离子型稀土矿二维多孔注液溶液渗流及稀土离子迁移规律研究

Study on percolation of two-dimensional porous injection solution and migration law of rare earth ions in ion-type rare earth ore

掌握离子型稀土矿原地浸矿溶液流动及稀土离子迁移规律是保证资源高效回收的关键。传统柱浸试验无法观察到多孔注液过程中溶液流动扩散及稀土离子迁移规律,基于此,设计了二维箱型浸矿模型,以质量分数2%的MgSO_(4)溶液为浸矿剂,开展多孔注液浸矿试验,结果表明:不同区域的浸出液体积、稀土离子浸出质量以及浸出速度不同,溶液入渗方式由自由入渗转为交汇入渗;注液孔正下方区域浸出液体积最大,交汇区次之,边界区最小;注液孔正下方区域稀土离子浸出几乎无拖尾现象,浸出速度最快,交汇区域次之,边界区域最慢;通过分析矿体各区域平均浸出稀土离子质量发现,稀土离子存在随溶液从注液中心向两侧迁移的行为,孔间交汇区浸出稀土离子质量最大,矿体边界区域次之,注液孔正下方区域浸出稀土离子质量最小。研究成果可为原地浸出注液方式优化提供参考。

The key to ensure efficient resource recovery is to master the flow of in-situ leaching solution and migration law of rare earth ions in ion-type rare earth ore.Traditional column leaching test could not observe the flow diffusion of solution and law migration of rare earth ion during porous injection process.Based on this,two-dimensional box leaching model was designed to carry out porous injection leaching test with MgSO_(4)solution of 2%mass fraction as leaching agent.The results showed that the volume of leach liquid,the quality of leach rare earth ion and the rate of leach were different in different regions,and the solution infiltration mode changes from free infiltration to intersection infiltration.The area directly below the injection hole has the largest volume of leached liquid,followed by the intersection area and the boundary area.The leaching rate of rare earth ions in the area directly below the injection hole was the highest,followed by the intersection area and the lowest in the boundary area.By analyzing the average leached rare earth ion mass in each area of the ore body,it was found that rare earth ion mass migrates from the injection center to both sides with the solution.The leached rare earth ion mass was the largest in the intersection area of the hole,followed by the boundary area of the ore body,and the leached rare earth ion mass was the least in the area directly below the injection hole.The research results can provide reference for the optimization of in-situ leaching injection method.