Densimetric Tables | © Allgaier Process Technology 2022
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Dry enrichment with the GSort instead of conventional wet preparation

Dry enrichment with the GSort instead of conventional wet preparation

The customer

  • The client operates in the mining industry and was the industry leader in Mexico in 2019

The challenge 

  • Traditional wet processing in the mining industry poses several environmental issues and risks for mining companies.
  • New environmental regulations and stakeholder pressure have set new standards and requirements for energy and water use, especially for tailings ponds (water lagoons) in the mining industry. This challenges the industry to separate and sort materials in the most cost-efficient and environmentally friendly way possible.
  • The enormous water consumption and waste generated by conventional wet processing resulted in an increase in operating costs for our customer in a water-scarce environment.
  • The customer was unable to process the material (3-25 mm) using conventional wet/screen processing.
  • The minimum market requirements of 4.2 t/m3 concentration for raw materials from mine areas with concentration less than 3.5 t/m3 could not be met with the equipment at that time (concentration up to +0.5 t/m3).

The solution

For effective dry separation of minerals, several conditions should be met.

  • The minimum difference in absolute density between the heavy fraction and the light fraction should be about 20%. It was also necessary to break up the material by crushing before density separation to separate the minerals.
  • The maximum particle size depends on the absolute density and determines the power requirement of the sorting blower. The minimum size depends on the moisture content. The limit is where the product loses the "free flow" condition (Approx. minimum particle size: 0.5 mm, Approx. maximum particle size: 80 mm).
  • To meet the customer's requirements, the GSort type separation table was chosen, which offers innovative solutions to the environmental and operational challenges of the mining industry.
  • Dry densimetric separation is performed on a vibrating, inclined base. An ascending air stream passes through this base and has two effects on the material. Less dense product floats up without touching the base plate and slides to the bottom of the inclined table. The denser product touches the table and is pushed up by the vibration. The greater the density difference between the products, the larger the particle size bands can be.

The result

Dry enrichment with the GSort offers tremendous advantages over conventional wet preparation.

  • The GSort outperforms established sorting methods with a performance increase of up to 80%.
  • Pre-concentration allows a lower mass flow to enter the subsequent stages, resulting in significant energy savings, lower water consumption, and reduced equipment wear (MSizers supplement equipment at each size reduction step).
  • The customer achieved a high return on investment with a payback period of about 100 days.
  • After installing a second GSort and a Mogensen sizer, the customer was able to process final material between 3 and 25 mm not only from its mine but also from third-party mines.


Densimetric Table GSort for separation in a production hall | © Allgaier Process Technology 2022
Densimetric Tables | © Allgaier Process Technology 2022

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+34 91 5776 277

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