| 1. |
- Bi, Yanyan, et al.
(författare)
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Three-dimensional determinations of the non-metallic inclusions in different ferroalloys
- 2014
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Konferensbidrag (refereegranskat)abstract
- Ferroalloys are commonly used in the steel industry to alloy or deoxidize the steel during the secondary steelmaking process before casting. Depending upon the ferroalloy quality, the addition can also lead to a supply of deleterious inclusions to the liquid steel. Thus, the number, morphology, size and composition of inclusions in six different ferroalloys (FeTi, FeNb, FeSi, SiMn LCFeCr and HCFeCr) were investigated. This was done in three dimensions (3D) by using SEM in combination with EDS after electrolytic extraction of the ferroalloy samples. Moreover, statistics of extreme values (SEV) were used to determine the largest size of inclusions.
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| 2. |
- Nordquist, A., et al.
(författare)
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A laboratory study of reactions in the hot spot area and in droplets during top lance blowing
- 2004
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Konferensbidrag (refereegranskat)abstract
- The reactions in the hot spot area and in droplets during top lance blowing in a laboratory induction furnace were investigated. The experiments were performed in alumina crucible, with an inner diameter of 150mm and a height of 300mm. In hot spot sampling, the lance was lowered with a flow of inert gas through it to detect where the hot spot was going to be situated. In metal droplet sampling, the droplets were captured with an alumina cup that had a quartz tube as grip. A difference in size, appearance and shape were noted between droplets from melts with and without silicon addition.
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| 3. |
- Sahajwalla, V., et al.
(författare)
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Structure and alkali content of coke in an experimental blast furnace and their gasification reaction
- 2004
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Ingår i: Iron & Steel Technology Conference proceedings. - Warrendale, Pa : Iron and Steel Society. - 1886362750 ; , s. 491-500
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Konferensbidrag (refereegranskat)abstract
- Coke samples excavated from LKAB's Experimental Blast Furnace (EBF) at MEFOS in Luleå, Sweden were used to observe the influence of in-furnace reactions on the changes in chemical stracture of cokes and their influence on kinetics of CO 2 reactivity. In addition to growth of carbon crystallite of coke, alkali concentration particularly potassium and sodium were found to increase as coke descended towards lower part of the EBF. The increase in carbon structure could be linearly related to measured temperature profiles of EBF. Isothermal and non-isothermal TGA measurements are shown to indicate that CO 2 reactivity of coke becomes progressively faster as it moves towards lower part of blast furnace. The study suggests that alkali enrichment of cokes in an operating blast furnace could have a strong catalytic effect on the CO 2 reactivity. Further research is expected to clarify the mechanisms of influence of coke minerals on reactivity and their implications in a blast furnace.
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