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Production method and system of diammonium orthophosphate

A production method and technology of diammonium phosphate, applied in the direction of ammonium orthophosphate fertilizer, phosphate, phosphorus oxyacid, etc., can solve the problems of inconsistent product particle size, nitrogen content less than 18%, unrounded appearance, etc. , to achieve the effect of low moisture content, uniform particle size, and not easy to agglomerate

Active Publication Date: 2016-12-21
HUBEI XIANGYUN GROUP CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 1. The nitrogen content in the product is less than 18%, usually around 17.5%
[0006] 2. The appearance is not round and regular, easy to agglomerate, and the particle size of the product does not meet the requirements
[0007] 3. High energy consumption

Method used

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  • Production method and system of diammonium orthophosphate
  • Production method and system of diammonium orthophosphate

Examples

Experimental program
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Embodiment 1

[0042] see figure 1 , Embodiment 1 provides a kind of production method system of diammonium phosphate, comprising ammonia station, phosphoric acid storage tank, washing system, crusher, hot blast stove, return material structure, neutralization tank, tubular reactor, granulator, Dryer, sorting sieve, fluidized bed cooler, swinging sieve and packaging structure, etc. Among them, the ammonia station is connected with the neutralization tank, the tubular reactor and the granulator; The outlet of the material (greater than 4mm), the crusher and the inlet of the return structure are connected in sequence, the outlet of the fine material (less than 2mm) of the sorting sieve is connected with the inlet of the return structure, the outlet of the qualified material (2-4mm) of the sorting sieve, The fluidized bed cooler and the swinging screen are connected to the packaging structure in sequence, the outlet of the return structure is connected to the return inlet of the granulator, an...

Embodiment 2

[0045] see figure 1 , embodiment 2 provides a kind of production method of diammonium phosphate, comprises the following steps:

[0046] (1) Pre-neutralization: the concentrated phosphoric acid from the phosphoric acid storage tank and the washing liquid from the washing system are added to the neutralization tank, and react with the ammonia from the ammonia station. The reaction temperature is 115°C and the amino acid ratio is 0.001t / m 3 , the neutralization degree at the end point is 0.55, the slurry density is 1.51g / cm³, the water content of the slurry is 18%, the volume of the washing liquid used in this step is 1 / 3 of the neutralization tank, and the concentration of the washing liquid is 1.46g / cm³ , and the degree of neutralization is 0.55.

[0047] (2) Neutralization: The pre-neutralization slurry obtained in step (1) is passed into a tubular reactor containing 1 / 2 volume (from the washing system) of washing liquid, and reacts with ammonia from the ammonia station, and...

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Abstract

The invention discloses a production method and system of diammonium orthophosphate, and belongs to the technical field of chemical industry. The method comprises the following steps of (1) performing preneutralization: adding strong phosphoric acid and washing liquid to a neutralization tank, performing a reaction with ammonia, wherein the reaction temperature is 110-120 DEG C, the neutralization degree is 0.5-0.6, the slurry density is 1.45-1.55g / cm<3>, the slurry moisture is 16-20%, and the volume of the washing liquid is one fourth to one third of that of the neutralization tank; (2) performing neutralization: enabling the pre-neutralized slurry to be led into a tubular reactor containing the washing liquid which is one third to two thirds of the volume of the tubular reactor, and performing a reaction with the ammonia, wherein the reaction temperature is 100-140 DEG C, and the neutralization degree is 1.45-1.53; and (3) performing granulation: sending the neutralized slurry into a granulation machine, enabling the ammonia to be led, and performing granulation, wherein the neutralization degree is 1.80-1.90; and (4) obtaining finished products: drying granules, screening the dried granules, and cooling the screened granules so as to obtain the finished products.

Description

technical field [0001] The invention belongs to the technical field of fertilizer production, in particular to a production method and system of diammonium phosphate. Background technique [0002] Diammonium phosphate, also known as diammonium hydrogen phosphate, ammonium hydrogen phosphate, is a white crystal with the molecular formula (NH 4 ) 2 HPO 4 , Soluble in water, decompose when heated to 155°C, but it is also possible to gradually decompose and release ammonia gas at room temperature to form ammonium dihydrogen phosphate. Product specifications are: 64% (N18:P 2 o 5 46), 61% (N17:P 2 o 5 45), 57% (N15:P 2 o 5 42). In order to increase the storage resistance, some products are added with wrapping agent during the production process, so that the appearance of the product is brown or yellow. [0003] At present, the "neutralization granulation process" and "crushing and screening system" processes in the production process of the company's diammonium phosphat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/28C05B7/00
CPCC01B25/28C01P2006/82C05B7/00
Inventor 胡挺陈志炎解奇兵叶良俊章磊祝翠华余双强
Owner HUBEI XIANGYUN GROUP CHEM