Metso Full portfolio Flotation Froth Management Upgrade
Optimize flotation cell froth carry rates, lip loading properties, and mass pull stability with our custom designed froth recovery set-up. The optimal launder and crowder design helps you maximize your flotation cell performance and achieve your grade and recovery targets.

Flotation upgrades to help you reach your sustainability and production targets

Higher metallurgical recovery


Increased froth collection

Easy to upgrade existing cells


Upgrade existing cells with a launder configuration

Increased value


Recover more valuable material & reduce loss to tailings

  • Enables easier formation of thicker froth beds
  • Controls directional flow of froth towards the launder
  • Improves froth properties and stability even in low grade/mass pull applications
  • Optimizes froth carry rate (FCR) and lip loading (LL) for each flotation duty by modifying the cell froth area and lip length
  • Minimizes transportation distance to prevent particle drop out from froth
Flotation Froth Management Upgrade

Optimize cell froth carry rates, properties, and stability while achieving thicker froth beds with a custom-designed froth recovery set-up from Metso.

There are limitations to the volume of material the froth phase can support and transport to the flotation cell’s launder lip in any given period. This is known as the froth carry rate (FCR), and is expressed as t/m²h, or the amount of material that 1 m² of froth can carry to the launder lip in an hour. In addition, lip loading (LL, t/mh), which is the quantity of concentrate pouring into the launder per meter of lip, is an important factor for launder design.

Too much or too little froth crowding leads to a non-optimal FCR. Problems with the level of froth crowding typically arise for one or more of the following reasons:

  • Insufficient data is available during the design phase to calculate the correct FCR down a bank of cells
  • The safety margin calculated by the design engineer is too wide
  • A change in feed grade or capacity, leading to a larger or smaller amount of froth flowing to the concentrate. This directly affects the FCR and can result in the froth area being too large for the cell duty

Launders are an essential part of any flotation cell, and using a launder with the correct design and orientation for your specific application helps to ensure optimal metallurgical performance. Installing the wrong type of launder will make it difficult or even impossible to achieve your grade and recovery targets. Frothing problems can often occur when froth dries on top of a cell or when an insufficient amount of froth is formed. These problems are often a result of non-optimal lip length, froth area, or transport distance.


This service is available for both Metso and other brand flotation machines. It includes:

  • Recalculation of optimum froth area in relation to FCR
  • Recalculation of lip length to optimize lip load for specific cell duty
  • New froth recovery design: radial, peripheral, double launder, center, or custom
  • Froth cone
  • Installation manuals and procedures
  • Optional installation, commissioning, and ramp-up services

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