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Ammonium magnesium phosphate particle not stratified when mixed and disintegrating in water and preparation method of ammonium magnesium phosphate particle

A technology of magnesium ammonium phosphate and magnesium ammonium phosphate powder, which is used in ammonium orthophosphate fertilizer, phosphate fertilizer granulation/granulation, ammonium nitrate fertilizer, etc. question

Inactive Publication Date: 2019-10-25
山东和生海洋科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0018] (1) The layering problem caused by the uneven size and density of BB fertilizer particles mixed with magnesium ammonium phosphate particles;
[0019] (2) Magnesium ammonium phosphate particles are too stable to disintegrate and fully mix with the soil in the wet environment of the soil

Method used

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  • Ammonium magnesium phosphate particle not stratified when mixed and disintegrating in water and preparation method of ammonium magnesium phosphate particle
  • Ammonium magnesium phosphate particle not stratified when mixed and disintegrating in water and preparation method of ammonium magnesium phosphate particle

Examples

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Effect test

Embodiment 1

[0052] The preparation method of the mixed magnesium ammonium phosphate particles that are not layered and meet water disintegration of the present embodiment may further comprise the steps:

[0053] (1) The magnesium ammonium phosphate powder is dried and passed through a 32-mesh sieve, containing 1.5% of free water; in the magnesium ammonium phosphate powder, a disintegrating agent, a dispersant, a binding agent, and a desiccant auxiliary are added (the auxiliary agent is Cross 32 mesh sieves), stir and mix evenly to obtain the mixture, the specific formula of fertilizer: magnesium ammonium phosphate 95%, polyvinyl alcohol 17-88 3%, potassium sulfate 1%, bentonite 1%;

[0054] (2) Primary granulation: start the double-roll extrusion granulator (rated compression ratio 2.5), put 10kg of the mixture prepared in step (1) into the hopper of the double-roll extrusion granulator, and squeeze it into slice, crush, and sieve to obtain irregular particles of 1.5mm-3.5mm (bulk density...

Embodiment 2

[0059] The preparation method of this example is basically the same as that of Example 1, except that the feeding ratio of the secondary granulation is adjusted to 1:1, that is, 10kg of irregular particles and 10kg of mixture.

[0060] Qualified nearly spherical magnesium ammonium phosphate particles have a bulk density of 0.63g / cm 3 , Disintegrate completely within 10 minutes in water.

[0061] It can be seen that the present example increases the content of the mixture during the secondary granulation, resulting in too little bulk density of the magnesium ammonium phosphate particles, so the ratio of the mixture should be reduced during the secondary granulation, thereby increasing the bulk density.

Embodiment 3

[0063] The preparation method of the present embodiment is basically the same as that of Example 1, except that the fertilizer formula is adjusted in step (1): 95% magnesium ammonium phosphate (containing free water 3%), polyvinyl alcohol 17-88 1%, urea 2%, Bentonite 2%.

[0064] One-time granulation to obtain 1.5mm-3.5mm irregular particles with a bulk density of 0.84g / cm 3 , the qualified particle granulation rate of one operation cycle of secondary granulation is 83.5%.

[0065] Qualified nearly spherical magnesium ammonium phosphate particles have a packing density of 0.73g / cm 3 , put into water and disintegrate within 60 minutes, because the content of the disintegrating agent is reduced in this embodiment, which affects the disintegration effect of the granules, so the disintegration speed is obviously prolonged.

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Abstract

The invention discloses an ammonium magnesium phosphate particle not stratified when mixed and disintegrating in water and a preparation method of the ammonium magnesium phosphate particle, and belongs to the technical field of fertilizer manufacturing. According to the technical solution, the ammonium magnesium phosphate particleis prepared from the components: 90%-98% of ammonium magnesium phosphate, 1%-3% of a disintegrating agent, 1%-2% of a dispersant, 0%-2% of an adhesive and 0%-3% of a desiccant; and the stacking density of a particle is adjusted by granulation twice to obtain the2.0mm-4.0mm nearly spherical particle with the stacking density of 0.70g / cm<3>-0.75g / cm<3>,and thus the ammonium magnesium phosphate particle not stratified when mixed and disintegrating in water is obtained. According to the preparation method, by adding an auxiliary material into the ammonium magnesium phosphate and granulating twice,after mixing,no stratification of urea with the stacking density of0.72g / cm<3>-0.73g / cm<3>in a BB fertilizer is achieved, and the problem that ammonium magnesium phosphate particle cannot disintegrate and fully mix with soil in the moist environment is solved.

Description

technical field [0001] The invention relates to a formula and a production process of agricultural fertilizer granules, which belong to the field of fertilizer manufacturing technology, and in particular to magnesium ammonium phosphate granules which are blended without delamination and can be disintegrated when meeting water, and a preparation method thereof. Background technique [0002] Ammonium magnesium phosphate, usually white powder, molecular formula: MgNH 4 PO 4 ·6H 2 O, also called magnesium ammonium phosphate hexahydrate, commonly known as struvite. [0003] Magnesium ammonium phosphate molecular weight: 245.41, relative density 1.711, CAS: 13478-16-5; slightly soluble in cold water, soluble in hot water and dilute acid, insoluble in ethanol, decomposed in alkaline solution, dehydrated into anhydrous at 100°C, melted When decomposed into magnesium pyrophosphate. Magnesium ammonium phosphate is only slightly soluble in water and in wet soil environment, and its...

Claims

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Application Information

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IPC IPC(8): C05B17/00C05B19/00C05G3/00
CPCC05B17/00C05B19/00C05G3/00C05B7/00C05D3/00C05C1/00C05D9/00
Inventor 司志华郭强郭兴
Owner 山东和生海洋科技有限公司
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