Method for producing compound fertilizer by high tower granulating

Abstract

The invention discloses a method for producing urea-based granule compound fertilizer by high-tower granulation, which includes pulping and granulation. The pulping is a three-step series-connected, continuous and gradually lowering temperature pulping method, which includes the following steps: adding Flux and urea, urea is melted at low temperature and flows into the first-stage mixing tank; in the first-stage mixing tank, raw materials that do not react with it are added to the molten urea solution, and the molten material obtained after mixing flows into the second-stage mixing tank tank; in the second-stage mixing tank, add monoammonium phosphate, and mix with the melt for less than 4 minutes to obtain a mixed molten slurry; the mixed molten slurry is sprayed into the prilling tower through the double-speed rotating granulation nozzle of the high tower The granulation is completed within. The high-tower granulation method for producing urea-based granular compound fertilizer has the advantages of low temperature operation, low energy consumption, low loss, good slurry fluidity, and good operating environment. The urea-based granule compound fertilizer produced by this method is round and smooth The broken grains are few and uniform.

Description

technical field [0001] The invention relates to a production method of granular compound fertilizers, in particular to an improved high-tower granulation method for producing urea-based granular compound fertilizers. Background technique [0002] At present, with the promotion and application of high-tower granulation technology, the production of compound fertilizer has jumped to a new level. Such as the Chinese patent, the patent number is CN03139601.1, which discloses a method and equipment for producing granular compound fertilizer by high-tower granulation. The urea-based compound fertilizer produced by high-tower granulation technology is popular among users because of its advantages of uniform nutrition, good water solubility, wide application range, and performance far superior to other types of fertilizers. The key technology of the compound fertilizer tower production is the pulping process, the slurry is too thick not only cannot flow in the pipeline, but also ca...

AI Technical Summary

Problems solved by technology

[0004] 1. High reaction temperature leads to nitrogen loss and poor operating environment

[0005] 2. The degree of polymerization of monoammonium phosphate is large, the viscosity of slurry is high, the load of stirring and granulator is increased, and the power consumption is large

[0006] 3. The viscosity of the slurry is high, it is easy to block the nozzle, and the product has many irregular particles

[0007] 4. The reaction temperature is high, the contact time is long, the foam is generated, and it is easy to be boiled

[0008] 5. The granulation temperature is high, the product bursts more, and it is easy to stick to the bottom of the tower

[0009] 6. Under the same cooling conditions, the product is easy to harden

[0010] 7. Except for urea, other materials need to be preheated and ground to consume steam

[0011] 8. Single-stage mixing has high stirring intensity, it is not easy to mix evenly, and it is easy to block the nozzle

[0012] 9. Single-stage mixing is unfavorable for processing the returned materials in production, and it needs to be equipped with ordinary production lines to digest the returned materials, and the investment cost is large