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Recycling eggshells using an HGM ultrafine grinding mill is an efficient way to produce a fine eggshell powder with high purity and uniformity.
The HGM ultrafine grinding mill is specifically designed for grinding non-metallic minerals and can produce very fine powders with particle sizes down to a few microns.
HGM Ultrafine Grinding Mill For Eggshells Powder Making
Here’s a step-by-step guide to recycling eggshells using an CLIRIK Machinery’s HGM ultrafine grinding mill:
1. Collection and Cleaning
l Gather Eggshells: Collect eggshells from sources like food processing plants, bakeries, or households.
l Rinse and Clean: Thoroughly clean the eggshells by removing any remaining egg whites or yolks. Industrial processes may use automated washing systems.
l Sterilization: Sterilize the cleaned eggshells using boiling, steaming, or UV light to eliminate bacteria. This is crucial if the eggshell powder will be used in food or pharmaceutical products.
2. Drying
l Air Drying or Oven Drying: Completely dry the eggshells. In an industrial setting, conveyor belt dryers or rotary kilns are often used to achieve consistent drying at a large scale.
3. Pre-Grinding (Optional)
l Crushing: Depending on the initial size of the eggshells, they may need to be pre-crushed using a crusher or coarse grinder before feeding them into the HGM ultrafine grinding mill. This step helps to reduce the load on the mill and improve efficiency.
4. Grinding with HGM Ultrafine Grinding Mill
l Feeding: The dried and pre-crushed eggshells are fed into the HGM ultrafine grinding mill.
l Grinding Process:
n Main Unit: The HGM mill's main unit consists of a grinding roller, grinding ring, and a classifier. The eggshells are ground between the roller and the ring into fine powder.
n Multi-layer structure, repeated grinding: Adopting 3-layer or 4-layer grinding ring structure, the material is repeatedly ground into powder through the multi-layer mechanism.
n Classifier: The built-in classifier separates the fine powder from coarser particles. The coarse particles are sent back for regrinding, ensuring uniformity in the final product.
n Adjusting Fineness: The fineness of the powder can be adjusted by changing the speed of the classifier or altering the airflow. HGM mills can produce powders with particle sizes ranging from a few microns to sub-micron levels.
5. Collection and Sieving
l Powder Collection: The finely ground eggshell powder is collected in a cyclone collector or bag filter, depending on the mill setup.
l Sieving: If necessary, the powder is passed through a series of sieves to ensure uniform particle size distribution, especially if the powder is intended for specific applications like food supplements or bioceramics.
6. Packaging and Storage
l Packaging: The eggshell powder is then packaged into bags or containers based on the intended application. Industrial applications might require bulk packaging, while food-grade products may need airtight packaging to preserve quality.
l Storage: Store the packaged eggshell powder in a cool, dry place to prevent moisture absorption and maintain its quality.
7. Applications
l Soil Amendment: The ultrafine eggshell powder can be used as a calcium-rich soil amendment in agriculture.
l Food and Nutraceuticals: The fine eggshell powder can be added to food products or used in dietary supplements as a natural calcium source.
l Bioceramics and Industrial Uses: The high purity and fine particle size make this powder suitable for bioceramics, such as bone graft materials, and as an additive in plastics, paints, and concrete.
Advantages of Using HGM Ultrafine Grinding Mill for Eggshell Recycling
l High Efficiency: The HGM mill is capable of producing very fine powders with high efficiency, making it ideal for applications that require ultrafine particles.
l Consistent Quality: The built-in classifier ensures uniformity in particle size, which is critical for many industrial applications.
l Versatility: The adjustable fineness allows the production of eggshell powder tailored to specific needs, from agricultural uses to high-end bioceramic materials.
