Method for improving glass feeling of surface of diammonium phosphate

A diammonium phosphate and surface glass technology, which is applied in ammonium orthophosphate fertilizers, alkaline orthophosphate fertilizers, phosphate fertilizers, etc., can solve the problems of not too round products, limited process flow, and easy agglomeration of products, so as to achieve improvement Crop quality, glassy strong, obvious glassy effects

Inactive Publication Date: 2019-01-29
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] Adopt the method of the present invention, add 0.06% purity 99.8% boric acid accounting for the phosphoric acid weight of the neutralization tank in the phosphoric acid pre-neutralization tank, carry out reaction and generate N / P ...

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 glass feeling of the surface of diammonium phosphate. The method comprises the following steps that in a conventional method for producing diammonium phosphate by using phosphoric acid, boric acid which accounts for 0.05-0.20% by mass of the phosphoric acid in a neutralization tank is added into the neutralization tank, wherein the boric acid is a weak acid. The method disclosed by the invention is mainly used for improving performance such as transparency, luster, strength and the like of diammonium phosphate particles, and meanwhile, diammoniumphosphate can contain boron microelements, has fertilizer efficiency to many crops, can improve the crop quality and increase the yield, and also has insecticidal and catalyst effects.

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): C05G3/02C05G3/00C05G3/60
CPCC05B7/00C05G3/00C05G3/60C05C3/00C05D9/02
Inventor 王仁宗杨慧萍田楠李淑华
Owner HUBEI FORBON TECH
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