Case

Fluidization water

(l/min)

Weight

recovery (%)

Final concentrate grade

(% Fe)

Rougher spiral concentrate grade

(% Fe)

Note

No HC

34.4

66.1

57.2

Circuit with cleaner/recleaner spirals

A

400

33.0

64.9

59.8

Initial tuning of the rougher spirals

B

500

32.9

66.0

59.8

Initial tuning of the rougher spirals

C

600

32.6

66.7

59.8

Initial tuning of the rougher spirals

D

600

34.1

66.1

58.6

Reduced wash water to the rougher spirals