A method for producing diammonium phosphate from phosphate rock with high impurity content

A technology for producing diammonium phosphate and impurity content, applied in the direction of phosphate, phosphorus oxyacid, etc., can solve the problem of low effective phosphorus, achieve the effect of strong adaptability and realize large-scale industrial production

Active Publication Date: 2022-06-21
湖北宜化肥业有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In the production process of diammonium phosphate, the Ca of impurities in phosphoric acid 2+ , Mg 2+ , Fe 3+ 、Al 3+ Such metal ions will react with ammonia and phosphoric acid in a certain pH range, making some water-soluble P in diammonium phosphate products 2 o 5 converted to insoluble P 2 o 5 , resulting in low total available phosphorus

Method used

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  • A method for producing diammonium phosphate from phosphate rock with high impurity content

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Experimental program
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Effect test

Embodiment 1

[0036] Take 1000.0g of wet dilute phosphoric acid (25%P 2 O 5 ), filter out the phosphogypsum, transfer the filtrate to the sedimentation tank, add the impurity remover oxalic acid (H 2 C 2 O 4 ) 5.0%, set the temperature in the settling tank to be 60 ° C, get the supernatant and concentrate it until the concentrated solution contains P 2 O 5 The concentration of the phosphoric acid is 44-47%, adding aluminum phosphate, adjusting the viscosity to 33-38mPa·s, the obtained concentrated phosphoric acid is transported to the tubular reactor, and reacts with ammonia gas in the tubular reactor to generate slurry, adjust the slurry The degree of neutralization was 1.56, and the slurry was sprayed on the master batch in the granulator, and the degree of neutralization was increased to 1.84 through secondary ammoniation to generate diammonium phosphate particles. The analysis indicators are: total nutrient% = 63.9, available phosphorus% = 46.5, total N% = 17.8, H 2 0%=2.0.

Embodiment 2

[0038] Take 1000.0g of wet dilute phosphoric acid (25%P 2 O 5 ), filter out the phosphogypsum, transfer the filtrate to the sedimentation tank, add the impurity remover oxalic acid (H 2 C 2 O 4 ) 7.0%, set the temperature in the sedimentation tank to be 60 ° C, take the supernatant and concentrate it until the concentrated solution contains P 2 O 5 The concentration of the phosphoric acid is 44-47%, adding aluminum phosphate, adjusting the viscosity to 33-38mPa·s, the obtained concentrated phosphoric acid is transported to the tubular reactor, and reacts with ammonia gas in the tubular reactor to generate slurry, adjust the slurry The degree of neutralization was 1.56, and the slurry was sprayed on the master batch in the granulator, and the degree of neutralization was increased to 1.84 through secondary ammoniation to generate diammonium phosphate particles. The analysis indicators are: total nutrient% = 64.1, available phosphorus% = 46.3, total N% = 17.4, H 2 0%=2.1. ...

Embodiment 3

[0040] Take 1000.0g of wet dilute phosphoric acid (25%P 2 O 5 ), filter out the phosphogypsum, transfer the filtrate to the sedimentation tank, add the impurity remover oxalic acid (H 2 C 2 O 4 ) 10.0%, set the temperature in the sedimentation tank to be 60 ° C, take the supernatant and concentrate it to the concentration containing P 2 O 5 The concentration of the phosphoric acid is 44-47%, adding aluminum phosphate, adjusting the viscosity to 33-38mPa·s, the obtained concentrated phosphoric acid is transported to the tubular reactor, and reacts with ammonia gas in the tubular reactor to generate slurry, adjust the slurry The degree of neutralization was 1.56, and the slurry was sprayed on the master batch in the granulator, and the degree of neutralization was increased to 1.84 through secondary ammoniation to generate diammonium phosphate particles. The analysis indicators are: total nutrient% = 64.3, available phosphorus% = 46.4, total N% = 17.6, H 2 0%=2.3.

[0041...

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Abstract

The invention provides a method for producing diammonium phosphate from phosphate rock with high impurity content. The method includes the steps of preparing phosphate pulp, filtering, removing impurities, concentrating and granulating. The method can directly use phosphate rock with high impurity content to produce high-grade The diammonium phosphate product of the product index uses oxalic acid as the impurity remover, which not only effectively removes the metal ion impurities in the dilute phosphoric acid, but also ensures the nutrient P 2 o 5 The stability of the method can effectively improve the utilization rate of phosphorus resources. This method requires less investment, has strong adaptability to phosphate rock, is more economical, and is conducive to the realization of large-scale industrial production.

Description

technical field [0001] The invention relates to the technical field of chemical fertilizer production, in particular to a method for producing diammonium phosphate from phosphate rock with high impurity content. Background technique [0002] The reserves of phosphate rock in my country are large, ranking second in the world, which is characterized by less high-quality phosphate rock and more high-impurity phosphate rock. The cost of high-quality phosphate rock remains high, and the profit margin of enterprises is getting smaller and smaller. It is urgent to develop a new technology for the production of diammonium phosphate chemical products using low-cost and abundant high-impurity phosphate rock, and to produce phosphoric acid that meets the indicators of high-quality diammonium phosphate. Diammonium, promote the upgrading of diammonium phosphate production capacity, and take the path of resource-saving sustainable development. [0003] In the production process of diammo...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): C01B25/28
CPCC01B25/28C01P2006/80
Inventor丁天鹏郭锐朱月席军利向东进李靖康张元堂
Owner湖北宜化肥业有限公司