Table 2.

Results of the Box–Behnken experimental design.

Run	Grinding time (min)	Moisture content (%)	Feeding mass (kg)	Grinding medium proportion (%)	D50 value (μm)	SDF yield (%)
1	20.00	8.00	0.50	90.00	23.54	29.79
2	20.00	6.00	0.75	90.00	22.08	28.04
3	15.00	6.00	0.75	80.00	18.73	18.94
4	15.00	6.00	0.75	100.00	26.83	22.95
5	20.00	4.00	0.50	90.00	20.34	25.78
6	15.00	4.00	0.75	90.00	20.08	19.45
7	20.00	8.00	1.00	90.00	27.32	31.08
8	20.00	4.00	1.00	90.00	26.74	27.04
9	20.00	8.00	0.75	80.00	17.58	28.16
10	15.00	6.00	0.50	90.00	16.89	22.25
11	20.00	4.00	0.75	80.00	21.04	27.72
12	20.00	6.00	1.00	100.00	30.16	29.65
13	15.00	6.00	1.00	90.00	30.80	18.79
14	20.00	8.00	0.75	100.00	30.57	32.69
15	20.00	6.00	1.00	80.00	23.42	26.44
16	20.00	6.00	0.75	90.00	21.60	27.68
17	25.00	6.00	1.00	90.00	24.28	24.00
18	20.00	6.00	0.75	90.00	22.07	28.04
19	25.00	6.00	0.75	100.00	28.93	20.26
20	20.00	6.00	0.75	90.00	21.60	28.55
21	20.00	6.00	0.50	80.00	16.03	26.79
22	25.00	6.00	0.50	90.00	27.47	18.57
23	25.00	4.00	0.75	90.00	26.49	20.20
24	20.00	6.00	0.50	100.00	27.09	26.18
25	20.00	6.00	0.75	90.00	21.66	28.04
26	25.00	8.00	0.75	90.00	23.78	24.10
27	15.00	8.00	0.75	90.00	26.39	24.00
28	20.00	4.00	0.75	100.00	23.89	25.54
29	25.00	6.00	0.75	80.00	20.20	22.24