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| Assisted Leaching Process of Weathered Crust Elution-Deposited Rare Earth Ore by Carbamide |
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Received:November 16, 2021
Revised:November 23, 2021
Accepted:November 29, 2021
Published Online:March 15, 2022
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| DOI：doi：10.3969/j.issn.1007-7545.2022.04.013 |
| KeyWord:carbamide; leaching aid; weathered crust elution-deposited rare earths ore; response surface methodology |
| Author | Institution |
| LIU Hui-zheng |
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 |
| CHI Ru-an |
武汉工程大学，资源与安全工程学院 |
| LONG Fei |
武汉工程大学，资源与安全工程学院 |
| CHEN Wen-dou |
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 |
| Chen Zhuo |
武汉工程大学，资源与安全工程学院 |
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| Abstract: |
| Leaching of rare earth from weathered crust elution-deposited rare earth ore with carbamide as leaching aid was studied. In-situ leaching process was simulated by column leaching. Based on single factor experiment, a quadratic multinomial mathematical model was established by response surface method. Taking leaching rate of rare earth as the response value, effects of carbamide concentration, leaching temperature and pH value of leaching agent solution on rare earth leaching rate were investigated, and the interaction between the factors was analyzed. The results show that the sequence of factors affect leaching rate of rare earth from strong to weak is pH value of leaching agent solution, carbamide concentration, and leaching temperature. When ammonium acetate concentration is 0.10 mol/L, the response value of rare earth extraction rate is 97.50% under the optimum condition including carbamide concentration of 0.59 mol/L, leaching temperature of 25.03 ℃, and pH value of leaching agent solution of 5.51. The actual experimental results show that the leaching rate of rare earth is 96.36%. The errors are small, which indicates that the process parameters obtained by response surface model is basically reliable. |
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