Sulfuric acid conc., M

Leaching Efficiency, %

Al^*

Mn

Zn

Cu

Fe

0.2

0.5

0.8

1.0

14.3

36.7

54.0

72.6

74.3

98.2

98.7

98.7

73.2

94.1

91.2

92.0

76.4

92.1

88.5

87.3

11.9

14.7

16.9

20.3