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Method for preparing composite fertilizer by smelting solid material

A compound fertilizer and solid material technology, which is applied in the direction of fertilizer form, fertilizer mixture, fertilization device, etc., can solve the problems of difficult dust removal of tail gas, large drying load, high granulation water content, etc., and achieves easy installation and maintenance, high granulation temperature , the effect of high ball forming rate

Inactive Publication Date: 2007-11-28
SHANGHAI RES INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the granulation method is relatively simple, it is difficult to remove dust from the tail gas due to the high moisture content of granulation, large drying load, and easy sticking to the copying board.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Take 380kg of urea melt or melt from the outlet of the second-stage evaporator of the urea plant, the concentration is greater than 99%, and the temperature is 135°C, and add it to the mixing tank with steam coil, 225kg of monoammonium phosphate and 200kg of potassium sulfate preheated to 115°C and filler dolomite 220kg, then sent to the drum granulator for granulation, the material after granulation is cooled and sieved to be a high-concentration granular nitrogen, phosphorus and potassium compound fertilizer. This product contains 20% by weight of N, P 2 o 5 15% by weight, K 2 O10% by weight, moisture 0.5% by weight, the grain strength of the product is greater than 25 Newton / grain.

Embodiment 2

[0022] Take 600kg of solid urea and put it into the melting tank for melting, the melting temperature is 135°C, then add 200kg of monoammonium phosphate preheated to 100°C, 150kg of potassium chloride and 50kg of filler stone powder to mix, and the mixed slurry is sprayed into the rotary tank with a pump Granulate in a drum granulator, and the granulated material is cooled and screened to obtain a high-concentration granular nitrogen, phosphorus, and potassium compound fertilizer. The product contains 30% by weight of N, P 2 o 5 Weight 10% by weight, K 2 O 9% by weight, moisture 0.5% by weight, the particle strength of the product is greater than 25 Newton / grain.

Embodiment 3

[0024] Take 400kg of ammonium nitrate melt at the outlet of the evaporator of the ammonium nitrate factory, the concentration is greater than 95%, and the temperature is 120°C, add it to the mixing tank and mix it with 300kg of monoammonium phosphate pre-heated to 110°C, 250kg of potassium chloride and 50kg of filler clay. Use a pump to spray the corresponding ratio of the returned material, and after coating and granulation, cool and sieve to obtain a high-concentration granular nitrogen, phosphorus, and potassium compound fertilizer. The product contains 15% by weight of N, P 2 o 5 15% by weight, K 2 O 15% by weight, moisture 1.5% by weight, the particle strength of the product is greater than 30 Newton / grain.

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PUM

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Abstract

The process of smelting solid material to produce composite fertilizer includes the following steps: mixing base material and stuffing crushed to below 2.0 mm, preheating the mixture and adding to molten urea or ammonium nitrate solution through stirring for 3-8 min to produce melt slurry, maintaining the temperature of the slurry at 100-130 deg.c, spraying the slurry with a pump to solid material containing recycled material or partial phosphate or potassium salt to pelletize, sieving to obtain the composite fertilizer product, and returning the fine powder and large grains. The present invention has the features of simple technological process, low cost, environment friendship, etc.

Description

technical field [0001] The invention relates to the production of an agricultural compound fertilizer, in particular to a production method of solid material melting drum granulation compound fertilizer. Background technique [0002] The production method of existing compound fertilizer mainly adopts slurry method, agglomerate method, high tower spray method etc. The slurry method is mostly prepared by reacting high-concentration phosphoric acid and ammonia. It is characterized by complex processes and equipment, difficult production technology, and huge investment. The conditions for plant construction are harsh and the construction period is long. Put it on solid objects, because urea alone has a high melting point, if it is dissolved in water, it will easily cause high moisture in the fertilizer and needs to be dried. The melt method is to use the urea (or ammonium nitrate) solution (concentration ≥ 95%) evaporated in the second stage of the urea (or ammonium nitrate) pr...

Claims

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Application Information

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IPC IPC(8): C05G1/00C05G3/00C05G5/00
Inventor 朱东明张伟杨焕银段立松吴爱国
Owner SHANGHAI RES INST OF CHEM IND
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