|
 |
 |
NaFĦĦ( % )
|
Toothpaste-grade |
High-grade |
First-grade |
NaF |
98.5 |
98.0 |
98.0 |
HF |
0.1 |
0.2 |
0.2 |
Na2CO3 |
0.1 |
0.2 |
0.5 |
SO4 |
0.2 |
0.3 |
0.3 |
SiO2 |
0.5 |
0.4 |
0.5 |
Pb |
0.005 |
- |
- |
Fe |
0.005 |
- |
- |
As |
- |
- |
- |
H2O |
0.5 |
0.5 |
0.5 |
Na2SĦĦ( % )
|
Solid |
Shape |
Na2S |
60.0 |
52.0 |
Fe |
00.04 |
0.15 |
Na2SO3 |
2.0 |
- |
Na2CO3 |
3.0 |
4.0 |
Na2S2O3 |
2.0 |
- |
Na metal (%)
Item |
High-class |
First-class |
Qualified |
Na |
99.7 |
99.5 |
99.0 |
K |
0.04 |
0.10 |
- |
Ca |
0.06 |
0.08 |
0.15 |
Fe |
0.001 |
0.001 |
0.001 |
Pb |
0.005 |
0.005 |
0.005 |
|
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