ABSTRACT Effect of nut coke addition with ferrous burden (pellet and sinter mixture) is experimentally investigated under simulated blast furnace conditions. Nut coke mixing degree was varied (0, 20 and 40 wt-%) as a replacement of the regular coke. During smelting, the ferrous bed evolves through three distinct stages of shrinkage due to indirect reduction, softening and melting, respectively. Nut coke increases the reduction kinetics, limits softening and enhances iron carburization in the ferrous bed to affect all three stages. Additionally, nut coke physically hinders the sintering among the ferrous burden to keep the interstitial voids open, which exponentially increases the gas permeability. A significant impact of nut coke mixing occurs in the cohesive zone temperature range, which is decreased by 77°C upon addition of 40 wt-% nut coke. Various experimental results give supports for the extensive utilization of nut coke as a replacement of regular coke in the blast furnace.

中文翻译：

---

坚果焦混合装料条件下的铁料行为

摘要 在模拟高炉条件下，通过实验研究了坚果焦与铁料（球团和烧结混合物）的添加效果。果仁焦混合度变化（0、20 和 40 重量%）以替代普通焦炭。在冶炼过程中，由于间接还原、软化和熔化，铁床分别经历了三个不同的收缩阶段。果仁焦增加了还原动力学，限制了软化并增强了铁床中的铁渗碳，从而影响了所有三个阶段。此外，坚果焦在物理上阻碍了铁料之间的烧结，以保持间隙空隙打开，从而以指数方式增加气体渗透性。坚果焦混合的显着影响发生在内聚区温度范围内，在添加 40 wt-% 坚果焦后，该温度范围降低了 77°C。