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Slow release fertilizer comprising fly ash gel and preparation method of slow release fertilizer

A slow-release fertilizer and fly ash technology, applied in fertilizer mixtures, layered/coated fertilizers, fertilization devices, etc., can solve the problems of fertilizer nutrient waste, limited nutrient absorption, loss of nitrogen and potassium fertilizers, etc. The speed of decomposition, the increase in specific surface area, the effect of fixing fertilizer nutrients

Active Publication Date: 2015-02-18
内蒙古博大实地化学有限公司
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

However, the following problems still exist in the actual use of water-soluble fertilizers: First, in the process of integrated water and fertilizer fertilization, water and fertilizer tend to be concentrated in a small area, and long-term high-concentration fertilization will cause "fertility" to the root system of crops; second, Due to the fast dissolution rate of water-soluble fertilizers, the absorption of nutrients by crops within a certain period of time is limited, and fertilizer nutrients are easily lost with water and soil, resulting in waste of water-soluble fertilizers
[0004] Chinese Patent Publication No. CN102924188A discloses a potassium ammonium phosphate compound water-soluble fertilizer, which simply mixes nitrogen source, phosphorus source, potassium source and trace elements directly, and has good solubility, but the phosphorus fertilizer in irrigation and fertilization is easily fixed by the soil, which is difficult To achieve the purpose of effectively supplying the roots of crops, and at the same time, excess nitrogen and potassium fertilizers are easy to lose with water, resulting in waste of fertilizer nutrients
[0005] Chinese Patent Publication No. CN103539508A discloses a water-soluble fertilizer with a large amount of elements and a preparation method thereof. In the method, urea, monoammonium phosphate, potassium sulfate or potassium chloride are mixed and stirred, and then phosphoric acid, humic acid and boric acid are added to mix and stir. Solve the dissolution problem of potassium sulfate or potassium chloride, but in the actual use process, due to the high water content of each component, it is easy to agglomerate, and various compounds are easily mixed directly to produce some water-insoluble substances. During the spraying process Moderately easy to clog the nozzle
But present slow-release fertilizers are all solid fertilization methods, such as a kind of compound slow-release fertilizer with perlite as the carrier disclosed by Chinese Patent No. CN102826920A, low-formaldehyde urea-formaldehyde resin-gypsum-bentonite-based slow-release fertilizer disclosed by Chinese Patent Publication No. CN103333033A The preparation method of release fertilizer, the Chinese Patent Publication No. CN102910977A discloses a compound slow-release fertilizer and its preparation method and application, etc., all adopt insoluble or insoluble compounds to wrap or load the fertilizer, which cannot be dissolved in water , so the integration of water and fertilizer cannot be realized, resulting in a waste of human resources and time

Method used

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  • Slow release fertilizer comprising fly ash gel and preparation method of slow release fertilizer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Put 30 parts by weight of fly ash into a ball mill and grind for 5 minutes, with a particle size of 300 mesh;

[0031] (2) Put the ground fly ash into the ion beam irradiation device, choose energy 5keV, dose 1000×2.0×10 13 ions / cm 2 , select the nitrogen ion beam to irradiate the active fly ash for 10 minutes to obtain the modified fly ash;

[0032] (3) Put the modified fly ash into the microwave reactor, and prepare a mixed solution with 2mol / L sodium carbonate solution at a solid-to-liquid ratio of 2.5. Set the microwave parameters: temperature 60°C, speed 200 r / min , and reacted for 40 min to obtain fly ash gel;

[0033] (4) Dissolve 40 parts by weight of calcium superphosphate and 40 parts by weight of potassium chloride in water to form a saturated solution, add the saturated solution of chemical fertilizer to the gel solution in step (2), control the temperature at 40°C, and Stir at 800 r / min speed for 20 min to obtain a mixture of fly ash gel and chemica...

Embodiment 2

[0036] (1) Put 20 parts by weight of fly ash into a ball mill and grind for 10 minutes, with a particle size of 500 mesh;

[0037] (2) Put the ground fly ash into the ion beam irradiation device, set the energy range to 10keV, and the dose to 900×2.0×10 13 ions / cm 2 , select the nitrogen ion beam to irradiate the active fly ash for 12min to obtain the modified fly ash;

[0038] (3) Put the modified fly ash into the microwave reactor, and prepare a mixed solution with 2mol / L sodium acetate solution at a solid-to-liquid ratio of 2.6, and set the microwave parameters: temperature 70°C, speed 300 r / min , and reacted for 30 min to obtain fly ash gel;

[0039] (4) 40 parts by weight of urea, 20 parts by weight of superphosphate and potassium nitrate of 10 parts by weight are dissolved in water to form a saturated solution, and the saturated solution of chemical fertilizer is added to the gel solution in step (2), and the control Stir at a temperature of 50°C for 15 minutes at a s...

Embodiment 3

[0042] (1) Put 10 parts by weight of fly ash into a ball mill and grind for 15 minutes, with a particle size of 800 mesh;

[0043] (2) Put the ground fly ash into the ion beam irradiation device, set the energy range to 15keV, and the dose to 800×2.0×10 13 ions / cm 2 , select the nitrogen ion beam to irradiate the active fly ash for 15 minutes to obtain the modified fly ash;

[0044] (3) Put the modified fly ash into the microwave reactor, and prepare a mixed solution with 2mol / L sodium phosphate solution at a solid-to-liquid ratio of 2.7, and set the microwave parameters: temperature 80°C, speed 400 r / min , and reacted for 25 min to obtain fly ash gel;

[0045] (4) Dissolve 40 parts by weight of potassium dihydrogen phosphate and 20 parts by weight of potassium sulfate in water to form a saturated solution, add the saturated solution of chemical fertilizers to the gel solution in step (2), control the temperature at 60°C, and Stir at a speed of 600 r / min for 10 min to obtai...

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Abstract

The invention belongs to the field of fertilizer, and particularly relates to slow release fertilizer comprising fly ash gel and a preparation method of the slow release fertilizer. The slow release fertilizer comprising fly ash gel is characterized in that fly ash which is solid waste of a fuel factory is taken as the raw material, modified through ion beam irradiation, and excited by an active exciting agent to form a gel solution with a three-dimensional network structure; and in a gel forming process, the surface energy of the fly ash is increased, the adsorbability is enhanced, a large amount of chemical fertilizer can be adsorbed after the fly ash is mixed with a chemical fertilizer solution, the chemical fertilizer is fixed in the network structure of the gel after adsorption, so that the release and decomposition speed of the chemical fertilizer is effectively slowed, and the slow release purpose is achieved. The slow release fertilizer can be dispersed in an aqueous solution to form the gel and can be used for irrigation and fertilization with water, water and fertilizer integration is facilitated, the raw material source is wide, the production technology is simple, and the slow release fertilizer has positive significance on increase of crop yield.

Description

technical field [0001] The invention belongs to the field of slow-release fertilizers, in particular to a fly ash gel slow-release fertilizer and a preparation method thereof. Background technique [0002] China is a large agricultural country. With the continuous development of agricultural technology, fertilizers are becoming more and more important in agriculture, but the contribution rate of traditional chemical fertilizers to food growth is only 46.3%, because in the process of agricultural production, a large amount of traditional fertilizers Leaching and volatilization will reduce soil fertility and crop quality, causing a lot of economic losses, and at the same time causing environmental damage to the soil environment. In addition, China's water resources are severely scarce, and the water used for farming is even more precious. The direction of agricultural development is gradually shifting to resource conservation. Simultaneous irrigation and fertilization, that is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00C05G3/08C05G3/90
CPCC05G3/90C05G5/30
Inventor 陈庆孙丽枝
Owner 内蒙古博大实地化学有限公司
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