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| Study of Leaching of Rare Earth from Weathered Crust Elution Deposited Rare Earth Ores with Mixed Ammonium Salt |
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Received:February 22, 2014
Revised:February 25, 2014
Accepted:February 27, 2014
Published Online:July 21, 2014
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| DOI：doi：10.3969/j.issn.1007-7545.2014.08.008 |
| KeyWord:weathered crust elution deposited rare earth ores; leaching; mixed ammonium salts; expansivity |
| Author | Institution |
| ZhangTingting |
武汉工程大学 绿色化工过程教育部重点实验室 湖北省新型反应器与绿色化学工艺重点实验室 |
| ZhangZhenyue |
武汉工程大学 绿色化工过程教育部重点实验室 湖北省新型反应器与绿色化学工艺重点实验室 |
| XuZhigao |
武汉工程大学 绿色化工过程教育部重点实验室 湖北省新型反应器与绿色化学工艺重点实验室 |
| LiQiong |
武汉工程大学 绿色化工过程教育部重点实验室 湖北省新型反应器与绿色化学工艺重点实验室 |
| ChiRu'an |
武汉工程大学 绿色化工过程教育部重点实验室 湖北省新型反应器与绿色化学工艺重点实验室 |
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| Abstract: |
| The effects of ratio and concentration of mixed ammonium salts (ammonium chloride and ammonium nitrate), ratio of liquid to solid (L/S), pH, and flow rate on leaching rate of rare earth(RE) from weathered crust elution deposited rare earth ores were investigated by column leaching method. The results show that RE can be leached by mixed ammonium salts with higher RE leaching rate and preferably anti-swelling of clay minerals. Leaching rate of RE is 96.29% and linear expansivity of clay minerals is 2.738% under the optimum conditions including mass ratio of leaching agent of NH4Cl∶NH4NO3 of 8∶2, concentration of leaching agent of 10 g/L, pH value of 4.0, L/S=2∶1, and flow rate of 0.5 mL/min. |
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