In this work, the selective reduction of lateritic nickel ore was carried out using sodium sulfate, sodium carbonate, and sodium chloride as additives. The 5 wt% of anthracite coal, which contains 60.35% of fixed carbon and 1.9% of sulfur, was used as a reductant. All raw materials were mixed homogenously prior to the pelletization process into 10–15 mm of diameter. The reduction process was carried out to 50 g of pellets at 950 °C, 1050 °C, and 1150 °C for 60 min in a muffle furnace at atmospheric pressure. It continued with a wet magnetic separation process to separate ferronickel (concentrates) and impurities (tailings). Iron and nickel grade analysis was performed using XRF, while phase transformation and microstructure were analyzed with XRD and SEM–EDS. The results showed that the sodium sulfate was superior, resulting in the highest nickel grade in concentrate, i.e., 15.06%. The sulfidation mechanism, which could inhibit the metallization of iron, effectively increased the nickel grade in concentrate than decomposition of carbonate and chloridization process. The sulfur content in the reductant also influenced the selective reduction process. It promotes more sulfidation of iron, thus increasing the nickel grade in concentrate.

在这项工作中，使用硫酸钠、碳酸钠和氯化钠作为添加剂对红土镍矿进行了选择性还原。使用 5 wt% 的无烟煤作为还原剂，其中含有 60.35% 的固定碳和 1.9% 的硫。在造粒过程之前，将所有原材料均匀混合成 10-15 毫米的直径。还原过程在马弗炉中在大气压下在 950°C、1050°C 和 1150°C 下对 50 g 球团进行 60 分钟。它继续采用湿式磁选工艺来分离镍铁（精矿）和杂质（尾矿）。使用 XRF 进行铁和镍品位分析，而使用 XRD 和 SEM-EDS 分析相变和微观结构。结果表明，硫酸钠优越，导致精矿中镍品位最高，即 15.06%。硫化机理可以抑制铁的金属化，比碳酸盐分解和氯化过程有效地提高了精矿中镍的品位。还原剂中的硫含量也影响了选择性还原过程。它促进了铁的更多硫化，从而提高了精矿中的镍品位。