copyright ©2021 Advanced Engineering Sciences. All rights reserved.
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页码：240 / 246
页数：6
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