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Method and device for producing diammonium phosphate by wet-process phosphoric acid

A technology of wet-process phosphoric acid and diammonium phosphate, which is applied in the direction of phosphate, phosphorus oxyacid, etc., can solve the problems of high labor intensity for workers, high consumption of production auxiliary materials, and a large number of filter presses, so as to achieve intuitive movement and improve The effect of high output rate and high degree of automation

Active Publication Date: 2019-01-29
四川省高宇化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In addition, the current domestic industrial diammonium phosphate manufacturers use filter presses to filter the filtration process. With the same production capacity, the number of matching filter presses required is large, the labor intensity of workers is high, the filter cloth is difficult to disassemble and wash, and the consumption of auxiliary materials is large. poor continuity

Method used

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  • Method and device for producing diammonium phosphate by wet-process phosphoric acid
  • Method and device for producing diammonium phosphate by wet-process phosphoric acid
  • Method and device for producing diammonium phosphate by wet-process phosphoric acid

Examples

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Effect test

Embodiment 1

[0044] [Example 1] such as figure 1 Shown, the method that wet-process phosphoric acid produces diammonium phosphate may further comprise the steps:

[0045] S1: wet-process phosphoric acid: use sulfuric acid to decompose phosphate rock to produce wet-process phosphoric acid;

[0046] S2: Pretreatment of wet-process phosphoric acid: desulfate and defluorinate wet-process phosphoric acid, and then add complexing agent to treat cationic impurities in wet-process phosphoric acid;

[0047] In the wet-process phosphoric acid pretreatment step, a sedimentation and purification step is also included before the desulfurization and defluorination treatment, and the soluble impurities in the wet-process phosphoric acid are precipitated. When wet-process phosphoric acid is produced, in addition to solid impurities, many soluble impurities are in a supersaturated state under storage conditions, so precipitates will slowly precipitate out. Precipitation and purification before desulfuriz...

Embodiment 2

[0055] [Example 2] such as figure 1 Shown, the method that wet-process phosphoric acid produces diammonium phosphate may further comprise the steps:

[0056] S1: wet-process phosphoric acid: use sulfuric acid to decompose phosphate rock to produce wet-process phosphoric acid;

[0057] S2: Pretreatment of wet-process phosphoric acid: desulfate and defluorinate wet-process phosphoric acid, and then add complexing agent to treat cationic impurities in wet-process phosphoric acid;

[0058] S3: One-time neutralization: add polyacrylamide to the pretreated wet-process phosphoric acid, and use gaseous ammonia to neutralize and mature at the same time; feed gaseous ammonia while stirring, and the molar ratio of gaseous ammonia to phosphoric acid to be fed is At 0.8, continue to stir for 25 minutes, and carry out heating treatment, the heating rate is 0.6°C / min, adjust the neutralization degree to 0.8, stop heating, and obtain a solid-liquid mixture;

[0059] S4: primary belt conveyo...

Embodiment 3

[0065] [Example 3] such as figure 1 Shown, the method that wet-process phosphoric acid produces diammonium phosphate may further comprise the steps:

[0066] S1: wet-process phosphoric acid: use sulfuric acid to decompose phosphate rock to produce wet-process phosphoric acid;

[0067] S2: Pretreatment of wet-process phosphoric acid: desulfate and defluorinate wet-process phosphoric acid, and then add complexing agent to treat cationic impurities in wet-process phosphoric acid;

[0068] S3: One-time neutralization: add polyacrylamide to the pretreated wet-process phosphoric acid, and use gaseous ammonia to neutralize and mature at the same time; feed gaseous ammonia while stirring, and the molar ratio of gaseous ammonia to phosphoric acid to be fed is At 0.5, continue to stir for 23 minutes, and carry out heating treatment, the heating rate is 0.5°C / min, adjust the neutralization degree to 0.7, stop heating, and obtain a solid-liquid mixture;

[0069] S4: primary belt conveyo...

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Abstract

The invention discloses a method and device for production of diammonium phosphate from wet process phosphoric acid. The technological method includes: wet process preparation of phosphoric acid; wet process phosphoric acid pretreatment; primary neutralization; primary belt conveyor filtering; second neutralization; second press filter filtering; index adjustment; concentration and crystallization; and separation and drying. The method and device provided by the invention employ wet process extracted phosphoric acid to replace hot process phosphoric acid for preparation of industrial grade potassium dihydrogen phosphate, and reach the purposes of lowering the production cost and enhancing the product market competitiveness. The process involved in the invention adopts mother liquor circulation treatment for depth impurity removal, can well solve the impurity problem in wet process phosphoric, meets the production requirement of industrial grade potassium dihydrogen phosphate, and enables continuous and stable operation of production, thereby reaching the effects of reducing the production cost and enhancing the product market competitiveness.

Description

technical field [0001] The invention relates to a method for industrially producing diammonium phosphate, in particular to a method and a device for producing diammonium phosphate with wet-process phosphoric acid. Background technique [0002] Diammonium phosphate is a high-concentration compound fertilizer, which is widely used in fertilizing various plants because of its high nutrient content. Almost all of the traditional processes use thermal phosphoric acid as raw material for production. Since 2003, due to the accelerated commercialization of electric power in China and the shortage of electricity, the price of thermal phosphoric acid has risen. Many ammonium phosphate manufacturers have to stop production due to high costs, thus As a result, the supply of goods in the market is scarce, and the price of industrial-grade ammonium phosphate has skyrocketed. Many domestic scientific research institutes and phosphate manufacturers are actively carrying out technical resear...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/28
CPCC01B25/28
Inventor 王俊雄曾万中刁友华
Owner 四川省高宇化工有限公司
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