A method of direct granulation to produce urea-formaldehyde slow-release compound fertilizer by low-temperature concentrated solution method

A technology of slow-release compound fertilizer and concentrated solution, which is applied in the directions of urea compound fertilizer, nitrogen fertilizer, fertilization device, etc., can solve problems such as being unfavorable for wide-scale popularization and application, low content of slow-release effective nitrogen, and affecting the slow-release performance of products, etc. Achieve the effect of being conducive to large-scale promotion and application, round product particles, and easy control

Active Publication Date: 2021-02-12
SINOCHEM AGRI LINYI R&D CENT CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Although the above methods can all produce urea-formaldehyde slow-release fertilizers, there are serious problems as follows: the products produced by extrusion granulation have uneven appearance and poor quality, which is not conducive to mechanized application; to form slurry with fertilizer raw materials In post-spraying granulation production, due to the high temperature of the slurry, the large range of pH changes, and the fast reaction speed of urea-formaldehyde, it is difficult to control the components of urea-formaldehyde, and it is easy to have low slow-release effective nitrogen content, or hot water insoluble nitrogen The phenomenon of high content affects the slow-release performance of the product, which is not conducive to the application on crops
Moreover, the water content of the slurry is high, and the drying cost is high, which increases the production cost of the product, which is not conducive to large-scale promotion and application

Method used

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  • A method of direct granulation to produce urea-formaldehyde slow-release compound fertilizer by low-temperature concentrated solution method
  • A method of direct granulation to produce urea-formaldehyde slow-release compound fertilizer by low-temperature concentrated solution method
  • A method of direct granulation to produce urea-formaldehyde slow-release compound fertilizer by low-temperature concentrated solution method

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Effect test

Embodiment 1

[0040] Embodiment 1: The low-temperature concentrated solution method of the present embodiment directly granulates the method for producing urea-formaldehyde slow-release compound fertilizer as follows:

[0041] (1) Put 560 kilograms of urea and 440 kilograms of 36% formaldehyde solution into a reactor at 30° C. and stir at a stirring speed of 60 r / min to fully dissolve urea to form a mixed solution of urea and formaldehyde.

[0042](2) Use about 15 liters of 20% KOH solution, drop it into the urea-formaldehyde mixed solution, adjust the pH value of the solution to 11, and continue stirring the mixed solution for 2 hours, so that urea and formaldehyde undergo addition reaction to form urea-formaldehyde Addition solution.

[0043] (3) the urea-formaldehyde addition solution is added in the granulation drum according to the flow rate of 1.5 tons / hour, and the amount of other compound fertilizer raw materials in the granulation drum is 10 tons / hour, while spraying 30% sulfuric a...

Embodiment 2

[0045] Embodiment 2: The low-temperature concentrated solution method of the present embodiment directly granulates the method for producing urea-formaldehyde slow-release compound fertilizer as follows:

[0046] (1) Put 500 kilograms of urea and 500 kilograms of 36% formaldehyde solution into a reactor at 40° C. and stir at a stirring speed of 60 r / min to fully dissolve urea to form a mixed solution of urea and formaldehyde.

[0047] (2) Use about 12 liters of 20% NaOH solution, drop it into the urea-formaldehyde mixed solution, adjust the pH value of the solution to 10, and continue stirring the mixed solution for 1.5 hours, so that urea and formaldehyde undergo addition reaction to form urea-formaldehyde Addition solution.

[0048] (3) formaldehyde addition solution is added in the granulation drum according to the flow rate of 1.2 tons / hour, and other compound fertilizer raw materials are 10 tons / hour in the granulation drum, and contain the sulfuric acid solution that spr...

Embodiment 3

[0050] Embodiment 3: The low-temperature concentrated solution method of the present embodiment directly granulates the method for producing urea-formaldehyde slow-release compound fertilizer as follows:

[0051] (1) 580 kg of urea and 420 kg of 36% formaldehyde solution are dropped into a reactor at 50° C. and stirred at a stirring speed of 60 r / min to fully dissolve urea to form a mixed solution of urea and formaldehyde.

[0052] (2) Use about 10 liters of 20% NaOH solution, drop it into the urea-formaldehyde mixed solution, adjust the pH value of the solution to 9, and continue to stir the mixed solution for 1 hour, so that urea and formaldehyde undergo addition reaction to form urea-formaldehyde Addition solution.

[0053] (3) formaldehyde addition solution is added in the granulation drum according to the flow rate of 1.2 tons / hour, and other compound fertilizer raw materials are 10 tons / hour in the granulation drum, and contain the sulfuric acid solution that sprays 40% ...

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Abstract

The invention provides a method for directly granulating urea-formaldehyde slow-release compound fertilizer by low-temperature concentrated solution method, which is characterized in that it comprises the following steps: (1) at a temperature of 30-60°C, urea and formaldehyde solution are placed in a reaction kettle Stir in middle, make described urea fully dissolve, form urea-formaldehyde mixed solution; (2) use alkaline solution, the pH value of described urea-formaldehyde mixed solution is adjusted to 8-12, keep stirring for 0.5-2 hours, make described Addition reaction occurs between urea and the formaldehyde to form a urea-formaldehyde addition solution; (3) transport the urea-formaldehyde addition solution to the compound fertilizer granulation drum, fully mix and granulate with other compound fertilizer raw materials, and add The acid solution is used to condense and solidify the urea-formaldehyde addition solution to form urea-formaldehyde, thereby obtaining the urea-formaldehyde slow-release compound fertilizer. The invention also provides the urea-formaldehyde slow-release compound fertilizer prepared by the method.

Description

technical field [0001] The invention belongs to the field of slow-release compound fertilizers, and in particular relates to a method for directly granulating urea-formaldehyde slow-release compound fertilizers by a low-temperature concentrated solution method. In addition, the invention also relates to the urea-formaldehyde slow-release compound fertilizers prepared by the method of the invention. Background technique [0002] Urea-formaldehyde is a slow-release nitrogen fertilizer formed by the condensation of urea and formaldehyde. Its synthesis is based on urea and formaldehyde as the main raw materials. It first undergoes an addition reaction under alkaline conditions, and then undergoes a condensation reaction in an acidic medium to form urea-formaldehyde. . Under addition reaction conditions, urea and formaldehyde produce methylol urea, and under condensation reaction conditions, urea and methylol urea further react to form urea-formaldehyde polymers with different mo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05C9/02C05G3/40C05G5/30C05G3/90
CPCC05C9/02C05G3/90
Inventor 焦卫平刘朋飞王金龙任先顺王子浩
Owner SINOCHEM AGRI LINYI R&D CENT CO LTD
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