Application of charcoal in metallurgical industry.

Intro

Metallurgy is one of the most energy-intensive and carbon-emitting industries in the world. Taking into account global efforts to combat climate change, we are considering and implementing technological solutions aimed at reducing the carbon footprint in metal production. 

Characteristics of charcoal

Charcoal (biochar) is a carbon-containing material obtained through thermal processing of wood, as a result o via pyrolysis — under conditions of limited or complete absence of oxygen.

Charcoal surpasses fossil-based alternatives in a number of its characteristics, making its application in metallurgy particularly compelling due to:

• High carbon content:
  Charcoal contains over 82–90% of non-volatile carbon, making it an efficient reducing agent for metallurgical processes. 
• Low volatile matter content:
  The content of volatile components in charcoal typically ranges from 10–15%, reducing the likelihood of side reactions and formation of pollutants.
• Low ash content:
  The ash content of charcoal usually does not exceed 2%. This minimizes the risk of contaminating metal with impurities and improves the quality of the final product. 
• Minimal sulfur and phosphorus content:
  Charcoal contains minimal amounts of sulfur (<0.05%) and phosphorus, which prevents the contamination of metals with these elements.

• High mechanical strength:
  Charcoal is resistant to breakdown under pressure and high temperatures, which is essential for its use in blast furnaces and other high-temperature processes. 
• Calorific value:
  Charcoal has a calorific value ranging from 27–30 MJ/kg, making it an efficient fuel for metallurgy.
• Renewability of the resource:
  Unlike fossil coal, charcoal is produced from biomass, making it an environmentally sustainable choice.
• Low carbon footprint:
  Less carbon dioxide is emitted during charcoal production and use, contributing to the reduction of the carbon footprint in metallurgical processes.

Technological Solutions for Reducing the Carbon Footprint in Metallurgy

Metallurgy is one of the most energy-intensive industries, contributing significantly to annual carbon dioxide emissions into the atmosphere. Considering global efforts to combat climate change, it is important to implement technological solutions aimed at reducing the carbon footprint in metal production. Below we describe key approaches and innovations that could significantly impact the situation: 

1. Use of Renewable Energy Sources

One of the main ways to reduce the carbon footprint is transitioning to renewable energy sources. Solar and wind power plants can provide metallurgical enterprises with “clean” energy, reducing dependence on fossil fuels.

2. Implementation of hydrogen technologies

Hydrogen is emerging as a promising material for reducing carbon emissions. The use of “green” hydrogen, produced by water electrolysis with the use of renewable energy sources, can replace coke in iron production processes, significantly reducing carbon emissions. 

3. Improvement of recirculation processes

Methods of material recirculation, such as reuse of slag and waste, can significantly reduce the need for primary raw materials and, consequently, decrease carbon impact. This can also reduce recycling costs and improve the economic efficiency of enterprises.

4. Energy-efficient technologies

Implementation of new, more efficient production technologies, such as electric arc furnaces and direct reduction technologies, will reduce energy consumption and lower carbon emissions. These methods are significantly more efficient than traditional high-temperature furnaces.

5. Carbon capture and disposal

Carbon capture and storage (CCS) technologies allow capturing CO2, generated during production and storing it safely in underground geological formations. This field is still in the development stage but shows great potential for metallurgical industry. 

6. Innovations in the field of materials

Development of new alloys and materials that require less energy for their production can significantly reduce the carbon footprint. For example, the use of carbon-based composite materials can replace traditional metallurgical processes. 

However, one of the most accessible and environmentally sustainable solutions is the use of charcoal (biochar). Due to its unique properties, charcoal is becoming a promising solution for creating low-carbon metallurgical processes. 

Use of charcoal in blast furnace production

Charcoal is one of the oldest materials used in metallurgy, but its application in blast furnace production remains relevant even in the modern world. With the development of technologies and increasing focus on environmentally clean processes (especially reducing the carbon footprint), its use is becoming more widespread, opening new horizons for metallurgical industry. 

Charcoal is currently used in blast furnace production as a reducing agent for such ingredients as iron oxides. Its application helps reduce carbon dioxide emissions if compared to coal, which is often used as a traditional reducing agent. At the same time, it improves the quality of the final product, enhancing its properties and reducing the content of undesirable impurities. 

Charcoal can also be used as a substitute for metallurgical coke, as well as injected as pulverized coal fuel (PCF) and replace fossil coal or natural gas. 

Replacing coke with charcoal is a very important function, as coke is one of the most expensive components in hot metal production and one of the main sources of carbon dioxide emissions.

The main advantages of using pulverized coal fuel (PCF) can be found in our article “What is Pulverized Coal Injection? Why Do You Need It?“

However, when using charcoal as a pulverized coal fuel (PCF), you have the following additional advantages:
Environmental friendliness: The use of charcoal helps reduce environmental impact, as it is a more sustainable and recyclable source of carbon.
Product quality: Adding charcoal to blast furnace production improves the quality of hot metal:

Energy efficiency: Charcoal has a high calorific value, which helps reduce the amount of used raw materials and optimize the smelting process.

Reduction of carbon footprint and the possibility of obtaining carbon credits.

M HEAVY TECHNOLOGY experts develop technologies for most efficient use of charcoal in your production, which subsequently helps:

✔️ decrease production costs, 

✔️ increase productivity, 

✔️ minimize the environmental impact of production, 

✔️ reduce the carbon footprint and assist in obtaining carbon credits. 

Additionally, our company will help you organize production of charcoal, starting from creating the project up to the supply of modern equipment for your specific production. 

Conclusion 

Charcoal is a promising material for use in metallurgy, contributing to the improvement of the environmental situation and product quality. With the development of technologies and the increasing focus on environmentally clean processes it may become more widespread, opening new horizons for metallurgical industry.