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Spiral ClassifierSpiral Classifier

Spiral Classifier

Applied Materials: Iron ore, ilmenite, chromite, pyrite, zircon, rutile, monazite, tungsten, tin, tantalum, niobium, copper, zinc, lead, gold, etc.
  • Power:1.1-40KW
  • Capacity:770-2800T/D

Basic Information of Spiral Classifier

The spiral classifier, also known as the classifier or horizontal spiral classifier, is a type of equipment used in ore processing plants. It is used for mechanical classification based on the principle that solid particles have different specific gravities and therefore precipitate at different rates in a liquid. The spiral classifier is particularly effective for treating alluvial placer deposits, especially those with high dissociation degrees and flat-shaped mineral particles. It is commonly used in conjunction with ball mills for mineral processing. The classifier is characterized by its simple structure, reliable operation, ease of use, high efficiency, and energy-saving capabilities.

The spiral classifier offers several advantages:

  • Large processing capacity: It can handle a significant amount of ore, making it suitable for high-volume processing.
  • Simple structure and low total cost: The spiral classifier has a straightforward design and is cost-effective to operate and maintain.
  • Reliable work and convenient operation: The classifier operates reliably, and its operation and maintenance are convenient.
  • Good classification and washing effect: The spiral classifier effectively separates and cleans the ore, ensuring a high-quality end product.
  • Low abrasion resistance and loss: The spiral shaft of the classifier has low wear and tear, resulting in minimal material loss.
  • Fine granularity and low anti-sand rate: The classifier produces fine-grained materials and has a low rate of sand contamination.
  • Integrated functionality: The equipment combines ore washing, dewatering, desilting, and particle size control, resulting in higher classification efficiency and easier operation.

 The working principle of a spiral classifier is based on the difference in the size and specific gravity of solid particles.

Here is a step-by-step explanation:

  1. The mixture of ore particles and water is fed into the classifier tank from the bottom.
  2. As the spiral rotates, the fine ore particles with lower specific gravity float in the water and overflow through the overflow weir at the top of the tank.
  3. Meanwhile, the coarse ore particles with higher specific gravity sink to the bottom and are conveyed upward by the spiral to be discharged through the discharge valve.
  4. The fine material that overflows from the classifier is directed to further processing, usually passing through a mill for grinding.
  5. The coarse material discharged from the bottom is often referred to as “underflow” and can be directed to subsequent stages of processing or disposed of.

By this process, the spiral classifier separates and classifies the ore particles based on their size and specific gravity, ensuring that the finer particles are properly processed while removing the coarser particles.

Spiral Classifier Working Principle.gif

The structure of a spiral classifier typically consists of the following components:

  1. Base: The base is made of channel steel and provides stability for the classifier.
  2. Body: The body is welded with steel plates and forms the main structure of the classifier.
  3. Screw Shaft: The screw shaft is a central component of the classifier. It is responsible for the transportation of ore particles and is equipped with a water inlet head, a shaft head, and a wear-resistant pig iron sleeve.
  4. Lifting Device: The lifting device is used to adjust the height of the spiral classifier. It can be either electric or manual, allowing for easy operation.
  5. Transmission Device: The transmission device provides power to the screw shaft, enabling its rotation. It is typically driven by an electric motor or a hydraulic motor.
  6. Spiral Groove: The spiral groove is formed by the spiral blade attached to the screw shaft. It allows the ore particles to be transported upward while separating and classifying them based on their size and specific gravity.
  7. Lower Support (Bearing Bush): The lower support serves as a bearing for the screw shaft, ensuring smooth rotation and stability.
  8. Discharge Valve: The discharge valve is used to control the flow of the coarse material that sinks to the bottom of the classifier. It allows for the discharge of the underflow or directs it to subsequent processing stages.
Spiral Classifier


To ensure the efficient and continuous operation of a spiral classifier, it is important to conduct regular inspections and maintenance work.Here are a few key points listed by Zoneding Machine, a spiral classifier manufacturer, for users to consider:

  • Lubrication System: Pay attention to the lubrication of the spiral classifier. Check and add lubricating oil regularly to ensure that the various parts of the equipment are well-lubricated. This helps to reduce friction, improve efficiency, and prolong the service life of the equipment.
  • Body Parts: Regularly inspect the various parts of the spiral classifier’s body. Check for any signs of wear, damage, or loose connections. This includes examining the base, body structure, screw shaft, spiral groove, and discharge valve. Address any issues promptly to prevent further damage and ensure proper functioning.
  • Electrical Device: Inspect the electrical devices of the spiral classifier, such as the motor, control panel, and wiring. Check for any loose connections, signs of overheating, or abnormal sounds. Ensure that the electrical components are functioning properly and address any electrical issues accordingly.
  • By paying attention to these key areas, users can help maintain the performance and reliability of the spiral classifier, allowing for efficient and continuous operation.

Zoneding Machine produces high-quality horizontal spiral classifiers that come in a wide range of specifications and models, catering to the production needs of large, medium, and small enterprises. These spiral classifiers are not only guaranteed in terms of quality but also offered at an affordable price. By using Zoneding Machine spiral classifiers, enterprises can effectively reduce their investment costs and increase their income. This enables customers to recover their investment costs more quickly, making the equipment a valuable investment for their operations.

China Screw Classifier Manufacturing Plant

Zoneding Machine, a reputable spiral classifier manufacturer based in China, offers a wide range of models at reasonable prices. They provide considerate customer service and have a comprehensive selection, including sand classifiers and spiral classifiers for gold, copper, zinc, lead, and more. If you are interested in obtaining the latest quotation or have any inquiries, you can chat with their representatives online, leave a message below, or send them an email. Thank you for considering Zoneding Machine for your spiral classifier needs.

General Specification


Please note that the information provided is subject to change due to advancements in technology. Zoneding Machine reserves the right to make modifications without prior notice. The performance of their machines may vary depending on the specific application. For more detailed information, it is recommended to chat online with Zoneding engineers. They will be able to provide you with the most up-to-date and accurate information based on your specific requirements and needs.

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