Method for producing full-water-soluble flaky magnesium nitrate through steel belt granulator

A technology of magnesium nitrate and granulator, applied in directions such as magnesium nitrate, can solve problems such as poor water solubility, easy agglomeration and purity of magnesium nitrate, achieve the effects of improving water solubility and content, facilitating storage and transportation, and solving poor water solubility

Active Publication Date: 2014-10-15
SHANXI JIAOCHENG HONGXING CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the technical problems of poor water solubility, easy agglomeration and low purity of current magnesium nitrate p

Method used

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  • Method for producing full-water-soluble flaky magnesium nitrate through steel belt granulator
  • Method for producing full-water-soluble flaky magnesium nitrate through steel belt granulator
  • Method for producing full-water-soluble flaky magnesium nitrate through steel belt granulator

Examples

Experimental program
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Effect test

Embodiment 1

[0012] Example 1 A method for producing fully water-soluble flaky magnesium 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, and nitric acid solution The concentration is 40%, the temperature is controlled at 80°C and the reaction is stirred for 1.5 hours, and then the pH of the reaction solution is adjusted to 6.5 with magnesium oxide; (b) The obtained magnesium nitrate neutralization solution is 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) Pump the concentrated magnesium nitrate solution into the cooling crystallization tank, add dilute nitric acid with a concentration of 42% to adjust the pH of the solution to 3, stir and cool, and white magnesium nitrate crystals ...

Embodiment 2

[0015] Example 2 A method for producing fully water-soluble flaky magnesium 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, and nitric acid solution The concentration is 42%, the temperature is controlled at 78°C and the reaction is stirred for 2.0 hours, and then the pH of the reaction solution is adjusted to 7.0 with magnesium oxide; (b) The magnesium nitrate neutralization solution obtained is filtered by 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) Pump the concentrated magnesium nitrate solution into the cooling crystallization tank, add dilute nitric acid with a concentration of 40% to adjust the pH of the solution to 3.5, stir and cool, when the circulating water cools down...

Embodiment 3

[0018] Example 3 A method for producing fully water-soluble flake-shaped magnesium 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, and nitric acid solution The concentration is 41%, the temperature is controlled at 70°C and the reaction is stirred for 2.5 hours, and then the pH of the reaction solution is adjusted to 7.5 with magnesium oxide; (b) The magnesium nitrate neutralization solution obtained is 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 1.320g / cm 3 (d) Pump the concentrated magnesium nitrate solution into the cooling crystallization tank, add dilute nitric acid with a concentration of 38% to adjust the pH of the solution to 5, stir and cool, and white magnesium nitrate cr...

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Abstract

The invention relates to a production technology of magnesium nitrate in the fertilizer field, particularly to a method for producing full-water-soluble flaky magnesium nitrate through a steel belt granulator, and solves the technical problems that magnesium nitrate products are poor in water solubility, can cake easily and are lower in purity at present. The method comprises the steps as follows: (a) adding magnesium oxide and a dilute nitric acid into a reaction kettle for a neutralization reaction; (b) filtering an obtained magnesium nitrate neutralization solution; (c) pumping a filtrate into an evaporator for evaporation concentration; (d) pumping the concentrated magnesium nitrate solution into a cooling crystallization kettle; (e) leading magnesium nitrate crystals and mother liquor into a centrifuge for separation operation to obtain white needle-like magnesium nitrate crystals; (f) introducing the white magnesium nitrate crystals into a dissolving tank for concentration; (g) enabling a concentrated solution to enter the steel belt granulator to generate a round flaky magnesium nitrate product. The problems that the magnesium nitrate products are poor in water solubility, are lower in purity, can cake easily and the like in the prior art are fundamentally solved with the method.

Description

technical field [0001] The invention relates to a production process of magnesium nitrate in the field of chemical fertilizers, in particular to a method for producing fully water-soluble flake magnesium 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 on spraying equipment; at the same time, because there are a large number of free water molecules on the surface of crystals (or particles) , which makes the product prone to agglomeration in packaging and transportation, which is not conducive to long-distance transportation an...

Claims

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Application Information

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