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By
Changlong Wang, et al., The
Conversation
May
26, 2023
Green hydrogen plants next to green
steelworks could boost efficiency and kickstart both industries
Credit: AI-generated image
The race to net zero is accelerating. Just last
week, United States President Joe Biden and Australian Prime Minister
Anthony Albanese unveiled a climate pact to boost cooperation. The
move signifies Australia is becoming a global leader in the renewable
energy roll-out and critical mineral supply.
Australia's rich iron ore deposits and cheap solar offer yet another
way we can lead. If we locate green hydrogen plants near green steel
facilities, we can shift the highly polluting steel industry away from
fossil fuels.
Our new research shows co-locating plants in sun-rich, iron-rich
places like Western Australia's Pilbara and South Australia's Eyre
Peninsula can help overcome the "first mover problem" for green
hydrogen: you can't have a hydrogen industry without buyers for it and
can't have buyers without hydrogen.
How would it work? Cheap solar power would be used to crack water into
hydrogen and oxygen. This green hydrogen would be piped a short
distance to a green steel plant, which uses hydrogen and electricity
to produce iron from the ore, and then an electric arc furnace to
smelt steel.
As we grapple with ways to decarbonize the steel sector, which uses 8%
of the world's energy and produces 7% of all energy-related carbon
emissions, we should urgently look for opportunities like this. As a
bonus, cheap power from solar and wind could make Australian-made iron
and steel more competitive globally.
Why is Australia so well placed?
We're the world's largest iron ore exporter. Under our red dirt lies
an estimated 56 billion tons of iron ore, as of 2021. Export earnings
reached A$133 billion in 2021–22. We also profit from the current
emissions-heavy way of making steel, by exporting $72 billion worth of
metallurgical coal.
Australia's potential as a green hydrogen provider is often promoted.
This year's federal budget allocated $2 billion to help make it a
reality. But our distance from the rest of the world makes pipelines
prohibitively expensive, and shipping hydrogen is difficult.
One solution is to use it here. Green hydrogen could make it possible
to onshore more iron and steel production.
Clean steelmaking will bring major change to our iron ore exports if
other countries take it up. Traditionally, 96% of our exports are the
most common type of ore, hematite. But this is currently not suited to
green steelmaking.
By contrast, magnetite ore only accounts for 4% of exports but can be
used in hydrogen-based green steelmaking.
Australia has vast reserves of magnetite ore, which previously hasn't
been in as much demand. But these ore bodies will become valuable
under the right economic conditions.
There’s a strong correlation between potential
hydrogen hubs and current and future iron ore operations.
And while we can solve steel's carbon problem with much better
recycling of this valuable material, we'll still need new steel
equivalent to about
50% of the current rate of production in 2050, due to issues with
converting scrap to reusable steel and removing contaminants.
Where should we co-locate these plants?
Major iron ore centers in the Pilbara and Eyre Peninsula already have
ports, a workforce and other infrastructure. That makes them the
logical first choice to co-locate solar, wind and hydrogen with iron
and steelmaking.
We modeled what would happen if these sites expanded wind and solar
power to make hydrogen and found the cost of green steel could drop
substantially to around $900 per ton by 2030 and $750 per ton by 2050.
By exporting green iron and steel, Australia could boost trade value,
reduce global greenhouse emissions, and link our exports with global
decarbonization efforts. Steel will become even more important given
it's so vital to manufacturing solar and wind.
Our recent
modeling has found key benefits in linking hydrogen hubs and
future iron ore operations.
First, it avoids the problem of transporting hydrogen, which,
especially in liquid form, can be expensive and energy-intensive to
transport.
And second, co-locating green hydrogen gives an immediate boost to the
industry. At present, green hydrogen is at the early stage before
increased scale and knowledge drives costs down.
To compete with coking coal, green hydrogen must get cheaper. Part of
this will come from falling renewable energy prices, better
electrolysers to make hydrogen, and carbon pricing. But part of it
will be locating hydrogen production where it can be used.
Choosing a site is the most important consideration. While access to
infrastructure and cheap ore are important, the cost of green steel
largely depends on low-cost hydrogen and cheap renewables.
Australia's state and federal governments are backing hydrogen as an
industry of the future. To go from paper to reality will require
policy incentives, low-interest loans, research and development
funding, and investment in infrastructure.
Policies to boost renewable energy and develop the hydrogen economy
will create a more conducive environment for green steel production.
If we combine our wealth of solar, hydrogen and iron ore, we can help
make global steel
production green, and also create the conditions for a green hydrogen export
industry.
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