Method for producing composite fertilizer needed no drying

A technology of compound fertilizer and production method, which is applied to fertilizer forms, fertilizer mixtures, fertilization devices, etc., can solve problems such as inapplicability of high-concentration compound fertilizers, problems in metering and conveying, and inapplicability to industrialized production, etc., so as to save investment and The effect of production cost, not easy to agglomerate, convenient storage and transportation

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

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the amount and concentration of sulfuric acid is low, and the granulation temperature of 30-40°C cannot achieve the purpose of evaporating water at all, so it is not suitable for the production of high-concentration compound fertilizer, which has its limitations.
[0004] Chinese patent application CN146395A discloses a method for granulating inorganic compound fertilizers. This method is to add a small amount of concentrated sulfuric acid to urea solids and then melt them.
And due to the existence of foam, there are problems in metering and transportation, so it is not suitable for industrial production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Take 55 kg of concentrated sulfuric acid and add water to make a 60% concentration of sulfuric acid solution, and spray it with 15 kg of gaseous ammonia into a mixture containing 350 kg of ammonium chloride, 100 kg of potassium sulfate, 220 kg of heavy calcium, and 260 kg of kaolin for granulation. The granulated material can be sieved to contain N10%, P 2 o 5 10%, K 2 O5% low-concentration compound fertilizer product, the moisture content of the product is 4.5%.

Embodiment 2

[0023] Take 300 kg of concentrated sulfuric acid with a concentration of 93%, spray it together with 100 kg of gaseous ammonia into granules containing 250 kg of potassium chloride, 330 kg of monoammonium phosphate, and 120 kg of bentonite, cool and sieve to obtain N17%. P 2 o 5 15%, K 2 O15% high-concentration compound fertilizer product, the particle strength of the product is greater than 20 Newton / grain.

Embodiment 3

[0025] Take 200 kg of concentrated sulfuric acid with a concentration of 85%, spray it together with 60 kg of gaseous ammonia into 200 kg of potassium chloride, 200 kg of diammonium phosphate, and 340 kg of phosphogypsum to granulate, cool and sieve to obtain a compound fertilizer product, the product specification contains N-P 2 o 5 -K 2 O=12-10-12. The grain strength is greater than 15 Newton / grain.

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PUM

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Abstract

The complex fertilizer producing process without need of drying step includes the following steps: pelletizing the solid material in a pelletizing machine, spraying 60-98 wt % concentration sulfuric acid solution into the pelletized material, adding liquid ammonia or gaseous ammonia for reaction to release heat for pelletizing, cooling and sieving to obtain pelletized complex fertilizer product. The process has the reaction heat well utilized, and has high pelletizing temperature, high balling degree, raised production capacity, lowered cost and saving in power.

Description

technical field [0001] The invention relates to a production method of granular compound fertilizer, more precisely relates to a production method of compound fertilizer without drying. Background technique [0002] Most of the existing compound fertilizers are produced with solid raw materials, that is, the basic raw materials containing nitrogen, phosphorus, and potassium are mixed and sent to the granulator. The materials are agglomerated into granules in the granulator, and the granulated materials are directly transported to Dried in a drying kiln, the dried material is cooled and screened to obtain qualified products. The production process of this technology is simple, and the operation is easy to master, but there are defects such as high moisture required when the material is granulated, large drying load, and low granule strength. [0003] Chinese patent application CN1172095A discloses a method for granulating inorganic compound fertilizers. The method is to spra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G5/00C05G1/00
Inventor 杨焕银朱东明张伟段立松吴爱国
Owner SHANGHAI RES INST OF CHEM IND
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