Method for producing compound fertilizer containing nitrate nitrogen potassium sulphate

Abstract

The invention discloses a method for producing a compound fertilizer containing nitrate nitrogen potassium sulphate. The method is achieved by the following steps: (1) preparing ammonium nitrate phosphorus slurry, namely dissolving ammonium nitrate phosphorus by using condensate water at 50-80 DEG C or compound fertilizer exhaust washing liquor; (2) preparing a mixed acid, namely enabling a sulfuric acid solution to react with potassium chloride in a transfer tank to generate potassium hydrogen sulfate, overflowing KHSO4 generated by reaction and excessive H2SO4 solution to a mixed acid geosyncline, and mixing with a phosphoric acid solution which is metered by an ultraphosphate flow meter to generate the mixed acid; (3) carrying out neutral reaction on gas ammonia and mixed acid in a reactor, so as to obtain neutral slurry; (4) mixing the neutral slurry with the ammonium nitrate phosphorus slurry in a feeder trough to form mixed slurry; and (5) spraying the mixed slurry into a pelletizer, so as to obtain the compound fertilizer containing nitrate nitrogen potassium sulphate. The usage of steam is saved, the compound fertilizer particle is good in smoothness, and uniform in granularity, the whiteness is improved, the moisture is well controlled, the utilization rate of the fertilizer is improved, the soil contamination is reduced, and healthy growth of the plant is promoted.

Description

technical field

[0001] The invention relates to a production method of compound fertilizer, in particular to a production method of nitrate nitrogen-containing potassium sulfate type compound fertilizer. Background technique

[0002] The well-known traditional production method of chemical synthesis spray granulation compound fertilizer is to use mixed acid and pure gas ammonia to react in a neutralization tank or a tubular reactor to form a slurry, and further produce compound fertilizer. The compound fertilizer produced is mainly Containing ammoniacal nitrogen, the dissolution is slow and the utilization rate is low; while the nitro compound fertilizer produced by adding nitrate nitrogen to the slurry is easy to dissolve in water and is used to supplement agricultural "nitrogen" elements. It is a crop production and can prolong The growth and harvest periods of crops play a vital role in the growth of crops; adding nitric acid to mixed acid to obtain nitrate nitrogen is un...

Images