Ibitoye, et al (2024) An overview of biocharBiochar is a carbon-rich material created from biomass decomposition in low-oxygen conditions. It has important applications in environmental remediation, soil improvement, agriculture, carbon sequestration, energy storage, and sustainable materials, promoting efficiency and reducing waste in various contexts while addressing climate change challenges. More production techniques and application in iron and steel industries. Bioresources and Bioprocessing. https://doi.org/10.1186/s40643-024-00779-z

The iron and steel industries (ISI) are significant energy consumers and contributors to global CO2 emissions. Traditional steel-making processes rely heavily on fossil fuels like coal and coke, which are responsible for about 60-70% of the CO2 emissions in steel production. With the depletion of fossil fuel resources, there is a growing need for sustainable and environmentally friendly alternatives. One promising solution is biochar, a porous black solid derived from the thermochemical transformation of biomassBiomass is a complex biological organic or non-organic solid product derived from living or recently living organism and available naturally. Various types of wastes such as animal manure, waste paper, sludge and many industrial wastes are also treated as biomass because like natural biomass these More.

Biochar has several advantages over coal and coke, including a higher heating value, greater porosityPorosity of biochar is a key factor in its effectiveness as a soil amendment and its ability to retain water and nutrients. Biochar’s porosity is influenced by feedstock type and pyrolysis temperature, and it plays a crucial role in microbial activity and overall soil health. Biochar More, and a significantly larger surface area. These properties make biochar an attractive alternative for various applications within the ISI. However, integrating biochar into these industries faces challenges such as higher costs, inconsistent quality, and the need for process modifications.

There are several methods for producing biochar, including slow pyrolysisPyrolysis is a thermochemical process that converts waste biomass into bio-char, bio-oil, and pyro-gas. It offers significant advantages in waste valorization, turning low-value materials into economically valuable resources. Its versatility allows for tailored products based on operational conditions, presenting itself as a cost-effective and efficient More and hydrothermal carbonization, which yield higher amounts of biochar compared to other methods like fast pyrolysis and gasificationGasification is a high-temperature, thermochemical process that converts carbon-based materials into a gaseous fuel called syngas and solid by-products. It takes place in an oxygen-deficient environment at temperatures typically above 750°C. Unlike combustion, which fully burns material to produce heat and carbon dioxide (CO2​), gasification More. Biochar can be used as a reducing agent in steel-making processes, potentially lowering CO2 emissions. It can also generate heat and energy due to its high calorific value and aid in carbon sequestration efforts.

Despite its potential, biochar’s higher costs compared to traditional fossil fuels pose economic challenges. The sustainability and economic viability of biochar depend on factors like location, feedstockFeedstock refers to the raw organic material used to produce biochar. This can include a wide range of materials, such as wood chips, agricultural residues, and animal manure. More type, production scale, and pricing. Additionally, ensuring a reliable and consistent supply of biomass feedstock is crucial for large-scale biochar production.

Innovations in biochar production and integration into the ISI are essential for promoting sustainable industrial practices. By overcoming the challenges and leveraging the benefits of biochar, the iron and steel industries can contribute to a more environmentally conscious future.