Production system of water-soluble compound fertilizer and production method

Abstract

The invention discloses a production system of water-soluble compound fertilizer and a production method, and belongs to the technical field of production of compound fertilizer. The production systemcomprises a granulation section, an aftertreatment section, a tail-gas treatment section and a feeding and returning section, wherein the granulation section comprises a roller granulation device, anammonium-phosphate pretreatment groove, a regulating groove and a tubular reactor, and the ammonium-phosphate pretreatment groove, the regulating groove and the tubular reactor are connected in sequence by pipelines; the roller granulation device comprises a roller obliquely arranged in a front-rear direction, a feeding port at the front end of the roller, a discharging structure at the rear endof the roller, an acid mixer extending into the front part of the roller from the front part, and an ammonium tube bundle extending to the front part of the roller from the rear part; the rear part ofthe tubular reactor extends into the front part of the roller. The production system and the production method disclosed by the invention have the beneficial effects that ammonium-phosphate slurry isregulated to a proper condition by utilizing washing liquor, and then is introduced into a special granulation structure to realize granulation; a product with low water content and high granular strength can be obtained, and has the advantages of reduced caking property, strong caking resistance and good water solubility.

Description

technical field [0001] The invention belongs to the technical field of compound fertilizer production, and in particular relates to a production system and a production method of a water-soluble compound fertilizer, in particular to the production of a sulfur-based water-soluble fertilizer. Background technique [0002] Compound fertilizer is a chemical fertilizer containing two or more nutrient elements (N, P, K, Ca, Mg, S, etc.) Elements) content is single, it can be formulated according to the acidity and alkalinity of the soil, and the different content of nutrients in the soil in different regions. [0003] There are two main methods of preparing compound fertilizers, physical and chemical. Common physical methods include melt tower granulation method, pellet method and slurry method; chemical method is acid method. When the compound fertilizer is produced by the granulation method and the slurry method, it is generally necessary to add 6%-10% water to the raw materia...

AI Technical Summary

Problems solved by technology

[0009] (1) The product strength is low, usually less than 25N, and the moisture content is greater than 5%, resulting in high subsequent drying pressure and easy agglomeration of the final product;

[0010] (2) In general, it is necessary to add additional binders (such as clay) or fillers to ensure the granulation rate, which not only costs a lot, but also reduces the water solubility of the product;

[0011] (3) The particle uniformity is not good, the return material is high, the return rate can reach 20-25%, and the production efficiency is low

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