Oxalic acid conc., M

Leaching Efficiency, %

Al^*

Mn

Zn

Cu

Fe

0.00

0.08

0.16

0.24

0.32

0.40

12.5

21.8

28.2

36.7

35.9

36.5

1.5

68.5

74.4

98.2

99.5

98.5

51.0

67.0

83.0

94.1

94.2

93.6

64.2

72.1

81.1

92.1

92.8

93.2

9.8

10.5

11.2

14.7

14.6

15.1