Table 1 Impurity concentrations (ppm) before (SPw) and after thermal annealing
SPw (ref.) | 700°C | 800°C | 900°C | |
---|---|---|---|---|
Fe | 5,100 | 20.77 | 10.54 | 0.41 |
Al | 2,200 | 100.15 | 20.17 | 2.13 |
Ti | 421 | 23.9 | 2.93 | 2.83 |
As | 2 | 0.7 | <0.05 | <0.05 |
P | 16 | 11 | 10 | 10 |
B | 0.7 | <0.05 | <0.05 | <0.05 |
Ni | 5.6 | 3.1 | 1.4 | 0.17 |
Cu | 5.5 | 1.8 | 1.5 | 0.14 |
Ca | 98.1 | 10.21 | 9.85 | 9.1 |
Na | 38 | 15.09 | 8.84 | 1.44 |
Mn | 793 | 297 | 139 | 13.9 |
Mg | 55 | 83 | 71 | 7 |
K | 20 | 3.7 | 2.4 | 2.3 |
Cr | 230 | 107 | 13 | 1.7 |
Co | 7 | 6 | 6 | 6 |
Total (%) | 0.9 | 0.07 | 0.03 | 0.01 |
Purity (%) | 99.10081 | 99.93166 | 99.97034 | 99.99489 |