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Method for improving surface glass sensation of diammonium phosphate

A diammonium phosphate and surface glass technology, applied in ammonium orthophosphate fertilizers, phosphates, phosphorus oxyacids, etc., can solve the problems of limited process flow, easy agglomeration of products, and products that are not too round, and achieve a glass feeling. strong effect

Inactive Publication Date: 2019-01-25
HUBEI FORBON TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] 4. Permeability: Pure ammonium phosphate is a white crystal, and the product particles can intuitively feel its crystal clearness under light, and there is no quantitative standard to measure it at present
Although the sense of crystallization is very good, the product is not very round, which makes the product easy to agglomerate, and is limited by the specific process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0028] A diammonium phosphate enterprise in Hubei adopts the traditional pre-neutralization-drum ammoniation granulation method for production. The specific process flow is: in the pre-neutralization tank, concentrated phosphoric acid and liquid ammonia are reacted at 120°C to generate a slurry with N / P of 1.5, and the slurry is pumped into the granulator. In the granulator, the slurry reacts further with ammonia to generate DAP with N / P of 1.8-1.9 and moisture content of 3-4%, and then enters the co-current rotary dryer to dry into finished products. Due to the influence of impurities such as magnesium oxide phosphate, the produced diammonium phosphate particles are not round enough, have no luster, low strength, and are easy to agglomerate.

[0029] By adopting the method of the present invention, boric acid with a purity of 0.08% and 95% boric acid accounting for the mass of phosphoric acid in the neutralization tank is added to the phosphoric acid pre-neutralization tank, ...

Embodiment example 2

[0031] A diammonium phosphate enterprise in Gansu adopts the mixed process of pre-neutralization + tubular reactor for production. The specific process is as follows: the concentrated acid in the wet-process phosphoric acid storage tank and the washing solution (N / P is about 0.6) are prepared into a certain concentration of dilute phosphoric acid (N / P≤0.6), and then the prepared dilute phosphoric acid is mixed with the The liquid ammonia in the comprehensive tank area reacts in the pre-neutralization reactor (120°C) + tubular reactor (140°C) to generate diammonium phosphate slurry (N / P is about 1.5), and the slurry is sprayed to the manufacturing plant Shotcrete granulation is carried out in the granulator. In the granulator, the slurry and ammonia are further reacted to generate DAP with an N / P of 1.9, and the material granulated by the granulator enters the dryer to dry the material into a finished product. The tubular reactor can produce 60-70% of the total required ammoni...

Embodiment example 3

[0034] A diammonium phosphate enterprise in Guizhou adopts the mixed process of pre-neutralization + tubular reactor for production. The specific process is as follows: the concentrated acid in the wet-process phosphoric acid storage tank and the washing liquid (N / P is about 0.8) are prepared into a certain concentration of dilute phosphoric acid (N / P≤0.6), and then the prepared dilute phosphoric acid is mixed with the The liquid ammonia in the comprehensive tank area reacts in the pre-neutralization reactor (120°C) + tubular reactor (140°C) to generate diammonium phosphate slurry (N / P is about 1.5), and the slurry is sprayed to the manufacturing plant Shotcrete granulation is carried out in the granulator. In the granulator, the slurry and ammonia are further reacted to generate DAP with an N / P of 1.9, and the material granulated by the granulator enters the dryer to dry the material into a finished product. The tubular reactor can produce 60-70% of the total required ammoni...

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Abstract

The invention discloses a method for improving the surface glass sensation of diammonium phosphate. The method is characterized by comprising the following steps of adding boric acid accounting for 0.05-0.10% by mass of neutralizing tank phosphoric acid in a neutralizing tank and adding a sodium-containing substance accounting for 0.02-0.08% by mass of neutralizating tank slurry in a granulator inthe conventional diammonium phosphate production method through the phosphoric acid. The sodium-containing substance is one or a mixture of two or more of sodium carbonate, sodium hydrogencarbonate and sodium oxide. According to the method, the transparent sensation, the gloss and the strength of diammonium phosphate particles are mainly improved. At the same time, the pH value of the diammoniumphosphate can be adjusted, and the granulation rate of the diammonium phosphate is improved.

Description

technical field [0001] The invention relates to the production field of diammonium phosphate, in particular to the production field of diammonium phosphate granulation. Background technique [0002] With the continuous development of the market, the quality requirements of users for diammonium phosphate products have also been continuously improved. In particular, the requirements for the appearance quality of DAP are very high, and the control of product particle size, roundness, chroma, and crystallization will become the intuitive standard of DAP product quality. [0003] Improving the appearance quality of DAP products is one of the important means to establish product image and user quality. On the premise of ensuring the internal quality, the appearance quality of DAP product particles is usually tested and judged by the following indicators: [0004] 1. Particle size: Use a test sieve with an aperture of 1.00-4.00mm to sieve the sample to calculate its fraction; and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/28C05B7/00
CPCC01B25/28C05B7/00
Inventor 王仁宗杨慧萍田楠李淑华
Owner HUBEI FORBON TECH
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