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SA clay deposits unearth nanoparticle and carbon capture potential

Regional Showcase

Australia is on the cusp of commercialising a rare nanoparticle with huge global potential to help capture carbon and water pollutants.

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Large deposits of halloysite-kaolin clay found on the Eyre Peninsula  are yielding unique microscopic tubular particles with sought-after absorption properties.

Natural Nanotech Pty Ltd, an Adelaide-based startup, is now launching research and development work to take the product to market.

“We’ve just signed a three-year agreement to scale up laboratory test work completed previously to a commercial scale,” company director Dr Tony Belperio said.

“If successful, it could position Australia as the dominant global manufacturer and supplier of a new product with diverse environmental applications.”

The tiny particles found in natural clay are called halloysite, and Dr Belperio said they could potentially replace expensive manufactured versions of nanotubes currently being used in a wide range of new technologies.

“With the rest of the world’s supply of natural halloysite limited, South Australia is uniquely home to large deposits near Streaky Bay,” Dr Belperio said.

“(This potential) has been known about for a few years but the halloysite is very rare globally, what we’ve found in southern Australia, near Streaky Bay, are really big deposits, hundreds of millions of tonnes.”

Natural Nanotech Pty Ltd is jointly owned by South Australian junior exploration companies Minotaur Exploration and Andromeda Metals.

Its first research project will focus on developing a commercially attractive solution to carbon capture from the atmosphere and to selective pollutants in water.

Dr Belperio said these applications already had been successfully demonstrated at laboratory scale by the team at the University of Newcastle in New South Wales, and up-scaled test work at industrial sites and commercialisation trials was now planned.

Kaolin clay is used for high-end ceramics, with demand in China and Southeast Asia for making expensive vases or tea sets, along with being used for brightening paint or paper.

“Instead of selling this as a bulk product we decided we should extract the nanotubes,” Dr Belperio said.

The ceramic industry would still be a prime customer for the product, the nanotubes have strengthening ability, and other target markets would include the water filtration industry for cleaning poor quality water.

“What is just hitting the headlines is the capture of CO2 out of the atmosphere, there’s a company in the United States experimenting and we believe they are using (manufactured) carbon nanotubes,” Dr Belperio said.

He said there was potential for the nanotubes to be used in air conditioner-sized units that could reduce a company’s carbon footprint by capturing carbon out of the air.

Once the current research project was up and running, Dr Belperio said the company was also looking at starting research into the use of halloysite for safe storage of hydrogen.

Andromeda Metals Ltd and Minotaur Exploration entered a formal joint venture agreement over Minotaur’s Poochera tenements in 2018.

Poochera is a kaolin district of global significance. It contains many kaolin deposits with unique characteristics, including the deposit of “bright white” kaolin at Carey’s Well, some 45km east of Streaky Bay.

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