Smelting fine ore into a block with the lower phosphorus content before entering the furnace can achieve cleaner production and value-added efficiency for ferromanganese alloy enterprises, and microwave sintering technology shows bright application prospects in the secondary utilization of waste materials and environmental-friendly preparation of high-performance alloy materials. In this work, FeMn78C8.0 grade bulk alloy with enhanced volume density properties was efficiently prepared via an environmental-friendly microwave sintering approach, using high-carbon ferromanganese powder with low processing efficiency in factories as the raw material. Results indicate that adding certain carbon can prevent the oxidation behavior of Mn and Fe elements during the sintering process, and the qualified FeMn78C8.0 alloy can be obtained by controlling sintering temperature and duration time, with the optimum sintering conditions determined at 1168 °C for 11 min and with the alloy powder of <75 μm accounting for 63%. Meanwhile, some fine pores and cracks on the surface of FeMn78C8.0 alloy are conducive to the densification of the alloy sample and the internal alloying process of the carcass, further to enhance the volume density properties; and influence of the powder of <75 μm on the volume density properties is more profound than that by the powder of 75 μm–150 μm. Additionally, a higher value of volume density of 5.86 g cm⁻³ is obtained at 1200 °C holding for 10 min, far beyond the traditionally produced alloy by electric furnace with an average value of 5.56 g cm⁻³. The work highlights the efficient application of microwave sintering to the secondary utilization of ferromanganese powder and the environmental-friendly preparation of alloy materials.

细铁矿石在进入熔炉前先将其冶炼成磷含量较低的块，可以为铁锰合金企业实现更清洁的生产和增值效率，而微波烧结技术在废料的二次利用和环保制备中具有广阔的应用前景。高性能合金材料。在这项工作中，采用环保的微波烧结方法，以工厂中加工效率低的高碳锰铁粉为原料，通过环保的微波烧结方法有效地制备了具有增强的体积密度特性的FeMn78C8.0级整体合金。结果表明，添加一定量的碳可以防止Mn和Fe元素在烧结过程中的氧化行为，而合格的FeMn78C8则可以防止氧化。通过控制烧结温度和持续时间可以得到0种合金，在1168°C下确定11分钟的最佳烧结条件，<75μm的合金粉末占63％。同时，FeMn78C8.0合金表面存在一些细小的孔和裂纹，有利于合金样品的致密化和and体的内部合金化，进一步提高了体积密度性能。<75μm的粉末对体积密度特性的影响比75 μm–150μm的粉末更为深刻。此外，更高的体积密度值为5.86 g cm 0合金有利于合金样品的致密化和and体的内部合金化过程，进一步提高了体积密度性能；<75μm的粉末对体积密度特性的影响比75 μm–150μm的粉末更深。此外，更高的体积密度值为5.86 g cm 0合金有利于合金样品的致密化和and体的内部合金化过程，进一步提高了体积密度性能；<75μm的粉末对体积密度特性的影响比75 μm–150μm的粉末更深。此外，更高的体积密度值为5.86 g cm在1200°C下保持10分钟^可得到-3，远远超过了传统的电炉合金的平均5.56 g cm ^-3。这项工作强调了微波烧结在锰铁粉二次利用中的有效应用以及合金材料的环保制备。