Powdery potassium chloride granulation method taking synthesised urea resin as binder

A technology of urea-formaldehyde resin and potassium chloride, applied in fertilizer mixture, fertilization device, application, etc., can solve the problems of high production cost of binder, low strength of fertilizer particles, complicated preparation process, etc., and achieve low production cost and smooth surface , The effect of simple preparation process

Active Publication Date: 2015-07-01
SHANDONG AGRICULTURAL UNIVERSITY
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AI Technical Summary

Problems solved by technology

[0005] In order to solve the above problems, the invention provides a method for granulating powdery potassium chloride that synthesizes urea-formaldehyde resin as binder; first uses urea and formaldehyde solution to synthesize urea-formaldehyde resin binder; powdery potassium chloride and auxiliary substances Sieve and subdivide, slowly spray urea-formaldehyde binder on the mixture of powdery potassium chloride and auxiliary substances in the disc granulator, so that the fertilizer powder gradually becomes spherical particles of 2-5 mm, and pass through the drum after sieving Dry to form spherical fertilizer granules with smooth surface, improve its storage, transportation and sowing performance, facilitate the simultaneous sowing of fertilizer and uniform fertilization, facilitate mechanical fertilization, and facilitate controlled-release potassium fertilizer coating, aiming to solve the existing adhesion The fertilizer production cost is high and the preparation process is complicated, and the prepared fertilizer particles have low strength and poor moisture absorption resistance.

Method used

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  • Powdery potassium chloride granulation method taking synthesised urea resin as binder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Weigh 0.15kg of urea and 0.0675kg of formaldehyde solution (the molar ratio of urea and formaldehyde is 2) in the reactor, set the temperature of the reactor to 50°C, and under the action of the stirrer, after the urea is completely dissolved, add a concentration of 1 % sodium hydroxide solution to adjust the pH to 9, add 1.29g of ammonium chloride as a catalyst after a constant temperature reaction at 50°C for 1 hour, adjust the pH to 4 with dilute hydrochloric acid solution, keep the temperature at 50°C, and react for 1 hour before the urea-formaldehyde resin is cured The reactant was transferred to an atomizing tank and water was added to prepare a urea-formaldehyde resin binder suspension with a mass concentration of 25%.

[0021] Sieve the powdery potassium chloride, the sieve fineness is 60 mesh, and remove the irregular large particle potassium chloride of agglomeration. Take by weighing 5kg of sifted powdered potassium chloride in a disc granulator with a disc d...

Embodiment 2

[0023] The processing is as in Example 1, but only differs in the types and amounts of auxiliary substances added. Add 0.3 kg of calcium superphosphate through a 60-mesh sieve. The prepared spherical particle potassium chloride has a spherical rate of 75% and a particle strength of 22N. The content of each component in the dry weight of the spherical potassium chloride granule is: 3.64% of urea-formaldehyde resin, 5.45% of superphosphate, and 90.91% of potassium chloride (54.55% of available potassium).

Embodiment 3

[0025] The processing is as in Example 1, but only the type and amount of auxiliary substances added and the concentration of the urea-formaldehyde resin binder suspension are different. Add 0.15 kg of gypsum powder through a 60 mesh sieve, and the concentration of the urea-formaldehyde resin binder suspension used is 40%. The spheroidization rate of the prepared spherical granular potassium chloride is 65%, and the granule strength is 90N. The content of each component in the dry weight of the spherical potassium chloride granule is: 7.21% of urea-formaldehyde resin, 2.70% of gypsum powder, 90.09% of potassium chloride (54.05% of available potassium).

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Abstract

The invention provides a powdery potassium chloride granulation method taking synthesised urea resin as a binder. The powdery potassium chloride granulation method comprises the following steps: by taking the reaction product, namely urea resin of urea and formaldehyde solution as a powdery potassium chloride binder, slowly and uniformly spraying the urea resin on the mixture of powdery potassium chloride and auxiliary substances to enable the mixture to become spherical fertilizer granules, discharging and then sieving the fertilizer granules with sizes of 2-5mm, feeding the sieved fertilizer granules into a drying system and drying, so as to obtain spherical granules with smooth surfaces and a high hardness. The urea resin binder suspension used in the powdery potassium chloride granulation method provided by the invention is high in binding property and capable of providing a part of controlled-release nitrogen; the spherical granular potassium chloride produced by the synthesised binder is high in strength, smooth in surface, good in moisture absorption resistance, low in production cost, and good in storage, transport, sowing and fertilizing performances; the powdery potassium chloride granulation method is especially suitable for preparation for film-coated controlled-release potassium chloride.

Description

(1) Technical field [0001] The invention relates to a powdery potassium chloride granulation method using synthetic urea-formaldehyde resin as a binder, belongs to the technical field of fertilizers, and specifically relates to a method for manufacturing spherical granular potassium chloride fertilizer by using powdery potassium chloride as a raw material. (2) Background technology [0002] Potassium resources are scarce in my country, and potash fertilizers mainly rely on imports. The main types of potassium fertilizers on the market are potassium chloride and potassium sulfate. Potassium chloride has high potassium content and its price is much lower than potassium sulfate. It is the main type of potassium fertilizer used in agricultural production. However, the salinity coefficient of potassium chloride is higher than that of potassium sulfate, and it is not conducive to seed germination and seedling growth when applied on saline-alkali land or dry soil with poor drainage...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00
Inventor 郭延乐张民刘之广杨越超耿计彪李培强
Owner SHANDONG AGRICULTURAL UNIVERSITY
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