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Renewable reducing agents for the use in ferroalloy industries

Gerrit Ralf Surup will defend his thesis entitled “Renewable reducing agents for the use in ferroalloy industries” for the PhD-degree Thursday 29 August 2019. (Photo: Private)

The heat treatment to 900 °C reduced mainly the volatile matter of the charcoal, whereas the biooil conditioning increased the charcoal yield by about 20 %.
In addition, supercritical CO2 extraction enables the extraction of more than half of the value-added compounds without any significant influence on the charcoal yields.

Gerrit Ralf Surup

PhD Candidate

Gerrit Ralf Surup at the Faculty of Engineering and Science has submitted his thesis entitled “Renewable reducing agents for the use in ferroalloy industries”, and will defend the thesis for the PhD-degree Thursday 29 August 2019.

Summary of the thesis by Gerrit Ralf Surup:

Renewable reducing agents for the use in ferroalloy industries

Biocarbon or charcoal as a renewable reducing agent has attracted a large interest in the metallurgical industry as a way to reduce the anthropogenic (“man-made”) greenhouse gas emissions in the upcoming decades.

Relies on fossil based reducing agents

To retain the high throughput and high quality of metallurgical products, specific properties are demanded for the reducing agents.

Although charcoal is produced within different processes in for example Brazil, Nigeria or Ethiopia, none of these products provide completely the required properties or is produced sustainable.

In addition, most companies continue to rely on fossil based reducing agents due to the limited knowledge of biocarbon properties and the knowledge gaps in required process conditions to produce charcoal with acceptable properties at low costs.

Biooil increases the charcoal yield

In this dissertation, different process routes of two wood species were investigated to produce tailor-made charcoal.

The research comprised of operating parameters such as a primary heat treatment (500 to 1300 °C), secondary heat treatment (700 to 2800 °C) and biooil conditioning.

The heat treatment to 900 °C reduced mainly the volatile matter of the charcoal, whereas the biooil conditioning increased the charcoal yield by about 20 %.

In addition, supercritical CO2 extraction enables the extraction of more than half of the value-added compounds without any significant influence on the charcoal yields.

Proposes process route

The volatile matter content of charcoal at heat treatment temperature of 1600 °C is like that of metallurgical coke. https://en.wikipedia.org/wiki/Metallurgical_coal

The reactivity of charcoal heat treated at 2400 °C is similar to those of metallurgical coke, emphasizing the importance of high heat treatment temperatures on the charcoal structure.

It was shown that high heat treatment temperatures resulted in the ordering of the charcoal carbonaceous matrix.

The pelleting of charcoal with biooil as binder showed that biooil can be used as a binding agent to produce thermally stable charcoal-based pellets. We propose a process route to produce charcoal pellets with improved properties.

 

Disputasfakta:

Kandidaten: Gerrit Ralf Surup (Kassel, Germany 1981), received his Diploma (comparable to M.Sc.) from the Department of Mechanical Engineering at the University of Kassel, Germany (2009) and finished a second M.Sc. degree in Renewable Energy and Energy Efficiency at same University in 2012. After he completed his study, he worked for 4 years as a research engineer at Air Liquide Research and Development. He started his Ph.D. study in October 2015 and submitted his thesis in March 2019. Parallel to his Ph.D. study he taught a master course in bioenergy in 2017 and 2018. His research interests comprise thermo-chemical processes, the application of pyrolysis products and the improvement of current technologies in that area.

The trial lecture and the public defence will take place at Auditorium C2 040 Thursday 29 August 2019.

Head of the Department of Engineering Sciences, Professor Geir Grasmo, will chair the disputation.

Trial lecture at 10:15 a.m.

Public defense at 12:15 p.m.

Given topic for trial lecture“What is the future of a cleaner ferroalloy industry”

Thesis Title: “Renewable reducing agents for the use in ferroalloy industries”

Search for the thesis in AURA - Agder University Research Archive, a digital archive of scientific papers, theses and dissertations from the academic staff and students at the University of Agder. The thesis will also be available at the University Library, and some copies will also be available for loan at the auditorium where the disputation takes place.

Opponents:

First opponent: Professor Merete Tangstad, Department of Materials Science and Engineering, NTNU (Norway)

Annenopponent: Research Scientist Dr. Anthony Dufour, CNRS, Université de Lorraine (France)

Associate Professor Dmitry Vysochinskiy, UiA, is appointed as the administrator for the assessment commitee.

 

Supervisors were Professor Henrik Kofoed Nielsen, (main supervisor), Associate Professor Tore Vehus, UiA and  Senior Researcher Per-Anders Eidem (SINTEF), (co-supervisors)

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