Tadeu Carneiro

Chairman and CEO, Boston Metal · 1 appearance on the record.

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executiveengineerLinkedIn ↗bostonmetal.com ↗

He leads Boston Metal, a company commercializing Molten Oxide Electrolysis technology to decarbonize steel production. Before Boston Metal, he spent nearly 30 years at Brazilian niobium producer CBMM, serving as CEO and expanding its revenues from $100 million to over $2 billion.

16statements → 9claims → 5claims resolved → 100%fully supported → 4.06/5average certainty → 1.56/5average debate potential → ≈4.5/5argument clarity, estimated →

5 supported 0 partly supported 0 contradicted 3 not yet assessed 1 not checkable as stated how the 9 claims stand · each chip opens the sources

1 prediction · 8 assertions · 2 insights · 4 disclosures · 1 what if · every statement was checked. The prediction and assertions are the 9 claims: statements the public record can support or contradict. 5 are resolved, 3 are not yet assessed, and 1 names no date, number or outcome precise enough to check. Everything else (opinions, insights, what ifs, disclosures) can never be settled by the record, so it carries no assessment.

The record, in short

What the tape says about how Tadeu argues and how the claims held up. Everything they said, and everything said about them, is in the tabs below.

Their most notable supported claim

Assertion Supported
Carneiro: Boston Metal technology extracts high-value metals from low-concentration feedstocks
“The most beautiful thing about our technology is we don't have, we don't need high concentration. We can retrieve this value from lower Concentration, ah, of, in this feedstocks.”
Tadeu Carneiro Nov 7, 2025 ▶ 32:36 Boston Metal’s path to carbon-free steel

How they sound: not measured why? →

We measure speaking style by listening to the audio itself, and a fair number needs at least 2,000 words from one person on tape we have measured. There is too little of Tadeu Carneiro on measured tape to publish a rate. This says nothing about how they speak.

Everything Tadeu Carneiro said on the Green Blueprint that made the record, most notable first. Filter by type, assessment or year in the ledger →

Disclosure
Carneiro: Boston Metal is developing zero-emission electrolytic steelmaking technology
“Well, we are developing a technology that will eliminate all these emissions. No carbon involved at all as a reducing agent, so we use electricity instead, and therefore if the electricity is clean, you take care of scope one and scope two in manufacturing ste…”
Tadeu Carneiro Nov 7, 2025 ▶ 1:33 Boston Metal’s path to carbon-free steel
Prediction Open · timeframe Dec 2030
Boston Metal aims to unlock commercial steel applications by 2029
“If you know, if we don't find non-dilutive funds earlier, that cell will be running in twenty-twenty-eight, which will then unlock the commercial application of the technology for steel in 29, twenty-thirty.”
Tadeu Carneiro Nov 7, 2025 ▶ 16:45 Boston Metal’s path to carbon-free steel
Assertion Open · timeframe Nov 2028
Carneiro: Boston Metal critical metals process cuts carbon footprint by 90%
“Ah, it is at the same time that, that we will have a carbon footprint that at one 10th of the incumbents today.”
Tadeu Carneiro Nov 7, 2025 ▶ 18:32 Boston Metal’s path to carbon-free steel
Assertion Open · timeframe Nov 2028
Carneiro: Boston Metal produces 2x to 3x more metal per ore volume
“The same amount of ore you can produce twice or three times the amount of metal because our process is more efficient.”
Tadeu Carneiro Nov 7, 2025 ▶ 19:46 Boston Metal’s path to carbon-free steel
Assertion Not checkable as stated
Boston Metal ran pilot cells with modular anodes over 30 days in 2024
“That milestone we reached in, ah, we delivered in, in twenty-twenty-four, ah, when we have five, five, six runs that last more than a month with, ah, the first generation of industrial modular anode in a single pilot cell that, that survived more than 30 days.”
Tadeu Carneiro Nov 7, 2025 ▶ 15:26 Boston Metal’s path to carbon-free steel
Disclosure
Boston Metal cap table includes BHP, Vale, ArcelorMittal, Aramco, and Microsoft
“We have lots of giants in in our cup table today. So, you know, the largest mining company in the world, BHP, the largest supplier of iron ore, Vale from Brazil, the largest international steelmaking company, ArcelorMittal. Then you have Saudi Aramco, you have…”
Tadeu Carneiro Nov 7, 2025 ▶ 20:36 Boston Metal’s path to carbon-free steel
What-if
Carneiro: Boston Metal could sign offtakes for 100% of critical metals output today
“If we wanted, we would have a hundred percent of the production signed in offtakes today, because this critical metals, ah, the tier one trading, trading companies in the world, they're all interested in them, and we are very well connected to them.”
Tadeu Carneiro Nov 7, 2025 ▶ 23:35 Boston Metal’s path to carbon-free steel
Insight
Carneiro: Data center buildouts are impossible without tantalum
“With all these, ah, data centers that Everyone wants to have all over the place without tantalum. Forget about it.”
Tadeu Carneiro Nov 7, 2025 ▶ 24:27 Boston Metal’s path to carbon-free steel
Assertion Supported
Carneiro: Boston Metal technology extracts high-value metals from low-concentration feedstocks
“The most beautiful thing about our technology is we don't have, we don't need high concentration. We can retrieve this value from lower Concentration, ah, of, in this feedstocks.”
Tadeu Carneiro Nov 7, 2025 ▶ 32:36 Boston Metal’s path to carbon-free steel
Insight
Carneiro: Scaling FOAK plants fails when founders solve all variables at once
“So if you try to solve all the variables at once, It is going to be very difficult, so you have to isolate some of the variables, the most critical ones, show that you are able to solve, and then keep improving, right? So that's how you need to do, ah, attempt…”
Tadeu Carneiro Nov 7, 2025 ▶ 35:30 Boston Metal’s path to carbon-free steel
Assertion Supported
Boston Metal's core electrolysis process was originally designed for the moon
“They wanted to run this process in the moon.”
Tadeu Carneiro Nov 7, 2025 ▶ 5:36 Boston Metal’s path to carbon-free steel
Assertion Supported
Carneiro: Steel production accounts for over 7% of global CO2 emissions
“Still always as the high star, multi-trillion dollar business, more than seven percent of CO two emissions and responsible for that.”
Tadeu Carneiro Nov 7, 2025 ▶ 9:53 Boston Metal’s path to carbon-free steel
Assertion Supported
Boston Metal commissioned a 10-anode demonstrator in Woburn producing 1-2 tons monthly
“So now we built this 10 anode cell that is an industry demonstrator in Woburn. We, and we commissioned that cell in February this year. This industrial demonstrator It's capable of producing one to two tons per month of liquid metal”
Tadeu Carneiro Nov 7, 2025 ▶ 16:04 Boston Metal’s path to carbon-free steel
Disclosure
Carneiro: Boston Metal's Brazil plant will have 10,000 tons annual capacity
“The first plant will have approximately 10,000 tons a year of ferro-alloy capacity, extracting these values from Slags that, ah, as I described to you, they don't have any value today or any technology that can retrieve those value, ah, metals that, that are t…”
Tadeu Carneiro Nov 7, 2025 ▶ 18:04 Boston Metal’s path to carbon-free steel
Assertion Supported
Carneiro: Investor ArcelorMittal consumes more material annually than Boston Metal produces
“If you look at our Cap table, and you take Arcel or Mito, they consume more of the materials per year that, that we were going to produce, right?”
Tadeu Carneiro Nov 7, 2025 ▶ 27:52 Boston Metal’s path to carbon-free steel
Disclosure
Carneiro: Boston Metal needs $100M CapEx to double Brazil plant capacity
“Well, at the point that we are now, a hundred million dollars, I would build another plant. Right away. It's very successfully because it's very profitable, and that's the size of the CapEx that I need to double the capacity I am having in Brazil now. So at th…”
Tadeu Carneiro Nov 7, 2025 ▶ 36:12 Boston Metal’s path to carbon-free steel

Appearances (1)

EpisodeDateSpeaking time
Boston Metal’s path to carbon-free steel Nov 7, 2025 25m
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