How to use biochar extruder to make sawdust charcoal briquette


Biochar extruders are versatile machines used to convert biomass, such as sawdust, into charcoal briquettes. These briquettes are a sustainable alternative to traditional charcoal, offering benefits like reduced deforestation and improved soil health when used as biochar. This passage will guide you through the step-by-step process of using a biochar extruder to make sawdust charcoal briquettes.

sawdust charcoal briquette making line
sawdust charcoal briquette making line

Raw Material Preparation

Collecting and Drying Sawdust

The process begins with the collection of raw sawdust. It is crucial to use dry sawdust, as excess moisture can hinder the briquetting process and reduce the quality of the final product. Ideally, the moisture content should be less than 12%. Drying can be done using natural sunlight, or for larger operations, a rotary dryer or similar equipment.

Screening and Grinding

Once the sawdust is dry, it should be screened to remove any large particles or debris. This ensures a uniform feedstock, which is essential for consistent briquette quality. If the sawdust particles are too large, they should be ground down using a hammer mill or similar grinding equipment to achieve the desired particle size, usually less than 3mm in diameter.

Mixing and Binders

Adding Binders

While some extruders can compress sawdust without binders, adding a binding agent can help improve the durability and integrity of the briquettes. Common binders include starch, clay, or molasses. The binder is mixed with water and then combined with the sawdust until a consistent, dough-like mixture is achieved.

Mixing Thoroughly

Thorough mixing is crucial for ensuring that the binder is evenly distributed throughout the sawdust. This ensures that each briquette will have consistent properties. Mixing can be done manually or with a mechanical mixer for larger batches. The aim is to create a homogeneous mixture that will hold together well during extrusion.

Extrusion Process

Feeding the Mixture into the Extruder

The prepared mixture is then fed into the biochar extruder. The extruder consists of a screw or ram that compresses the mixture through a die to form cylindrical or other shaped briquettes. Consistent feeding is important to maintain a steady production rate and ensure uniform briquette quality.

Compressing and Shaping

As the mixture is fed into the extruder, it is compressed and shaped into briquettes. The pressure and temperature settings on the extruder can be adjusted to achieve the desired density and strength of the briquettes. Higher pressure typically results in denser, more durable briquettes.

Drying and Carbonization

Drying the Briquettes

Freshly extruded briquettes contain moisture and need to be dried to improve their combustion properties. Drying can be done using natural sunlight, or for faster results, a drying oven or rotary dryer can be used. Proper drying is essential to prevent mold growth and ensure the briquettes burn efficiently.

Carbonizing the Briquettes

To convert the dried briquettes into charcoal, they must undergo a carbonization process. This can be done using a charcoal kiln, retort, or other carbonization equipment. The process involves heating the briquettes in an oxygen-limited environment to a temperature of around 500-700°C. This removes volatile compounds and leaves behind pure carbon, resulting in charcoal briquettes.

Packaging and Storage

Packaging the Charcoal Briquettes

Once carbonized, the charcoal briquettes are cooled and ready for packaging. Proper packaging is essential to protect the briquettes from moisture and physical damage during storage and transportation. They can be packed in bags or boxes, depending on market requirements.

Storing the Briquettes

The packaged briquettes should be stored in a cool, dry place to maintain their quality. Proper storage conditions help prevent moisture absorption, which can affect the briquettes’ burning efficiency. Storing the briquettes correctly ensures they remain in optimal condition for end-users.


Using a biochar extruder to make sawdust charcoal briquettes is a multi-step process that involves raw material preparation, mixing, extrusion, drying, carbonization, and packaging. By carefully controlling each stage, high-quality briquettes can be produced that offer a sustainable alternative to traditional charcoal. These briquettes not only provide an efficient fuel source but also contribute to environmental conservation and waste reduction. Visiting:

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