Method for catalytically improving wet-process phosphoric acid steam stripping defluorination efficiency

A wet-process phosphoric acid and defluorination technology, which is applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of defluorination efficiency and yield impact, and achieve improved defluorination efficiency, good phosphoric acid quality, and low impurity content Effect

Active Publication Date: 2020-02-21
YUNNAN PHOSPHATE CHEM GROUP CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to provide a method for catalytically improving the defluorination efficiency of wet-process phosphoric acid stripping, and to solve the problem of the influence of fluorine-containing complexes on defluorination efficiency and yield in stripping defluorination

Method used

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  • Method for catalytically improving wet-process phosphoric acid steam stripping defluorination efficiency

Examples

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Effect test

Embodiment 1

[0035] A 100,000-ton / year feed-grade phosphoric acid plant in a phosphoric acid plant uses a tower-type air blowing deep defluorination process to purify phosphoric acid. Firstly, the raw material phosphoric acid is treated with arsenide removal and heavy metal removal, and then it is clarified and filtered to obtain P 2 o 5 The mass concentration is 41%P 2 o 5 , F content of 0.5%, solid content of 0.4% clarified concentrated phosphoric acid.

[0036] Add 80m of purified concentrated phosphoric acid from the clear acid collection tank to the connecting tank of the defluorination tower 3 , the amount of catalyst added is 3.8m 3 , the catalyst is EDTA, the mass concentration is 5%; the defluorination agent is 5.7m 3 , the defluorinating agent is white carbon black, and the mass concentration of the defluorinating agent is 9%. After mixing evenly, it is heated by steam, and the phosphoric acid is heated to 90°C and then sent to the defluorination tower for circulating spray...

Embodiment 2

[0040] A 100,000-ton / year feed-grade phosphoric acid plant in a phosphoric acid plant uses a tower-type air blowing deep defluorination process to purify phosphoric acid. Firstly, the raw material phosphoric acid is treated with arsenide removal and heavy metal removal, and then it is clarified and filtered to obtain P 2 o 5 The mass concentration is 43.28%P 2 o 5 , F content of 0.82%, solid content of 0.71% clarified concentrated phosphoric acid.

[0041] Add 80m of purified concentrated phosphoric acid from the clear acid collection tank to the connecting tank of the defluorination tower 3 , the amount of catalyst added is 1.6m 3 , the catalyst is malonic acid, the mass concentration is 12%; the defluorination agent is 7.6m 3 , the defluorination agent is active SiO 2 , the mass concentration of the defluorinating agent is 11%. After mixing evenly, heat it with steam, heat the phosphoric acid to 105°C and send it to the defluorination tower for internal circulation sp...

Embodiment 3

[0045] A 100,000-ton / year feed-grade phosphoric acid plant in a phosphoric acid plant uses a tower-type air blowing deep defluorination process to purify phosphoric acid. Firstly, the raw material phosphoric acid is treated with arsenide removal and heavy metal removal, and then it is clarified and filtered to obtain P 2 o 5 The mass concentration is 46.5%P 2 o 5 , F content of 0.9%, solid content of 1.0% clarified concentrated phosphoric acid.

[0046] Add 80m of purified concentrated phosphoric acid from the clear acid collection tank to the connecting tank of the defluorination tower 3 , the amount of catalyst added is 2.7m 3 , the catalyst is citric acid, the mass concentration is 7%; the defluorination agent is 7.1m 3 , the defluorinating agent is diatomite, and the mass concentration of the defluorinating agent is 13%. After mixing evenly, heat the phosphoric acid with steam to 110°C and send it to the defluorination tower for circulating spraying, with a circulati...

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Abstract

The invention discloses a method for catalytically improving wet-process phosphoric acid steam stripping defluorination efficiency, and relates to the technical field of wet-process phosphoric acid defluorination processes. By carrying out arsenic removal and heavy metal removal purification procedures on raw material phosphoric acid, clear purified concentrated phosphoric acid with low impurity content can be obtained; after a defluorination catalyst is added into the purified concentrated phosphoric acid, the defluorination catalyst and a defluorination agent are mixed and heated, and then steam stripping defluorination is performed, so that the defluorination resistance can be effectively reduced, the defluorination efficiency is improved, the consumption of the defluorination agent, steam and electricity in the defluorination process is reduced, and the defluorination cost is reduced; in the defluorination process, a steam stripping defluorination process is adopted, and an indirect steam heating mode is adopted; the defluorinated phosphoric acid production efficiency is high, the yield is high, the consumption is low, the phosphoric acid quality is good, the impurity content is low, the phosphorus-fluorine ratio (P2O5/F) can reach 285 or above, and the defluorinated phosphoric acid can be directly used for producing feed-grade calcium phosphate.

Description

technical field [0001] The invention relates to the technical field of wet-process phosphoric acid defluorination technology, in particular to a method for catalytically improving the stripping defluorination efficiency of wet-process phosphoric acid. Background technique [0002] Since the 1950s, countries around the world have used wet-process phosphoric acid as a raw material to produce calcium phosphate as a feed additive, of which calcium hydrogen phosphate is the main one. The key technology of using wet-process phosphoric acid to produce feed phosphate is the purification of wet-process phosphoric acid, that is, the content of fluorine and other impurities in wet-process phosphoric acid can be purified to meet the requirements of producing feed-grade phosphate. The pros and cons of defluorination technology directly affect the yield and quality of the final product. [0003] There are two main techniques for wet-process phosphoric acid defluorination: chemical precip...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/237C01B25/238
CPCC01B25/2375C01B25/238
Inventor 周琼波牛司江张儒学方竹堃刘正东朱剑锋周云刚李杰李键李建闻谭顺仓杨雄俊
Owner YUNNAN PHOSPHATE CHEM GROUP CORP
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