Instant less-residue compound fertilizer and preparation method thereof

Abstract

The invention discloses an instant less-residue compound fertilizer and a preparation method thereof. The compound fertilizer comprises monoammonium phosphate, white potassium or potassium sulfate, urea, ammonium sulfate, concentrated sulfuric acid, liquid ammonia and medium / trace dissolution-aided additives. By using the self-made medium / trace dissolution-aided additives, the water soluble effect of the compound fertilizer and the clarity of aqueous solution are guaranteed, and the monoammonium phosphate raw material with less residue content is used, so that the compound fertilizer has the advantages that the residue rate can be maintained at 5 percent or below under the condition that industrially pure raw materials are not used, the compound fertilizer is prepared by utilizing an ammoniation process, and high conglomeration rate of 70-85 percent of the product can be guaranteed under the condition that a soluble filler and an adhesive are not added. Moreover, the problems such as hardening, pulverization, low strength and strength degradation of the product are solved, and high quality and low price can be really achieved.

Description

technical field [0001] The invention relates to an instant low-slag type compound fertilizer, in particular to a preparation method of an instant low-slag type compound fertilizer. Background technique [0002] Water-soluble fertilizer (Water Soluble Fertilizer, referred to as WSF), is a multi-component compound fertilizer that can be completely dissolved in water. It can be quickly dissolved in water and is more easily absorbed by crops. The key point is that it can be applied to sprinkler irrigation, drip irrigation and other facility agriculture to realize the integration of water and fertilizer, and achieve the efficiency of saving water, fertilizer and labor. Compared with traditional superphosphate and ordinary granular compound fertilizers, water-soluble fertilizers have obvious advantages. Its main features are less dosage, convenient use, low cost of use, fast absorption by crops, and high utilization rate of nutrients. In this way, people can completely design t...

AI Technical Summary

Problems solved by technology

[0003] At present, the water-soluble fertilizers produced by domestic compound fertilizer manufacturers generally use high-purity industrial-grade raw materials, soluble fillers and binders in order to reduce the content of water-insoluble substances. The comprehensive application of these three technical means is to solve the problem. The product residue exceeds the standard, the product strength is not enough, it is easy to pulverize and harden, the product balling rate is low, and the production efficiency is low.

However, this will increase the manufacturing cost of water-soluble fertilizers, which will eventually be passed on to the farmers. Therefore, the ton price of water-soluble compound fertilizers on the market is generally above 5,000 yuan, and some are even as high as 8000 yuan

Moreover, in the process of applying these three technical means to produce water-soluble fertilizer, the problems of hardening, pulverization, low strength and strength degradation of the product cannot be completely solved, and there are still relatively serious quality problems

The above three technical means are applied to water-soluble fertilizers produced by ordinary drums or sprayed drums. The pelleting rate of the materials exported by the granulator is only 50%-68%, and the compressive strength of the products is generally in the range of Below 12N, and it is very easy to degrade the strength, resulting in subsequent hardening and dust exceeding the standard. In the process of using the binder, the problem of slow or incomplete dissolution of the product is very easy to occur, causing trouble for farmers to use fertilizer