Research Article
Environmental Risk Assessment System for Phosphogypsum Tailing Dams
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 | | 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 |
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