Time, min

Leaching Efficiency, %

Al^*

Mn

Zn

Cu

Fe

30

60

90

105

120

12.7

20.4

29.8

36.0

36.7

61.5

78.2

91.4

98.2

98.2

60.5

71.0

88.0

94.5

94.1

61.2

73.7

87.2

92.2

92.1

9.5

11.2

12.1

12.7

14.7