Application of Response Surface Methodology (RSM) for Simultaneous Optimization of Kinetic Parameters Affecting Gold Leaching in Thiosulfate Based Media: A Statistical Approach

Table 3

Response surface design of experiments.

Temp (°C)	Time (h)	[S2O3] (mol.L^−1)	[NH3] (mol.L^−1)	[Cu] (mol.L^−1)	Actual gold recovery	Predicted gold recovery
30	2	1	1.5	0.0025	77.72	76.75
40	2	1	1.5	0.0015	89.62	88.90
30	3	1	1.5	0.0015	80.65	81.70
40	3	1	1.5	0.0025	99.32	98.40
30	2	2	1.5	0.0015	78.33	78.73
40	2	2	1.5	0.0025	98.80	98.13
30	3	2	1.5	0.0025	89.83	89.68
40	3	2	1.5	0.0015	100	99.68
30	2	1	2.5	0.0015	77.67	77.58
40	2	1	2.5	0.0025	98.14	97.77
30	3	1	2.5	0.0025	91.00	91.16
40	3	1	2.5	0.0015	98.99	98.78
30	2	2	2.5	0.0025	86.85	88.69
40	2	2	2.5	0.0015	96.56	97.01
30	3	2	2.5	0.0015	89.78	90.40
40	3	2	2.5	0.0025	99.56	100.00
25	2.5	1.5	2	0.002	75.66	74.95
45	2.5	1.5	2	0.002	99.56	100.00
35	1.5	1.5	2	0.002	84.63	86.01
35	3.5	1.5	2	0.002	99.06	97.59
35	2.5	0.5	2	0.002	86.95	87.88
35	2.5	2.5	2	0.002	96.73	95.73
35	2.5	1.5	1	0.002	87.61	88.12
35	2.5	1.5	3	0.002	96.08	95.49
35	2.5	1.5	2	0.001	87.56	88.31
35	2.5	1.5	2	0.003	95.86	95.29
35	2.5	1.5	2	0.002	90.11	91.80