This study mainly focused on an orthogonal optimization design of low-density and high-strength ceramic proppants prepared by low-grade bauxite and feldspar that met the standard requirements. The orthogonal experimental design of L₂₅ (5³) was employed to study the significance sequence of three factors, including milling time of bauxite, milling time of feldspar, and sintering temperature. The results show that the particle size of feldspar is the most important factor for the performance of the proppants. The longer the milling time of feldspar is, the finer the particle size of feldspar is, and the easier it is to form liquid phase at a lower temperature. For the breakage ratio, the optimal experimental combination is bauxite milled for 4 h, feldspar milled for 8 h, and sintering temperature of 1280°C. The proppants prepared by the optimal combination have bulk density of 1.48 g cm⁻³, apparent density of 2.7 g cm⁻³, breakage ratio of 4.07% under 52 MPa closed pressure, and acid solubility of 2.15%.

本研究主要集中在满足标准要求的低品位铝土矿和长石制备的低密度高强度陶瓷支撑剂的正交优化设计中。L ₂₅（5 ³）被用来研究三个因素的显着性顺序，包括铝土矿的研磨时间，长石的研磨时间和烧结温度。结果表明，长石的粒径是影响支撑剂性能的最重要因素。长石的研磨时间越长，长石的粒度越细，并且越容易在较低的温度下形成液相。对于破损率，最佳实验组合是铝土矿研磨4小时，长石研磨8小时，烧结温度1280°C。通过最佳组合制备的支撑剂的堆积密度为1.48g cm ^-3，表观密度为2.7g cm ^-3，在52MPa的封闭压力下的破损率为4.07％，酸溶解度为2.15％。