Table 3 Study planning matrix.

From: Modeling and development of technology for smelting a complex alloy (ligature) Fe-Si-Mn-Al from manganese-containing briquettes and high-ash coals

No

Coded Variables

 

Natural Variables

 
 

X1

X2

Coal (C), kg

Quartzite (Q), kg

1

1

1

94.18

34.51

2

− 1

1

65.82

34.51

3

1

− 1

94.18

25.13

4

− 1

− 1

65.82

25.13

5

1.41

0

100

29.82

6

− 1.41

0

60

29.82

7

0

1.41

80

36.4

8

0

− 1.41

80

23.2

9–13

0

0

80

29.82

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