Table 2 CCD plan of factors and the results of two obtained responses.

From: Bacterial acidic agents-assisted multi-elemental (Ni, Co, and Li) leaching of used lithium-ion batteries at high pulp densities

Run no.

Symbol code: factors (unit)

Responses (unit)

Sulfur dosage (SD) (g/l)

Inoculum size (v/v)

Initial pH

Sulfate concentration (SC) (g/l)

ΔpH

1

10

6

2

24.3

1

2

10

10

2

25.0

1.25

3

12.5

8

2.5

30.1

1.60

4

15

6

2

37.4

1.15

5

5

6

2

11.6

0.9

6

10

6

2

24.4

0.9

7

12.5

4

2.5

31.9

1.55

8

10

6

2

24.3

1

9

10

6

3

24.3

1.88

10

7.5

4

1.5

17.6

0.68

11

7.5

8

1.5

18.9

0.74

12

10

6

2

24

0.94

13

10

6

1

25.7

0.5

14

10

6

2

24.3

1

15

10

2

2

24.2

0.94

16

10

6

2

24.3

0.9

17

7.5

4

2.5

17.2

1.5

18

7.5

8

2.5

17.5

1.32

19

12.5

8

1.5

31.5

0.9

20

12.5

4

1.5

31.9

0.5

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