THE METHOD OF THE EXCLUSION OF THE EXCLUSION OF FLUORIDE AND THE RECOVERY OF P2 O5

摘要

The treatment of waste water in manufacturing phosphatic fertilizer consists of three processes. First, the calcium fluoride is separated by reacting the waste water with limestone or slaked lime, controlling pH within the range of 3.5-4.0, and precipitating the calcium fluoride under a polymer precipitator, aqueous anionic polyacrylamide solution. Second, P2O5 is recovered by controlling the pH to 10-12 with the addition of slaked lime into the solution. Third, the solution is neutralized by a sulfuric acid concentration.