Argon oxygen decarburization

Argonoxygen decarburization (AOD) is a process primarily used in stainless steel making and other high grade alloys with oxidizable elements such as chromium and aluminium.

After initial melting the metal is then transferred to an AOD vessel where it will be subjected to three steps of refining; decarburization, reduction, and desulfurization.

The AOD process has a significant place in the history of steelmaking, introducing a transformative method for refining stainless steel and shaping the industry's landscape.

The process was initially introduced by American chemical companies who aimed to refine stainless steel more efficiently and economically.

It offers steelmakers greater flexibility in raw material selection, enabling the use of cost-effective inputs and ensuring accurate and consistent results.The process has also contributed to increased production capacity with relatively small capital investments compared to conventional electric furnace methods.

AOD slag has shown promising potential for usage as a carbon-capture construction material due to its high capacity for CO2 and its low cost.

During carbonation, g-C2S (di-calcium silicate) in the slag reacts with CO2 to produce compounds like calcite and silica gel, resulting in increased compressive strength and improved durability of cementitious materials.

The incorporation of AOD slag as a replacement material in ordinary Portland cement (OPC) during carbonation curing has been studied, demonstrating positive effects on strength and reduced porosity.

These findings suggest that proper selection of modifiers can enhance the performance of stainless steel slag in cementitious applications.

Optimal carbonation ratios have been identified to minimize chromium leaching risks during carbonation-related production activities.