CN101857476A - Method for preparing compound fertilizer by adopting low-temperature fertilizer slurry pelleting - Google Patents
Method for preparing compound fertilizer by adopting low-temperature fertilizer slurry pelleting Download PDFInfo
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- CN101857476A CN101857476A CN201010174911A CN201010174911A CN101857476A CN 101857476 A CN101857476 A CN 101857476A CN 201010174911 A CN201010174911 A CN 201010174911A CN 201010174911 A CN201010174911 A CN 201010174911A CN 101857476 A CN101857476 A CN 101857476A
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Abstract
The invention relates to a method for preparing a compound fertilizer by adopting low-temperature fertilizer slurry pelleting. The method is characterized by adding potassium chloride or ammonium chloride in the process of preparing the fertilizer slurry by mixing fused solid urea or urine with solid monoammonium phosphate, sylvite or other fillers to prepare mixed slurry with good flowability at lower temperature. The method can reduce the production of biuret in the secondary processing course, ensure that a spraying and pelleting process can be performed at lower temperature and reduce the temperature of the product at the tower bottom. In addition, part ammonium chloride is used to replace the urea and the filler, thereby the mixed slurry with better flowability can be formed with the same nutrition content, and the proportion of nitrogen, phosphor and potassium can be adjusted in a larger range.
Description
Technical field
The present invention relates to the method for melt tower type prilling particulate state composite fertilizer, relate to a kind of method that adopts the low temperature slurry pelleting to prepare NPK compound fertilizer or rather.
Background technology
Fused mass granulating is one of production method of composite fertilizer, be applied to the granulation of monoammonium phosphate (MAP), nitric acid ammonium phosphate (APN), urea ammonium phosphate fertilizer such as (UAP) the earliest, in these production methods, add sylvite or other solid materials production granular nitrogen PK compound fertilizer product in the plain material of the nitrogen of molten state or phosphorus.The characteristics of fused mass granulating technique are that material is in high temperature fused state, and water content is very low, and flowable melt directly sprays in the refrigerant, and material is solidified into spheroidal particle when cooling; Perhaps flowable melt sprays on the interior returning charge particle of mechanical granulator, makes it to be coated with or to be bonded to satisfactory particle at tiny particle surface.The fused mass granulating technique drying-free has been saved investment and energy consumption.
(chemical fertilizer industry .1999,26 (1): 31) once having reported with urea, monoammonium phosphate, Repone K is raw material, adopts the laboratory results of melting granulating technology system nitrogen phosphorus potassium ternary compound fertilizer material in Shanghai Chemical Research Inst.This experimental study the feasibility of technology, urine concentration, mixed solution mixing temperature, the residence time etc. are tested the influence of molten mixture flowability, and have determined suitable process conditions.This technology had realized through engineering approaches in 2004.
The principal element that influences melting granulating technology composite fertilizer quality product is the biuret in the product, and too high Biuret Content can be to the generation serious harm of growing of farm crop.Generally speaking, the biuret in the composite fertilizer is to be brought into by raw material urea, adopts conventional granulation process that fertilizer is carried out secondary processing, because prilling temperature is not high, can not produce new biuret again in granulation process.But, for the higher technology of prilling temperatures such as melting method, if prilling temperature near or surpass the urea fusing point, will further produce biuret and cause Biuret Content raising in the fertilizer product, and the formation speed and the temperature and time of biuret are closely related, temperature is high more, and the formation speed of biuret is fast more.Therefore, adopt fused mass granulating technique to carry out the fertilizer secondary processing, control does not generate or the generation that reduces biuret just seems particularly important.
Chinese patent CN1398826A provides in a kind of melt oil cooling granulation process urine and to have added the method that SODIUMNITRATE or Repone K are made the low temperature slip, but SODIUMNITRATE since price is higher and when mixing with urea the mixture rerum natura very poor, in fact do not have practical value.
Summary of the invention
The purpose of this invention is to provide a kind of method that adopts the low temperature slurry pelleting to prepare composite fertilizer.
The inventive method is to be mixed in the process of fusion fertilizer slurry at solid urea fusion or urea melt and monoammonium phosphate, sylvite and other weighting agent, add Repone K or ammonium chloride, at a lower temperature fusing urea or generate the fertilizer slurry of good fluidity at a lower temperature.The inventive method can reduce the biuret growing amount in the product, and the sprinkling pelleting process is carried out at a lower temperature, reduces the bottom product temperature.Replace urea with part ammonium chloride, can also under same nutrient content, form mobile better fertilizer slurry, adjust the nitrogen phosphoris and potassium fertilizer ratio of product in larger scope.
The principle of the inventive method is: the characteristics that can form eutectic mixture according to urea and Repone K or ammonium chloride, in the solid urea melting process, add Repone K or ammonium chloride, solid urea is a melting below melting temperature (132.7 ℃), or become in the melting charge slurry process to add ammonium chloride with other additives mixed with solid phosphorus ammonium, sylvite at fusing urea, slip still has good flowability under than the low temperature of existing technology (115～130 ℃ of mixed slurry temperature).
Because partial nitrogen source comes from ammonium chloride in the mixed slurry, the nitrogen content of ammonium chloride has only 25%, far below 46% of urea.Can reduce the solid filling dose of adjusting nutrients ratio in identical nutrient prescription, the slip amount of liquid phase increases, and can form mobile better mixing slip; Or under identical amount of liquid phase, nitrogen content reduces, and can adjust the nitrogen phosphoris and potassium fertilizer ratio of product in larger scope, and nitrogen content is when 18% left and right sides, and slip still has good mobility, can satisfy the requirement of melt tower granulation spray equipment to the slip flowability.
The present invention realizes like this.A kind of method that adopts the low temperature slurry pelleting to prepare composite fertilizer of the present invention comprises and is prepared as follows step:
(1) urea heats generation melt material slip with a small amount of Repone K or ammonium chloride down at 110～130 ℃, described urea and Repone K and (or) weight ratio of ammonium chloride is 1: (0.05～0.2), in above-mentioned slip, add monoammonium phosphate, sylvite and weighting agent again, heating is mixed and made into the low temperature fertilizer slurry, described urea: monoammonium phosphate: the weight ratio of sylvite is (1～5): 1: (1～3), described weighting agent add-on is 0%～25 weight % of fertilizer total amount, and described low temperature fertilizer slurry mixing temperature is controlled at 90～115 ℃; Or
(2) urea melt mixes with monoammonium phosphate, sylvite and weighting agent heating, add a certain amount of ammonium chloride in the mixing process, make the low temperature fertilizer slurry, described urea: monoammonium phosphate: the weight ratio of sylvite is (1～5): 1: (1～3), the add-on of described weighting agent is 0%～25 weight % of fertilizer total amount, the add-on of described ammonium chloride is the 5 weight %～20 weight % of urea amount, and described slip mixing temperature is 90～115 ℃;
(3) the low temperature fertilizer slurry that step (1) or step (2) are made promptly obtains the particulate state composite fertilizer by fused mass granulating device sprinkling pelleting in prilling tower.
The described sylvite of the inventive method is a kind of in Repone K or the vitriolate of tartar.
The described urea melt of the inventive method is that temperature that factory that makes urea produces is 135～142 ℃, concentration greater than 99% urea melt, the perhaps urea melt behind the solid urea heating and melting.
The described weighting agent of the inventive method is one or more in ground dolomite, limestone powder, calcite in powder or the Paris white.
The granularity of the described solid materials of the inventive method is less than 1.0 millimeters.
The inventive method compared with prior art has the following advantages:
1, reduces the solid urea melt temperature, reduce the generation of objectionable impurities biuret;
2, partial nitrogen source comes from ammonium chloride, has reduced filling dose in identical nutrient prescription, and amount of liquid phase increases, and can form mobile better mixing slip, helps sprinkling pelleting;
3, substitute urea as nitrogenous source with part ammonium chloride, make that slip still has flowability under lower nitrogen content, sprinkling pelleting is successfully adjusted the nitrogen phosphoris and potassium fertilizer ratio of fused mass granulating technique product in larger scope;
4, melt-mixing slip temperature of charge reduces by 10～20 ℃, and the sprinkling pelleting process can be carried out at a lower temperature, has reduced the particle temperature that falls at the bottom of the tower, helps product appearance.
Embodiment
In order to set forth the present invention better, the present invention is described in further detail now to enumerate following embodiment, but the present invention is not limited to following examples; Degree in following examples is weight %.
Embodiment 1
Solid urea 300 grams, solid Repone K 45 grams, being heated to 130 ℃ becomes fused solution, and granularity restrains less than 1.0 millimeters monoammonium phosphate 150, Repone K 105 grams, ground dolomite 40 grams join in the fused solution, mixed 2～3 minutes, and made the low temperature fertilizer slurry, 90～105 ℃ of slurry temperatures.With the above-mentioned low temperature fertilizer slurry of making, disperse to become small droplets by prilling granulator, from highly being to fall 50 meters the prilling tower, conduct heat and mass transfer with upstream, cool off and be cured as 1～4 millimeter pellet, obtain containing N 24.0%, P
2O
510.2%, K
2O 14.1%, H
2The NpK complex fertilizer of O0.3%, Biuret Content 0.8% in the product.
Embodiment 2
Solid urea 200 grams, solid ammonium chloride 35 grams, being heated to 115 ℃ becomes fused solution, granularity restrains less than 1.0 millimeters monoammonium phosphate 180, vitriolate of tartar 160 grams, limestone powder 20 grams join in the fused solution, mixed 2～3 minutes, 100～115 ℃ of slurry temperatures, the slip that contains suspended solid becomes drop from highly being to fall 50 meters the prilling tower by Fitz chilsonator, conducts heat and mass transfer with upstream, cooling also is cured as 1～4 millimeter pellet, obtains containing N 21.5%, P
2O
514.0%, K
2O 14.1%, H
2The NpK complex fertilizer of O 0.4%, Biuret Content 0.7% in the product.
Embodiment 3
Solid urea 200 grams, solid ammonium chloride 10 grams, solid Repone K 10 grams, be heated to 120 ℃ and become fused solution, granularity restrains less than 1.0 millimeters monoammonium phosphate 150, Repone K 135 grams, Paris white 40 grams, join in the fused solution, mixed 2～3 minutes, 95～105 ℃ of slurry temperatures, the slip that contains suspended solid becomes drop from highly being to fall 50 meters the prilling tower by Fitz chilsonator, conduct heat and mass transfer with upstream, cool off and be cured as 1～4 millimeter pellet, obtain containing N 20.2%, P
2O
511.9%, K
2O 15.8%, H
2The NpK complex fertilizer of O 0.3%, Biuret Content 0.9% in the product.
Embodiment 4
Solid urea 300 grams, solid ammonium chloride 60 grams, solid Repone K 45 grams, being heated to 110 ℃ becomes fused solution, granularity restrains less than 1.0 millimeters monoammonium phosphate 350, and Repone K 250 grams join in the fused solution, mixed 2～3 minutes, and made the low temperature fertilizer slurry, 105～115 ℃ of slurry temperatures.With the above-mentioned low temperature fertilizer slurry of making, disperse to become small droplets by prilling granulator, from highly being to fall 50 meters the prilling tower, conduct heat and mass transfer with upstream, cool off and be cured as 1～4 millimeter pellet, obtain containing N 18.2%, P
2O
514.2%, K
2O 16.3%, H
2The NpK complex fertilizer of O0.3%, Biuret Content 0.8% in the product.
Embodiment 5
Get urea plant flash evaporator outlet urea soln 300 grams, concentration is greater than 99%, about 140 ℃ of temperature, the adding granularity restrains less than 1.0 millimeters monoammonium phosphate 250 grams, Repone K 178 grams, ammonium chloride 75, mixed about 2 minutes, 105～115 ℃ of slurry temperatures, the slip that contains suspended solid becomes drop from highly being to fall 40 meters the prilling tower by Fitz chilsonator, conduct heat and mass transfer with upstream, cooling also is cured as 1～4 millimeter pellet, be granular nitrogen phospho potash complex fertilizer product, this product contains N 22.6%, P
2O
513.7%, K
2O 13.5%, H
2O 0.4%, and Biuret Content 0.5% in the product.
Embodiment 6
Get urea plant flash evaporator outlet urea soln 300 grams, concentration is greater than 99%, about 140 ℃ of temperature, the adding granularity restrains less than 1.0 millimeters monoammonium phosphate 300 grams, Repone K 258 grams, ammonium chloride 25, calcite in powder 50 grams mixed about 3 minutes, 90～105 ℃ of slurry temperatures, the slip that contains suspended solid becomes drop from highly being to fall 40 meters the prilling tower by Fitz chilsonator, conduct heat and mass transfer with upstream, cooling also is cured as 1～4 millimeter pellet, be granular nitrogen phospho potash complex fertilizer product, this product contains N18.8%, P
2O
514.1%, K
2O 16.5%, H
2O 0.3%, and Biuret Content 0.5% in the product.
Claims (5)
1. method that adopts the low temperature slurry pelleting to prepare composite fertilizer is characterized in that this method comprises to be prepared as follows step:
(1) urea heats generation melt material slip with a small amount of Repone K or ammonium chloride down at 110～130 ℃, the weight ratio of described urea and Repone K or ammonium chloride is 1: 0.05～0.2, in above-mentioned slip, add monoammonium phosphate, sylvite and weighting agent again, heating is mixed and made into the low temperature fertilizer slurry, described urea: monoammonium phosphate: the weight ratio of sylvite is 1～5: 1: 1～3, described weighting agent add-on is 0%～25 weight % of fertilizer total amount, and described low temperature fertilizer slurry mixing temperature is controlled at 90～115 ℃; Or
(2) urea melt mixes with monoammonium phosphate, sylvite and weighting agent heating, add a certain amount of ammonium chloride in the mixing process, make the low temperature fertilizer slurry, described urea: monoammonium phosphate: the weight ratio of sylvite is 1～5: 1: 1～3, the add-on of described weighting agent is 0%～25 weight % of fertilizer total amount, the add-on of described ammonium chloride is the 5 weight %～20 weight % of urea amount, and described slip mixing temperature is 90～115 ℃;
(3) the low temperature fertilizer slurry that step (1) or step (2) are made promptly obtains the particulate state composite fertilizer by the granulation in prilling tower of fused mass granulating device.
2. method according to claim 1 is characterized in that: described sylvite is a kind of in Repone K or the vitriolate of tartar.
3. method according to claim 1 is characterized in that: described urea melt is that temperature that factory that makes urea produces is 135～142 ℃, the concentration urea melt greater than 99 weight %, the perhaps urea melt behind the solid urea heating and melting.
4. method according to claim 1 is characterized in that: described weighting agent is one or more in ground dolomite, limestone powder, calcite in powder or the Paris white.
5. according to the described method of claim 1-4, it is characterized in that: the granularity of described solid materials is less than 1.0 millimeters.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102584395A (en) * | 2012-02-15 | 2012-07-18 | 瓮福（集团）有限责任公司 | Method for producing urea-based compound fertilizer by high tower granulation |
| CN102701846A (en) * | 2012-05-28 | 2012-10-03 | 徐州市芭田生态有限公司 | Method for controlling content of biuret in compound fertilizers for melt granulation in prilling tower |
| CN104788164A (en) * | 2015-04-21 | 2015-07-22 | 苏州市新泾村农业基地专业合作社 | Special fertilizer for strawberries as well as preparation method and fertilizing method of fertilizer |
| CN108069879A (en) * | 2016-11-17 | 2018-05-25 | 湖北富来地金润肥业有限公司 | Potassium chloride reduces the preparation method of urea fusing point |
-
2010
- 2010-05-13 CN CN201010174911A patent/CN101857476A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102584395A (en) * | 2012-02-15 | 2012-07-18 | 瓮福（集团）有限责任公司 | Method for producing urea-based compound fertilizer by high tower granulation |
| CN102701846A (en) * | 2012-05-28 | 2012-10-03 | 徐州市芭田生态有限公司 | Method for controlling content of biuret in compound fertilizers for melt granulation in prilling tower |
| CN104788164A (en) * | 2015-04-21 | 2015-07-22 | 苏州市新泾村农业基地专业合作社 | Special fertilizer for strawberries as well as preparation method and fertilizing method of fertilizer |
| CN108069879A (en) * | 2016-11-17 | 2018-05-25 | 湖北富来地金润肥业有限公司 | Potassium chloride reduces the preparation method of urea fusing point |
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Application publication date: 20101013 |