CN1948232A - Method of tower type pelletizing manufacturing composite mixed fertilizer - Google Patents
Method of tower type pelletizing manufacturing composite mixed fertilizer Download PDFInfo
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- CN1948232A CN1948232A CN 200610025186 CN200610025186A CN1948232A CN 1948232 A CN1948232 A CN 1948232A CN 200610025186 CN200610025186 CN 200610025186 CN 200610025186 A CN200610025186 A CN 200610025186A CN 1948232 A CN1948232 A CN 1948232A
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Abstract
The present invention relates to a method for making complex mixed fertilizer by utilizing tower-type granulation process. Said method includes the following steps: heating and mixing urea melt, phosphamidom, potassium salt and filling agent to obtain fertilizer slurry, the weight ratio of urea, phosphamidom and potassium salt is 1-5:1:1-3, the filling agent content is 0-25% of total weight of said fertilizer, the slurry temperature is 100-135 deg.C, then feeding said mixed fertilizer slurry into the granulating device positioned in the top portion of granulation tower, utilizing said granulating device to make the fertilizer slurry be dispersed into small liquid drops, making said small liquid drops be fallen and contacted with cold air, cooled and solidified so as to obtain the invented granular complex mixed fertilizer.
Description
Technical field
The present invention relates to a kind of manufacture method of granular nitrogen PK compound fertilizer, relate to a kind of method that adopts fertilizer slurry to make particle azophoska fertilizer by tower granulation or rather.
Background technology
Composite fertilizer is the inexorable trend of chemical fertilizer industrial development in modern age, has accounted for 70%～80% of total fertilizer application amount in the country of chemical fertilizer industry prosperity.The production method of composite fertilizer has granulating method, slurry process, melting method, extrusion process and blending method etc., and they are that base fertilizer such as urea, ammonium chloride, coarse whiting, phosphorus ammonium, Repone K, vitriolate of tartar etc. are carried out the high concentration compound fertilizer that secondary processing is made various nutrient elements such as containing nitrogen, phosphorus, potassium.China's composite fertilizer production is based on granulating method.
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 (refrigerant is air or the undissolved liquid of melt material normally, as the mineral wet goods), 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 evaporation of solution or concentrate no doubt requires the expenditure of energy, but effective far beyond the dried particles product aspect utilizing at energy, can also make full use of reaction heat still more and come evaporation section even whole moisture in some production technique.General granulation process, drying plant are normally maximum and be the equipment the most expensive, that energy consumption is the highest in the production equipment, and the fused mass granulating technique drying-free has been saved investment and energy consumption.
Prilling tower sprinkling pelleting process application is the granulation of single nitrogenous fertilizer (as urea, ammonium nitrate etc.) the earliest, the most widely, has now expanded the granulation of nitrogen phosphorus and NpK complex fertilizer to.Prilling tower has circular and square two kinds, and in the majority with circle.Look actual conditions in the tower and can adopt natural ventilation or forced ventilation.The virtual height of tower is decided according to the drop cooling curing required time of melt, so relevant with material characteristic, size of particles and draft type etc.Granulating equipment has rotating sprinkler and oscillatory type shower nozzle two classes, and the latter is mainly used in square tower.
It is raw material that Shanghai Chemical Research Inst's (" chemical fertilizer industry ", 1999 the 1st phases) had once reported with urea, monoammonium phosphate, Repone K, adopts the multiple fertile laboratory results of melting granulating technology system NPK ternary.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 determined suitable process conditions.
Chinese patent CN200410099036.6 discloses a kind of tower granulation production NPK compound fertilizer method, in the method, solid materials such as phosphorus ammonium, sylvite and weighting agent are by the melts medial launder of solids raised equipment lifting to the prilling tower top, mix sprinkling pelleting with urine then.Owing to installing and having used the solid powder lift technique, increased the design difficulty and the construction investment of prilling tower, maintenance of equipment work amount increases, and has also worsened operating environment sometimes.
Summary of the invention
The method that the purpose of this invention is to provide a kind of novel employing tower type pelletizing manufacturing composite mixed fertilizer, the inventive method adopts whole fertilizer slurries with the method for pump delivery to the prilling tower top, got rid of with solids raised equipment with solid materials be promoted to the prilling tower top again with the step of urea soln melting mixing, alleviate the design pressure of prilling tower, saved the laid down cost of prilling tower.
The present invention realizes like this.The method of a kind of tower type pelletizing manufacturing composite mixed fertilizer of the present invention comprises following manufacturing step:
(1) factory that makes urea's concentration is greater than the urea melt of 99 weight % or the urea melt behind the solid urea heating and melting, and temperature is 135～145 ℃,
(2) granularity is less than 1 millimeter sylvite, weighting agent and phosphorus ammonium, separately or be heated to 80～140 ℃ together,
(3) with urea melt with the heating after phosphorus ammonium and sylvite mixed 1～5 minute at the melts medial launder, generation contains the mixed fertilizer slip of phosphorus ammonium and sylvite suspended substance, the weight ratio of urea and phosphorus ammonium, sylvite is 1～5 in the mixed fertilizer slip: 1: 1～3, the add-on of weighting agent is 0～25% of a fertilizer total amount weight percentage, the mixed fertilizer slurry temperature is 100～135 ℃
(4) with the mixed fertilizer slip with the prilling granulator of pump delivery to the prilling tower top,
(5) the mixed fertilizer slip is separated into small droplets by prilling granulator, and small droplets lands under gravity and buoyancy, contacts with the cold air flow that enters under tower is reverse, produces the heat and mass effect each other, cools off and is cured as the particulate state composite fertilizer.
Method of the present invention, described mixed fertilizer slip transferpump are to be suitable for containing impeller pump or the volumetric pump that solid materials is carried.
Method of the present invention, described phosphorus ammonium is a monoammonium phosphate, and described sylvite is Repone K or vitriolate of tartar, and described weighting agent is a granularity less than 0.5 millimeter ground dolomite or Paris white.
Method of the present invention, described prilling tower are cylindrical reinforced concrete or steel structure tower, and draft type is natural ventilation or forced ventilation, and the virtual height of tower is 30～90 meters, and the internal diameter of tower is 10～24 meters.Described forced ventilation mode is in prilling tower top installation shaft flow fan exhausting.
Method of the present invention, described prilling granulator are meant rotary differential shower nozzle.
Method of the present invention, when preparation mixed fertilizer slip, add moderate-element compound or trace compound, be mixed together, make the mixed fertilizer slip that contains moderate-element compound or trace compound with urea melt and phosphorus ammonium and sylvite.Described moderate-element compound is one or more the mixture in calcium cpd, magnesium compound or the sulphur compound; Described trace compound is one or more the mixture in boron compound, copper compound, iron cpd, manganic compound, molybdenum compound or the zn cpds.
Method of the present invention, described moderate-element compound are one or more the mixtures in calcium sulfate, nitrocalcite, sal epsom, potassium magnesium sulfate or the sulphur; Described trace compound is one or more the mixture in copper sulfate, cupric oxide, ammonium molybdate, Sodium orthomolybdate, boric acid, borax, ferrous sulfate, chelated iron, zinc sulfate, zinc oxide, zinc chloride, manganous sulfate, manganese oxide or the Manganous chloride tetrahydrate.
The present invention compared with prior art has following advantage: the inventive method adopts pump delivery blended fusion fertilizer slurry, has simplified technical process, has saved investment.And adopt pump delivery blended fusion fertilizer slurry, do not need to carry out very big input and can be implemented in the production of carrying out urea-base composite fertilizer on the existing urea prilling tower.
Embodiment
In order to implement the present invention better, the present invention is further illustrated especially exemplified by going out following examples, but enforcement of the present invention is not limited to following examples.
Embodiment 1
Get urea plant flash evaporator outlet urea soln or melt 200 grams, concentration is greater than 99 weight %, about 140 ℃ of temperature, the adding granularity is less than 1.0 millimeters and be preheated to about 105 ℃ monoammonium phosphate 100 grams, white Repone K 58 grams, mixed about 2 minutes, 115～120 ℃ of slurry temperatures, the mixed fertilizer slip that contains suspended solid with pump delivery to the prilling tower top, disperseing to become drop by prilling granulator falls, conduct heat and mass transfer with upstream, cooling also is cured as 1～4 millimeter pellet, is granular nitrogen PK compound fertilizer product.Prilling tower is the cylindrical reinforced concrete structural tower, 40 meters of the virtual heights of tower, 10 meters of tower internal diameters.Fertilizer product contains N 28.5%, P
2O
512.1%, K
2O 9.5%, H
2O 0.3%, the granule strength of product greater than 25 newton/.
Embodiment 2
Get urea plant flash evaporator outlet urea soln 200 grams, concentration 99 weight %, about 135 ℃ of temperature, add granularity respectively less than 1.0 millimeters and be preheated to about 110 ℃ monoammonium phosphate 80 gram, granularity less than 1.0 millimeters and be preheated to about 120 ℃ red Repone K 125 gram and granularity less than 0.5 millimeter and be preheated to about 120 ℃ ground dolomite 25 and restrain, mixed about 4 minutes, 120～125 ℃ of slurry temperatures, the mixed fertilizer slip that contains suspended solid with pump delivery to the prilling tower top, disperseing to become drop by prilling granulator falls, conduct heat and mass transfer with upstream, cooling also is cured as 1～4 millimeter pellet, obtain red granules shape composite N-K fertilizer product, prilling tower is the cylindrical reinforced concrete structural tower, 80 meters of the virtual heights of tower, 20 meters of tower internal diameters are in the installation shaft flow fan forced draft of prilling tower top.Fertilizer product contains N 23.1%, P
2O
58.0%, K
2O17.2%, H
2O 0.2%, the granule strength of product greater than 40 newton/.
Embodiment 3
Solid urea 300 grams, be heated to 136 ℃ and become fused solution, granularity restrains less than 1.0 millimeters monoammonium phosphate 150, red Repone K 150 grams, ground dolomite 30 grams, boric acid 3 gram, magnesium sulfate heptahydrate 9 grams, be preheating to about 105 ℃ after, join in the molten urea solution respectively, mixed 2～3 minutes, 110～115 ℃ of slurry temperatures, the mixed fertilizer slip that contains suspended solid is delivered to the prilling tower top with impeller pump, disperseing to become drop by rotary differential shower nozzle falls, 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 13.5%, H
2O 0.3%, red NpK complex fertilizer, this fertilizer contains magnesium, sulphur moderate-element and micronutrient boron.
Embodiment 4
Solid urea 300 grams, Repone K 30 grams, be heated to 120 ℃ and become fused solution, granularity restrains less than 1.0 millimeters monoammonium phosphate 150, white Repone K 100 grams, copper sulfate 4 gram, ammonium molybdate 4 grams, be preheating to about 110 ℃ after, join in the fused solution together, mixed about 2 minutes, about 115 ℃ of slurry temperature, the mixed fertilizer slip that contains suspended solid is delivered to the prilling tower top with volumetric pump, disperseing to become drop by prilling granulator falls, conduct heat and mass transfer with upstream, cool off and be cured as 1～4 millimeter pellet, obtain granular nitrogen-potassium composite fertilizer, prilling tower is the cylindrical steel structural tower, 90 meters of the virtual heights of tower, 24 meters of tower internal diameters are in the installation shaft flow fan forced draft of prilling tower top.This product contains N 26.0%, P
2O
512.6%, K
2O 13.3%, H
2O0.5% contains sulphur moderate-element and trace copper and molybdenum simultaneously.
Embodiment 5
Solid urea 200 grams, being heated to 145 ℃ becomes fused solution, and granularity restrains less than 1.0 millimeters monoammonium phosphate 100, is preheating to about 100 ℃; Granularity is less than 0.5 millimeter vitriolate of tartar 200 gram, calcium sulfate 10 grams, zinc sulfate 4 grams, manganous sulfate 4 grams, be preheating to about 125 ℃ together after; Join in the molten urea solution respectively, after mixing about 2 minutes, 120～135 ℃ of slurry temperatures, the slip that contains suspended solid becomes drop from highly being to fall 70 meters the prilling tower by Fitz chilsonator, conduct heat and mass transfer with upstream, cooling also is cured as 1～4 millimeter pellet, obtains amber granular nitrogen phospho potash complex fertilizer product, and this product contains N 20.1%, P
2O
510.3%, K
2O 19.7%, H
2O 0.25%, contains calcium, sulphur, zinc moderate-element and trace element simultaneously.
Embodiment 6
Solid urea 300 grams, be heated to 140 ℃ and become fused solution, add granularity respectively less than 1.0 millimeters and be preheating to about 100 ℃ monoammonium phosphate 80 gram, granularity less than 1.0 millimeters and be preheating to about 110 ℃ of vitriolate of tartar 200 grams and granularity less than 0.5 millimeter and be preheating to about 110 ℃ of Paris whites 50 and restrain, after mixing about 3 minutes, 110～115 ℃ of slurry temperatures, the slip that contains suspended solid becomes drop from highly being to fall 50 meters the prilling tower by Fitz chilsonator, conduct heat and mass transfer with upstream, cooling also is cured as 1～4 millimeter pellet, obtain the granular nitrogen-potassium composite fertilizer product, this product contains N 22.9%, P
2O
55.4%, K
2O 16.1%, H
2O 0.25%.
Embodiment 7
Solid urea 200 grams, Repone K 10 grams, be heated to 125 ℃ and become fused solution, granularity is less than the 1.O millimeter and be preheating to about 90 ℃ monoammonium phosphate 200 grams, granularity is less than 1.0 millimeters and be preheating to about 130 ℃ of white Repone K 200 grams and ground dolomite 90 grams, join in the molten urea solution respectively, mixed about 4 minutes, 115～120 ℃ of slurry temperatures, the slip that contains suspended solid becomes drop from highly being to fall 30 meters the prilling tower by Fitz chilsonator, conduct heat and mass transfer with upstream, cooling also is cured as 1～4 millimeter pellet, obtains granular nitrogen phospho potash complex fertilizer product, and this product contains N 16.4%, P
2O
513.9%, K
2O 18.2%, H
2O 0.2%.
Claims (9)
1. the method for a tower type pelletizing manufacturing composite mixed fertilizer is characterized in that this method may further comprise the steps:
(1) factory that makes urea's concentration is greater than the urea melt of 99 weight % or the urea melt behind the solid urea heating and melting, and temperature is 135～145 ℃,
(2) granularity is less than 1 millimeter sylvite, weighting agent and phosphorus ammonium, separately or be heated to 80～140 ℃ together,
(3) with urea melt with the heating after phosphorus ammonium and sylvite mixed 1～5 minute at the melts medial launder, generation contains the mixed fertilizer slip of phosphorus ammonium and sylvite suspended substance, the weight ratio of urea and phosphorus ammonium, sylvite is 1～5 in the mixed fertilizer slip: 1: 1～3, the add-on of weighting agent is 0～25% of a fertilizer total amount weight percentage, the mixed fertilizer slurry temperature is 100～135 ℃
(4) with the mixed fertilizer slip with the prilling granulator of pump delivery to the prilling tower top,
(5) the mixed fertilizer slip is separated into small droplets by prilling granulator, and small droplets lands under gravity and buoyancy, contacts with the cold air flow that enters under tower is reverse, produces the heat and mass effect each other, cools off and is cured as the particulate state composite fertilizer.
2, method according to claim 1 is characterized in that: described mixed fertilizer slip transferpump is to be suitable for containing impeller pump or the volumetric pump that solid materials is carried.
3, method according to claim 1 is characterized in that: described phosphorus ammonium is a monoammonium phosphate, and described sylvite is Repone K or vitriolate of tartar, and described weighting agent is a granularity less than 0.5 millimeter ground dolomite or Paris white.
4, method according to claim 1 is characterized in that: described prilling tower is cylindrical reinforced concrete or steel structure tower, and draft type is natural ventilation or forced ventilation, and the virtual height of tower is 30～90 meters, and the internal diameter of tower is 10～24 meters.
5, method according to claim 4 is characterized in that: described forced ventilation mode is in prilling tower top installation shaft flow fan exhausting.
6, method according to claim 1 is characterized in that: described prilling granulator is meant rotary differential shower nozzle.
7, method according to claim 1, it is characterized in that: when preparation mixed fertilizer slip, add moderate-element compound or trace compound, be mixed together with urea melt and phosphorus ammonium and sylvite, make the mixed fertilizer slip that contains moderate-element compound or trace compound.
8, method according to claim 7 is characterized in that: described moderate-element compound is one or more the mixture in calcium cpd, magnesium compound or the sulphur compound; Described trace compound is one or more the mixture in boron compound, copper compound, iron cpd, manganic compound, molybdenum compound or the zn cpds.
9, according to claim 7 or 8 described methods, it is characterized in that: described moderate-element compound is one or more the mixture in calcium sulfate, nitrocalcite, sal epsom, potassium magnesium sulfate or the sulphur; Described trace compound is one or more the mixture in copper sulfate, cupric oxide, ammonium molybdate, Sodium orthomolybdate, boric acid, borax, ferrous sulfate, chelated iron, zinc sulfate, zinc oxide, zinc chloride, manganous sulfate, manganese oxide or the Manganous chloride tetrahydrate.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610025186 CN1948232A (en) | 2006-03-29 | 2006-03-29 | Method of tower type pelletizing manufacturing composite mixed fertilizer |
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|---|---|---|---|
| CN 200610025186 CN1948232A (en) | 2006-03-29 | 2006-03-29 | Method of tower type pelletizing manufacturing composite mixed fertilizer |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100586906C (en) * | 2007-09-20 | 2010-02-03 | 兖矿鲁南化肥厂 | Production process for high tower roller composite fertilizer |
| CN103011981A (en) * | 2012-12-31 | 2013-04-03 | 深圳市芭田生态工程股份有限公司 | Phosphorus-potassium granular compound fertilizer and preparation method thereof |
| CN106116990A (en) * | 2016-06-25 | 2016-11-16 | 深圳市芭田生态工程股份有限公司 | The nitro-compound fertilizer that a kind of air prilling produces |
| CN108218592A (en) * | 2018-04-11 | 2018-06-29 | 华中农业大学 | One kind is suitable for novel phospho-ammonium fertilizer of yellowish soil and preparation method thereof |
-
2006
- 2006-03-29 CN CN 200610025186 patent/CN1948232A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100586906C (en) * | 2007-09-20 | 2010-02-03 | 兖矿鲁南化肥厂 | Production process for high tower roller composite fertilizer |
| CN103011981A (en) * | 2012-12-31 | 2013-04-03 | 深圳市芭田生态工程股份有限公司 | Phosphorus-potassium granular compound fertilizer and preparation method thereof |
| CN103011981B (en) * | 2012-12-31 | 2015-08-19 | 深圳市芭田生态工程股份有限公司 | Phosphorus potassium grain compound fertilizer and preparation method thereof |
| CN106116990A (en) * | 2016-06-25 | 2016-11-16 | 深圳市芭田生态工程股份有限公司 | The nitro-compound fertilizer that a kind of air prilling produces |
| CN108218592A (en) * | 2018-04-11 | 2018-06-29 | 华中农业大学 | One kind is suitable for novel phospho-ammonium fertilizer of yellowish soil and preparation method thereof |
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