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What is a spiral classifier？

The spiral classifier is a device that utilizes the principle of different sedimentation speeds of solid particles in a liquid based on their specific gravity for mechanical classification. It is widely used in closed-circuit processes in conjunction with ball mills to separate and classify ore sand in mining plants. It can also be applied in gravity separation plants for classifying ore sand and fine mud, as well as in metal ore dressing processes for size classification of ore pulp. Additionally, it finds application in de-sliming and dewatering operations during ore washing.

• What is a spiral classifier？
• Why Use a Spiral Classifier in Mineral Processing?
• What are the Different Types of Spiral Classifiers?
• What are Applications of the Spiral Classifier?
• Advantages Of Spiral Classifier
• What is the Work Principle of Spiral Classifier?
• How Does a Spiral Classifier Work?
• What Materials Can Be Separated Using a Spiral Classifier?
• What are the Structure of a Spiral Classifier?
• General Specification
• FAQ
• Related Products

Why Use a Spiral Classifier in Mineral Processing?

Spiral classifiers offer several key advantages in mineral processing, making them a popular choice for efficient material separation. These benefits lead to higher product quality and lower operational costs.

You should consider using a spiral classifier for the following reasons:

• Simple Design: Their straightforward construction makes them easy to operate and maintain, reducing the need for specialized training.
• High Reliability: Built with robust materials, they perform consistently even in harsh mineral processing environments.
• Cost-Effectiveness: Compared to alternatives like a hydrocyclone, spiral classifiers have a lower initial investment and cheaper ongoing operational costs.
• Handles High Solids: They are excellent at managing slurries with high concentrations of solids, making them perfect for pre-treatment stages.

What are the Different Types of Spiral Classifiers?

Types: There are four classifiers: high weir single spiral and double spiral, submerged single spiral and double spiral.

• High weir spiral classifier is suitable for coarse particle classification, the maximum size of overflow is generally 0.4~0.15mm;
• Submerged spiral classifier is suitable for fine particle classification, the maximum size of overflow is generally below 0.2mm.

What are Applications of the Spiral Classifier?

Spiral classifiers are versatile and used across many industries for separating solids from liquids. Their flexibility makes them essential for a variety of processes.

• Mining Plants: Used in conjunction with ball mills to form a closed-circuit for ore sand separation and classification.
• Gravity Separation: Applied for classifying ore sand and fine mud to enhance mining efficiency.
• Metal Ore Dressing: Used in the ore dressing process for size classification of ore pulp to meet subsequent process requirements.
• Mineral Processing: They are used to separate valuable minerals from waste rock, which improves the concentration of the desired elements for further processing.
• Aggregate Washing: They effectively remove unwanted clay, silt, and organic materials from sand and gravel, resulting in a cleaner, higher-quality final product for construction.
• Desanding Process Water: In operations like frac sand plants, they protect pumps and other equipment from wear by removing abrasive sand particles from the water.
• Wastewater Treatment: They help in separating solid waste from water, which is a critical step in many treatment facilities.
• Ore Washing Operations: Involved in de-sliming and dewatering processes during ore cleaning.

Advantages Of Spiral Classifier

• The energy consumption of spiral classifier is 50% lower than other classification equipment, and the output is also increased by 50%.
• The water tank has a large slope, which is convenient for forming a closed-circuit ring grinding operation with the ball mill, and forms a self-flow sand return.
• Simple operating process and stable working status, greatly reducing maintenance costs.
• Its spiral structure can ensure a large enough settling area to extend the material suspension time, which is more conducive to the even distribution of materials during the classification process.
• Users can adjust the parameters of the spiral classifier according to their needs, such as spiral speed, inclination and outlet size to achieve different classification requirements.

What is the Work Principle of Spiral Classifier?

The work principle of a spiral classifier relies on the difference in settling velocities of particles in a liquid medium. Larger, denser particles settle faster and are conveyed to the bottom, while finer particles remain suspended and overflow with the liquid. It is based on the different sedimentation speeds of solid particles in a liquid due to their varying specific gravities. When the ore pulp enters the tank from the side feed inlet, it forms a sedimentation zone at the bottom of the tank. The slowly rotating spiral provides a certain degree of agitation to the pulp. After agitation, the light and fine particles suspend on the surface, forming an overflow that flows over the weir at the end of the water tank into the next mineral processing step. The heavy and coarse particles settle at the bottom of the tank, forming a return sand that is transported by the spiral to the discharge port for removal, thus achieving the desired classification.

How Does a Spiral Classifier Work?

A spiral classifier works through sedimentation and settling velocity. Heavier particles settle faster due to gravity, while lighter particles remain suspended. The spiral then conveys the settled particles upwards, achieving separation.

The process begins with the slurry entering the tank. The larger, heavier particles quickly settle to the bottom due to their higher settling velocity. The rotating spiral flights then mechanically lift these settled particles up the inclined base of the tank. As the spiral moves the solids upwards, excess liquid drains back into the pool. The lighter, finer particles remain suspended in the liquid and are carried out of the tank as overflow. The single most impactful adjustment is the pool depth; too deep, and you lose fines, too shallow and you contaminate the overflow.

What Materials Can Be Separated Using a Spiral Classifier?

Spiral classifiers are highly versatile and can separate a wide range of materials based on size and density. This makes them useful in many different industries.

Common materials include:

• Sand and Gravel: The sand classifier equipment is perfect for washing aggregates. It removes unwanted fine particles, clay, and silt, producing a clean product for construction.
• Ores: In mineral processing, these classifiers separate valuable mineral ores from waste rock. This increases the concentration of metals like gold, copper, and iron before they go to the next stage of refining.
• Other Industrial Minerals: They are also used to process materials like coal, phosphate, and kaolin clay.

What are the Structure of a Spiral Classifier?

The spiral classifier mainly consists of the following components:

• Transmission Device: Includes an electric motor, reducer, cylindrical gear pair, and bevel gear, responsible for driving the rotation of the spiral.
• Spiral Body: Composed of a hollow shaft, supports, spiral blades, and lining iron, which is the main working part of the classifier.
• Tank: Holds the entire slurry and bears the weight of the machine and all its loads. Constructed by welding steel plates and various steel sections.
• Lifting Mechanism: Used to raise or lower the spiral for maintenance or to adjust the processing level within the tank.
• Lower Bearing (Bushing): Supports the spiral and bears the load during operation.
• Discharge Valve: Located at the bottom of the tank, allowing the slurry to be drained when necessary.

General Specification

Spiral Classifier

FAQ

1.Are you a manufacturing or trading company?

We are manufacturer. Our factory established in 2004.

2.What is the after-service of your company?

We can provide the foundation drawing, installation service, training, spare parts and other service according to the customer’s requirements.

3. Which mineral processing method should I choose?
According to the properties of minerals, we will choose the treatment method that most suitable for you.

4. What machines are usually required for the whole production line?
Usually there are feeder, primary and secondary crushers, vibrating screen, ball mill, classifier, spiral chute, magnetic or flotation machine, dryer, etc. Equipment can be adjusted.

5. What is the final mineral concentration?
It depends on the ore grade. The final concentration of gold ore can reach 80-90%., eaque ipsa quae ab illo inventore veritatis et quasi architecto beatae vitae dicta sunt explicabo. Nemo enim ipsam voluptatem quia voluptas sit aspernatur aut odit aut fugit.

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