Method for preparing technical grade phosphate using wet method phosphoric acid as raw material

A wet-process phosphoric acid, industrial-grade technology, applied in the direction of phosphate, phosphorus oxyacid, etc., can solve the problems of large volume of equipment in the stripping process, slow two-phase clarification and separation speed, increased energy consumption and expenditure, etc., to achieve separation coefficient Increase, reduce energy consumption, and reduce the effect of the process
CN1994871AInactive Publication Date: 2007-07-11YUNNAN CHEM RES INST
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
YUNNAN CHEM RES INST
Publication Date
2007-07-11
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a making method of industry-grade phosphate based on wet process phosphoric acid as raw material, which comprises the following steps: desulfurizing; defluorinating; stripping arsenic; removing heavy metal; decoloring; extracting predisposed wet process phosphoric acid through compound organic solvent of ketone and phosphate ester; washing; reextracting; condensing; post-processing to obtain the product; adopting alkali solution of potassium carbonate, sodium carbonate or alkaline-earth metal as extractor.
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Description

technical field

[0001] The present invention relates to the preparation of phosphates. Specifically, it relates to a method for preparing industrial-grade phosphate using wet-process phosphoric acid as a raw material. Background technique

[0002] Due to the high energy consumption of the production of thermal phosphoric acid, with the increasing shortage of energy, people are more and more willing to use wet phosphoric acid to prepare industrial grade phosphate products. However, wet-process phosphoric acid contains relatively high impurities, and it must be purified before it can be used for the production and preparation of industrial-grade phosphate. For 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.

[0003] The technology of s...

Claims

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