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| Effects of Polyethylene Glycol on Leaching of Weathering Crust Elution-Deposited Rare Earth Ores |
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Received:January 14, 2021
Revised:January 27, 2021
Accepted:February 01, 2021
Published Online:May 20, 2021
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| DOI：doi：10.3969/j.issn.1007-7545.2021.06.010 |
| KeyWord:polyethylene glycol; weathering crust elution-deposited rare earth ore; seepage rate; leaching |
| Author | Institution |
| Wang Hong-bo |
武汉工程大学 资源与安全工程学院 |
| Zhang Zhen-yue |
武汉工程大学资源与安全工程学院 |
| Liu De-feng |
武汉工程大学资源与安全工程学院 |
| Li Dan |
武汉工程大学资源与安全工程学院 |
| Chi Ru-an |
武汉工程大学资源与安全工程学院 |
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| Abstract: |
| In order to improve low leaching rate and reduce long leaching period of weathering crust elution-deposited rare earth ore with ammonium chloride as leaching agent, effects of polyethylene glycol with different degree of polymerization on permeability and leaching of rare earth ore were investigated by column leaching experiments. The results show that PEG400, PEG1000 and PEG4000 have good permeability during rare earth leaching. By mixing mass fraction of 2.00%PEG400, PEG1000, PEG4000 and ammonium chloride solution of 0.20 mol/L, respectively, it is found that their permeation rates in rare earth samples rise linearly with increase of hydraulic gradient according with Darcy""s law. Leaching rate of rare earth with PEG400+NH4Cl, PEG1000+NH4Cl, PEG4000+NH4Cl and NH4Cl solution is 82.61%, 89.12%, 70.67% and 88.06%, respectively. When polyethylene glycol 1000 is used as leaching aid, permeability is the biggest and permeation effect is the best. The process of adding PEG1000 compound extractant solution leaching rare earths from weathering crust elution-deposited rare earth ore meets with shrinking-core dynamical model .This study is of practical significance to improve leaching efficiency of rare earth in practical production. |
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