CARBON-U · C-PCC Carbon Utilization Platform
CARBONU Co., Ltd. (CarbonU) — CCU mineral carbonation and circular-resource company: A technology company turning
into calcium carbonate.
At the core of CARBON-U is C-PCC (CO₂-converted precipitated calcium carbonate). Proven through government demonstration projects and patents, this technology recovers calcium from industrial by-products and fixes CO₂. The same technology extends to Tongyeong oyster-shell upcycling, to mine-void fill made from process residue, and to onshore CO₂ storage.
FROM WASTE TO VALUE.
FROM CARBON TO CIRCULARITY.
CaCO₃Oyster shells
OCC·CaCl₂Residue
Construction materials
C-PCC demonstrated · oyster shells in pilot · fill/storage future
C-PCC · Proven Core Technology
Patents · owner CARBONU Co., Ltd.
C-PCC: 4 registered patents · 6 pending
- No. 10-2444775 Method for producing precipitated calcium carbonate from waste concrete fines
- No. 10-2621557 Method for producing agglomerated calcium carbonate — 2023 Excellent Patent Grand Prize
- No. 10-2762214 Method for producing calcium carbonate from CBS dust
- No. 10-2779715 Method for producing precipitated calcium carbonate from lime-based by-products
2024 National Quality Innovation Competition — Gold Prize (NPD) · Excellent Quality Circle (Presidential)
All patents & awards →
Policy Fit · Korean Green Transformation (K-GX) · announced Oct 7, 2026
K-GX commits KRW 1,000 tn over 10 years — and C-PCC sits at its core priorities
C-PCC fixes flue-gas CO₂ in calcium carbonate without capture equipment
Turning by-products of high-emitting industries — steel slag, CBS dust — into materials
Regulation-Free Special Zone demonstration (KRW 17.7 bn) · oyster-shell upcycling
Tongyeong local waste → local production · CO₂ storage in abandoned mines (Future)
The Core · government-demonstrated · patented
Industrial By-products + CO₂
→ High-Value Calcium Carbonate
C-PCC (Carbon-converted Precipitated Calcium Carbonate) is a circular CCUS technology that makes high-purity calcium carbonate from calcium in industrial by-products and CO₂ in flue gas, and routes process residue to construction materials.
- No CO₂ capture equipment needed — C-PCC is produced from sources with 1%–100% CO₂ concentration (process feature)
- KTR accredited tests: purity 99.9% · whiteness 97 · six heavy metals not detected
- Replacing GCC cuts about 540–590 kg CO₂ per tonne of calcium carbonate (company estimate)
- About 44% of C-PCC by weight is converted CO₂ (CaCO₃ stoichiometry)
- Process water reused · residue used as construction feedstock
Calcium-rich resources once landfilled or left unused
CARBON-U proprietary process
High-purity calcium carbonate from flue-gas CO₂
Aiming for use as construction and fill materials
One Core Technology · Expanding Applications
From one proven core technology,
the next businesses follow
C-PCC — recovering calcium and fixing CO₂ — becomes a new product when the feedstock changes, and a carbon storage business when the residue is used.
Government-demonstrated · patented · production-verified
Calcium carbonate from by-products
Steel slag · CBS dust · desulfurization gypsum · Class C fly ash → high-purity calcium carbonate · construction materials
DemonstratedTongyeong oyster-shell upcycling
C-PCC process know-how applied to oyster shells — OCC · solid bio-CaCl₂ · high-purity CaCO₃
Pilot 500 t/yrConstruction materials · mine-void fill
Process residue → construction materials · ground/mine-void fill
DevelopmentOnshore CO₂ storage in abandoned mines
Residue filling + CO₂ injection · mineralization — mine reclamation and CCUS together
Future · 2031Why CARBON-U
What must be discarded and what must be replaced,
solved together in one process
Industry produces by-products and CO₂ every day, while the materials industry still relies on mined and imported feedstock. CARBON-U connects the two.
Waste that needs treatment
- Alkaline industrial by-products sent to landfill — steel slag, CBS dust, Class C fly ash
- Tongyeong generates 150,000–200,000 t of oyster shells a year (press reports) — the recycling facility handles about 80,000 t; more high-value outlets are needed
- CO₂ in flue gas
Materials that need replacing
- Ground calcium carbonate is made from mined or imported limestone
- Most solid calcium chloride sold in Korea is imported from China
- “Can waste and CO₂ become industrial feedstock again?”
Recover calcium, fix CO₂
- Fixing CO₂ with calcium from waste resources → calcium carbonate
- Oyster shells → OCC · high-purity CaCO₃ · solid CaCl₂
- Process residue → construction and fill materials
C-PCC Application · Tongyeong
C-PCC applied to oyster shells —
one feedstock, three products
We apply the calcium extraction and carbonation know-how proven on industrial by-products to Tongyeong oyster shells. This is not inventing a new technology — it is moving a proven process to a new feedstock.
Low-temperature calcined bio calcium carbonate — plastic filler · eco-friendly construction materials
Solid CaCl₂ 75% — eco-friendly de-icer · desiccant
High-purity calcium carbonate from oyster shells — high-performance filler · fine chemicals
Next Chapter · CO₂ Onshore Storage
Opened up by C-PCC residue:
Onshore CO₂ storage in abandoned mines
The residue left after calcium recovery can become a functional filler for abandoned mine voids, where CO₂ can be fixed as minerals. CARBON-U expands step by step from CO₂ utilization (CCU) to carbon mineralization and onshore storage (CCS).
Onshore CO₂ storage is a future business, not a commercial one today; the CO₂ uptake of the residue is to be confirmed through demonstration.
Mineralization · onshore storage →CO₂ fixed in calcium carbonate products
Process residue + CO₂ → construction · fill materials
Mine-void filling · CO₂ injection · mineral stabilization · mine reclamation
Brand Architecture
A company built on four pillars
CO₂ conversion, resource circularity, sustainable materials, carbon zero — every CARBON-U technology and business connects on these four pillars.
CO₂ into materials
C-PCC fixing CO₂ in calcium carbonate · carbon mineralization
02 · RESOURCE CIRCULARITYWaste back into resources
Landfilled and stockpiled by-products and oyster shells turned into calcium feedstock
03 · SUSTAINABLE MATERIALSHigh-value sustainable materials
A portfolio of calcium-based industrial materials that replace mined and imported feedstock
04 · CARBON ZEROToward carbon neutrality · zero waste
From CO₂ utilization to onshore storage — a circular structure that uses even the residue
Technology Readiness
What has been proven, and what we will prove
CARBON-U does not call every technology “commercialized.” We disclose each technology's stage clearly.
TODAY
- C-PCC from industrial by-products · 5 t/day production verified
- Regulation-Free Special Zone demonstration (2021–2023)
- 3 national R&D projects · patents 4+6
- Oyster-shell three-product development started
NOW
- OCC 500 t/yr pilot (Tongyeong)
- Measuring quality, yield and cost on oyster shells
- Accredited test reports · certification (GR · Eco-label, etc.)
- Customer sample tests · quotations
NEXT
- Bio CaCl₂ commercialization
- High-purity CaCO₃ (oyster shells → by-products)
- OCC 20,000 t/yr commercial line (upon passing the gate)
- Mine-void · ground fill
FUTURE
- Onshore CO₂ storage business
- Carbon Circularity Platform · multi-feedstock hubs
- Strategic alliances with major corporations
- KOSDAQ listing target (2032)
※ Years for NEXT and FUTURE items are company plans and may change with pilot results and financing.
Zero-Waste Direction
Even what remains after extraction
becomes the next industry's feedstock
After calcium is recovered, the remaining process residue can be used as construction materials, ground fill and mine-void fill. With this structure, CARBON-U aimsfor zero waste.
Residue utilization rates are to be confirmed through demonstrations by feedstock and application.
See the zero-waste structure →Partnership
Ways to work with us
Government · local authorities · public agencies
Oyster-shell upcycling, by-product circulation, CCUS demonstration, government R&D and policy pilots
Policy & Public Partnership →Large & mid-sized companies
ESG & Scope 3, by-product treatment, CO₂ utilization, sustainable material purchasing, joint R&D
Business Partnership →Investors
From C-PCC technology assets → OCC pilot → Carbon Circularity Platform
Investment/IR inquiry →Local communities
Turning Tongyeong's oyster shells into locally made materials and jobs
Regional Impact →Company Profile
CARBON-U Company Profile 2026
C-PCC core technology · quality tests · CO₂ reduction · demonstration · patents · K-GX · technology roadmap — 23 pages, English
Let's build a circular carbon future
Let's remake resources together
and create new value from carbon.
Feedstock supply, joint demonstration, material purchase, investment — we can start the conversation at any stage.