Utilization of low-grade manganese ore adopting the carbothermic reduction roasting process is a proven method to produce high-grade manganese ore. To minimize industrial waste and protect the environment, gas cleaning plant sludge (GCPS), which is a solid waste from steel industries, was employed as a reductant to perform the reduction roasting process. The optimum conditions to carry out reduction roasting of the low-grade manganese ore were found to be: a roasting temperature of 950 °C, a residence time of 2 h, 40% GCPS as reductant, and magnetic separation at 5000 G for a manganese ore size of –10 mm. A low-grade manganese ore comprising Mn grade 31.27% and Fe grade 19.78% having a Mn/Fe ratio of 1.58 containing a high silica content of 26.48% was used for the carbothermic reduction roasting having mineral phases of pyrolusite (MnO₂) and hematite (Fe₂O₃) as found from XRD. The gangue minerals were separated during the magnetic separation, and the upgraded product was obtained, which reached a maximum value of TMn 49.5% with RMn 76.55% and TFe 62.19% with RFe 42.51%. In the study, activated charcoal (AC) was also taken as a reductant for comparative analysis; the experimental results revealed that GPCS performed better than that of the AC, showing potential to be used as a reductant in metallurgical industries. However, the resulted Mn/Fe ratio was very low for the reduced sample; therefore, it can be used for smelting along with high-grade manganese ores as a feed.

采用碳热还原焙烧工艺利用低品位锰矿是生产高品位锰矿的一种行之有效的方法。为了最大程度地减少工业废物并保护环境，采用了钢铁行业的固体废物即气体净化厂污泥（GCPS）作为还原剂，以进行还原焙烧过程。发现进行低品位锰矿石还原焙烧的最佳条件是：焙烧温度为950°C，停留时间为2 h，GCPS为还原剂40％，锰的磁选为5000 G矿石大小为–10毫米。锰含量为26.48％的Mn / Fe比为1.58且锰/铁比为1.58的低品位锰矿被用于碳热还原焙烧，该焙烧具有软锰矿的矿物相（MnO₂）和从XRD中发现的赤铁矿（Fe ₂ O ₃）。在磁选过程中分离出脉石矿物，并获得了提质产品，其最高值为TMn 49.5％（RMn为76.55％）和TFe 62.19％（RFe为42.51％）。在研究中，活性炭（AC）也被用作还原剂进行比较分析。实验结果表明，GPCS的性能优于AC，表现出了在冶金工业中用作还原剂的潜力。但是，对于还原后的样品，所得的Mn / Fe比非常低。因此，它可以与高档锰矿一起用作原料冶炼。