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A kind of double-layer magnesium sulfate slow-release fertilizer and preparation method thereof

A slow-release fertilizer and magnesium sulfate technology, which is applied in the direction of layered/coated fertilizers, magnesium fertilizers, inorganic fertilizers, etc., can solve the problems of inability to provide magnesium nutrients, controlled release of fertilizers in stages, and insufficient supply of effective nutrients, etc., to achieve Conducive to crop absorption, balanced and reasonable nutrient release, moderate intensity effect

Active Publication Date: 2021-01-15
营口菱镁化工集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the main magnesium fertilizer products used in China mainly include: (1) Magnesium sulfate monohydrate, which is white and small oblique or oblique columnar crystals. It is the most commonly used magnesium fertilizer in China. High solubility, easy loss, and low utilization rate of magnesium. This kind of granular magnesium fertilizer cannot continuously provide magnesium nutrients to the soil and crops in the early, middle and late stages of crop growth. It is prone to insufficient effective nutrient supply for crops with a growth period of more than 60 days. question
(2) Magnesium hydroxide (also known as brucite), white amorphous powder, containing magnesium as citrate-soluble magnesium oxide, hardly soluble in water, easily soluble in dilute acid and ammonium salt solution, and has a very high utilization rate by crops in soil Low
(3) Granular magnesium fertilizer, using magnesium sulfate monohydrate and magnesium hydroxide for granulation, the prepared granular magnesium fertilizer can partially alleviate the problems of absorption and leaching, but it is still a kind of soluble and difficult to dissolve in essence. The mixture of magnesium-soluble compounds cannot achieve multi-effect slow release and achieve the goal of synchronizing with the absorption of magnesium by crops
Existing controlled-release fertilizers can only achieve one slow-release cycle, and cannot control the release of fertilizers in stages according to different stages of crop growth

Method used

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  • A kind of double-layer magnesium sulfate slow-release fertilizer and preparation method thereof
  • A kind of double-layer magnesium sulfate slow-release fertilizer and preparation method thereof
  • A kind of double-layer magnesium sulfate slow-release fertilizer and preparation method thereof

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specific Embodiment 1

[0047] A preparation method of double-layer magnesium sulfate slow-release fertilizer, comprising the following steps:

[0048] 1) Preparation of fertilizer core particles:

[0049] 101) Preparation of adhesive: Add powdered light-burned magnesia and sulfuric acid into a reaction tank containing an appropriate amount of water according to the mass ratio of 1:2.5, stir and react at 100°C for 0.5h to obtain a solution with a pH of 6.5 and a mass concentration of 30%. Magnesium sulfate solution; the concentration of sulfuric acid is 98%.

[0050] 102) Granulation: Put 85 parts of powdery magnesium sulfate monohydrate into the granulator, then add 10 parts of the magnesium sulfate solution in step 101), and granulate at 60°C to obtain granular materials;

[0051] 103) Drying: put the granular material obtained in step 102) into a rotary drum dryer, and dry continuously at 120° C. for 15 minutes to obtain a dried material;

[0052] 104) Cooling: put the material obtained in step ...

specific Embodiment 2

[0076] A preparation method of double-layer magnesium sulfate slow-release fertilizer, comprising the following steps:

[0077] 1) Preparation of fertilizer core particles:

[0078] 101) Preparation of adhesive: Add powdered light-burned magnesia and sulfuric acid into a reaction tank containing an appropriate amount of water according to the mass ratio of 1:2.5, stir and react at 100°C for 0.5h to obtain a solution with a pH of 6.5 and a mass concentration of 30%. Magnesium sulfate solution; the concentration of sulfuric acid is 98%.

[0079] 102) Granulation: put 90 parts of powdery magnesium sulfate monohydrate into a granulator, then add 15 parts of the magnesium sulfate solution in step (2), and granulate at 80° C. to obtain granular materials;

[0080] 103) Drying: put the granular material obtained in step 102) into a rotary drum dryer, and dry continuously at 320° C. for 8 minutes to obtain a dried material;

[0081] 104) Cooling: put the material obtained in step 10...

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Abstract

The invention relates to a double-layer magnesium sulfate slow-release fertilizer which is prepared from the following ingredients in parts by weight: 70 to 80 parts of fertilizer core particles, 20 to 35 parts of first layer wrapping material and 1 to 5 parts of second layer coating material, wherein the first layer wrapping material and the second layer coating material are arranged from insideto outside; a fertilizer core is the fertilizer core particles prepared from magnesium sulfate monohydrate; the first layer wrapping material is prepared from 15 to 25 parts of light calcined magnesia, 5 to 10 parts of magnesite and the defined amount of adhesive; the second layer coating material is prepared from the ingredients in parts by weight: 40 to 50 parts of phosphorized graft modified epoxy polymer emulsion, 2 to 4 parts of diethylene triamine and 0.1 to 0.2 part of N,N'-methylene bisacrylamide. According to the particle fertilizer, the first layer wrapping material which is preparedfrom the light calcined magnesia and magnesite which have slow release property and the second layer coating material can jointly ensure that water-soluble magnesium sulfate serving as the fertilizercore has good slow release property; meanwhile, the fertilizer contains three magnesium forms of water-solution magnesium, critric-acid-soluble magnesium and insoluble magnesium, nutrient release isbalanced and reasonable, and the nutrients are more favorable for being absorbed by crops.

Description

technical field [0001] The invention belongs to the field of agricultural fertilizers, and relates to a novel medium and trace element fertilizer, in particular to a double-layer magnesium sulfate slow-release fertilizer and a preparation method thereof. Background technique [0002] Magnesium is an essential nutrient element for plant growth. Magnesium is an important core element in the composition of chlorophyll in plants and plays an important role in chlorophyll synthesis and photosynthesis. Magnesium participates in the assimilation of carbon dioxide in chloroplasts, which is beneficial to the synthesis of sugar and starch; magnesium also participates in the synthesis of sugar, protein and fat. Magnesium can promote the synthesis of vitamin A and vitamin C, and participate in the synthesis reaction of fatty acids, thereby increasing the oil content of oil crop seeds. Magnesium can promote the balanced absorption of other nutrients by plant roots. Sufficient magnesium ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F251/02C05G5/30C05G3/40C05G5/12C08F220/14C08F220/10C08F220/18
CPCC05D5/00C05G3/00C08F251/02C05G5/12C05G5/30C08F220/10
Inventor 杨云洪车太龙李长龙张荣阳王新沈洁
Owner 营口菱镁化工集团有限公司