Table 4.
List for investigation of the tailings of the XX phosphorus chemical industry in Yunnan.
| General information | |
| Total storage capacity | 9.8 million m3 |
| Starting date | 2003.06 |
| Service period | 14.86 years |
| Type of tailings | Valley Type |
| Dam height | 45 m |
| Storage capacity | 8639737 t |
| Damming mode | Upstream tailings dam |
| Comprehensive utilization | 6.84 × 105 t |
| Disposed quantity | 1.15 × 107 t |
| Physical-chemical analysis of phosphogypsum | |
| Element | Content (%) |
| Water content | 24.20 |
| CaO | 27.8 |
| Fe2O3 | 0.10 |
| Al2O3 | 0.53 |
| MgO | 0.05 |
| K2O | 0.13 |
| Na2O | 0.13 |
| SO4 − | 33.9 |
| F | 0.49 |
| SiO2 | 11.85 |
| P | 0.7 |
| Extraction toxicity | |
| Index | Unit (mg/L) |
| pH | 5.73 |
| Cu | <0.02 |
| Pb | <0.1 |
| Zn | 0.126 |
| Cr | <0.05 |
| Cd | <0.005 |
| Be | <0.005 |
| Ba | 4 |
| Ni | <0.04 |
| As | 0.0088 |
| Se | 0.0004 |
| Ag | <0.01 |
| Hg | 0.0015 |
| Cr6+ | <0.004 |
| Cyanide | <0.001 |
| Fluoride | 6.49 |
| Methyl mercury | <10 ng/L |
| Ethyl mercury | <20 ng/L |