Method for producing full-water-soluble monoammonium phosphate by phosphoric acid by wet process

A wet-process phosphoric acid and monoammonium phosphate technology, which is applied to ammonium orthophosphate fertilizers, phosphates, phosphorus oxyacids, etc., can solve the problems of high production cost of water-soluble monoammonium phosphate, unfavorable promotion of drip irrigation and fertilization, etc., and achieve product quality Good, cost saving, high product purity effect

Active Publication Date: 2013-12-25
SICHUAN HONGDA
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Problems solved by technology

[0005] The purpose of the present invention is to overcome the high production cost of water-soluble monoammonium phosphate in the prior art, which is not conducive to the promotion of drip irrigation and fertilization, and to provide a method for producing fully water-soluble monoammonium phosphate by wet process phosphoric acid

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  • Method for producing full-water-soluble monoammonium phosphate by phosphoric acid by wet process
  • Method for producing full-water-soluble monoammonium phosphate by phosphoric acid by wet process

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Embodiment 1

[0025] Such as figure 1 The technological process shown, phosphate rock slurry and sulfuric acid extraction to produce wet-process phosphoric acid, the main technical indicators of the obtained desulfurized phosphoric acid are: P 2 o 5 Concentration 18.5%, SO 3 Concentration 0.65%, F concentration 1.5%. The obtained desulfurized phosphoric acid is neutralized with gaseous ammonia in the ammonia neutralization reactor. After the reaction is completed, the end point of the neutralized slurry is PH=4.0, and the filter press performs liquid-solid separation of the neutralized slurry to obtain a solid phase slag And filtrate, the solid phase slag water content is 15-40%, and the solid phase slag (filter residue) is used for the production of ordinary phosphorus and nitrogen element fertilizers. Concentrate the filtrate from the press filtration of the neutralized slurry to a density of 1.42 / cm 3 Fully water-soluble monoammonium phosphate slurry. The concentrated fully water-so...

Embodiment 2

[0027] Such as figure 2 The technological process shown, phosphate rock slurry and sulfuric acid extraction to produce wet-process phosphoric acid, the main technical indicators of the obtained desulfurized phosphoric acid are: P 2 o 5 Concentration 21.2%, SO 3 Concentration 0.7%, F concentration 1.7%. The obtained desulfurized phosphoric acid is neutralized with gaseous ammonia in the ammonia neutralization reactor, and the pH of the end point of the neutralized slurry is 4.2 after the reaction is completed. The solid-liquid separation is carried out by adopting the method of sedimentation separation first, followed by pressure filtration treatment, to obtain solid-phase slag and filtrate, the water content of the solid-phase slag is 15-40%, and the solid-phase slag is used for the production of ordinary phosphorus and nitrogen element fertilizers. Concentrate the filtrate from the press filtration of the neutralized slurry to a density of 1.43g / cm 3 Fully water-soluble ...

Embodiment 3

[0029] Such as figure 2 The technological process shown, phosphate rock slurry and sulfuric acid extraction to produce wet-process phosphoric acid, the main technical indicators of the obtained desulfurized phosphoric acid are: P 2 o 5 Concentration 25.5%, SO 3 Concentration 0.8%, F concentration 1.85%. The obtained desulfurized phosphoric acid is neutralized with gaseous ammonia in the ammonia neutralization reactor, and after the reaction is completed, the pH of the end point of the neutralized slurry is 3.8. The solid-liquid separation is carried out by adopting the method of sedimentation separation first, followed by pressure filtration treatment, to obtain solid-phase slag and filtrate, the water content of the solid-phase slag is 15-40%, and the solid-phase slag is used for the production of ordinary phosphorus and nitrogen element fertilizers. Concentrate the filtrate from the press filtration of the neutralized slurry to a density of 1.39g / cm 3 Fully water-solubl...

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Abstract

The invention relates to the field of phosphorus chemical industry, and specifically relates to a full-water-soluble monoammonium phosphate production device which mainly comprises a neutralizing system, a solid-liquid separating system, a concentrating system, a drying system, a finished product collecting system and a tail gas treatment system. The adopted high concentration full-water-soluble monoammonium phosphate production device for producing full-water-soluble monoammonium phosphate has the advantages of high production capacity and low energy consumption. Crystallizing and filtering steps are not needed, and dust in tail gases has minimum influence on the environment, so that the method has a good economic benefit.

Description

technical field [0001] The invention relates to the field of phosphate fertilizer production, in particular to a method for producing fully water-soluble monoammonium phosphate from wet-process phosphoric acid. Background technique [0002] At present, the traditional fertilizer industry in my country's phosphorus chemical industry has serious overcapacity and unreasonable structure. Improving product technology content and product value is the direction of structural adjustment of the phosphorus chemical industry. At the same time, the water and fertilizer integration technology has been recognized as the best technology in the world to improve the utilization rate of water and fertilizer resources. Compared with traditional fertilization, water and fertilizer integration technology saves water, fertilizer, labor, high efficiency and increased production. As an important supporting product of water and fertilizer integration technology, fully water-soluble monoammonium pho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/28C05B7/00
Inventor 王大为杨守明鲜云芳王德昆张勇杨健胡伟程海中范享亮代应洪
Owner SICHUAN HONGDA
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