Method for preparing industrial grade monoammonium phosphate by using raffinate acid through twice neutralizational process

A technology of monoammonium phosphate and raffinate acid, applied in the direction of phosphate, phosphorus oxyacid, etc., can solve the problems of high impurity content, low nitrogen content level, high viscosity of slurry, etc.

Active Publication Date: 2014-07-02
WUHUAN ENG +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a method for producing industrial-grade monoammonium phosphate with raffinate acid through two ammonia neutralizations in view of the above-mentioned prior art, so as to overcome the difficulties in producing industrial-grade monoammonium phosphate with raffinate acid as raw material Problems resulting in high slurry viscosity, low nitrogen levels and high levels of impurities in the product

Method used

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  • Method for preparing industrial grade monoammonium phosphate by using raffinate acid through twice neutralizational process
  • Method for preparing industrial grade monoammonium phosphate by using raffinate acid through twice neutralizational process

Examples

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Embodiment 1

[0022] The raffinate (P 2 o 5 Content by weight 45.6%) mixed with water at a mass ratio of 1:1.5, the diluted raffinate enters the first reactor A, and ammonia is passed through for the first neutralization reaction, the reaction temperature is 70 ° C, to The pH of the material is 3.5, and it is fully matured for 3 hours; after the slurry is filtered, the obtained filtrate enters the second reactor B and passes through ammonia for the second neutralization reaction. The reaction temperature is 55 ° C, and the pH of the slurry is At 4.5, mature again for 3 hours; the slurry is filtered and concentrated, and the concentration ratio is controlled until the relative density of the filtrate reaches 1.37, then cooled to 40°C for crystallization, the crystallization time is 20 minutes, and then the filtrate is centrifuged and dried to obtain industrial grade phosphoric acid monoammonium. After the determination of the main content of the product (in P 2 o 5 Calculated) is 61.08%,...

Embodiment 2

[0024] The raffinate (P 2 o 5 The content is 45.6% by weight) mixed with water at a mass ratio of 1:1, the diluted raffinate enters the first reactor A, and ammonia is passed through to carry out the first neutralization reaction, the reaction temperature is 65 ° C, to The pH of the material is 3.5, and it is fully matured for 3 hours; after the slurry is filtered, the resulting filtrate enters the second reactor B and passes through ammonia for the second neutralization reaction until the pH of the slurry is 4.5, and the reaction temperature is 55°C, aging again, the time is 2 hours; the slurry is filtered and concentrated, the concentration ratio is controlled until the relative density of the filtrate reaches 1.37, then cooled to 40°C for crystallization, the crystallization time is 20 minutes, and then the filtrate is centrifuged and dried to obtain industrial grade phosphoric acid monoammonium. After the determination of the main content of the product (in P 2 o 5 Cal...

Embodiment 3

[0026] The raffinate (P 2 o 5 Content by weight 45.6%) mixed with water at a mass ratio of 1:1.5, the diluted raffinate enters the first reactor A, and ammonia is passed through for the first neutralization reaction, the reaction temperature is 70 ° C, to The pH of the material is 3.5, and it is fully matured for 2 hours; after the slurry is filtered, the resulting filtrate enters the second reactor B and passes through ammonia for the second neutralization reaction until the pH of the slurry is 4.5, and the reaction temperature is 50°C, aging again, the time is 3 hours; the slurry is filtered and concentrated, the concentration ratio is controlled until the relative density of the filtrate reaches 1.37, then cooled to 40°C for crystallization, the crystallization time is 20 minutes, and then the filtrate is centrifuged and dried to obtain industrial grade phosphoric acid monoammonium. After the determination of the main content of the product (in P 2 o 5 Calculated) is 60...

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Abstract

The invention relates to a method for preparing industrial grade monoammonium phosphate by using raffinate acid through twice neutralizational process. The method comprises the steps of a. mixing the raffinate acid and water at a mass ratio to dilute raffinate acid; b. feeding the diluted raffinate acid into a first reactor, introducing ammonia into the first reactor, carrying out neutralization reaction for the first time, and fully curing; c. filtering the cured slurry, feeding the obtained filtrate into a second reactor, introducing ammonia into the second reactor, carrying out neutralization reaction for the second time, and curing again; d. filtering the cured slurry again, concentrating the filtrate, controlling the concentration ratio, and carrying out cooling crystallization to obtain crystal mush; e. carrying out liquid-solid separation on the crystal mush, and drying the obtained crystal to obtain the industrial grade monoammonium phosphate. The method has the beneficial effects that since the raffinate acid is diluted by water, the viscosity and the impurity concentration of the raffinate acid can be reduced, the raffinate acid can be easily conveyed, and the ammonia neutralization reaction can be favorably carried out. The ammonia neutralization is carried out twice, so that most metal cation impurities can be effectively removed under the proper pH value.

Description

technical field [0001] The invention belongs to the production field of wet-process phosphoric acid purification and comprehensive utilization, and in particular relates to a method for preparing industrial-grade monoammonium phosphate by a double-neutralization method of raffinate. Background technique [0002] In recent years, with the maturation of wet-process phosphoric acid purification technology, the production of industrial-grade phosphoric acid and food-grade phosphoric acid by wet-process phosphoric acid has been realized in many enterprises. The cost of producing and purifying phosphoric acid by the wet method is 20%-25% lower than that of the thermal method, and the energy consumption is only 1 / 3 of that of the thermal method. market competitiveness is increasing. [0003] The solvent extraction method is mostly used in the wet process phosphoric acid purification industry. Purification of wet-process phosphoric acid by solvent extraction generally has a phosph...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/28
Inventor 丁一刚陈遵逵郭国清李志刚吴元欣龙秉文邓伏礼刘生鹏
Owner WUHUAN ENG
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