A specific mortar material (abbreviated as RFT) was designed from industrial solid wastes, such as red mud, fly ash, and iron tailings. It was mainly developed for 3D printing in this work. Mechanical properties, microstructure and heavy metal leaching properties were discussed. The RFT composed of 15% red mud, 45% iron tailings, 9% fly ash, 30% cement, and 1% FDN water reducing agent attained good mechanical properties. Hydration products including Ca(OH)₂, ettringite and C-S-H gel were found in RFT through SEM observation. Iron tailings mainly acted as fine aggregates in RFT, and they were wrapped by the C-S-H gels, producing a strong bonding effect between aggregates and cementitious matrix. The leaching toxicity test results proved that the developed RFT mortar materials were environmentally acceptable. Finally, RFT was subjected to a 3D printing test to verify its feasibility as 3D printable construction material.

一种特定的砂浆材料（简称 RFT）是从工业固体废物中设计的，例如赤泥、粉煤灰和铁尾矿。在这项工作中，它主要是为 3D 打印而开发的。讨论了机械性能、微观结构和重金属浸出性能。由15%赤泥、45%铁尾矿、9%粉煤灰、30%水泥和1% FDN减水剂组成的RFT具有良好的力学性能。水合产物包括 Ca(OH) ₂，通过SEM观察在RFT中发现钙矾石和CSH凝胶。铁尾矿在 RFT 中主要作为细骨料，被 CSH 凝胶包裹，在骨料和胶凝基体之间产生强烈的粘结作用。浸出毒性试验结果证明，所研制的RFT砂浆材料是环境可接受的。最后，RFT 进行了 3D 打印测试，以验证其作为 3D 可打印建筑材料的可行性。