WO2021103940A1

WO2021103940A1 - Superabsorbent medium trace element mixture and application thereof

Info

Publication number: WO2021103940A1
Application number: PCT/CN2020/125779
Authority: WO
Inventors: 王仁宗
Original assignee: 湖北富邦科技股份有限公司
Priority date: 2019-11-27
Filing date: 2020-11-02
Publication date: 2021-06-03
Also published as: MA56085A1; CN110734337A; MA56085B1

Abstract

The present invention relates to a superabsorbent medium trace element mixture and an application thereof. The superabsorbent medium trace element mixture comprises 50-95% of sulfur, 0.5-20% of a dispersing agent, and 0.1-45% of medium trace elements other than sulfur. A preparation method comprises: adding medium trace elements and a dispersing agent to liquid sulfur, and mixing those well. The preparation method can be applied to the preparation of a granular medium trace element mixture and the coating of granular fertilizers. The present invention has the following advantages: the medium and trace element mixture is uniform, stable, easy to transport and can be customized according to customer requirements, and medium trace elements can be quickly and flexibly added.

Description

A kind of super absorbent medium and trace element mixture and its application

Technical field

The invention relates to the technical field of new type fertilizers, in particular to a super absorbent medium and trace element mixture and its application.

Background technique

China's agriculture has experienced rapid development for many years and has achieved world-renowned achievements. At the same time, the extensive growth model has brought many problems: rapid consumption of resources, serious environmental pollution, and degradation of land resource functions. The utilization rate of high-nutrient quick-acting fertilizers is extremely low, and agricultural non-point source pollution caused by fertilizer loss is very serious. With the reform and improvement of my country’s modern agricultural technology and agricultural production structure, environmentally friendly fertilizers that meet the needs of my country’s agricultural production will become the mainstay of fertilizers in my country, and the development of the fertilizer industry will also move toward higher efficiency of fertilizer nutrients and simplified fertilizer application. The development of fertilizer cost economy, environmental impact ecologicalization, crop nutrient balance and other directions. Balanced fertilization is the key to achieving high-quality agricultural development. In addition to nitrogen, phosphorus, potassium and other elements, the nutrients needed by crops also include medium and trace elements and organic fertilizers. Medium and trace elements have a great impact on the product and quality of crops. influences.

In recent years, there have been more and more researches and applications around middle and trace element fertilizers at home and abroad, which has greatly promoted the progress of the fertilizer industry. The common medium and trace elements are sulfur, calcium, magnesium, silicon, iron, manganese, copper, zinc, boron, molybdenum and other elements. Unlike nitrogen, phosphorus, potassium and other elements, although the medium and trace elements are essential nutrients for crops, their dosage It is generally less, and it is easily fixed by the soil after application and loses its fertilizer effect. In order to solve the problem of fixed trace elements, chelated trace element fertilizers appeared on the market, which can greatly increase the fertilizer utilization rate. However, due to its high cost, its popularization and use are largely affected.

Granular sulfur fertilizer granulation and molten sulfur coating are also restricted due to the dispersion of added trace elements in molten sulfur.

Medium and micronutrient elements play an irreplaceable important role in the growth and development of crops. Therefore, how to realize the addition of medium and micronutrients simply, quickly, efficiently and safely is of great significance. On the basis of conventional fertilizers, maximize the value and use efficiency of medium and micronutrients to achieve the synergy and balance of medium and micronutrients and macronutrients.

Summary of the invention

The purpose of the present invention is to overcome the above-mentioned problems in the prior art and provide a medium and trace element mixture and its application. The present invention can quickly upgrade conventional fertilizers to new fertilizers containing one or more medium and trace elements, or prepare medium and trace elements. Elemental granular fertilizer. The invention quickly and flexibly adds medium and trace elements; solves the problem that the pure medium and trace element granules are difficult to uniformly disperse in the soil and cause crop poisoning; by adding a dispersant, the problem of dispersing medium and trace elements in molten sulfur is accelerated, and The disintegration of the film layer solves the problem that the particle size of the massive sulfur is too large to be absorbed by crops; the medium and trace element film formed by this method is firmly combined with the fertilizer particles and is not easy to fall off.

The surface of the coated fertilizer prepared by this scheme is a layer of trace element film with sulfur as the carrier. The chemical inertness of sulfur makes the coated fertilizer not easy to absorb moisture and agglomerate, so it can reduce or even eliminate the use of fertilizer to prevent agglomeration To reduce the cost of fertilizer production.

The specific implementation of the present invention is as follows:

A super absorbent medium and trace element mixture, which is composed of medium and trace elements and a dispersant. Each component is calculated by weight percentage. It is characterized in that: the sulfur in the mixture accounts for 50%-95%, and the dispersant accounts for 0.5%-20. %, the medium and trace elements other than sulfur account for 0.1%-45%, and the preparation method is as follows: adding medium and trace elements and a dispersant to the liquid sulfur and mixing them uniformly. It can be applied to the preparation of medium and trace element granular fertilizers and fertilizer coating.

The middle and trace elements are one or several mixtures of simple substances, oxides, hydroxides or compounds containing sulfur, calcium, magnesium, silicon, iron, manganese, copper, zinc, boron, and molybdenum.

The dispersant is an inorganic-organic modified water absorbing material, an inorganic water absorbing material, and an inorganic modified water absorbing material.

The inorganic-organic modified water-absorbing material is kaolin-sodium polyacrylate super absorbent composite resin, montmorillonite-polyacrylamide super absorbent composite resin, mica-sodium polyacrylate super absorbent composite resin or sepiolite- Polyacrylic acid super absorbent composite resin.

The said inorganic water-absorbing material is kaolin, montmorillonite, mica and/or sepiolite.

The inorganic modified water-absorbing material is inorganic modified kaolin, inorganic modified montmorillonite, inorganic modified mica, inorganic modified sepiolite or super magnesium carbonate.

An application of a super absorbent medium and trace element mixture is characterized in that the super absorbent medium and trace element mixture is granulated in a steel belt granulator or a high-tower granulation device to obtain a granular trace element mixture.

The superabsorbent medium and trace element mixture is used for the preparation of coated fertilizers. By placing conventional granular fertilizers in a wrapping drum, disc or fluidized bed equipment with heating function, the above medium and trace element mixtures are used to account for the particles. 5-12% of the fertilizer weight is sprayed on the surface of the granular fertilizer heated to a certain temperature and solidified after cooling to form a medium and trace element film on the surface of the fertilizer.

The granular fertilizer is calcium magnesium phosphate fertilizer, compound fertilizer, compound fertilizer, urea, granular potassium sulfate, granular potassium chloride, superphosphate, double superphosphate, monoammonium phosphate, diammonium phosphate or calcium ammonium nitrate.

The stated temperature means that the granular fertilizer needs to be preheated to 70-100°C in the drum, disc or fluidized bed equipment.

The advantages of the present invention are: 1. The medium and trace element mixture is uniform, stable and easy to transport; 2. It can be customized according to customer needs; 3. The medium and trace elements can be added quickly and flexibly. 4. The mixture of trace elements in the granule and the coated fertilizer have good disintegration.

Detailed ways

The present invention will be further described below in conjunction with specific examples, including but not limited to the following cases. The substances in the following examples are calculated by weight percentage, and all raw materials are directly purchased.

Example one

(1) Preparation of a super absorbent medium and trace element mixture, the composition of the mixture is as follows: 95% sulfur, 0.1% zinc oxide and 4.9% kaolin-sodium polyacrylate super absorbent composite resin. The sulfur is heated to a liquid state, and zinc oxide, kaolin-sodium polyacrylate super absorbent composite resin are added to the liquid sulfur and mixed uniformly to prepare a medium and trace element mixture.

(2) Preparation of a new type of fertilizer with trace elements in the package. Add diammonium phosphate (MAP: 10-50-0) in the wrapping drum, preheat to 100℃, add the ratio of the medium and trace element mixture: 1 ton of monoammonium phosphate wraps 100kg of the medium and trace element mixture, and the coated granular fertilizer Pack after cooling.

(3) The final nutrient content of the new medium-trace element fertilizer prepared is as follows:

To	NN	P ₂O ₅ P ₂ O ₅	单质SElemental S	水难溶ZnInsoluble Zn
养分组成Nutrient composition	9.1％9.1%	45.4％45.4%	8.6％8.6%	0.007％0.007%

The coated fertilizer coated with the medium and trace element mixture does not require additional anti-caking agents, moisture-proof agents, and anti-whitening agents to have anti-caking, moisture-proof and anti-whitening effects, and the coating layer does not affect the nutrients of the coated fertilizer Normal release.

Example two

(1) Preparation of a super absorbent medium and trace element mixture, the composition of the mixture is as follows: 50% sulfur, 45% magnesium oxide and 5% montmorillonite. The sulfur is heated to a liquid state, and magnesium oxide and montmorillonite are added to the liquid sulfur and mixed uniformly to prepare a medium and trace element mixture.

(2) Prepare the microelement mixture in the granules, and granulate the medium and microelement mixture through a steel belt granulator to prepare the microelement mixture in the granules.

(3) The nutrients of the trace element mixture in the final prepared particles are as follows:

To	单质SElemental S	水难溶MgInsoluble in water Mg
养分组成Nutrient composition	50％50%	23％twenty three%

Example three

(1) Preparation of super absorbent medium and trace element mixture. The composition of the mixture is as follows: 70% sulfur, 10% iron trioxide, 15% inorganic modified mica and 5% inorganic modified sepiolite. The sulfur is heated to a liquid state, and ferric oxide, inorganic modified mica and inorganic modified sepiolite are added to the liquid sulfur and mixed uniformly to prepare a medium and trace element mixture.

(2) Preparation of a new type of fertilizer with trace elements in the package. Add granular calcium magnesium phosphate fertilizer into the wrapping drum and preheat it to 80°C. Addition ratio of medium and trace element mixture: 1 ton of granular calcium magnesium phosphate fertilizer is wrapped with 100 kg of medium and trace element mixture, and the wrapped granular fertilizer is cooled and then packaged.

To	P ₂O ₅ P ₂ O ₅	CaCa	MgMg	SiSi	单质SElemental S	水难溶FeInsoluble Fe
养分组成Nutrient composition	9.8％9.8%	26.3％26.3%	5.9％5.9%	7.6％7.6%	6.3％6.3%	0.6％0.6%

Example four

(1) Preparation of super absorbent medium and trace element mixture. The composition of the mixture is as follows: 80% sulfur, 19.5% magnesium hydroxide and 0.5% super magnesium carbonate. The sulfur is heated to a liquid state, and magnesium hydroxide and super magnesium carbonate are added to the liquid sulfur and mixed uniformly to prepare a medium and trace element mixture.

(2) Preparation of a new type of fertilizer with trace elements in the package. Add compound fertilizer (15-15-15) in the wrapping drum and preheat to 70℃. Addition ratio of medium and trace element mixture: 1 ton of compound fertilizer wraps 120kg of medium and trace element mixture, and the wrapped granular fertilizer is cooled and then packaged.

To	NN	P ₂O ₅ P ₂ O ₅	K ₂O K ₂ O	单质SElemental S	MgMg
养分组成Nutrient composition	13.4％13.4%	13.4％13.4%	13.4％13.4%	8.5％8.5%	0.86％0.86%

Claims

A super absorbent medium and trace element mixture, which is composed of medium and trace elements and a dispersant. Each component is calculated by weight percentage. It is characterized in that: the sulfur in the mixture accounts for 50%-95%, and the dispersant accounts for 0.5%-20. %, the medium and trace elements other than sulfur account for 0.1%-45%, and the preparation method is as follows: adding medium and trace elements and a dispersant to the liquid sulfur and mixing them uniformly.
The superabsorbent medium and trace element mixture according to claim 1, wherein the medium and trace elements are simple substances containing sulfur, calcium, magnesium, silicon, iron, manganese, copper, zinc, boron, and molybdenum. One or a mixture of oxides, hydroxides or compounds.
8. The super absorbent medium and trace element mixture of claim 1, wherein the dispersant is an inorganic-organic modified water absorbing material, an inorganic water absorbing material, and an inorganic modified water absorbing material.
The super absorbent medium and trace element mixture of claim 3, wherein the inorganic-organic modified water absorbent material is kaolin-sodium polyacrylate super absorbent composite resin, montmorillonite-polyacrylamide high Water-absorbent composite resin, mica-sodium polyacrylate super-absorbent composite resin or sepiolite-polyacrylic acid super-absorbent composite resin.
The superabsorbent medium-trace element mixture according to claim 3, wherein the inorganic water-absorbing material is kaolin, montmorillonite, mica or sepiolite.
The super absorbent medium and trace element mixture of claim 3, wherein the inorganic modified water-absorbing material is inorganic modified kaolin, inorganic modified montmorillonite, inorganic modified mica, inorganic modified sea Foam and/or Super Magnesium Carbonate.
The application of a super absorbent medium and trace element mixture according to claim 1, characterized in that: the super absorbent medium and trace element mixture is granulated in a steel belt granulator or a high tower granulation equipment Mixture of trace elements in particles.
The application of a superabsorbent medium and trace element mixture according to any one of claims 1 to 6, characterized in that: the superabsorbent medium and trace element mixture is used for the preparation of coated fertilizers by using conventional granular fertilizers. Placed in a wrapping drum, disc or fluidized bed equipment with heating function, spray the medium and trace element mixture accounting for 5-12% of the weight of the granular fertilizer on the surface of the granular fertilizer heated to a certain temperature, and solidify after cooling. A film of medium and trace elements is formed on the surface of the fertilizer.
The application of a super absorbent medium and trace element mixture according to claim 8, wherein the granular fertilizer is calcium magnesium phosphate fertilizer, compound fertilizer, compound fertilizer, urea, granular potassium sulfate, granular potassium chloride , Superphosphate, Superphosphate, Monoammonium Phosphate, Diammonium Phosphate or Calcium Ammonium Nitrate.
The application of a super absorbent medium and trace element mixture according to claim 8, characterized in that: the certain temperature means that the granular fertilizer needs to be preheated to 70-70 in the drum, disc or fluidized bed equipment. 100°C.