Potential of Pinewood Biochar as an Eco-Friendly Reducing Agent in Iron Ore Reduction

Area of Science:

• Materials Science
• Metallurgical Engineering
• Sustainable Chemistry

Background:

• Carbothermal reduction of iron ore traditionally relies heavily on coke.
• Growing demand for sustainable practices necessitates exploring alternative reducing agents.
• Biochar, a biomass-derived material, presents a potential eco-friendly substitute.

Purpose of the Study:

• To investigate the optimal proportion of pinewood biochar (PW) and coke as reducing agents in iron ore carbothermal reduction.
• To evaluate the efficiency of biochar as a partial or complete replacement for coke.
• To determine the ideal conditions for maximizing metallization using biochar.

Main Methods:

• Characterization of raw materials (pinewood biochar, coke, iron ore) using TGA, elemental analysis, XRF, and SEM.
• Carbothermal reduction experiments at high temperatures to assess metallization efficiency.
• Chemical analysis of metallized pellets for total iron (T.Fe), metallic iron (M.Fe), and residual oxides (Fe2O3, FeO).

Main Results:

• The addition of pinewood biochar significantly improved the carbothermal reduction efficiency.
• Optimal reduction was achieved at 1300°C with a 20-minute holding time, using a mixture of 20% coke and 80% pinewood char.
• Pinewood biochar demonstrated effectiveness as a reducing agent, increasing metallization.

Conclusions:

• Pinewood biochar is a viable alternative reducing agent to coke in iron ore carbothermal reduction.
• Utilizing biochar can reduce overall coke consumption in iron production, contributing to carbon mitigation.
• Biomass-derived materials offer a sustainable pathway for the iron and steel industry.