Grain Size, mesh μm

Leaching Efficiency, %

Al^*

Mn

Zn

Cu

Fe

−60 - 250

34.8

97.1

92.5

90.0

14.2

−80 - 188

36.0

97.5

94.0

91.2

15.2

−120 - 125

38.7

98.2

94.4

91.7

15.7

−170 - 88

37.2

98.6

93.9

92.2

15.8