Chemistry of inorganic compounds – Halogen or compound thereof – Binary fluorine containing compound
Patent
1982-12-27
1984-09-18
Heller, Gregory A.
Chemistry of inorganic compounds
Halogen or compound thereof
Binary fluorine containing compound
423167, 423320, 423321R, 210915, 241 15, C01D 302, C01F 100, C01B 2516
Patent
active
044723687
ABSTRACT:
An economical process for treating the acidic pond water to be used in the internal grinding circuit of a wet process phosphoric acid plant. Water is added to a quantity of a hydratable calcium compound, such as quicklime, to form a slaked lime slurry. A sufficient quantity of the slaked lime slurry is reacted with the acidic pond water to obtain a low fluoride solution having a fluoride content less than about 300 ppm and a pH in the range from about 2.0 to about 3.0, preferentially in the range 2.6-2.8, whereby calcium fluoride is precipitated. The precipitate bearing low fluoride solution is then clarified and the precipitate removed as underflow from the clarifier and transferred to the gypsum pond. In the preferred embodiment, the clarified low fluoride water is fed to the ball mill and is mixed with the phosphate rock being crushed. Removal of fluoride from the pond water solution reduced the "blinding effect" of the fluoride and permits the calcium carbonate in the phosphate rock to neutralized the acidic pond water to minimize corrosion in the mill and elsewhere in the plant. The resulting slurry from the ball mill is about 55% to 65% solids and ranges in pH range from about 5.0 to about 5.5. The phosphate rock slurry is then passed through a hydroclone circuit where the larger (heavier) particles are removed for recycling to the ball mill and the remaining lightweight particles in the rock slurry are processed by phosphoric acid plant.
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patent: 4374810 (1983-02-01), O'Neill
patent: 4402923 (1983-09-01), Lang
Chang Jesse S.
Clevenger Kyle D.
O'Neill Padraic S.
Weston Charles W.
Agrico Chemical Company
Heller Gregory A.
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