Monoammonium phosphate particle screening system

Abstract

The invention discloses a monoammonium phosphate particle screening system belonging to the field of corollary equipment of compound fertilizer production technology. The screening system is realized by the following devices and a connecting mode and is formed by successively connecting a meshwork vibrating screen, an transporter 1, an bucket elevator 1, an drum sieve 1, a hopper, a feeding belt and an drum sieve 2, wherein the large granulometric class returning port of the meshwork vibrating screen, an transporter 2, a crusher, an bucket elevator 2, a returning belt, an transporter 3 and a comminutor are successively connected; the small granulometric class returning port of the meshwork vibrating screen is connected with an transporter 4 and is arranged above the returning belt; and a trough plate is arranged below the small granulometric class returning port of the drum sieve 1, and one end of the trough plate downwards inclines and is arranged above the returning belt. The screening system overcomes the defects that the built-in screening system is easy to scale, frequently overhauls and has short use period, and the appearance of the screened product is poor; and the invention ensures the appearance quality of the particle while improving the yield of the monoammonium phosphate particle and adjusts the product particle grade to be produced as required.

Description

technical field [0001] The invention relates to the field of supporting equipment for a compound fertilizer production process, in particular to a monoammonium phosphate particle screening system. Background technique [0002] Monoammonium phosphate (MAP), also known as ammonium dihydrogen phosphate, is a water-soluble quick-acting compound fertilizer. The ratio of available phosphorus (AP2O5) to total nitrogen (TN) is about 5.44:1, and it is the main variety of high-concentration phosphorus compound fertilizer. One, the product can generally be used as topdressing fertilizer, and it is also the most important basic raw material for the production of ternary compound fertilizer and BB fertilizer. [0003] In the production of monoammonium phosphate granules, the drum granulator realizes the whole process of monoammonium phosphate from slurry to granule forming. There are many iron plates shaped like shovels welded on the inner wall of the granulator. During the drying and g...

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Problems solved by technology

[0004] The disadvantage of this device is that the original granulator has a built-in screen with a small area and insufficient screening of ammonium phosphate particles, resulting in a large part of the particles sent back to the crusher for crushing as finished products, which restricts the quality of finished products. The output is increased, and the appearance quality is poor; during the spray granulation process, the built-in screen of the granulator contacts the ammonium phosphate slurry and screens the fine particles sticking to the slurry, which makes the screen easy to scale and the maintenance cycle It is relatively short, with an average of 7 working days, it is necessary to stop production and clean the screen once. Frequent cleaning of the screen shortens the service life of the screen, and shutdown maintenance affects the production and operation hours of the equipment, which restricts the further increase in the output of finished products.

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