Australia–India Research Advances Greener Steel Manufacturing Through Agricultural Waste Trial

Why It Matters

Replacing coal with agricultural waste offers a scalable pathway to decarbonise one of the fastest‑growing steel markets, reducing both emissions and reliance on fossil fuels.

Key Takeaways

• Rice husk pellets replace up to 10% coal in gasifiers
• Trial maintained syngas output without performance loss
• Potential emissions cut up to 50% for Indian steel
• India generates 228 Mt agricultural residue annually
• Partnership aims to expand biomass use to regional plants

Pulse Analysis

India’s steel sector, projected to reach 500 Mt capacity by 2047, remains one of the world’s most carbon‑intensive industries, emitting roughly 2.55 t CO₂ per tonne of steel. Traditional blast‑furnace and direct‑reduced iron processes rely heavily on coal, driving both climate impact and air‑quality concerns. As the country grapples with a surplus of agricultural residues—estimated at over 228 million tonnes annually—policymakers and industry leaders are seeking ways to convert this waste into a clean energy feedstock, positioning biomass as a cornerstone of the green‑steel transition.

The CSIRO‑IISc trial demonstrated that rice husk pellets can be gasified to produce synthesis gas that effectively reduces iron ore when blended at 5‑10% with coal in commercial gasifiers. Performance metrics showed unchanged syngas flow rates and temperature stability, confirming that biomass integration does not compromise operational efficiency. Economically, the approach leverages locally sourced waste, reducing fuel import costs and creating new revenue streams for rural communities that currently burn residues in fields. If replicated across India’s extensive steelmaking network, the technology could cut sector emissions by up to half, equating to a 357 Mt CO₂ reduction each year.

Beyond the immediate environmental gains, the partnership signals a broader shift toward circular industrial ecosystems. The interactive mapping tool released by CSIRO links regional biomass availability with steel plant locations, facilitating strategic planning for supply chain logistics. Future phases aim to test additional feedstocks and extend the model to smaller DRI facilities, potentially accelerating India’s commitment to carbon‑neutral steel by 2050. International investors are watching closely, as the success of this biomass‑gasification pathway could inform green‑steel policies worldwide, reinforcing the Australia‑India collaboration as a benchmark for cross‑border innovation in low‑carbon manufacturing.