Already in the middle of the last century the submerged arc furnace was used to reduce iron ore and thus for the production of pig iron. The procedure is similar to the process techniques still used today for the production of ferroalloys. Early on, there were efforts to reduce the high energy demand for pig iron production in the SAF by means of upstream installed, gas-powered pre-reduction processes and at the same time to be able to use lower-quality applications due to the pretreatment. This is how the Krupp racing process and similar processes with a rotary tube were developed and later, especially at the end of the last century, processes with large rotary hearth furnaces. Examples are the technologies known as “Inmetco” and “Redsmelt” process.
Prereduction and SAF
Recently, another combination has gained more interest: the combination of shaft furnace, electrical reduction furnace and converter. This process line combines the very effective, modern pre-reduction systems (as e.g. from the company Midrex) with tailor-made electric furnaces for residual reduction and slag metallurgy and enables the converter to adjust the desired pig iron quality.
Bluemetals offers the complete conceptual engineering for this line, to create an optimal SAF, which integrates itself perfectly and economically into the overall process line. Bluemetals also mediates the necessary core components for furnaces. Alternatively, Bluemetals also offers the evaluation of planned or existing concepts.