Do you know how to calculate screening efficiency in mining?

This is one of the questions that most often comes to Máquinas Furlan engineers.

The engineers explained that three factors influence the classification of the processed material. One of them calculates how much of the processed material fits into the desired granulometry. The resulting percentage will indicate whether the screening is efficient.

Learn more in this article. And get to know Furlan's line of High Frequency Vibrating Screens. These devices have a wide range of screen adjustment options and greater vibration power, increasing classification efficiency.

Screening in mining can always be improved

Screening is a crucial step in the mining industry, with great potential for improvements in practices. These measures often allow for increased productivity in the business.

In general terms, we are talking about the classification of minerals in dry or wet processes. A project begins by evaluating the type of rock available and presents, as its main objective, the obtaining of the largest possible quantity of final products with the desired granulometry.

In this way, the market offers mining companies different types of solutions. The decision of those who invest takes into account the working capacity and efficiency of the machine.

Details make a difference in productivity, such as mesh opening, feed load and vibration speed.

In addition to being efficient and high-performance, the industry requires equipment that is easy to operate. High energy efficiency; a structure and parts that are resistant to wear and abrasion; and safety for operators are also important.

In the routine of mining companies, good practices include preventive maintenance and quick shutdowns to replace parts. There is still room for environmental gains, which are seen as differentiating factors by the consumer market.

How to calculate screening efficiency in mining

The equipment in the Máquinas Furlan catalog has these characteristics. Furlan sieves are produced considering the 3 main factors that influence the efficiency of mineral classification, which are:

1. Stratification of rocks;

2. Equipment vibration mechanism;

3. Statistical probability applied to screening.

In general, screening efficiency in mining is part of step 3 of the list above, taking the other two occurrences into account. It results from the amount of ore that passes through the screen of the screen and the amount that should or should not pass through the screen.

In detailing the process, one or more decks receive the rocks received, for example, from crushing. This material will then be classified. For example, if 5% of the processed product is outside the desired granulometry range (either more or less), we can say that the screening was 95% efficient.

Furlan's Engineering team explains that, normally, a sieve is considered efficient when it releases 90 to 95% of the evaluated material.

Several factors influence the high efficiency of the sieve. It can be mentioned that specificity, amplitude and frequency of operation are critical variables in the quality of the final product.

In this vibrating mechanism, Furlan engineers emphasize the importance of the counterweight. In some cases, the fan-shaped counterweight allows for more open or external configurations, which influence the amplitude – and, consequently, the equipment’s performance.

Furlan screens: improvements to increase efficiency

Quarries and mining companies have praised the results of Furlan's High Frequency Vibrating Screens (PVAF). The equipment is highly efficient in dry classification of fine materials, which have specifications below 5 mm up to 0.3 mm mesh.

Suitable for a variety of applications, it generates products such as fine and coarse sand, ceramics, rock dust, among others. The excellence in the classification of Furlan equipment is the result of several factors, such as a wide range of adjustments in orientation and variable adjustments in the vibration frequency on each deck.

The vibrators installed in the deck crossbars ensure greater vibration power. Amplitude and frequency are individually adjusted.

Recently, the EAE Máquinas Magazine website presented the benefits of Furlan screens. The productivity and high quality of the steel used in the equipment were two highlights in the report.  

The metal structure is robust and easy to assemble, and can be adapted to suit the layout of the plant. The catalogue includes accessories such as discharge spouts, access ladders and maintenance platforms.

Are you interested in learning more about Furlan's high-frequency vibrating screens? Send us a message and we will evaluate the screening process at your plant.  

Furlan's catalog also includes Vibrating Screens (PVA) and Modular Screens (PVM), a line of highly durable parts and one of the most attractive Consulting services on the market.