Defence of dissertation in the field of energy engineering, process engineering, Arshe Said, M.Sc. (Eng.)

Utilization of industrial solid waste and carbon dioxide in flue gas for the production of valuable minerals.

The public examination of the doctoral dissertation of Arshe Said, M.Sc. (Eng.), will be held on 12 May 2017 at 12.00 at the Aalto University School of Engineering. The title of the dissertation is CO₂ sequestration by steelmaking slags for the production of precipitated calcium carbonate - From laboratory to demonstration stage. The field of the dissertation is energy engineering, process engineering.

From the beginning of the industrial revolution up to today, the so-called one-way or linear production model has dominated the entire manufacturing ecosystem. In this linear model, products are produced from primary raw materials, sold, used, and then discarded as waste. In consequence, this model has led to a domino effect for the entire human ecosystem including its economic, social, and political orientation and the environment. The so-called circular economy is considered to be the alternative to the linear production model.

Industrial solid waste, such as steelmaking slags, is considered to be an attractive raw material for CO₂ sequestration due to its high content of calcium oxide. It has been reported that very large amounts of this material are being dumped into slag disposal areas without being utilized. This dissertation is to illustrate the feasibility of utilizing both steelmaking slags and CO₂ in the flue gas from steelmaking processes as an alternative method for the production of precipitated calcium carbonate (PCC). The feasibility study was originally conducted at laboratory scale with a 0.5 L reactor, after that, we designed and constructed the world’s first pilot plant test facility that converts steel slag and CO₂ into PCC.

Opponents: Professor Timo Hyppänen, Lappeenranta University of Technology, and Dr. Uibu Mai, Tallinn University of Technology

Supervisor: Professor Mika Järvinen, Aalto University School of Engineering, Department of Mechanical Engineering

Electronic dissertation: http://urn.fi/URN:ISBN:978-952-60-7399-6

Doctoral candidate’s contact information:
Arshe Said., Department of Mechanical Engineering
Tel. + 358 50 571 8886, arshe.said@aalto.fi