Preparation method of low-formaldehyde urea-formaldehyde resin-gypsum-bentonite-based slow-release fertilizer

A urea-formaldehyde resin, low-formaldehyde technology, applied in fertilizer mixtures, fertilization devices, agricultural gas emission reduction and other directions, can solve the problems of high energy consumption and long stirring time, and achieve high slow-release nitrogen content, good effect and good effect. Effect

Inactive Publication Date: 2015-08-05
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These preparation processes generally use stirring mixing technology to carry out the mixing chemical reaction process, which takes a long time to stir and consumes a lot of energy.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A preparation method of low-formaldehyde urea-formaldehyde resin-gypsum-based slow-release rice nitrogen fertilizer, the specific preparation process comprising the following steps:

[0032] The first step, the preparation of ammonium sulfate: take phosphogypsum, ammonium bicarbonate as raw material, according to the stoichiometric ratio of CaSO4 2H2O and NH4HCO3 reaction, the consumption of CaSO4 2H2O is excessive 5% by weight percentage; Gypsum, ammonium bicarbonate Put it into the ball mill, put the ball into the ball according to the weight ratio of the ball to the material of 5, add water with 12% of the dry weight of the material, and at room temperature, after the ball mill reacts for 20 minutes to 60 minutes, the ammonium sulfate masterbatch is obtained, the nitrogen content is 10.2%, and the water The content is 24.5%.

[0033] The second step, the preparation of urea gypsum: take phosphogypsum and urea as raw materials, according to the stoichiometric ratio of...

Embodiment 2

[0040] A preparation method of low-formaldehyde urea-formaldehyde resin-gypsum-based slow-release rice compound fertilizer, the specific preparation process comprising the following steps:

[0041] The first step to the sixth step of the preparation process are the same as in Example 1.

[0042]The 7th step, take the ammonium sulfate of 10.2 weight parts respectively, the urea gypsum of 20.0 weight parts, the superphosphate of 57.8 weight parts (phosphorus content 11.3%), the potassium chloride (potassium content 46.5%) of 12 weight parts, mix Evenly, add 15% of its weight urea-formaldehyde resin-gypsum-bentonite complex / mixed slow-release material to this mixture; through repeated extrusion 5 to 10 times, make it fully mixed and react, then vibrate, crush, sieve, and disc-made The granules are made into spherical granules with smooth surface, high density, and a particle size of 3-6 mm; when dried to a moisture content of less than 2.5%, low-formaldehyde urea-formaldehyde res...

Embodiment 3

[0044] A kind of preparation method of low-formaldehyde urea-formaldehyde resin-gypsum-based slow-release corn nitrogen fertilizer, its specific preparation process comprises the following steps:

[0045] The first step to the sixth step of the preparation process are the same as in Example 1.

[0046] The 7th step, take by weighing the ammonium sulfate of 37.5 parts by weight respectively, the urea gypsum of 62.5 parts by weight, mix homogeneously, add its weight 15% urea-formaldehyde resin-gypsum-bentonite complex / mixed slow-release material to this mixed material; 5 to 10 times to make it fully mixed and reacted, then vibrated, crushed, sieved, and disc granulated to obtain spherical particles with a smooth surface, high density, and a particle size of 3 to 6 mm; dry to a moisture content of less than 2.5%, The low-formaldehyde urea-formaldehyde resin-gypsum-bentonite-based slow-release corn nitrogen fertilizer can be prepared.

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Abstract

The invention discloses a preparation method of a low formaldehyde resin-gypsum-bentonite-based controlled release fertilizer. The preparation method is characterized by comprising the steps of: preparing an ammonium sulfate master batch, preparing a urea gypsum master batch, preparing bentonite, preparing hemihydrate gypsum, and preparing a low formaldehyde resin-gypsum-bentonite compound / mixed controlled-release fertilizer. According to the preparation method, the low formaldehyde resin-gypsum composite material is used as an adhesive and is compounded with the bentonite to form a controlled-release system, and the low formaldehyde resin-gypsum-bentonite-based controlled release fertilizer is prepared by using an integrated preparation technology of extruding and mixing reaction, vibrating and sieving and disc pelleting. The preparation method has the characteristics of low energy consumption, low formaldehyde content, high controlled release nitrogen content, and the like; the prepared controlled-release fertilizer is capable of remarkably increasing the yield of grains, increasing the utilization rate and reducing the environment pollution caused by agricultural emission; meanwhile, an effective path is provided for comprehensive utilization of industrial gypsum.

Description

technical field [0001] The invention belongs to fertilizers, and relates to a preparation method of a low-formaldehyde urea-formaldehyde resin-gypsum-bentonite-based slow-release fertilizer. The low-formaldehyde urea-formaldehyde resin-gypsum-bentonite-based slow-release fertilizer prepared by the present invention is suitable for agricultural chemical fertilizers, and contains slow-acting and quick-acting nitrogen components; the present invention uses urea-formaldehyde resin-hemihydrate gypsum complex / mixed material as an adhesive, and then combined with Bentonite is compounded to form a slow-release system, which is prepared through extrusion mixing reaction, vibration screening, and disc granulation integrated preparation technology to obtain low-formaldehyde urea-formaldehyde resin-gypsum-bentonite-based slow-release fertilizer, so that the overall release of fertilizer particles The speed is reduced, so that the slow release of phosphorus and potassium is also achieved, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05G3/08C05G3/90
CPCY02P60/21
Inventor 邓跃全董发勤李娜李丽娟罗绍东邓智友
Owner SOUTHWEAT UNIV OF SCI & TECH
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