Orthogonal test of compound soil curing agents in ionic rare-earth heap leaching sites

To solve the problem of slope soil stability at ion-type rare earth heap leaching sites, the research and development of a new environmentally friendly soil curing agent is of great significance to reduce soil erosion in ion-type rare earth heap leaching sites and stabilize the mine slope. With the orthogonal test method of three factors and three levels, nine groups of composite soil solidifier test schemes with different mass proportions were designed, and the indoor direct shear test was carried out to test the shear strength of the consolidated soil. The range analysis and variance analysis were carried out on such test results. The final results showed that among the composite soil curing agents, Portland cement could best improve the cohesion of solidified soil, compared with waterborne polyurethane and bentonite; bentonite could be superior to Portland cement and waterborne polyurethane in improving internal friction angle of solidified soil. Comprehensive analysis of the results indicates that when the mass ratio of bentonite∶sodium bicarbonate∶ aqueous polyurethane∶ Portland cement∶ water is 10∶ 1∶10∶20∶100, the composite soil curing agent has a good curing effect and economic benefits for the ion-type rare earth heap leaching sites.