XXXI International Mineral Processing Congress 2024 Proceedings/Washington, DC/Sep 29–Oct 3 3305
Ni recovery (%)AC =42.40 – 1.58 m1 – 1.01 m2
– 0.55 m3 +0.60 m4 – 0.42 m12
+0.01 m22 +0.004 m32 +0.001 m42
+0.086 m1 m2 +0.042 m1 m3
– 0.056 m1 m4 +0.01 m2 m3
– 0.01 m2 m4 +0.03 m3 m4
(3)
The reliability of the regression model was examined
by analysis of variance (ANOVA), as indicated in Table 6.
The significance test was performed at a 95% confidence
level using p-values. The model is said to be statistically
Figure 5. The coconut shell based activated carbon
Table 5. The central composite response table for the
leaching of Ni
Standard Order Run Ni Recovery (%)
57 1 36.68
12 2 27.31
42 3 34.39
62 4 39.22
37 5 36.72
58 6 37.33
35 7 25.83
47 8 67.91
60 9 38.11
17 10 37.77
v 11 37.72
10 12 26.88
16 13 78.46
28 14 37.99
21 15 26.80
38 16 43.78
24 17 44.46
41 18 32.99
1 19 25.84
23 20 34.50
32 21 36.22
9 22 32.13
48 23 38.67
36 24 40.76
27 25 37.89
26 26 39.35
Standard Order Run Ni Recovery (%)
46 27 67.22
25 28 38.26
11 29 27.88
5 30 41.25
6 31 45.40
22 32 60.70
29 33 39.06
20 34 43.37
55 35 44.98
14 36 58.43
19 37 36.24
40 38 45.01
31 39 37.42
2 40 24.13
7 41 56.98
13 42 53.57
34 43 27.02
33 44 25.51
39 45 48.08
45 46 56.75
56 47 38.12
3 48 27.45
52 49 32.45
30 50 37.68
61 51 37.86
51 52 40.84
49 53 35.98
8 54 65.48
18 55 39.42
4 56 29.46
53 57 51.59
50 58 40.07
54 59 31.69
15 60 70.53
44 61 56.76
43 62 29.37
Table 5. The central composite response table for the
leaching of Ni (continued)
Ni recovery (%)AC =42.40 – 1.58 m1 – 1.01 m2
– 0.55 m3 +0.60 m4 – 0.42 m12
+0.01 m22 +0.004 m32 +0.001 m42
+0.086 m1 m2 +0.042 m1 m3
– 0.056 m1 m4 +0.01 m2 m3
– 0.01 m2 m4 +0.03 m3 m4
(3)
The reliability of the regression model was examined
by analysis of variance (ANOVA), as indicated in Table 6.
The significance test was performed at a 95% confidence
level using p-values. The model is said to be statistically
Figure 5. The coconut shell based activated carbon
Table 5. The central composite response table for the
leaching of Ni
Standard Order Run Ni Recovery (%)
57 1 36.68
12 2 27.31
42 3 34.39
62 4 39.22
37 5 36.72
58 6 37.33
35 7 25.83
47 8 67.91
60 9 38.11
17 10 37.77
v 11 37.72
10 12 26.88
16 13 78.46
28 14 37.99
21 15 26.80
38 16 43.78
24 17 44.46
41 18 32.99
1 19 25.84
23 20 34.50
32 21 36.22
9 22 32.13
48 23 38.67
36 24 40.76
27 25 37.89
26 26 39.35
Standard Order Run Ni Recovery (%)
46 27 67.22
25 28 38.26
11 29 27.88
5 30 41.25
6 31 45.40
22 32 60.70
29 33 39.06
20 34 43.37
55 35 44.98
14 36 58.43
19 37 36.24
40 38 45.01
31 39 37.42
2 40 24.13
7 41 56.98
13 42 53.57
34 43 27.02
33 44 25.51
39 45 48.08
45 46 56.75
56 47 38.12
3 48 27.45
52 49 32.45
30 50 37.68
61 51 37.86
51 52 40.84
49 53 35.98
8 54 65.48
18 55 39.42
4 56 29.46
53 57 51.59
50 58 40.07
54 59 31.69
15 60 70.53
44 61 56.76
43 62 29.37
Table 5. The central composite response table for the
leaching of Ni (continued)