Fine Screening of Garnet by Mineral Sands Producer

fine screening of garnet from mineral sands

A Mineral Sands Producer used a new fine screening machines (or repulp equipment) to recover Garnet at over 90% efficiency.  The older, conventional vibrating screens were only able to recover material at about 44% efficiency.

The producer was using conventional vibrating screens in a 0.30mm screening application to produce two garnet-rich intermediate products in two sizes.  Later processing required high screening efficiency in the wet circuit to recover the final garnet and other high value products.  Unfortunately, a significant quantity of misplacement of size fractions, especially Garnet, continued to occur.

To overcome this problem, extensive testing was done at Derrick Corporation’s full-scale test lab in Buffalo, NY.  The tests were highly successful and results indicated that less than 10% fines (-0.3mm) can be achieved in the oversize material using Derrick® Repulp screens.

On the basis of the lab results, the Mineral Sands Producer replaced the conventional screening equipment with 3 Derrick 4×10 Repulp screening machines.

flow diagram repulp wet screening machines


  • Equipment is lighter, smaller and more compact than previous screening machines
  • Dramatic increase in coarse Garnet production
  • Cleaner product
  • Less work by dry circuit
  • Power consumption for 2 Derrick machines is less than was required for a single conventional screening machine

Contact Tinsley Company for more information about fine screening of Garnet from mineral sands.

Derrick Authorized Sales Representative


Fine Screening of Garnet by Mineral Sands Producer was last modified: March 5th, 2017 by Grant Rice