The project was completed and put into operation in 2022. It adopts phosphorus tailings backfill comprehensive utilization technology for design, employing an economically feasible, low-cost, safe, and environmentally friendly full-tailings backfill process for treating goaf and ecological restoration. The phosphorus tailings are processed to meet Class I solid waste discharge standards. The process is simple, feasible, and extremely low-cost. The treated tailings that meet Class I solid waste discharge standards can be stacked anywhere without the need for impermeable membranes, enabling ecological restoration of open-pit mining pits, effectively reducing tailings storage costs, and saving maintenance expenses for tailings ponds.