原地浸出工艺优化了离子型稀土矿开采方式，但无组织泄露可能会造成资源的流失和生态环境的影响，因此开采过程中防渗工作尤为重要。以水泥复合材料（C-CM）、液态硅基复合材料（Si-CM）、丙烯酸盐复合材料（A-CM）3种灌浆防渗材料为基础，并复配高岭土尾矿，通过帷幕灌浆材料的pH、密度、黏度、凝结时间、固砂体强度测试、浆液扩散模拟、渗透性和耐久性测试，分析对比各帷幕灌浆材料各项指标。结果表明：C-CM的固砂体强度较高，但A-CM和Si-CM的黏度较低，可灌性更强，所形成的固砂体的渗透系数更低，更适合裂隙较小区域防渗。Si-CM在干湿循环和冻融循环中降解较快，且降解产物主要为SiO₂。另外，添加高岭土尾矿可在一定程度上提升防渗材料固砂体的强度和防渗性能，且增加了材料的前期耐久性。

The mining method of ion-type rare earth ores has been optimized by the in-situ leaching process. However, unorganized leakage may cause resource loss and impacts on the ecological environment. Therefore, anti-seepage work during the mining process is of particular importance. Based on three grouting anti-seepage materials, namely cement composite material (C-CM), liquid silicon-based composite material (Si-CM), and acrylate composite material (A-CM), and compounded with kaolin tailings, various indicators of each curtain grouting material were analyzed and compared through tests including the pH, density, viscosity, setting time, solid sand body strength test, slurry diffusion simulation, permeability, and durability test of the curtain grouting materials. The results indicate that the solid sand body of C-CM has relatively high strength, while A-CM and Si-CM have lower viscosity, stronger groutability, and the solid sand bodies formed have lower permeability coefficients, making them more suitable for anti-seepage in areas with smaller fractures. Si-CM degrades relatively quickly in dry-wet cycles and freeze-thaw cycles, and the degradation product is mainly SiO₂. In addition, the strength and anti-seepage performance of the solid sand body of the anti-seepage material can be improved to a certain extent by adding kaolin tailings, and the early durability of the material is also increased.