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

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...

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

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