Australian Professor Gives Howe Lecture on How Heavy Industry Can Help Clean Up the World
05/27/2013 - Today’s steelmakers have a largely untapped opportunity to make a meaningful contribution to solving the world’s growing waste problem while cutting their own production costs, according to Australian innovator, Professor Veena Sahajwalla, from the University of New South Wales.
Today’s steelmakers have a largely untapped opportunity to make a meaningful contribution to solving the world’s growing waste problem while cutting their own production costs, according to Australian innovator, Professor Veena Sahajwalla, from the University of New South Wales.
Delivering the Howe Memorial Lecture at AISTech on 6 May, 2013, Professor Sahajwalla released new research results demonstrating that many problematic waste materials can be cleanly and safely absorbed into steelmaking.
Working with Arrium Ltd. (formerly OneSteel), Prof. Sahajwalla’s earlier research into high temperature reactions in electric arc furnace steel making led to the invention and commercialization of a new steelmaking process utilizing waste. OneSteel’s plants in Sydney and Melbourne have transformed 1.6 million waste tyres into new steel to date, after testing proved that coke mixed with polymers such as rubber sourced from waste tyres performs better than metallurgical coke alone in electric arc furnaces. The process not only reduces the cost of raw materials but has enhances furnace efficiency, cutting power usage.
In addition to waste tyres — a significant environmental threat worldwide — steel makers can potentially absorb a wide range of other wastes — including large scale agricultural residue and various plastics, according to new UNSW research described in the Howe Memorial Lecture.
“That opportunity lies in the high temperatures of steel making furnaces. I am not suggesting we burn waste for energy. What I am proposing is that we leverage high temperatures to literally re-form waste materials into resources,” Professor Sahajwalla says.
“In doing so, steelmakers can play a leading role in globally significant, large scale recycling, without making fundamental changes to the way we manufacture steel – by re-purposing major waste streams as raw materials, simultaneously reducing production costs and enhancing the sector’s environmental credentials.”
She says the impetus for steel makers to innovate has never been greater due to the rising costs of raw materials, global pressures for competitive pricing and environmental considerations. Meanwhile, waste stockpile are accumulating at an accelerating rate.
“These are clearly incompatible trends which, if we persist with business as usual, will only increase tensions for the industry — making a clear case for change.”
