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Slag & incinerator bottom ash processors

Want to team up to decarbonize the industry? Explore how you can combine business yield with sustainability and innovation.

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Neustark turns mineral waste materials into a carbon sink.

In more literal terms: We capture and store CO₂ by working with source and storage partners located in close proximity to each other.

But storing atmospheric CO₂ in mineral waste materials such as demolition concrete, slags and bottom ashes?

Indeed! It’s a process that we’ve proven to be both commercially and ecologically viable – as the first player to do so worldwide. We already have numerous storage sites in operation across Europe and are scaling up quickly.

And that’s where we need you. You have the slags and bottom ashes – we have the technology to add on.

We install our technology alongside your existing production process and create an additional income stream for you. Nothing is disrupted – it’s an add on. For your business, for your sustainability efforts, and for the climate.

Storing CO₂ at partnering processors, recyclers, urban miners and landfills

Processors and recyclers bring slags, bottom ashes and other mineral waste materials to their plants, where they screen and/or crush the material and then separate metals – a process also known as urban mining – to prepare for further use.

And that’s where neustark comes into play: by adding our technology onto the existing production process, we can inject CO₂ into the slags and bottom ashes whilst these granules are being recycled.

Our technology accelerates and enhances the mineralization process, turning CO₂ into limestone – and thus permanently binding it to the minerals in the slag.

We do not disrupt the existing recycling process, but just connect our tech as an added step (see below for solution types). The granules injected with CO₂ can be used as per usual process, e.g. to build roads or to store in a landfill.

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An additional advantage: reduced risk of leaching

In addition to the storage of CO₂, our mineralization process holds another big advantage: harmful substances such as heavy metals are stabilized better within the minerals and thus contained in the granules, thereby significantly reducing the risk of leaching.

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Result: added value for all!

It’s a win-win-win: processors and recyclers profit from an additional revenue stream that also helps their sustainability action.

Neustark can remove CO₂ from the atmosphere. Both businesses and the climate benefit.

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Why work with neustark?

Be a pioneer

Carbon removal is becoming a big industry, fast. You have the power to scale up the industry – and be one of the first to do so. We have the technology. Let’s lead the way, together.

Make your business (even more) sustainable

Whether your employees, investors, clients or regulators – all stakeholder groups want to see companies implement tangible climate action now.

Impact today – and tomorrow

Unlike other carbon utilization or removal methods, neustark’s solution is ready today. By joining forces, you can have a direct impact on your business right away.

Additional revenue stream

Partnering with neustark helps you to create a new business field and, in the mid-term, generate an additional income stream.

So how does the process of working together look like?

  • ​We determine the ecological and commercial potential based on the specific framework for your business.
  • ​We validate the key assumption behind the calculated potential through a lab-scale test series. If needed, we validate those tests at a larger scale.
  • ​Together, we design and implement a mobile or stationary solution that ideally fits into your existing infrastructure and processes.
  • We construct the plant, and once ready, you take on ownership.
  • You operate the plant, and neustark works with you to store many tons of CO2 over the years!

Our solution types

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Row dosing units (hoppers)

In a joint venture with Alluvia & Vigier Beton Seeland Jura, we built a large-scale storage plant consisting of three row dosing (hopper) units. For direct access to demolished concrete, the plant was built at a demolition site (paper factory in Biberist, Switzerland). In operation since May 2023, the plant has a yearly storage capacity of around 1000t of CO₂.

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Silo (stationary)

In collaboration with Spross Transport & Recycling, neustark created and deployed a silo storage plant at Spross’ recycling site in the heart of Zurich. Its location makes for short transport distances between source point and storage site.

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Mobile storage site

The plant constructed with Holcim (Switzerland) AG is a mobile storage site of the new generation. Originally stationed in central Switzerland, this plant was built to be moved between various Holcim concrete recycling sites in Switzerland to allow for multiple and optimal storage efficiency.


  • Neustark’s solution is based on the well-researched chemical process known as natural mineralization or carbonation. Our technology accelerates this process from over 1000 years to just a few hours while multiplying the average CO₂ uptake.

    For more information, see How our solution works.

  • We have adaptable business models as well as product types, according to your needs.

    In general, neustark constructs the storage technology at your plant. Once finished, the storage site belongs to you, the recycler. An initial, lump-sum investment to purchase the technology is needed. This investment is then counterbalanced by neustark paying you to utilize your storage site. Over the course of a few years, the initial investment is turned into profit for you.

  • Besides making your business (even more) sustainable, creating an additional revenue stream and of course, permanently storing CO₂ the mineralization process holds another big advantage regarding the process of Incinerator Bottom Ash IBA. Harmful substances such as heavy metals are stabilized better within the minerals and contained in the granules through our mineralization, thereby significantly reducing the risk of leaching (accelerated and enhanced weathering).

  • We partner with biogas plant to filter out the CO₂ that is created during the plant’s production process. We then liquefy the captured CO₂ to then transport it to the nearby storage sites.

  • Today we store around 10 kg of CO₂ per ton of demolished concrete. ​We are of course continuously working on further optimizing this figure.

Are you interested?

Reach out today to explore how we can partner up!

Simon Staufer

Simon Staufer

Business Development Manager

Book an appointment online