WO2017206743A1

WO2017206743A1 - Method for rapid manufacturing of novel micronutrient-containing urea

Info

Publication number: WO2017206743A1
Application number: PCT/CN2017/085266
Authority: WO
Inventors: 操素芬; 王仁宗; 刘裕
Original assignee: 湖北富邦科技股份有限公司
Priority date: 2016-05-31
Filing date: 2017-05-22
Publication date: 2017-12-07
Also published as: MA42875B1; MA42875A1; CN106045792A

Abstract

A method for rapid manufacturing of micronutrient-containing urea, characterized in that the method is implemented according to the following steps: (1). spraying, at a front portion of a coating roller, and on urea at a temperature of 30-80°C, a layer of a coating material pre-heated to 40-70°C, wherein the coating material is a mixture comprising 40% rosin, 30% wax oil, and 30% fatty acid; (2). spraying, at an end of a coating roller, and on the urea, a layer of a nutrient powder comprising a large amount of a micronutrient to manufacture the micronutrient-containing urea. The micronutrient in the urea can be better and more rapidly absorbed by a crop. The urea manufactured using this method does not cake easily. The method is simple and fast, generates no return product, and is flexible and highly efficient.

Description

Method for rapidly preparing novel urea containing medium and trace elements

Technical field

The invention relates to a method for rapidly preparing novel urea containing medium and trace elements, and belongs to the technical field of fertilizers.

Background technique

China is a big agricultural country, and various fertilizers, especially fertilizers, play an indelible contribution to China's food security.

In the past 20 years, China's grain production has increased year by year, but the quality of agricultural products has been declining year by year, and the growth rate of total grain output has declined significantly in the past five years. The reason is that China's agricultural experts, fertilizer experts, planting experts, and soil experts agree that the cause The increase in agricultural product output and the decline in grain quality are due to the imbalance of soil nutrients. At present, agriculture relies too much on a large amount of elements such as nitrogen, phosphorus and potassium. However, the synergistic effect of medium and trace elements on a large number of elements and the metabolism of crops are neglected. enhancement. Therefore, China's soil and crops urgently need to supplement medium and trace elements, and need new fertilizers such as compound fertilizers containing medium and trace elements or single fertilizers (urea, phosphate fertilizer, potash fertilizer).

The demand for food has driven the explosive growth of China's chemical fertilizers. Over the past decade, there have been more than 6,000 types of chemical fertilizer companies in China. However, most of the products are traditional nitrogen, phosphorus and potassium fertilizers or compound fertilizers. China's fertilizer market homogenization competition, price wars, more than 500 large and small fertilizer companies that have closed down in only 2 years, some large-scale urea enterprises are also seriously declining, on the verge of bankruptcy.

Urea is a high-content nitrogen fertilizer, but the utilization rate is only about 30%. It is urgent to cooperate with other medium and trace elements to improve the nutritional efficiency of urea.

The way of adding trace elements is generally directly mixed with the fertilizer granules and added to the inside of the fertilizer granules. For urea, there is no obvious chemical reaction, which causes the medium and trace elements to become precipitates and a large number of failures. However, the pH value of urea is weakly alkaline, and the medium and trace elements are especially metal salts. The suitable pH is about 4.5. Therefore, the urea system is not conducive to the action of trace elements, that is, the addition of medium and trace elements in urea to prepare medium and trace element urea. This method is not advisable. In addition, after the addition of medium and trace elements in urea, for example, after adding zinc sulfate, the granulation of the urea granules is deteriorated, the pores of the fertilizer become large, and the fertilizer is agglomerated severely.

Therefore, the upgrade of China's urea is not only the upgrading of nutrient data, but also the rapid upgrade of equipment renovation. What is needed is the effective upgrade of nutrients and smart upgrade.

In summary, in China, whether it is the demand for trace elements in crops, the imbalance of nutrients in the soil, or the homogenization of urea enterprises, the benefits of enterprises are poor, and there is an urgent need for rapid upgrading to achieve product differentiation. The premise of manufacturing and equipment investment is to realize the rapid and efficient upgrading and transformation of urea.

Therefore, in this context, a rapid preparation of urea to upgrade to a new type of urea rich in medium and trace elements has become a top priority.

Summary of the invention

The object of the present invention is to provide a method for rapidly preparing a novel urea containing medium and trace elements, which can produce a medium and trace element in a novel urea which can function better, is rapidly absorbed by a crop, and a novel method is prepared by the method. Urea does not agglomerate.

The technical solution of the present invention is:

A method for rapidly preparing novel urea containing medium and trace elements, which is characterized by the following steps:

(1) Spray a layer of coating material preheated at 40 ° C to 70 ° C on the urea at a temperature of 30 ° C to 80 ° C at the front end of the coating drum. The coating material is 40% rosin + 30% wax oil + 30 % fatty acid mixture.

(2) At the end of the coating drum, a layer of nutrient powder rich in medium and trace elements is sprayed on the urea to prepare a new type of urea containing medium and trace elements.

The preparation method of nutrient powder rich in medium and trace elements is:

a) nutrient design of nutrient powder: refer to crop demand and soil nutrient data for medium and trace element collocation, and mix to obtain powder 1;

b) Adhesive powder adhesion design: sodium lignin sulfonate or potassium lignosulfonate and the powder 1 obtained in the above step a) is mixed to obtain a powder 2;

c) Anti-caking effect design of the nutritional powder: the powder 2 prepared in the above step b) is uniformly mixed with the modifier which accounts for 0.1-20% of the total amount of the nutritional powder, and the modifier is stearic acid or paraffin , one or more mixtures of mineral oil and vegetable oil, sent to a micro-powder vortex machine for grinding and modification, until the powder mesh reaches 200-1000 mesh, that is, the final enrichment for coating urea A nutrient powder of medium and trace elements.

The urea is urea prepared by a high tower, or urea prepared by a drum apparatus, or urea prepared by fluidized bed granulation, or urea prepared by extrusion.

The medium element material is calcium sulfate, calcium nitrate, potassium sulfate, ammonium sulfate, magnesium sulfate, calcium chloride, magnesium chloride, magnesium oxide, sulfur or a mixture of two or more;

The trace element material is zinc sulfate, copper sulfate, iron sulfate, manganese sulfate, molybdenum sulfate, zinc nitrate, nitrate Acid copper, iron nitrate, manganese nitrate, molybdenum nitrate, sodium borate, potassium borate, sodium tetraborate, boric acid, sodium chloride, potassium chloride, ammonium chloride, zinc oxide, copper oxide, ferric oxide, tetraoxide Iron, manganese oxide, molybdenum oxide single substance or a mixture of two or more.

The advantages of the invention are:

1. Simple and fast, the traditional urea can be upgraded by spraying in the existing fertilizer wrapping drum;

2, no return material. After the package is completed, directly enter the packaging and storage system;

3. Flexible. It can prepare various kinds of medium and trace element fertilizers with different contents, and only need to adjust the amount of package to prepare medium and trace element fertilizers with different gradients and different nutrient distribution ratios;

4, also has anti-knot function. It is no longer necessary to add fertilizer anti-caking agent after using this product;

5, efficient. The unique nutrient isolation technology avoids the reaction between the trace elements and the coated fertilizer or the solubility of the coated fertilizer itself on the solubility of medium and trace elements, so that the nutrients play a better role.

detailed description

The invention is further described in connection with the embodiments. The amount of each substance of the present invention is in percentage by weight.

Implementation case 1

Rotary urea + 0.5% zinc sulfate + 0.5% zinc oxide + 0.5% magnesium oxide

Nutritional powder formula: 32% zinc sulfate + 32% zinc oxide + 32% magnesium oxide + 4% stearic acid for grinding modification, to a powder mesh of 600 mesh.

1) At the front end of the coated drum, spray 1.5 kg of pre-heated 60 °C coating material on a 1 ton temperature 60 °C urea granule. The coating material is 40% rosin + 30% wax oil + 30% fatty acid mixture. .

2) Spraying 15.6 kg of the prepared nutrient powder rich in medium and trace elements in the back end of the coating drum to obtain a new type of urea rich in medium and trace elements.

Implementation case 2

High tower urea + 0.5% copper sulfate + 0.5% zinc oxide + 0.5% magnesium oxide

Nutritional powder formula: 32% copper sulfate + 32% zinc oxide + 32% magnesium oxide + 2% stearic acid + 2% paraffin wax for grinding modification, to a powder mesh of 600 mesh.

1) At the front end of the coated drum, spray 1.5 kg of pre-heated 50 ° C coating material on a 1 ton temperature 50 ° C urea granule. The formula is 40% rosin + 30% wax oil + 30% fatty acid mixture.

Claims

A method for rapidly preparing novel urea containing medium and trace elements, which is characterized by the following steps:

(1) Spray a layer of coating material preheated at 40 ° C to 70 ° C on the urea at a temperature of 30 ° C to 80 ° C at the front end of the coating drum. The coating material is 40% rosin + 30% wax oil + 30 % fatty acid mixture.

(2) At the end of the coating drum, a layer of nutrient powder rich in medium and trace elements is sprayed on the urea to prepare a new type of urea containing medium and trace elements.
The method for rapidly preparing a novel urea containing a medium trace element according to claim 1, wherein the preparation method of the nutrient powder rich in medium and trace elements is:

a) nutrient design of nutrient powder: refer to crop demand and soil nutrient data for medium and trace element collocation, and mix to obtain powder 1;

b) Adhesive powder adhesion design: sodium lignin sulfonate or potassium lignosulfonate and the powder 1 obtained in the above step a) is mixed to obtain a powder 2;

c) Anti-knot effect design of the nutrient powder: the powder 2 prepared in the above step b) is uniformly mixed with the modifier which accounts for 0.1-20% of the total amount of the nutrient powder, and sent to the micro-powder vortex machine for grinding and modification. Sex, until the powder mesh reaches 200-1000 mesh, that is, the nutrient powder rich in medium and trace elements finally used to coat urea.
The method for rapidly preparing a novel urea containing a medium trace element according to claim 1, wherein the urea is urea prepared by a high column, or urea prepared by a drum device, or fluidized bed granulation. Prepared urea, or urea prepared by extrusion.
The method for rapidly preparing a novel urea containing a medium trace element according to claim 1, wherein the medium element material is calcium sulfate, calcium nitrate, potassium sulfate, ammonium sulfate, magnesium sulfate, calcium chloride or magnesium chloride. , magnesium oxide, sulfur or a mixture of two or more;
The method for rapidly preparing a novel urea containing a medium trace element according to claim 1, wherein the trace element material is zinc sulfate, copper sulfate, iron sulfate, manganese sulfate, molybdenum sulfate, zinc nitrate or copper nitrate. , ferric nitrate, manganese nitrate, molybdenum nitrate, sodium borate, potassium borate, sodium tetraborate, boric acid, sodium chloride, potassium chloride, ammonium chloride, zinc oxide, copper oxide, ferric oxide, triiron tetroxide, A single substance of manganese oxide or molybdenum oxide or a mixture of two or more.
The method for rapidly preparing a novel urea containing a medium trace element according to claim 2, wherein the modifier is one or a mixture of two or more of stearic acid, paraffin, mineral oil and vegetable oil. .