Pulverized material refers to substances that have been reduced to fine particles or powder through mechanical processes such as crushing, grinding, or impacting. This process is crucial in various industries for preparing materials for further processing or use.
Explanation:
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Mechanical Processes: Pulverization typically involves machines like pulverizers, which use different mechanisms to break down materials. For instance, ball mills use steel balls or rods that smash into the material as the cylinder rotates, while hammermills use rapidly revolving hammers encased in steel to crush the material. These processes rely on the application of force through pressure, collision, or friction.
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Application in Industries: Pulverization is essential in numerous industries including construction, agriculture, pharmaceuticals, and recycling. For example, in pharmaceuticals, pulverization is used to create fine powders like creatine for medicine. In construction, it helps in breaking down building materials, and in recycling, it aids in tire-shredding and vehicle crushing for scrap.
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Material Characteristics: The effectiveness of pulverization depends on the material's properties. Materials should ideally be brittle with a compressive strength not exceeding 60MPa and a hardness grade of 3. If the moisture content exceeds 6%, the particles may stick together, affecting the pulverization process.
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Specialized Techniques: For materials that are soft or malleable, specialized techniques like cutting or knife milling might be necessary to achieve a fine-grained condition. Additionally, the Cryogenic Grinder system uses liquid nitrogen to cool materials before pulverization, which helps in achieving ultra-low temperature pulverization and enhances the material's properties like explosion-proof and anti-oxidation.
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Environmental and Operational Considerations: Pulverizers are designed to be environmentally friendly and efficient. They often come equipped with dust-proof devices to prevent pollution and are made from high-quality materials to ensure durability. The Cryogenic Grinding Mill system, for example, forms a closed-circuit circulation system that optimizes energy use and reduces consumption.
In summary, pulverized material is the result of a controlled mechanical process that breaks down substances into fine particles, facilitating their use in various industrial applications. The process involves careful selection of machinery and techniques based on the material's properties and the desired outcome.
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