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.
- 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.