The permeability of the sinter green beds will remarkably deteriorate when magnetite concentrate powder is introduced into the raw blend. To address this problem, a technique of drying after high-moisture granulation is proposed. Using this technique, the permeability can be raised from 40.45 JPU to 46.05 JPU at 7.7 wt% granulation moisture. At the same time, the results show that drying may cause the degradation of granules when the granulation moisture is excessive. Therefore, the final permeability of the stacked bed depends on the combined effect of increasing the bed stiffness and decreasing the average particle size. Fortunately, the addition of hydrated lime (HL) can significantly inhibit granule degradation and improve granulation efficiency, which can further improve the bed permeability to 61.41 JPU with a 2% HL addition level (at 7.7 wt% granulation moisture). Finally, an optimized process is proposed that uses low-grade waste heat during sinter cooling to dry the wet granules. This optimization not only meets the energy needs of drying but also facilitates the grade recovery and cascade utilization of waste heat during the sintering process.

当将磁铁矿精矿粉末引入到原料混合物中时，烧结生坯的渗透性将显着降低。为了解决该问题，提出了高湿造粒后的干燥技术。使用该技术，在造粒水分为7.7 wt％的情况下，渗透率可以从40.45 JPU提高到46.05 JPU。同时，结果表明，当制粒水分过多时，干燥可能导致颗粒降解。因此，堆积床的最终渗透率取决于增加床刚度和减小平均粒径的综合效果。幸运的是，添加熟石灰（HL）可以显着抑制颗粒降解并提高制粒效率，在HL添加量为2％的情况下（在7级时）可以将床渗透率进一步提高至61.41 JPU。7 wt％的颗粒水分）。最后，提出了一种优化的工艺，该工艺在烧结冷却过程中使用低级废热来干燥湿颗粒。这种优化不仅满足了干燥的能源需求，而且还促进了烧结过程中废热的品位回收和级联利用。