7TH EUROPEAN COKE AND IRONMAKING CONGRESS - ECIC 2016

Understanding the characteristics of iron ore is paramount for predicting the performance of downstream processes. Whilst chemical assay and mineralogical assessments are routinely undertaken, the effects of textural information are often overlooked. For an industry striving to optimise productivity, an understanding of the impact of the textural characteristics of feed materials on process...

It is of significant importance to utilize the in-plant iron-bearing dust and mud of steel mills which are characterized by high iron and carbon content, and some toxic metals such as lead and zinc etc. In this paper the conditions of new process of metallizing sintering of pellets were optimized to manufacture pre-reduced sinter. Under the conditions of C/Fe ratio of 0.5 (50% coal blended in...

The cycle and enrichment of potassium (K) exist in the blast furnace. Under laboratory conditions, a kind of vapor adsorption test between the K and sinter was design to research the adsorption character of sinter ore on K vapor, and adsorption mechanism was analyzed by some microscopic observation. Elemental K and K2CO3was chosen aspotassium source to provide K vapor. Sinter ore had the...

Depletion of high-quality hematite ore stimulates an increase in the utilization of magnetite ore in ironmaking. Reduction of magnetite ore pellets was studied in a fixed-bed reactor at different temperatures and gas compositions. The effect of temperature on the magnetite ore reduction was studied at 700 – 900 °C by CO/CO2 gas mixture with 80 vol pct CO. The effect of gas composition was...

Coke is the only raw material which remains solid even at the lowest zone of blast furnace. The bed-permeability in the bosh zone of the blast furnace is maintained by the solid coke structure. The wetting behaviour of slags in the coke bed of the bosh region in a blast furnace plays a very important role on the process efficiency by directly influencing the free movement of the burden and...

The micro-image processing software package VisuMet identifies the main mineral phases in sinter. Magnetite, hematite, calcium ferrite, siliceous glass as well as pores will be distinguished by their different grey levels. VisuMet calculates the area in pixel of the phases and the pores. Each phase is available as a binary image for further analysis.

Due to their physical and thermochemical properties, alkali metals as potassium and sodium show a specific behavior in ironmaking processes. The reduction and oxidation of alkali compounds as well as their evaporation and condensing behavior lead to the formation of an alkali cycle. Furthermore, an enrichment of harmful K- and Na-compositions takes place. This affects refractory material, fuel...

In the ironmaking processes via the carbothermic reduction with the tall-bed reactor, the composite pellets can be rapidly reduced to highly metallized direct reduced iron (DRI) with high productivity under high temperature. However, the volume change of the pellets during the reduction will affect the efficiency of heat transfer from the freeboard to the tall-bed pellets inside the reactor....

We performed micro-CT imaging and analysis on coke CSR lumps, before, during and after reaction under conditions aimed at replicating the standard CSR test. The aim is to develop a stronger mechanistic understanding of the reactivity of cokes made from different coals, by examining the change in coke microstructure as the high-temperature reaction with CO2 progresses. Individual coke lumps...

Pulverised coal injection (PCI) has been commonly established into the blast furnace (BF) operation practice. However due to volatile coal market, blast furnace operators are often forced to change coals used for injection. Handling new coals presents a great challenge. An estimation of their compatibility in the blast furnace process based on chemical analysis alone is often not...

The CaO-Fe2O3 (CF) system is the most significant binding phase for fluxed sinter, of which the reducibility becomes a vital index having great importance on the evaluation of sinter qualities. SiO2 is the necessary composition of SFC (SiO2-Fe2O3-CaO) generated from CF. Investigation on the isothermal reduction of CaO·Fe2O3 with addition of 2, 4, 8%(mass percent) SiO2 in a continuous stream of...