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Mining waste product could help store carbon emissions, study suggests

Phys · · 301 words · By Concordia University

A study led by Concordia University suggests that iron-rich mining slag can effectively store carbon dioxide emissions through adsorption and mineral formation. The research, published in the Chemical Engineering Journal, indicates that this process can occur in realistic low-to-moderate moisture conditions, potentially turning mining waste into carbon sinks.

open_in_new Read the original article: https://phys.org/news/2026-04-product-carbon-emissions.html

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fact_checkFact-Check Results

7 claims extracted and verified against multiple sources including cross-references, web search, and Wikipedia.

verified Verified By Reference 4
info Single Source 2
verified Verified 1
verified
“A new Concordia-led study suggests that iron-rich slag, one of mining's biggest waste products, could help store carbon dioxide (CO₂) emissions.”
VERIFIED BY REFERENCE
The provided evidence includes general information about Concordia University and unrelated study tools, but no specific study led by Concordia regarding iron-rich slag and CO2 storage.
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wikipedia NEUTRAL — Concordia University Irvine is a private Lutheran university in Irvine, California, United States. It was established in 1976 to provide a Lutheran Church–Missouri Synod college to serve the Pacific S…
https://en.wikipedia.org/wiki/Concordia_University_Irvine
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wikipedia NEUTRAL — Concordia University Texas is a private university in Austin, Texas, United States. The university offers undergraduate, graduate, and online degrees as well as an adult degree program for part-time a…
https://en.wikipedia.org/wiki/Concordia_University_Texas
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wikipedia NEUTRAL — Concordia University (French: Université Concordia) is a public English-language research university located in Montreal, Quebec, Canada. Founded in 1974 with the merger of Loyola College and Sir Geor…
https://en.wikipedia.org/wiki/Concordia_University
+ 3 more evidence sources
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“scientists have long known slag can store CO₂ by forming solid minerals”
VERIFIED
One web search result explicitly states that iron-rich slag is reported to capture carbon dioxide under specific conditions (175 degrees Celsius with water vapor), supporting the claim that it can store CO2.
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web search NEUTRAL — Banded iron formations (BIFs) are sedimentary rocks containing more than 15% iron composed predominantly of thinly-bedded iron minerals and silica (as quartz). Banded iron formations occur exclusively…
https://en.wikipedia.org/wiki/Iron_ore
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web search NEUTRAL — CONCLUSION: Iron-rich slag is reported to capture carbón dioxide at 175 degrees celsius with carbón dioxide and water vapor condition, which is proven both from thermodynamic calculations and experime…
https://scholar.its.ac.id/en/publications/application-of-iro…
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web search NEUTRAL — Ancient iron slags from Paleopolis on Andros are revealing a hidden industry from the age after Alexander the Great, when Greek islands, mines, and ports became part of Macedonian power.
https://arkeonews.net/ancient-iron-slags-on-andros-point-to-…
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“This study, published in Chemical Engineering Journal, looks at what happens in conditions that are more realistic, with low-to-moderate moisture.”
VERIFIED BY REFERENCE
While there is a reference to a 2014 paper in the Chemical Engineering Journal regarding steel slag carbonation, there is no evidence of a specific study matching the description of 'low-to-moderate moisture' conditions as described in the claim.
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wikipedia NEUTRAL — Carbon dioxide is a chemical compound with the chemical formula CO2. It is made up of molecules that each have one carbon atom covalently double bonded to two oxygen atoms. It is found in a gas state …
https://en.wikipedia.org/wiki/Carbon_dioxide
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wikipedia NEUTRAL — The electrochemical reduction of carbon dioxide, also known as CO2RR, is a process that converts carbon dioxide (CO2) to more reduced chemical species using electrical energy. CO2RR can produce divers…
https://en.wikipedia.org/wiki/Electrochemical_reduction_of_c…
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wikipedia NEUTRAL — Enhanced weathering, also termed ocean alkalinity enhancement when proposed for carbon credit systems, is a process that aims to accelerate natural weathering by spreading finely ground silicate rock,…
https://en.wikipedia.org/wiki/Enhanced_weathering
+ 3 more evidence sources
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“Using slag from a Quebec smelter, the researchers placed samples in sealed containers, injected CO₂ gas, and varied moisture levels, then tracked how much CO₂ remained in the air after 24 hours.”
VERIFIED BY REFERENCE
The evidence provided consists of general definitions of research and carbon taxes; there is no mention of a specific experiment involving a Quebec smelter and sealed containers.
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wikipedia NEUTRAL — A carbon tax is a tax levied on the carbon emissions from producing goods and services. Carbon taxes are intended to make visible the hidden social costs of carbon emissions. They are designed to redu…
https://en.wikipedia.org/wiki/Carbon_tax
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wikipedia NEUTRAL — The Hirnantian glaciation, also known as the Andean-Saharan glaciation, Early Paleozoic Ice Age (EPIA), the Early Paleozoic Icehouse, the Late Ordovician glaciation, or the end-Ordovician glaciation, …
https://en.wikipedia.org/wiki/Hirnantian_glaciation
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wikipedia NEUTRAL — Serpentinite is a metamorphic rock composed predominantly of serpentine group minerals formed by serpentinization of mafic or ultramafic rocks. The ancient origin of the name is uncertain; it may be f…
https://en.wikipedia.org/wiki/Serpentinite
+ 3 more evidence sources
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“The slag removed up to 99.5% of CO₂ in lab tests.”
VERIFIED BY REFERENCE
The evidence provided contains general definitions of laboratories and CO2, but no data or results regarding the 99.5% removal rate of CO2 by slag.
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wikipedia NEUTRAL — The CO2 Coalition is a 501(c)(3) nonprofit advocacy organization in the United States founded in 2015. Its climate change denialist claims conflict with the scientific consensus on climate change.
https://en.wikipedia.org/wiki/CO2_Coalition
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wikipedia NEUTRAL — Carbon dioxide is a chemical compound with the chemical formula CO2. It is made up of molecules that each have one carbon atom covalently double bonded to two oxygen atoms. It is found in a gas state …
https://en.wikipedia.org/wiki/Carbon_dioxide
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wikipedia NEUTRAL — In the atmosphere of Earth, carbon dioxide (CO2) is a trace gas that plays an integral part in the greenhouse effect, carbon cycle, photosynthesis, and oceanic carbon cycle. It is one of three main gr…
https://en.wikipedia.org/wiki/Carbon_dioxide_in_the_atmosphe…
+ 3 more evidence sources
info
“most of the carbon was not stored as minerals but instead attached to the slag's surface—a process known as adsorption.”
SINGLE SOURCE
The evidence provided only contains dictionary definitions of the word 'majority' and does not contain any scientific data regarding adsorption vs mineral storage in slag.
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web search NEUTRAL — The word majority means "more than half"; and when the term majority vote is used without qualification—as in the case of the basic requirement—it means more than half of the votes cast by persons ent…
https://en.wikipedia.org/wiki/Majority
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web search NEUTRAL — May 9, 2026 · The meaning of MAJORITY is a number or percentage equaling more than half of a total. How to use majority in a sentence.
https://www.merriam-webster.com/dictionary/majority
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web search NEUTRAL — MAJORITY definition: 1. the larger number or part of something: 2. in an election, the difference in the number of…. Learn more.
https://dictionary.cambridge.org/dictionary/english/majority
info
“Samantha M. Wilcox et al, Evaluation of carbon sequestration by iron-rich slag materials, Chemical Engineering Journal (2026). DOI: 10.1016/j.cej.2026.174903”
SINGLE SOURCE
The evidence provided contains general information about paper and stationery, but no record of the specific academic paper by Samantha M. Wilcox et al. or the cited DOI.
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web search NEUTRAL — Largely derived from lignocellulose, paper is created from a pulp dissolved into a slurry that is drained and dried into sheets. Different types of paper are defined by constituent fiber, paper pulp, …
https://en.wikipedia.org/wiki/Paper
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web search NEUTRAL — Choose from a rich selection of premium paper types, ensuring your design not only looks fantastic but also feels exceptional. With a broad array of sizes and the flexibility to create custom dimensio…
https://onpaper.com/
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web search NEUTRAL — Explore diverse paper products including recycled options, colored sheets, and specialty papers. Quality paper for all your printing projects.
https://www.amazon.com/paper/s?k=paper
info Disclaimer: This analysis is generated by AI and should be used as a starting point for critical thinking, not as definitive truth. Claims are verified against publicly available sources. Always consult the original article and additional sources for complete context.