With India implementing its mandatory Carbon Credit Trading Scheme (CCTS) and striving for net-zero industrial emissions, hard-to-abate sectors like cement, steel, thermal power, and fertilizers face urgent decarbonization mandates. Carbon Capture, Utilization and Storage (CCUS) via mineral carbonation has emerged as the most commercially viable solution for Indian heavy industry.
Rather than injecting captured CO2 underground (which requires rare geological formations), flue gas mineralization converts captured gaseous CO2 into solid, high-purity synthetic limestone and calcium carbonate. This guide provides a full engineering and financial blueprint for establishing a commercial CCUS mineralization plant in India in 2026.
Double Revenue Model: CCUS mineralization plants generate dual income streams: 1) Selling high-grade Precipitated Calcium Carbonate (PCC) to paper, paint, and plastics industries, and 2) Earning tradeable Carbon Credit Certificates (CCCs) under BEE CCTS regulations.
1. Technology Process: Amine Absorption & Mineralization
Commercial CCUS mineralization operates across four integrated chemical engineering stages:
- Flue Gas Pre-treatment: Industrial exhaust gas (10%–25% CO2) is scrubbed to remove SOx, NOx, and particulates, then cooled to 40°C.
- Amine Solvent Absorption: Pre-treated flue gas passes through an absorption column where Monoethanolamine (MEA) or energy-efficient piperazine-promoted solvents selectively bind CO2.
- Desorption & CO2 Compression: Rich solvent is heated in a stripper column, releasing 99.5% pure gaseous CO2 while lean solvent recycles back to the absorber.
- Mineralization Reaction & Crystallization: Pure CO2 is bubbled through a slurry of industrial lime sludge or fly ash inside a high-pressure loop reactor, precipitating pure Calcium Carbonate (CaCO3).
2. CapEx Breakdown for a 100 TPD CO2 Capture & Mineralization Plant
Capital outlay for establishing a 100 Ton Per Day (33,000 Tons/year) CO2 capture and mineralization unit:
| Equipment / Infrastructure | Specifications | Cost (₹ Crore) |
|---|---|---|
| Land & Industrial Civil Works | 2.5 Acres land, 25,000 sq. ft. process shed & chemical storage yard | ₹8.5 Cr |
| Flue Gas Pre-scrubber & Blower Array | FRP wet scrubber, ID fans, and heat exchangers | ₹4.8 Cr |
| Amine Absorption & Stripping Columns | Stainless steel 316L structured packing columns with reboiler | ₹12.5 Cr |
| High-Pressure Mineralization Loop Reactor | 25 m³ jacketed carbonation reactor with gas induction impeller | ₹7.2 Cr |
| Centrifugal Decanter & Rotary Spray Dryer | Slurry dewatering centrifuge & sanitary flash dryer | ₹5.5 Cr |
| CO2 Compression & Chilled Storage Skid | 3-stage reciprocating compressor & 50-ton liquid CO2 tank | ₹4.2 Cr |
| Working Capital & Initial Amine Solvent Stock | Specialty solvent chemical charge, lime sludge stock, lab tools | ₹5.3 Cr |
| Total Estimated CapEx | Turnkey Unit | ₹48.0 Cr |
Waste Heat Integration: Integrating the amine stripper reboiler with waste steam from the host factory's boilers reduces operating energy consumption by up to 60%, lowering capture cost below $32 per ton of CO2.
3. Product Economics & Revenue Streams
Annual financial yields from processing 33,000 Tons of CO2 into 75,000 Tons of synthetic Calcium Carbonate:
| Revenue Stream | Annual Production / Credit Volume | Unit Market Price | Annual Revenue (₹) |
|---|---|---|---|
| Precipitated Calcium Carbonate (PCC) | 45,000 Tons / year | ₹8,500 / Ton | ₹38.25 Crore |
| Construction Grade Synthetic Aggregate | 30,000 Tons / year | ₹2,200 / Ton | ₹6.60 Crore |
| CCTS Carbon Credit Certificates (CCCs) | 33,000 Credits / year | ₹1,800 / Credit | ₹5.94 Crore |
| Total Annual Gross Revenue | All Revenue Channels | - | ₹50.79 Crore |
4. Financial Viability & Payback Period
- Operating Expenses (Solvent makeup, power, lime sludge, labor, maintenance): ₹21.5 Crore/year.
- Net Operating EBITDA: ₹29.29 Crore
- EBITDA Margin: ~57%
- Net Debt Payback Period: 2.4 Years.
Frequently Asked Questions (FAQs)
What is Carbon Capture, Utilization and Storage (CCUS) mineralization?
CCUS mineralization captures CO2 directly from industrial exhaust flue gases (thermal power, cement, steel, chemical plants) using amine solvents or direct gas scrubbing, and chemically reacts the captured CO2 with industrial waste minerals (fly ash, slag, or lime sludge) to form permanent, inert synthetic calcium carbonate (limestone).
What is the capital setup cost for a 100-ton-per-day CO2 capture and mineralization unit in India?
Establishing a commercial 100 TPD CO2 capture and mineralization plant costs between ₹22 Crore and ₹52 Crore depending on flue gas CO2 concentration, heat integration, and synthetic limestone drying lines.
How does India's Carbon Credit Trading Scheme (CCTS) monetize CCUS plants?
Under CCTS managed by the Bureau of Energy Efficiency (BEE), verified reduction of CO2 emissions earns Carbon Credit Certificates (CCCs). Each credit represents 1 Metric Ton of CO2 avoided/sequestered, which can be traded on domestic carbon exchanges (IEX) to obligated industrial polluters.
What are the commercial end-products of CO2 mineralization?
1) Precipitated Calcium Carbonate (PCC) used in paper, paint, plastics, and pharma @ ₹12,000–₹22,000/ton, 2) Carbonated synthetic aggregate used in green concrete manufacturing @ ₹1,500–₹3,200/ton, and 3) Tradeable Carbon Credits.
What are the government incentives for CCUS adoption in India?
The NITI Aayog CCUS Framework offers accelerated depreciation (80%), concessional green financing from IREDA/PFC, and priority R&D capital support under the National Decarbonization Mission.