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Fine Screening of Garnet by Mineral Sands Producer

fine screening of garnet from mineral sands

A mineral sands producer used new vibratory screening machines (or repulping equipment) to recover garnet at over 90% efficiency.  The older, conventional vibrating screens were only able to recover material at about 44% efficiency.

The mineral sands 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, New York.  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
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