Promoting the Utilization of High-Alumina Iron Ores During Sintering by Pre-preparing a Low-Melting-Point Flux

IF 2.5 3区材料科学 Q3 GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY

Journal of Sustainable Metallurgy Pub Date : 2024-09-09 DOI:10.1007/s40831-024-00923-1

Junjie Zeng, Jin Wang, Rui Wang, Ningyu Zhang, Yongda Li, Yuxiao Xue, Xuewei Lv

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Abstract

High-alumina iron ore sintering is characterized by poor sinter indices and high carbon emission due to the limited formation amount of liquid phase. In this study, the conventional Ca-bearing flux (i.e., burnt lime) was substituted by a new Ca-bearing flux with low melting point (i.e., prefabricated calcium ferrite) for the improvement of the formation ability of liquid phase during sintering. The substitution of prefabricated calcium ferrite for burnt lime contributed to the reduction of the formation temperature of liquid phase and the improvement of liquid-phase fluidity. At the optimum substitution ratio of 20%, the strength of sinter compacts was improved by 38.38% in the mini-sintering tests due to the more formation of liquid phase, especially SFCA (i.e., Silico-ferrite of calcium and alumina). In addition, the proportion of high-alumina iron ore can be appropriately increased from 10.20% to 25.20% at the substitution ratio of 20% under the premise of the similar strength of sinter compacts. High-alumina iron ore can be effectively utilized during sintering by pre-preparing the low melting-point flux, which will be further proved by the relevant sinter pot tests in our follow-up study.

Graphical Abstract

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通过预先制备低熔点助熔剂促进烧结过程中对高铝铁矿石的利用

由于液相形成量有限，高铝铁矿石烧结的特点是烧结指数差和碳排放量高。本研究用低熔点的新型含钙助熔剂（即预制铁酸钙）替代传统的含钙助熔剂（即烧石灰），以提高烧结过程中液相的形成能力。用预制铁酸钙替代烧石灰有助于降低液相的形成温度和改善液相流动性。在 20% 的最佳替代率下，由于液相，尤其是 SFCA（即钙铝硅酸盐）的形成增多，烧结密实度在小型烧结试验中提高了 38.38%。此外，在烧结密实度相近的前提下，高铝铁矿石的比例可适当增加，在替代率为 20% 时，可从 10.20% 增加到 25.20%。通过预先制备低熔点助熔剂，可在烧结过程中有效利用高铝铁矿石，这将在后续研究中通过相关的烧结锅试验得到进一步证实。图文摘要

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来源期刊

Journal of Sustainable Metallurgy Materials Science-Metals and Alloys

CiteScore

4.00

自引率

12.50%

发文量

151

期刊介绍： Journal of Sustainable Metallurgy is dedicated to presenting metallurgical processes and related research aimed at improving the sustainability of metal-producing industries, with a particular emphasis on materials recovery, reuse, and recycling. Its editorial scope encompasses new techniques, as well as optimization of existing processes, including utilization, treatment, and management of metallurgically generated residues. Articles on non-technical barriers and drivers that can affect sustainability will also be considered.