PROCESS FOR PRODUCING TECHNICAL GRADE PHOSPHORIC ACID FROM SEWAGE SLUDGE ASH

PROCESS FOR PRODUCING TECHNICAL GRADE PHOSPHORIC ACID FROM SEWAGE SLUDGE ASH

The present invention refers to an improved process for recovering phosphoric acid from sewage sludge ash, said process comprising a leaching step; a transforming step for converting phosphate metallic salts into phosphoric acid; a solvent extraction of the phosphoric acid from the leached solution...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: ÁLVAREZ CARREÑO, Carlos, FRADES TAPIA, María, PINEDO GONZÁLEZ, Mª Teresa, MEJÍAS CORDERO, Ana Belén
Format: Patent
Sprache:eng ; fre ; ger
Schlagworte:
CHEMISTRY
COMPOUNDS THEREOF
INORGANIC CHEMISTRY
METALLURGY
NON-METALLIC ELEMENTS
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Beschreibung
Zusammenfassung:The present invention refers to an improved process for recovering phosphoric acid from sewage sludge ash, said process comprising a leaching step; a transforming step for converting phosphate metallic salts into phosphoric acid; a solvent extraction of the phosphoric acid from the leached solution with an organic solvent; a washing step for removing sulfuric acid; and stripping of phosphoric acid to obtain an aqueous solution containing phosphoric acid.