US 12,534,368 B2Granted

Production of potassium phosphates

AssigneeEasymining Sweden AB

InventorsYariv Cohen, Christian Tunsu, Angela Van Der Werf, Daniel Boman

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Abstract

An arrangement for production of fully soluble, pure and well-defined mono- or di-potassium phosphates, comprises an extraction section, a stripping section and end treatment arrangements. The extraction section performs a liquid-liquid extraction of phosphate between a feed liquid comprising phosphoric acid. The stripping section performs a liquid-liquid extraction of phosphate between solvent loaded with phosphate and a strip solution. The solvent depleted in phosphate is recirculated to the extraction section for further extraction of phosphate. The strip solution is an aqueous potassium phosphate solution. The end treatment arrangements comprise a source of potassium base, an adding arrangement, a cooling arrangement, a precipitate remover and a recirculation system.

Claims12

Dependent claims

A method for production of pure potassium phosphates, comprising the steps of:

extracting phosphate from a feed liquid comprising phosphoric acid by a liquid-liquid extraction into a solvent;
stripping said solvent of at least a part of said phosphate by a liquid-liquid extraction using a strip solution into a strip solution loaded with stripped phosphate;
said strip solution being an aqueous potassium phosphate solution;
separating said strip solution loaded with stripped phosphate and said solvent at least partially depleted in said phosphate;
recirculate said solvent at least partly depleted in said phosphate for further extraction of said phosphate in said step of extracting;
adding a potassium base into at least a partial stream of said strip solution loaded with stripped phosphate;
cooling off heat generated when said potassium base is added into said at least a partial stream of said strip solution loaded with stripped phosphate;
removing crystals from said strip solution loaded with stripped phosphate and added with said potassium base;
and
recirculating said strip solution after said step of removing crystals for use as input strip solution in said step of stripping.

7 more elements

Dependencies are inferred from the claim text.