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Low-temperature melt process of producing granulated azophoska

A compound fertilizer and a technology for manufacturing granules, applied in the direction of liquid separation into beads and granules, fertilizer forms, fertilizer mixtures, etc., can solve the problems of high ammonia escape rate in biuret content, achieve good water solubility, not easy to agglomerate, and save investment The effect of low cost and operating costs

Inactive Publication Date: 2003-02-26
俞政
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a manufacturing method of low-temperature melt granulation granular nitrogen, phosphorus and potassium compound fertilizer, which overcomes the problem of agglomeration caused by solid ammonium phosphate heating and biuret caused by excessive temperature of the melt material High content, high ammonia escape rate in the mixing process, etc., and greatly reduce the energy consumption of the production process, and the ratio of nitrogen, phosphorus and potassium fertilizers can be adjusted within a certain range, which can produce granular nitrogen, phosphorus and potassium compound fertilizers, and can also produce Nitrogen, phosphorus and nitrogen and potassium compound fertilizers to meet the nutritional needs of different crops

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Take 200 grams of urea solution or melt at the outlet of the second-stage evaporator of the urea plant, the concentration is greater than 99%, and the temperature is about 140 ° C, add 36 grams of solid sodium nitrate and 180 grams of white potassium chloride with a particle size of less than 0.5 mm, and add acid blue dye at the same time 0.08 g, stir and mix for about 1 minute, the slurry temperature is 90-105°C, and 116 g of solid ammonium phosphate with a particle size of less than 0.5 mm is added to the above slurry, and mixed for 1-5 minutes, the material containing ammonium phosphate and potassium chloride suspension The slurry falls into the oil-cooled tank with an oil temperature of 25-45°C through the granulator, cools and solidifies into small pellets of 1-4 mm, and the oil-containing granular fertilizer is separated from most of the oil by a centrifuge to obtain blue Color granular NPK compound fertilizer product, the product contains N 20.6%, P 2 o 5 9.6%,...

Embodiment 2

[0029] Take 200 grams of urea solution at the outlet of the second-stage evaporator of the urea plant, with a concentration of about 99% and a temperature of about 140°C, add 6 grams of solid sodium nitrate and 140 grams of red potassium chloride with a particle size of less than 0.5 mm, stir and mix for about 1 minute, and the slurry The temperature is 90-105°C, the slurry falls into the oil cooling tank with an oil temperature of 25-45°C through the granulator, cools and solidifies into small pellets of 1-4 mm, and the oily granular fertilizer is separated by a centrifuge. After most of the oil is obtained, a red granular nitrogen-potassium compound fertilizer product is obtained, which contains 26.6% of N, P 2 o 5 0%, K 2 O 24.3%, moisture 0.8%, the particle strength of the product is greater than 15 Newton / particle.

Embodiment 3

[0031] 300 grams of solid urea, 48 grams of solid sodium nitrate, heated to 100 ° C to become a molten liquid, 200 grams of ammonium phosphate with a particle size of less than 0.5 mm, 3 grams of boric acid, 9 grams of magnesium sulfate heptahydrate, added to the molten material, stirred and mixed for 1 ~ For 5 minutes, the slurry temperature is 80-95°C, and the slurry containing ammonium phosphate solid suspension is dropped into the oil cooling tank with an oil temperature of 25-45°C through the granulator, cooled and solidified into small balls of 1-4 mm Granular, oil-containing granular fertilizers are separated by a centrifuge to remove most of the oil, and the obtained fertilizers contain 30.6% N, P2 o 5 A nitrogen-phosphorus compound fertilizer with 16.1% and 0.50% water content, the fertilizer contains magnesium, sulfur, medium elements and trace elements boron, and the particle strength of the product is greater than 20 Newtons per particle.

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Abstract

The present invention is a low-temperature melt process for producing granulated azophoska. Melt material is first produced through mixing semi-finished product solid urea with sodium nitrate or potassium chloride or heating solid urea and sodium nitrate or potassium chloride, then it is mixed with solid ammonium phosphate to produce suspension melt slurry. The mixed melt slurry is dispersed into small liquid drops through a prilling granulator, and the small liquid drops are cooled, solidified in an oil cooling tank and separated to obtain the product. The said process may be also used in producing trace element fertilizer or color fertilizer. The said process has greatly lowered melt material temperature, no need of heating solid ammonium phosphate, simple production process, low cost, and no environmental pollution.

Description

technical field [0001] The invention relates to a method for producing granular nitrogen, phosphorus and potassium compound fertilizers, more precisely, relates to a method for producing granular nitrogen, phosphorus and potassium compound fertilizers by adopting a low-temperature melt method. Background technique [0002] In the prior art, "Chemical Fertilizer Handbook" (China Foreign Translation and Publishing Company, 1984, compiled by the United Nations Industrial Development Organization) reported that in 1968, the Tennessee Valley Authority (TVA) of the United States demonstrated the oil immersion of the urea-ammonium polyphosphate mixture. Granulation tower granulation method (Oil prilling). In this method, the ammonium polyphosphate melt is pre-mixed with the urea melt in a tank and then enters the rotating granulation cup. The temperature of the mixed slurry is about 132°C, and the slurry drops from the granulation cup are cooled. And collected in light oil, this l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J2/02C05G1/00C05G5/00
Inventor 俞政
Owner 俞政
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