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| Migration Law and Regulation of Fine Particles during Leaching of Ion-adsorption-type Rare Earth Ore |
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Received:November 23, 2021
Revised:December 03, 2021
Accepted:December 07, 2021
Published Online:March 15, 2022
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| DOI：doi：10.3969/j.issn.1007-7545.2022.04.012 |
| KeyWord:ion-adsorption-type rare earth ore; fine particles; migration law; optimization regulation |
| Author | Institution |
| ZHOU He-peng |
江西省矿冶环境污染控制重点实验室 |
| XIE Fan-xin |
江西省矿冶环境污染控制重点实验室 |
| ZHANG Zhen-yue |
绿色化工过程教育部重点实验室 |
| LI Yun-qiang |
江西省矿冶环境污染控制重点实验室 |
| GUO Jiang-feng |
江西省矿冶环境污染控制重点实验室 |
| ZHANG Yong-bing |
江西省矿冶环境污染控制重点实验室 |
| LUO Xina-ping |
江西省矿冶环境污染控制重点实验室 |
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| Abstract: |
| The hydration mechanism between leaching agent and ore surface is complex during leaching of ion-adsorption-type rare earth ore. The bridge cementation between particles is easy to fracture due to variety forces and dispersion during ion adsorption and exchange, so that the fine particles migrate and rearrange, and precipitate at the pore throat to produce blockage. It affects leaching efficiency of ion-adsorption-type rare earth. In order to reveal the migration law of fine particles during in-situ leaching of ion-adsorption-type rare earth ore and find appropriate control methods, typical ion-adsorption-type rare earth ore in Longnan was taken as the research object to investigate effects of leaching agent concentration, viscosity, flow velocity, hydraulic gradient, ore body height and ore body moisture content on migration of fine particles by laboratory column leaching method. The results show that migration of fine particles in ionic rare earth ore is one of the important factors affecting leaching efficiency. Under the action of external force, fine particles are easy to migrate with leaching agent during leaching. When mass concentration of leaching agent is <4%, viscosity of leaching agent is <1.5 mPa?s, hydraulic gradient is <0.75, flow rate of leaching agent is <3 mL/min, and the water content of raw ore is >11%, the mobility of fine particles in ore is low and the permeability of ore body is good. This is conducive to the seepage of leaching solution and leaching of rare earth ion. |
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