Formula and method for curing soluble phosphorus, eutectic phosphorus, soluble fluorine and ammonia nitrogen in fresh phosphogypsum of rotary table type vacuum filter
By treating phosphogypsum discharged from a large rotary table vacuum filter with agents such as calcium hydroxide and anionic polyacrylamide, stable precipitates are generated, which solves the problem of pollutant spillage of soluble phosphorus, eutectic phosphorus, soluble fluorine and ammonia nitrogen in phosphogypsum, achieving low-cost harmless treatment and meeting the new environmental protection standards.
Patent Information
- Application Number
- CN202511457751.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-13
- Publication Date
- 2025-12-16
AI Technical Summary
Existing technologies are insufficient to effectively treat phosphogypsum discharged from large rotary table vacuum filters, resulting in the spillage of pollutants such as soluble phosphorus, eutectic phosphorus, soluble fluorine, and ammonia nitrogen, which fails to meet the requirements of the new environmental protection standards and has high costs for harmless treatment.
Fresh phosphogypsum was treated with common industrial agents such as calcium hydroxide, anionic polyacrylamide, magnesium chloride, aluminum chloride, deacetylated chitin, and potassium dichromate by mixing, stirring, and aging to adjust the pH value to 8.5-9, thereby generating a stable precipitate and removing soluble pollutants.
The concentration of fluoride in the phosphogypsum leachate was significantly reduced to below 4 mg/L, achieving the harmless treatment of phosphogypsum, reducing treatment costs, and enhancing the application value of phosphogypsum.