Technological method of improving small particle product strength and elliminating product dust

A process method and small particle technology, applied in the direction of fertilizer form, application, nitrogen fertilizer, etc., can solve the problems of broken dust, easy agglomeration, small particles, etc., to increase particle size and strength, improve product properties, and reduce granulation load effect

Inactive Publication Date: 2007-04-18
LUTIAN CHEM CORP
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

For example, Chinese invention patent 02116695.1 discloses an improved large-grain urea combined drum granulation method and equipment, which to a certain extent improves the difficult problems of small urea product particles, high dust, and easy agglomeration, but its process and equipment Complicated and unable to solve the fundamental problem; Chinese utility model patent 03229978.8 discloses a process of using a fluidized bed to cool the particles in the prilling tower and winnowing and dust removal, but this process cannot solve the fundamental problems of small particle size and poor strength The problem is that the product is still broken and dusted during the packaging, storage and transportation process

Method used

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  • Technological method of improving small particle product strength and elliminating product dust

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Embodiment 1

[0031] A. Small particles with a particle size of 0.85~2.8mm from the urea prilling tower enter the fluidized bed through a belt, and the bed temperature is controlled at 110°C through the fluidized air, and 98.5% of the urea melt from the evaporation system of the urea unit is introduced into the fluidized bed , The particles are continuously coated after being atomized by the nozzle. The weight ratio of seed crystal to urea melt is controlled at 1;

[0032] B. Small particles with a particle size of 0.85~2.8mm from the urea prilling tower enter the fluidized bed through a belt, and the bed temperature is controlled at 110°C through fluidized air. 90% of the urea melt from the evaporation system of the urea unit is introduced into the fluidized bed. In the bed, the particles are continuously coated after being atomized by the nozzle, and the ratio of the seed crystal to the urea melt is controlled at 1.2 or 0.6.

[0033] Item

Embodiment 2

[0035] A. Small particles with a particle size of 1.0~2.5mm out of the ammonium nitrate prilling tower enter the fluidized bed through a belt, and the bed temperature is controlled at 115°C through fluidized air. The 98% ammonium nitrate solution from the evaporation system of the ammonium nitrate unit is introduced into the stream. In the fluidized bed, the particles are continuously coated after atomization by the nozzle, and the weight ratio of the seed crystal to the ammonium nitrate solution is controlled at 1.5 or 1.2;

[0036] B. Small particles with a particle size of 1.0~2.5mm out of the ammonium nitrate prilling tower enter the fluidized bed through a belt, and the bed temperature is controlled at 115°C through fluidized air. The 85% ammonium nitrate solution is introduced into the stream from the evaporation system of the ammonium nitrate device. In the fluidized bed, the particles are continuously coated after atomization by the nozzle, and the weight ratio of the seed...

Embodiment 3

[0039] Using this process, low-nitrogen compound fertilizer can be supplemented with nitrogen to increase the nitrogen content, and the nitrogen (N) phosphorus (P) from the compound fertilizer device 2 O 5 ) Potassium (K 2O) The low-nitrogen compound fertilizer with a ratio of 12-18-15 enters the fluidized bed granulator in the form of seed crystals, and the bed temperature is controlled at 110 ℃ through fluidized air, and 95% of the urea solution from the evaporation system of the urea unit is introduced In the fluidized bed, the particles are continuously coated after atomization by the nozzle, and the weight ratio of the seed crystal to the urea solution is controlled at 1.5.

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Abstract

The present invention discloses a technological process for raising strength of small granule product and removing dust from finished product. Said technological process includes the following steps: directly feeding the small granules discharged from granulation tower into fluidized bed and making the small granules be fluidized by cold air blown into the fluidized bed by blower fan; at the same time making the feed liquor be directly introduced into the fluidized bed, atomized by means of nozzle and repeatedly sprayed on the small granules to cover the small granules; setting cooling stage in the rear portion of said fluidized bed, cooling the material discharged from fluidized bed, feeding said discharged material into a vibration screen to screen the small granules, making the very small granules as seed crystal be returned into the fluidized bed and making the granules meeting the grain size requirements as finished product be fed into packaging stage.

Description

Technical field [0001] The invention relates to the granulation of chemical fertilizers, in particular to a granulation process in which a fluidized bed coating tower-type granulation product is used to improve the dustiness of the product and the easy agglomeration of the product. Background technique [0002] At present, most of the granulation of urea and ammonium nitrate in my country adopts tower spray granulation. In recent years, urea and ammonium nitrate production equipment have been expanded to increase production. However, the prilling tower is restricted by conditions such as large investment and long construction period, and cannot be expanded accordingly, making the prilling system in overload operation. , Strength is difficult to guarantee. Especially in the high temperature season in summer, the temperature of the particles discharged from the prilling tower far exceeds the standard, the product size distribution is wide, the average particle size is small, the pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G5/00C05C9/00C05C1/02
Inventor 戴志谦李天文李庆刘勤伍泽民苟云桃
Owner LUTIAN CHEM CORP
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