Wet method phosphoric acid purification method

A wet-process phosphoric acid and phosphoric acid technology, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of high specific gravity and viscosity, difficult phase separation, difficult to remove, etc., to reduce dosage, simplify processes, and reduce filtration. effect of times
CN100400414CActive Publication Date: 2008-07-09YUNNAN CHEM RES INST
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
YUNNAN CHEM RES INST
Publication Date
2008-07-09

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Abstract

The invention discloses a purifying method of wet phosphate, which comprises the following steps: proceeding desulphurization, defluorination, dearsenic, heavy metal removal and decolouration predisposal for wet phosphate; adapting the composite organic solvent of ketone and phosphate to extract the predisposed wet phosphate; producing industrial phosphate through washing, reextraction, and concentration; obtaining food-grade phosphate by deep defluorination and concentration. The invention simplifies the technology and operation to reduce the manufacturing cost, which broadens the dense scale of raw phosphate.
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Description

technical field

[0001] The present invention relates to a method for purifying phosphoric acid. More specifically, it relates to a method for preparing industrial-grade phosphoric acid and food-grade phosphoric acid from wet-process phosphoric acid. Background technique

[0002] Due to the high energy consumption of thermal phosphoric acid production, with the increasingly tight energy sources, people are more and more willing to use wet-process phosphoric acid to prepare industrial-grade and food-grade phosphoric acid, but wet-process phosphoric acid contains high impurities, which must be purified to Meet the requirements of industrial grade and food grade phosphoric acid. Regarding the purification of wet-process phosphoric acid, there are mainly chemical precipitation method, ion exchange method, phosphoric acid concentration purification method, solvent extraction method and crystallization method. At present, solvent extraction method is generally used in industry. ...

Claims

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