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Sep 30, 2021

Everything you need to know about screening

This article will explain the essentials for efficient screening.
Metso NW Rapid

The screening process serves to separate particles of different sizes and is ideal to ensure that the product reaches the market in the right size, shape and quality.

In aggregate production, the screening process is a key part of the production process and is carried out on a large scale. Therefore, it is necessary to make sure that the screening is done in the right way, ensuring greater productivity and efficiency. Metso Outotec has created a quick guide so that you would know the subject better and know how to perform the screening correctly. Check out our step by step guide.

First of all, remember:

  • Crushed materials are often angular and require different screening

  • The presence of fines can increase the feed speed of industrial screening

  • Moisture forces the particles to stick together, which limits the efficiency of the process

  • The difference in size between particles is a key factor

Screening systems: types of screening

There are two basic types of vibrating screens: vertical, which move particles up and down on the surface, and horizontal, which move particles backwards and forwards on the screen surface. Precisely because of this difference, on vertical screens particles do not collide with the sides of the material, which is something to be considered depending on the type of rock or grain screened.

Vibration can happen in many ways, including a circular motion, which is the most common. In this case, the equipment constantly vibrates and the material moves forward due to the inclination of the screen. The level of inclination influences how the material moves on the screen, and its distribution on the screen.

How do you measure the performance of a screen?

It all depends on the processing capacity of the screen and its efficiency. Good performance of screens is largely linked to a constant feed rate.

The feed can be concentrated in a part of the screen, with distribution to the rest of the screen to occur due to the vibrations and slope of the screen. It is important to use dynamic feeders to prevent the flow from becoming static or being interrupted.

SCREENING ALSO INVOLVES PLANNING

Modern screens do not require special foundations and can be installed on reinforced concrete industrial floors at ground level. However, when installing the solution it is necessary to calculate the space needed to work around and above the machine.

This not only facilitates the movement of workers, but also maintenance and safety operations. Screening media with a module-based design also help with repair or replacement of parts, as well as facilitating the handling and transport of components.

Preventive maintenance shutdown? Always

As they work under constant vibration, wear on the screens is natural, especially in welded areas. Therefore, it is important that preventive maintenance is carried out, in addition to always being aware of changes in the behavior of the equipment.

Also, do not forget to clean and lubricate parts in accordance with the manufacturer's manual.

All this care reflects in a more efficient screening and greater productivity!

Industrial screening is no big deal but it will always be a necessary process. Therefore, knowing how to do it correctly makes the work easier and safer.

In addition, preventive maintenance, or maintenance shutdown, and the correct slope and feed calibration are essential to increase productivity. With this, it is possible to use the screens as much as possible and prevent constant stops in production. This is the best way to avoid losses and increase profits!

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