ABSTRACT

The use of iron ore concentrate and micropellets as sinter feed was evaluated. Five mixtures containing different proportions of concentrate and micropellets, together with iron ore fines, were granulated and sintered in a pilot scale sinter plant. It was found that the addition of iron ore concentrate and/or micropellets to the sinter feed resulted in a significant increase in permeability of the granulated bed, but a large drop in sinter production rates. Although the introduction of iron ore concentrate and/or micropellets to the sinter mixture did not significantly impact sinter strength or reducibility (as measured through tumble – (TI) and reducibility indices (RI)), it severely impacted on their strengths during reduction (as measured through RDI_{−3.5 mm} and RDI_{−0.5 mm}). The introduction of iron ore concentrate and micropellets resulted in a general increase in the amount of fines that form during reduction, exceeding the maximum acceptable levels (RDI_−0.5mm maximum 5%) set by industry. Sinters containing high amounts of micropellets experienced a more severe degradation than the concentrate-rich sinters. It is therefore more viable to use iron ore concentrate in the sinter feed as higher production costs are associated with the production of micropellets. Sinters produced through concentrate addition also generate less fines on reduction.

摘要

评估了铁精矿和微球团作为烧结矿进料的用途。五种含有不同比例的精矿和微球团的混合物以及铁矿粉，在中试规模的烧结厂中进行造粒和烧结。发现在烧结矿进料中添加铁精矿和/或微粒会显着提高粒化床的渗透性，但会大大降低烧结矿的生产率。尽管在烧结混合物中加入铁精矿和/或微球团并没有显着影响烧结矿的强度或可还原性（通过滚动 - (TI) 和可还原性指数 (RI) 测量），但它严重影响了它们在还原过程中的强度（如通过 RDI _{-3.5 mm}和 RDI _{-0.5 mm测量}）。铁精矿和微球团的引入导致还原过程中形成的细粉量普遍增加，超过了行业设定的最大可接受水平（RDI _-0.5mm，最大 5%）。与富含精矿的烧结矿相比，含有大量微球团的烧结矿经历了更严重的降解。因此，在烧结进料中使用铁精矿更为可行，因为更高的生产成本与微球团的生产相关。通过添加精矿生产的烧结矿在还原时也产生较少的细粉。