In the present study, the use of horse residue as an alternative reducing agent in the roasting of a low-grade goethite ore containing 17.60% Fe was investigated. Additional roasting experiments were carried out with corn starch and without reducing agent for comparison. Each roasted product was characterized using X-ray diffraction (XRD) and magnetic hysteresis (MH) loops analyses. The optimum roasting conditions (roasting temperature [400, 500, and 600 °C], reducing agent/ore ratio [0.04, 0.08, and 0.12], and roasting time [10, 20, and 30 min]) were investigated based on the Taguchi approach. The magnetic susceptibilities of the roasted sample with the addition of reducing agents were higher compared to that of the roasted sample in the absence of reducing agent. Experimental findings indicate that the horse residue can be used as the reducing agent. Finally, an iron ore concentrate assaying a Fe grade of 62.12% with a recovery of 56.93% was prepared using wet magnetic separation at a magnetic intensity of 0.5 T from the ore roasted under the following roasting conditions: roasting temperature of 500 °C, reducing agent/sample ratio of 0.08, and roasting time of 30 min.

中文翻译：

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马渣焙烧低品位针铁矿及其磁选选矿

在本研究中，研究了在焙烧含 17.60% Fe 的低品位针铁矿中使用马渣作为替代还原剂。使用玉米淀粉和没有还原剂进行额外的烘焙实验以进行比较。使用 X 射线衍射 (XRD) 和磁滞 (MH) 回线分析对每种焙烧产品进行表征。研究了最佳焙烧条件（焙烧温度 [400、500 和 600 °C]、还原剂/矿石比 [0.04、0.08 和 0.12] 和焙烧时间 [10、20 和 30 分钟]）。田口方法。与不添加还原剂的焙烧样品相比，添加还原剂的焙烧样品的磁化率更高。实验结果表明，马渣可用作还原剂。最后，采用磁强度为 0.5 T 的湿式磁选从以下焙烧条件下焙烧的矿石中制备了分析为 62.12%、回收率为 56.93% 的铁精矿：焙烧温度为 500 °C，还原试剂/样品比为 0.08，焙烧时间为 30 分钟。