Types of Spiral Classifier in Mineral Processing

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In the mineral processing industry, the effective classification of ores is essential for optimizing separation processes. As observed in recent industry updates, Spiral Classifiers continue to gain recognition for their pivotal role in enhancing efficiency in mineral processing plants.

During mineral processing, ores must be ground to a specific size to ensure the separation of fine-grained minerals from gangue. Over-grinding can lead to sliming effects, necessitating a balanced approach to classification. The criteria for qualified products demand timely separation to avoid unnecessary grinding, reinforcing the significance of classification both technologically and economically.

Currently, the two main types of classifiers utilized in mineral processing are mechanical classifiers and hydrocyclones. Mechanical classifiers include the spiral classifier, rake classifier, and tank classifier, among others. As mineral processing techniques evolve, spiral classifiers have largely supplanted rake classifiers due to their simpler structure and superior classification capability. In addition, hydrocyclones have gained popularity over tank classifiers due to their efficiency and space-saving design. Nevertheless, the resurgence of spiral classifiers is noteworthy, as they present several distinctive advantages:

1. They facilitate automatic sand return to the ball mill, eliminating the need for additional feeders and reducing overall equipment and construction costs.

2. Their reliable sand return ensures consistent concentration, enhancing the grinding process's effectiveness.

3. Particle size grading can be adjusted based on the feed rate and overflow concentration.

4. They exhibit a simple design, making them straightforward to operate with minimal maintenance costs.

So, what are the common types of spiral classifiers? How can we distinguish and select the appropriate spiral classifier?

• 01

  According to the height of overflow dam

• 02

  According to the number of screw shifts

• 03

  Xinhai Mining Spiral Classifier Applications

01

According to the height of overflow dam

Based on the height of the overflow dam, spiral classifiers can be categorized into the conventional spiral classifier, low dam spiral classifier, and submerged spiral classifier.

1. Spiral classifier

In a spiral classifier, the overflow dam is situated higher than the bearing center at the spiral shaft's lower end. The dam height is adjustable within a specific range, allowing the settling area to vary according to grading requirements.

Link to Zoneding machine

2. Low dam spiral classifier

A low dam spiral classifier has an overflow dam that is lower than the bearing center at the overflow end. Consequently, it has a smaller settling area and lower overflow capacity, leading to excessive screw agitation on the pulp surface. Its primary application is to wash sand and coarser particles with minimal mud content.

3. Submerged spiral classifier

The submerged spiral classifier features several spiral blades submerged beneath the liquid level in the settling area, providing a larger settling area and deeper grading pool. This design enhances its ability to separate finer particles.

02

According to the number of screw shifts

Spiral classifiers can also be categorized based on the number of screw shifts, leading to single-screw and double-screw classifiers. While both have comparable grading performance, double-screw classifiers can handle a greater volume of return sand and overflow. However, they come with a higher cost, making single-screw classifiers often more suitable for regular operations.

Experts recommend selecting the type of classifier based on processing capacity and operational parameters to ensure optimal productivity.

03

Xinhai Mining Spiral Classifier Applications

1. Vietnam 800tpd graphite processing project

2. Morocco 500tpd silver processing project

3. Russia 500tpd gold processing project

4. Hebei 400tpd feldspar processing project

5. Sudan 240tpd gold processing project