Table 12.
Evaluation of suspended dust samples and their components (major, minor and trace elements) in ferrosilicon production unit from May 2000 to Aug. 2001
| Date | FeSi (mg/m3) | Concentration |
||||||||||
| SiO2 (%) | Al2O3 (%) | CaO (%) | MgO (%) | K2O (%) | Na2O (%) | Mn (×10−6) | Co (×10−6) | Ni (×10−6) | Pb (×10−6) | Fe (×10−6) | ||
| May 2000 | 65.0 | 90.6 | 0.43 | 0.35 | 0.50 | 0.60 | 0.40 | 315.50 | 78.95 | 4.70 | BD | 285.3 |
| Aug. 2000 | 40.0 | 91.7 | 0.47 | 0.30 | 0.48 | 0.57 | 0.38 | 420.60 | 70.90 | 5.40 | BD | 130.5 |
| Nov. 2000 | 17.0 | 89.5 | 0.30 | 0.19 | 0.40 | 0.53 | 0.30 | 310.30 | 60.30 | 3.50 | BD | 100.0 |
| Feb. 2001 | 26.0 | 91.7 | 0.37 | 0.23 | 0.37 | 0.48 | 0.28 | 370.60 | 85.40 | 7.40 | BD | 100.3 |
| May 2001 | 38.0 | 92.0 | 0.40 | 0.27 | 0.55 | 0.40 | 0.33 | 410.70 | 90.30 | 4.70 | BD | 989.5 |
| Aug. 2001 | 53.0 | 93.6 | 0.35 | 0.25 | 0.60 | 0.50 | 0.25 | 530.60 | 88.70 | 8.00 | BD | 981.0 |
| Mean | 35.8 | 91.5 | 0.45 | 0.27 | 0.50 | 0.51 | 0.32 | 393.05 | 80.40 | 5.60 | BD | 431.0 |
BD: Below detection limit