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Process for preparing composite N-P-K fertilizer directly from urea solution

A compound fertilizer, NPK technology, applied in the field of direct preparation of NPK compound fertilizer from urea solution, can solve the problems of increasing equipment and energy consumption, complicating the production process, etc., to reduce the load, improve the appearance of particles, and simplify the production. The effect of the process

Inactive Publication Date: 2004-05-26
SHANGHAI RES INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, potassium salt and urea solution form a molten slurry, and the potassium salt needs to be heated to a certain temperature first, which not only increases equipment and energy consumption, but also complicates the production process.

Method used

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  • Process for preparing composite N-P-K fertilizer directly from urea solution

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Concentration is 95% by weight, temperature is 260 grams of urea solution of 123 ℃, pumps into in the drum granulator, powdery ammonium phosphate (containing N 11%, P 2 o 543%) 360 grams, potassium chloride (containing K 2 (260%) 250 grams, potter's clay 140 grams, through the granulation of about 6 minutes, 68.9 ℃ of temperature of granulated material, the moisture content when granulated material goes out granulator mouth is 1.97%, and 93% of balling rate. The granulated material is dried with hot air at a temperature of about 150°C, and the dried material is cooled and sieved to obtain a compound fertilizer with a particle size of 1-4.75mm. Fertilizer product analysis results: N 14.86%, P 2 o 5 15.05%, K 2 O 15.13%, total available nutrients (N+P 2 o 5 +K 2 O)=45.04%, the moisture content of the fertilizer is 0.95%, the strength is 29 Newtons, and the balling rate is 91.5%.

Embodiment 2

[0033] Concentration is 95% by weight, temperature is 400 grams of urea solution of 123 ℃, pumps into the drum granulator, powdery ammonium phosphate (containing N 11%, P 2 o 5 43%) 280 grams, potassium chloride (containing K 2 O 60%) 250 grams, 85 grams of bentonite, through about 12 minutes of granulation, the granulation material temperature was 71.2 ℃, and the moisture content when the granulation material went out of the granulator mouth was 2.05%, and the pelleting rate was 94%. The final material is dried with hot air at a temperature of about 150°C, and the dried material is cooled and sieved to obtain a compound fertilizer with a particle size of 1-4.75mm. Fertilizer product analysis results: N 20.10%, P 2 o 5 12.08%, K 2 O 15.25%, total available nutrients (N+P 2 o 5 +K 2 O)=47.43%, the moisture content of the fertilizer is 1.01%, the strength is 34 Newtons, and the pelleting rate is 92.0%.

Embodiment 3

[0035] Concentration is 70% by weight, temperature is 250 grams of urea solution of 80 ℃, squeezes in the drum granulator with pump, has calcium magnesium phosphate fertilizer (containing P 2 o 5 14%, H 2 O 1%) 500 grams, white fertilizer (containing P 2 o 5 30%, H 2 O 3%) 70 grams, potassium sulfate (containing K 2 O 50%, H 2 (01%) 160 grams, 80 grams of chicken manure that is dried and finely ground, through about 20 minutes of mixing and granulation, the material after granulation is dried with hot air at a temperature of 120~180° C., and the material after drying is cooled, After sieving, compound fertilizers with a particle size of 1-4.75mm are obtained. Fertilizer product analysis results: N 8.00%, P 2 o 5 9.05%, K 2 O 8.10%, total available nutrients (N+P 2 o 5 +K 2 O)=25.15%, the moisture content of the fertilizer is 2.49%, the strength is 15 Newtons, and the pelleting rate is over 90%.

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Abstract

A process for preparing granular composition N-P-K fertilizer directly from urea solution includes such steps as spraying the 65-99.7% urea solution at 80-140 deg.c onto base N-P-K fertilizer, granulating, drying, cooling and screening. Its advantages include simple process, low cost, high granule forminig rate and productivity, and high and stable quality.

Description

【Technical field】 [0001] The invention relates to a production method of nitrogen, phosphorus and potassium compound fertilizers, more precisely, relates to a method for directly producing compound fertilizers by mixing and granulating urea solution with basic fertilizers containing nitrogen, phosphorus and potassium. 【Background technique】 [0002] The existing technology for producing compound fertilizers is mainly based on the production of solid basic fertilizer ingredients, that is, the basic fertilizers containing nitrogen, phosphorus, and potassium, such as urea, ammonium phosphate, and potassium chloride, are respectively crushed, and then respectively metered and then fed into the mixer. The mixed material is sent to the drum granulator through the bucket elevator, and the material is rotated by the cylinder in the granulator to form a continuously rolling fluidized bed, and steam nozzles are buried in the rolling fluidized bed to flow to the granulator. The materia...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05G1/00C05G3/00
CPCC05G3/0041C05G1/00C05G5/30
Inventor 朱东明
Owner SHANGHAI RES INST OF CHEM IND
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