احیای گندله‌های کوره‌ی بلند اولیوینی

Mineral Reactions and Slag Formation During Reduction

of Olivine Blast Furnace Pellets

واکنش‌های کانی‌ها و تشکیل سرباره در طی احیای گندله‌های کوره‌ی بلند اولیوینی

ABSTRACT

The present work focuses on mineral reactions and slag formation of LKAB olivine iron ore pellets (MPBO) subjected to reducing conditions in the LKAB experimental blast furnace (EBF). The emphasis is on olivine reactions with surrounding iron oxides. Many factors influence the olivine behaviour. The study was performed by use of micro methods; optical microscopy, micro probe analysis, micro Raman and Mössbuer spectroscopy and thremodynamic modeling. During manufacturing, in oxidising atmosphere at high temperature (1350°C), olivine alterations occur through slag formation and rim reactions with iron oxides and other additives. To be able to describe olivine behaviour in the rather complex blast furnace reduction process one has to consider factors such as reactions kinetics, reduction degree of iron oxides, vertical and horizontal position in the furnace and reactions with alkali. Samples were collected from the EBF both from in shaft probing during operation and from excavation following quenching of the EBF.

 

بهبود سینترینگ سنگ آهن با الیوین SeqiOlivine improves the sintering of iron ore

SeqiOlivine improves the sintering and

pelletizing performance of iron ore

 الیوین بهبود دهنده عملکرد سینترینگ سنگ آهن 

ABSTRACT

Minelco, the industrial minerals company, started a couple of years back to investigate the possibility of utilizing an olivine-rich dunite rock at Greenland as a source of olivine to different industrial applications. The usage of olivine in industrial applications is predominantly as a slag conditioner and fluxing agent into different metallurgical processes and products, where addition to the blast furnace process, to the sintering of iron ore and iron ore pelletizing are the main areas. In this investigation the usefulness of the olivine mined at Greenland for sinter - and pellet production was studied. The chemical analysis of the olivine from Greenland shows an olivine mineral with high fosterite content. Sintering behaviour and sinter properties shows that the Greenland olivine is a high-rated olivine additive.