Method for producing full-water-soluble magnesium ammonium nitrate by using steel belt granulator

A technology of ammonium magnesium nitrate and granulator, applied in the direction of magnesium nitrate, etc., can solve the problems of the purity of magnesium nitrate products that are easy to agglomerate, and achieve the effects of improving water solubility and content, improving poor water solubility, and enhancing strength

Active Publication Date: 2014-10-08
SHANXI JIAOCHENG HONGXING CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention provides a method for producing fully water-soluble magnesium ammonium nitrate using a steel belt granula...

Method used

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  • Method for producing full-water-soluble magnesium ammonium nitrate by using steel belt granulator
  • Method for producing full-water-soluble magnesium ammonium nitrate by using steel belt granulator
  • Method for producing full-water-soluble magnesium ammonium nitrate by using steel belt granulator

Examples

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Embodiment 1

[0014] Example 1 A method for producing fully water-soluble magnesium ammonium nitrate using a steel belt granulator, comprising the following steps: (a) adding magnesium oxide and nitric acid to the reaction kettle at a molar ratio of 1:2 for neutralization reaction, the concentration of the nitric acid solution 40%, the temperature was controlled at 72°C and the reaction was stirred for 1.5 hours, and then the pH of the reaction solution was adjusted to 6.5 with magnesium oxide; (b) The magnesium nitrate neutralization solution obtained was filtered into a plate and frame filter press to obtain a transparent filtrate; (c ) pump the filtrate into the primary evaporator for evaporation and concentration, and evaporate to a specific gravity of 1.300g / cm 3 (d) adding ammonium nitrate solution to the concentrated magnesium nitrate solution, the ammonium nitrate solution accounts for 4.5% of the concentrated magnesium nitrate solution quality, and the concentration of the ammonium ...

Embodiment 2

[0017] Example 2 A method for producing fully water-soluble magnesium ammonium nitrate using a steel belt granulator, comprising the following steps: (a) adding magnesium oxide and nitric acid to the reaction kettle at a molar ratio of 1:2 for neutralization reaction, the concentration of the nitric acid solution 41%, the temperature was controlled at 76°C and the reaction was stirred for 1.7 hours, and then the pH of the reaction solution was adjusted to 7.0 with magnesium oxide; (b) The magnesium nitrate neutralization solution obtained was filtered into a plate and frame filter press to obtain a transparent filtrate; (c ) pump the filtrate into the primary evaporator for evaporation and concentration, and evaporate to a specific gravity of 1.080g / cm 3 (d) adding ammonium nitrate solution to the concentrated magnesium nitrate solution, the ammonium nitrate solution accounts for 5.5% of the concentrated magnesium nitrate solution quality, and the concentration of the ammonium ...

Embodiment 3

[0020] Example 3 A method for producing fully water-soluble magnesium ammonium nitrate using a steel belt granulator, comprising the following steps: (a) adding magnesium oxide and nitric acid to the reactor at a molar ratio of 1:2 for neutralization reaction, the concentration of the nitric acid solution 39%, the temperature was controlled at 78°C and the reaction was stirred for 1.6 hours, and then the pH of the reaction solution was adjusted to 7.5 with magnesium oxide; (b) The magnesium nitrate neutralization solution obtained was filtered into a plate and frame filter press to obtain a transparent filtrate; (c ) pump the filtrate into the primary evaporator for evaporation and concentration, and evaporate to a specific gravity of 1.200g / cm 3 (d) adding ammonium nitrate solution to the concentrated magnesium nitrate solution, the ammonium nitrate solution accounts for 3.5% of the concentrated magnesium nitrate solution quality, and the concentration of the ammonium nitrate ...

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Abstract

The invention relates to a production process of magnesium ammonium nitrate in the field of chemical fertilizers, and in particular relates to a method for producing full-water-soluble magnesium ammonium nitrate by using a steel belt granulator. By adopting the method, the technical problems that magnesium nitrate used for a fertilizer is easy to agglomerate and is relatively low in product purity at present can be solved. The method for producing full-water-soluble magnesium ammonium nitrate by using the steel belt granulator comprises the following steps: (a), adding magnesium oxide and dilute nitric acid into a reaction kettle to perform neutralization reaction, and then regulating the pH value of reaction liquid to be 6.5-7.5 by using magnesium oxide; (b) feeding an obtained magnesium nitrate neutralization solution to a plate-frame filter for filtration; (c) pumping filtrate into a primary evaporator to be subjected to evaporation concentration; (d) adding an ammonium nitrate solution into a concentrated magnesium nitrate solution, uniformly stirring, and then performing secondary evaporation concentration; and (e) enabling a concentrated solution to enter the steel belt granulator, and performing granulation by using the steel belt granulator to generate a circular flaky magnesium ammonium nitrate finished product. By regulating production equipment and processes, the method disclosed by the invention can achieve that the product cannot be influenced by natural conditions, and the water solubility and content are significantly improved.

Description

technical field [0001] The invention relates to a production process of magnesium ammonium nitrate in the field of chemical fertilizers, in particular to a method for producing fully water-soluble magnesium ammonium nitrate by using a steel belt granulator. Background technique [0002] Magnesium nitrate hexahydrate crystals (or granules) used in the fertilizer industry produced by the prior art require the product to have a pH range of 6 to 7 in order to prevent soil acidification, but under this pH condition, when the product is dissolved in water, it will appear Visible white flocculent water-insoluble substances are prone to spray blockage during spraying, which greatly limits the application of this product in spraying facilities; at the same time, due to the large amount of free water molecules on the surface of crystals (or particles) Existence, which makes the product prone to agglomeration in packaging and transportation, which is not conducive to long-distance tran...

Claims

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Application Information

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IPC IPC(8): C05C13/00C01F5/38
Inventor 路永宽
Owner SHANXI JIAOCHENG HONGXING CHEM
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