International Process Metallurgy Symposium in Honour of Professor Pekka Taskinen - Metallurgy as a tool for challenges in circular economy

This International Process Metallurgy Symposium in Honour of Professor Pekka Taskinen was already the second honorary symposia in Aalto University School of Chemical Engineering, Department of Chemical and Metallurgical Engineering, so it was already a tradition. It truly was International Symposium having presenters from more than ten nationalities. The title of this Symposium includes a sub-title of “Metallurgy as a tool for challenges in circular economy”, which emphasizes the important role metallurgy and metallurgists have in solving the resource deficit in metals and minerals. We have already seen the shift from “traditional” raw material research towards recycled materials and their impact on metallurgical processes. Another emerging or growing trend is the need and request for zero waste processes. All this underlines the importance of fundamental metallurgical research, knowledge and education

Copper matte - slag reaction sequences and separation processes in matte smelting

While particle combustion and chalcopyrite oxidation in suspension smelting is well understood, few studies are available regarding the melt-melt reactions and the separation between copper matte and slag in matte smelting. In the present work, experimental investigations in air and argon atmosphere were conducted using a mixture of synthetic slag and chalcopyrite concentrate. The sequential reaction and separation processes occurring in matte smelting are outlined. Possible limiting factors in the overall process are also proposed. The result of the present work forms an important foundation for future work in the kinetic rate formulation of molten phase reactions between copper matte and slag in matte smelting

Copper matte - slag reaction sequences and separation processes in matte smelting

Dok su reakcije sagorevanje čestica i oksidacija halkopirita prilikom topljenja suspenzija dobro proučeni, postoji jako mali broj studija koje se ticu reakcija izmedu tečnih faza i raslojavanja bakrenca i šljake prilikom topljenja bakrenca. U ovom radu izvršena su eksperimentalna istraživanja u vazdušnoj i argonskoj atmosferi korišćenjem mešavine sintetičke šljake i koncentrata halkopirita. Prikazan je redosled reakcija i procesa separacije koji se dešavaju u procesu topljenja. Takode su dati i mogući ograničavajući faktori u celokupnom procesu. Rezultati ovog rada predstavljaju važnu osnovu za buduće radove u oblasti formulacije kinetike reakcija izmedu tečnog bakrenca i šljake u procesu topljenja bakrenca.Peer reviewe

Online modelling of heat transfer, solidification and microstructure in continuous casting of steel

Abstract Advanced numerical simulation models for continuous casting of steel were developed in Finland by Casim Consulting and Aalto University in cooperation with the University of Oulu and the steel industry. The aim was to develop models that are scientifically rigorous, but also computationally fast enough to be used in online applications. The models developed are a transient three-dimensional heat transfer model, CastManager, and a solidification and microstructure model, IDS. The computing time of these models are short, and they are integrated together in one online concept. This concept is installed in the automation systems of four slab casters in Finland. Testing and validation work is in progress. The system simulates the important heat transfer, solidification and microstructural phenomena in continuous casting online. The future aim is that this information will be used for online quality control and for optimizing the process conditions to avoid formation of defects. Many quality indices have already been developed. A steady state version of the CastManager tool has also been developed, called Tempsimu