Charcoal

Charcoal is a lightweight black material made from heating wood or other plant and animal materials with very little oxygen. This process, called pyrolysis, removes all the water and other parts that can burn away, leaving behind mostly carbon. In the past, people made charcoal by building a pile of wood in a cone shape and slowly burning it. Special workers called charcoal burners had to watch these piles very carefully, often living alone to do their job.

Historically, making charcoal has been very important, but it also caused problems because it used up a lot of trees. In places like Central Europe, cutting down so many trees for charcoal led to deforestation. To solve this, people used methods like coppicing, where they cut back trees to let them grow again, to keep a supply of wood. As wood became harder to find, people started using coal instead.

Today, charcoal is made in special closed spaces called retorts, which makes the process more efficient. Charcoal is used in many ways, such as helping to make iron and steel, providing fuel for cooking and heating, and even in cosmetics and medicine like activated charcoal. However, making charcoal can hurt the environment by cutting down forests and releasing smoke into the air. In some parts of the world, like South America and Africa, people make charcoal in ways that are not allowed, which causes big problems for nature and wildlife.

History

Further information: Fusain and Fossil record of fire

Charcoal pile

Making charcoal from wood is very old. People would stack pieces of wood in a cone shape, leaving spaces at the bottom for air to enter. A tube in the middle let out the smoke. They would cover the whole pile with dirt or wet clay. The fire would start at the bottom and slowly move up through the wood.

In Britain, people made big piles of logs leaning against a small chimney made of wooden sticks. They covered everything with soil and straw and lit the fire through the chimney. The logs would slowly turn into charcoal over about five days. If the soil cracked open from the heat, more soil was added to keep it sealed.

Charcoal burners

Making charcoal needed careful control of the fire. Only skilled workers, called colliers, were trusted with this job. They often lived alone in small huts to watch over their wood piles. In the Harz Mountains of Germany, these workers lived in special cone-shaped huts called Köten, which still exist today.

Low efficiency and harmful emissions

The way charcoal was made was not very efficient and produced a lot of smoke that was bad for health and the environment. Usually, wood would turn into about 60% charcoal by space, or 25% by weight, but small-scale methods were often less efficient. Larger operations in later times could make up to 90% charcoal.

Peak of production and decline

Deforestation and scarcity

Making huge amounts of charcoal caused many forests to disappear, especially in Central Europe. As wood became harder to find, people started using coal instead.

By-product of wood tar production

In Finland and Scandinavia, charcoal was a side product when making wood tar from pine trees. This charcoal was used in furnaces for melting metals. When tar production stopped in the late 1800s, forests began to grow back.

Charcoal briquette

In America, a man named Ellsworth B. A. Zwoyer invented a way to make charcoal bricks in 1897. Later, Henry Ford helped popularize this by using wood waste from his car factories. His company became known as the Kingsford Company.

Production methods

People make charcoal by heating wood in a place with very little oxygen. This process removes all the water and other parts from the wood, leaving behind a black, lightweight material called charcoal.

Today, many people use special containers called retorts to make charcoal. This method helps save energy because it uses the gases produced during heating. The temperature at which wood is heated changes the type of charcoal made. At lower temperatures, the charcoal is soft and easy to break apart. At higher temperatures, it becomes hard and strong.

Types

• Common charcoal is made from materials like peat, coal, wood, coconut shell, or petroleum.
• Sugar charcoal comes from heating sugar until it turns to carbon. It was used by Henri Moissan in early efforts to create synthetic diamonds.
• Activated charcoal is a special kind of charcoal made for medical use. It has many tiny spaces that help it trap harmful chemicals.
• Lump charcoal is made directly from hardwood and usually creates less ash than other types.
• Japanese charcoal is made without a strong smell or smoke when burned. It includes types like White charcoal (Binchōtan).
• Pillow shaped briquettes are made by pressing charcoal with binders and other materials to help them burn evenly.
• Sawdust briquette charcoal is made by pressing sawdust together. It is popular in places like Taiwan, Korea, Greece, and the Middle East for barbecues because it burns long and clean.
• Extruded charcoal is created by shaping wood into logs using heat and pressure, sometimes before and sometimes after heating the wood to carbon.

Uses

Charcoal has been used since ancient times for many purposes, such as art and medicine. Its most important use is as a fuel for metalworking. Charcoal burns very hot, making it perfect for forges and creating steel. It was also used to make black pigment by grinding it up.

Charcoal can also be used for cooking and heating because it burns with less smoke than regular wood. In some places, like Haiti, most fuel comes from charcoal. It can be placed in special grills or containers to cook food. Starting a charcoal fire can be tricky, so people sometimes use special liquids or tools to help it catch fire.

Charcoal is also useful in cleaning and filtering things. When treated in a certain way, it becomes very good at trapping impurities and smells, which is why it’s used in air purifiers and water filters. It’s even used in some medicines to help with stomach problems. Artists use charcoal for drawing because it makes dark, smooth lines. It can also help improve soil in gardens.

Environmental impact

Making and using charcoal can hurt the environment. When we burn wood for charcoal, it can lead to cutting down too many trees, which is called deforestation.

In places like South America, using charcoal to make metal has caused big problems for people, animals, and health. In Brazil, many people make charcoal without permission, which harms the forests. In Virunga National Park in the Democratic Republic of Congo, cutting down trees for charcoal threatens the mountain gorillas. Similar issues happen in Zambia and Malawi, where many people rely on charcoal for heat and cooking. Some experts believe that if we managed forests better and planted new trees, charcoal could provide clean energy for people.

When charcoal is brought to Europe, much of it comes from tropical woods whose origin is often unknown. For example, in Germany, many charcoal products contain wood from warm, tropical areas. However, charcoal from Namibia is made from extra plants that grow too thick, helping the environment. In Somalia, trading charcoal causes problems for the region’s safety and nature.

In popular culture

Charcoal appears in many stories and films. In the movie Le Quattro Volte from 2010, there is a beautiful scene showing the old way people made charcoal. The book series by Arthur Ransome, Swallows and Amazons, especially the book Swallowdale, shows life and work of charcoal makers in the early 1900s in the Lake District in the UK. The opera King and Charcoal Burner by Antonín Dvořák tells a story from a Czech legend where a king finds help from a charcoal maker in a forest. The video game Kingdom Come: Deliverance shows many details of charcoal making in the 15th century in Bohemia.