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Producing rice husk charcoal is both a sustainable and profitable venture, given that rice hulls are plentiful and inexpensive raw materials. This guide provides a thorough overview of how to make rice husk charcoal, focusing on the two primary production methods: direct carbonization of rice husks into charcoal and carbonization followed by shaping into briquettes.

rice husk and charcoal production
rice husk and charcoal production

Understanding rice husk charcoal production

Rice husk charcoal is derived from the outer layer of the rice seed, known as the husk. This byproduct of rice milling is abundant in cellulose and lignin, which makes it perfect for charcoal production.

The method involves heating the rice husk to a temperature below its ignition point, leading to incomplete combustion and the formation of charcoal.

rice hull material
rice hull material

Direct carbonization of rice husk

Preparation and carbonization

  • Raw material preparation: gather and clean rice hull to eliminate any impurities. Make sure the husk is dry to improve the carbonization process.
  • Carbonization method: For small to medium-sized production, utilize a carbonization oven, either vertical or horizontal. For larger capacities, opt for continuous carbonization furnace equipment. (Related Post: 稻壳制炭连续式炭化炉>>)
  • Advantages: this approach provides benefits such as lower labor intensity, reduced carbonization time, smoke-free operation, and increased charcoal production compared to conventional charcoal kilns.

Post-processing

  • Forming: Once carbonized, rice husk charcoal typically exists in a powdered form. It is then formed into larger briquettes with the help of a charcoal forming machine, making it easier to handle and utilize.
  • Applications: Rice hull charcoal serves various purposes, including as a fuel source, insulation material, aid in steelmaking, fertilizer, and soil conditioner.

We have different types of molding machines that can produce charcoal briquettes in different shapes and sizes to meet various needs. (Read more: different types of charcoal briquette making machine>>)

rice hull coal
rice hull coal

Carbonization of rice husk briquettes

Briquette production

  • Briquette machine: a wood sawdust briquette machine is designed to compress rice hulls into briquettes without crushing them, thanks to the husk’s small size.
  • Shaping: this machine can create briquettes in different shapes, though they are usually formed as hexagonal or square prisms.
  • Advantages: briquettes are denser than 1, which results in higher charcoal yields and produces better quality finished charcoal with reduced ash content and moisture.

Carbonization process

  • Carbonization furnace: insert the rice husk briquettes into the carbonization furnace and adhere to the same carbonization procedure as with direct rice husk carbonization.
  • Quality assurance: make sure that no additives are included during production to preserve the purity and quality of the final charcoal.
rice husk charcoal briquettes
rice husk charcoal briquettes

Comparing the two production processes

Direct carbonization followed by molding can create various shapes of charcoal briquettes to satisfy different requirements. However, the lower capacity of rice husk results in a smaller filling weight per charring furnace and a reduced output.

Charcoal briquettes that are formed first and then carbonized exhibit higher density, lower ash and moisture content, and yield more charcoal of superior quality. Nonetheless, the finished product is restricted in shape, limited to hexagonal or quadrangular forms.

Choosing the right production process

The decision regarding which production process to use is influenced by various factors, including the scale of production, the desired quality of charcoal, and the market demand for specific shapes. Both methods provide effective ways to transform rice hull into valuable charcoal.

Please feel free to contact us as we assist you in creating a valuable product with multiple uses!