Table of Contents

    • 62

    • Management of DRI Fines to Maximize Iron Yield in the EAF

      Management of direct-reduced iron (DRI) pellet size is critical. The efforts discussed in this paper focus on minimizing generation of subsized pellets and then devising a melting practice that best optimizes recycling of the briquetted DRI fines that remain. An important aspect is the development of a melting practice for recycling the briquetted fines. This entails a pre-melting step, where the briquettes are charged ahead of the DRI feed stage to make use of the hot heel in the furnace.

    • 68

    • Carbon Transfer During Melting of Direct Reduced Iron

      In this study, direct-reduced iron (DRI) pellets with different carbon contents were produced by gaseous reduction and carburizing. The DRI pellets were then injected to a laboratory slag-steel melt. During injection, infrared radiation gas analysis was used to monitor CO content in the offgas. It was found that carbon transfer to the steel melt can be achieved despite the presence of an oxidizing slag, and DRI injection might be an effective approach to reducing the nitrogen content of EAF steel.

    • 80

    • KPIs Behaving Badly – Rethinking the Drive for Optimum Performance in the EAF

      This paper will take a look at the changing dynamics in the marketplace, such as scrap and iron ore pricing, energy costs, energy efficiency, transformer size and active power, labor costs, labor consumption trends per ton, and true value-in-use calculations comparing raw materials. These dynamics will be used to question the status quo and the key performance indicators commonly used in the industry to drive processes, for better or for worse.

    • 88

    • Sustainable EAF Steelmaking Through the Use of Polymer Technology

      A series of plant trials has been completed using polymer composite briquette as charge carbon in place of traditional nut coke in electric arc furnaces. The results have shown benefits in increased carbon recovery efficiency, reduced electrical energy consumption and improved productivity. OneSteel is currently in the process of developing commercial-scale manufacturing capabilities for polymer composite briquette.

    • 98

    • Method for Simultaneous Sampling of Steel at Multiple Depths in the Refining Ladle

      In order to reveal the complex effects of the slag-steel interaction in the ladle metallurgy furnace (LMF), a multi-depth sampling practice at three different depths and five key process stages were developed to create a depiction of the evolution of a heat. The data collected were used to depict a snapshot at each key process stage. The samples were collected and analyzed to determine differences in the ladle at different key process steps, as well as to compare against fundamental accepted knowledge at the LMF.