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.
Results
- 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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