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walnut shell activated carbon preparation

Walnut shells are the tough outer shell of walnut fruit and are often considered waste products. However, with proper handling and processing, walnut shells can be processed into walnut shell charcoal, which is a type of fruit shell charcoal that has many uses. Walnut shell activated carbon is a new type of activated carbon material produced by using wild walnut shells or collected and cultivated walnut shells as raw materials, through a series of activated carbon production processes such as selection, carbonization, burning, and then screening. Based on these rules, our company has particularly developed an activated carbon plant, which can further convert production capacity and establish green and environmentally friendly factories.

The Benefits and Features of Walnut Shells In Making Activated Carbon

  1. Activated carbon made from walnut shells is multi-faceted and microporous, with strong dirt-carrying capacity and a high oil and suspended matter removal rate. This improves the factor’s cleaning ability during production.
  2. It has multiple edges and different particle sizes, forming deep bed filtration, which enhances oil removal capacity and filtration speed. This increases the efficiency of factories in producing clean energy.
  3. It is hydrophilic but not lipophilic and has a suitable specific gravity, easy backwashing, and strong regeneration ability.
  4. It has high hardness and is not easy to corrode after special treatment. There is no need to replace the filter material.  Only 10% is replenished every year, which saves maintenance costs and time and improves utilization.

solution for activated carbon preparation

In this setting, the use of walnut shells to manufacture activated carbon can be recognized as an advanced natural source. Therefore, our company has dedicated for years and designed the professional activated carbon equipment for production such as biomass carbonization and activation plant. Walnut shell was used as the carbonaceous source material to prepare of activated carbon, there are general steps during the whole production.

crushing and screening equipment

1. Preparation of Materials

In the preliminary preparation work, a large number of walnut shells should be collected. These walnut shells need to be washed, dried and then broken into pieces. This step is mainly to remove impurities and residues to ensure the smooth progress of the next stage.

2. Carbonization

The carbonization stage is one of the major steps in the production of walnut shell activated carbon. At this stage, the shell undergoes high-temperature carbonization, and the organic matter in it gradually decomposes into carbon element. During this process, our company has specific machine for higher efficiency: carbonization furnace and continuous carbonization kiln.

carbonization furnace
Activation kiln

3. Activation

The activation stage is another key step in the production of activated carbon. At this stage, the carbonized fruit shell is further activated to improve its adsorption properties. Steam activation is the reaction of carbonized fruit shells with water vapor at high temperatures to form more microporous structures on the surface. Carbon dioxide activation involves treating carbonized fruit shells at high temperatures in a carbon dioxide atmosphere to make the surface rougher, thus enhancing the adsorption capacity. In this setting, professional equipment for example activation kiln plays a significant role.

4. Washing

After activation, some ash and impurities will remain on the surface of walnut shell activated carbon, which needs to be rinsed. The rinsing process generally uses acid-base solution or pure water to remove impurities and ash on the surface of activated carbon.

pickling equipment
rotary dryer for activated carbon

5. Drying

The rinsed nut shell activated carbon needs to be dried to remove the moisture inside and improve its adsorption performance. The drying process is generally carried out using high-temperature hot air drying equipment to accelerate water evaporation and remove internal moisture.

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