北京建筑大学学报

以四川攀枝花地区的钒钛尾矿和提钛渣为主要原材料，开发了一种基于工业固废协同的尾矿基胶凝材料及充填材料，并系统探究了其制备工艺、工作性能、力学性能及耐久性能，对其作为充填材料的可行性进行了评价。尾矿(比表面积720 m²/kg)45%，提钛渣(比表面积550 m²/kg)25%，石膏(比表面积450 m²/kg)15%，基准水泥15%条件下胶凝材料的28 d抗压强度可达33.1 MPa，抗折强度可达8.3 MPa，达到了P. S. A32.5水泥要求。以此制备充填材料，浓度76%～78%，灰砂比1∶6～1∶10，充填材料的剪切应力为85.7～112 Pa，黏度为1.03～2.23 Pa·s，表现出较好的流变学特性；浓度78%，灰砂比为1∶6,Ca(OH)₂掺量为6%的条件下，充填材料的沉降率为1.3%,180 d的抗压强度可达6.37 MPa。耐久性试验表明，76%浓度，Ca(OH)₂掺量为6%，灰砂比为1∶5的充填材料在10%浓度Na_2SO₄溶液浸泡90 d后，强度损失率为53.13%，质量损失率为0.77%；在10%浓度NaCl溶液浸泡90 d后，充填材料强度损失率为11.46%，质量损失率为2.4%；在pH=3的HCl溶液浸泡90 d后强度损失率为37.5%，质量损失率为2.74%。充填材料表现出了较好的耐侵蚀性能。

Using vanadium-titanium tailings and titanium-extracted slag from the Panzhihua region of Sichuan, China, as the main raw materials, a tailings-based cementitious material and backfill material based on the synergistic utilization of industrial solid waste has been developed. The preparation process, workability, mechanical properties, and durability of the material were systematically investigated, and its feasibility as a backfill material was evaluated. The study shows that under the conditions of 45% tailings(specific surface area 720 m²/kg), 25% titanium-extracted slag(specific surface area 550 m²/kg), 15% gypsum(specific surface area 450 m²/kg), and 15% reference cement, the 28-day compressive strength of the cementitious material can reach 33. 1 MPa, with a flexural strength of 8. 3 MPa, meeting the requirements of P. S. A32. 5 cement. Using this material to prepare backfill at a concentration of 76%～78% and a binder-to-sand ratio of 1∶6～1∶10, the shear stress ranges from 85. 7 Pa to 112 Pa, and the viscosity ranges from 1. 03 Pa·s to 2. 23 Pa·s, demonstrating favorable rheological properties. Under the conditions of 78% concentration, a binder-to-sand ratio of 1∶6, and 6% Ca(OH)₂ addition, the sedimentation rate of the backfill material is 1. 3%, and the 180-day compressive strength reaches 6. 37 MPa. Durability tests indicate that for a backfill material with 76% concentration, 6% Ca(OH)₂ addition, and a binder-to-sand ratio of 1∶5, after 90 days of immersion in a 10% Na₂ SO₄ solution, the strength loss rate is 53. 13% and the mass loss rate is 0. 77%; after immersion in a 10% NaCl solution for 90 days, the strength loss rate is 11. 46% and the mass loss rate is 2. 4%; and after immersion in an HCl solution with pH=3 for 90 days, the strength loss rate is 37. 5% and the mass loss rate is 2. 74%. The backfill material exhibits good resistance to erosion.