CN102126901B - Granulator and preparation method for coated 15N urea - Google Patents
Granulator and preparation method for coated 15N urea Download PDFInfo
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- CN102126901B CN102126901B CN2011100262513A CN201110026251A CN102126901B CN 102126901 B CN102126901 B CN 102126901B CN 2011100262513 A CN2011100262513 A CN 2011100262513A CN 201110026251 A CN201110026251 A CN 201110026251A CN 102126901 B CN102126901 B CN 102126901B
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Abstract
The invention relates to a preparation method and granulator for coated 15N urea. The granulator consists of a smelting cavity, a heating element, a temperature control system, a condensing mechanism and the like. The preparation method comprises the following steps of: adding powdery 15N urea into the smelting cavity for smelting; dripping the smelted 15N urea into the condensing mechanism through micropores for condensing into particles; putting the particles into a granulating disc; adjusting the rotating speed and raising the temperature; dispersing a coated mixture into the disc; and maintaining the rotating speed at 30-40 revolutions per minute and the temperature of a material in the disc between 70oC and 75oC until resin on the surface of the particles is fully cured and is uniformly adhered to the surfaces of the particles. By adopting the invention, the long-time technical problem of difficulty in producing and preparing the coated 15 N urea is solved, and good material guarantee is provided for quantitative research and evaluation of the trend of controlled-release urea in a farmland ecological system. The granulator used in the method has the advantages of simple structural design, easiness of manufacturing, low manufacturing cost, easiness and convenience of operation and use and easiness of maintenance.
Description
Technical field
The present invention relates to slow Controlled Release Nitrogen Fertilizer technical field, be specifically related to a kind of coating 15N process for prepn. of urea and prilling granulator.
Background technology
Over nearly 10 years, flourish take coated carbamide as main slow Controlled Release Nitrogen Fertilizer technology.At present the superior and inferior evaluating of various coated ureas all is based on the apparent Output response of agronomy angle and the theoretical releasing research in laboratory etc., and to coated urea a little less than the bodily destination in the farmland and chemical behavior research relative thin.The 15N tracing method is all adopted in the whereabouts research of nitrogen.General chemistry nitrogenous fertilizer all can directly adopt the 15N mark nitrogen of Chemical Manufacture to be used for test.But the 15N tracing method is applied to the quantitative assessment research of Controlled Release Nitrogen Fertilizer whereabouts rarely has report.Its difficulty mainly is in the preparation of 15N mark Controlled Release Nitrogen Fertilizer, that is to say granulation again and the coating of 15N mark chemical nitrogen fertilizer.Because urea has very large water solubility and hygroscopicity, it can not adopt the habitual granulating technique of phosphate fertilizer, the granulating of namely reuniting under the condition of humidity; Can not adopt the granulating technique identical with potash fertilizer, because can not obtain satisfactory compactness.
Few and the expensive raw material price of coating 15N amount of urea, coating 15N urea is not suitable for adopting the common process method of large-scale granulation (as high-tower granulation, fluidized bed prilling etc.), encapsulation tool and flow process complexity of the complexity of waste to manufacture, and lacks at present the manufacturing equipment of coating 15N urea granules and the preparation method of corresponding simple possible.
Summary of the invention
The technical problem to be solved in the present invention is to provide that a kind of technological process is simple, the material loss amount is few, is suitable for the method that small lot prepares coating 15N urea, and discloses a kind of Granulation Equipments of simple in structure, easy operating.
For solving the problems of the technologies described above, the technical solution used in the present invention is:
A kind of 15N urea granulating device, comprise melting cavity, heater element, temperature control system, condensing mechanism and support, described melting cavity is mounted on described support, its underpart is for being inverted taper, and vertex of a cone place is provided with the droplet hole, this melting cavity upper port is provided with seal cover, and sealing covers feed hopper is installed; Described temperature control system comprises thermometer and time relay controller, and the temperature-sensitive head of described thermometer passes described seal cover and is installed in the melting cavity; Described heater element is arranged on described melting chamber outer wall surrounding; Described condensing mechanism is installed on below, described droplet hole, and it comprises liquid refrigerants and container thereof, and this vessel port is over against being connected to described droplet hole.
Described heater element is heat tape.
Described melting cavity is made by stainless steel material.
The diameter in described droplet hole is 2～3mm.
The exit in described droplet hole to the distance of liquid refrigerants liquid level is 4～5cm.
A kind of preparation method of coating 15N urea mainly comprises the following steps:
(1) granulation first rises to 120～125 with temperature heating in the melting cavity of above-mentioned 15N urea granulating device
oC(control melt temperature is the key of granulation, surpasses critical-temperature and easily produces biuret, and the too low melting of temperature is not saturating), more pulverous 15N urea is added via feed hopper carry out melting in the melting cavity; Liquid 15N urea after melting oozes through micropore, and enters in refrigerant in condensing mechanism, and liquid 15N urea becomes rapidly the single-size body of 2～4mm;
(2) on coating, step gained 15N urea granules after screening and removing impurities, is put into granulating disc, regulates disc rotation speed to 30～40 rev/min, and simultaneously to the disk heat temperature raising, in dish, 15N urea granules temperature rises 70
oDuring C, reduce disc rotation speed to 10 rev/min, the even cloth of required coating resin compound is spilt on particle to the disk, then improve disc rotation speed to 30～40 rev/min and keep dish endoparticle thing temperature 70
oC～75
oC solidifies fully to the particle surface resin, till evenly being attached to 15N urea granules surface; Repeating this step as the need multi-coated gets final product.
For reaching better coating effect, can common control release ureas mixing other granular size of 15N urea granules and equivalent is consistent, that color is different carry out coating.Choosing common control release urea after completing gets final product.
The urea coated device of above-mentioned 15N contains rack-mounted rotating disk and drive motors thereof, and rotating disk and horizontal direction are 30～60 ° of angles installs, and is provided with at the downside of rotating disk the semicircular arc electric furnace that is complementary with this rotating disk shape.
Shaft is installed or stirs the bar tooth in the bottom of above-mentioned rotating disk surrounding.
The present invention has actively useful effect:
1. process of the present invention is simple, and preparation cost is low, has solved the technical barrier that coating 15N urea is difficult to manufacture for a long time, and the whereabouts for control release urea in farmland ecosystem is carried out the quantitative study evaluation provides good material guarantee;
2. prilling granulator structural design used is simple, be easy to make, and cheap for manufacturing cost; Operation, easy to use is easy to safeguard;
3. the coating 15N urea granules reliable in quality prepared of this inventive method, balling ratio is high, does not lump, and particle is large, and granule strength is high, also can effectively reduce or avoid producing biuret; Can be directly used in experiment after product after coating is completed sorts again, comprise the whereabouts of utilization rate, residual rate, total losses etc. in order to study coated with resin 15N urea, carry out the agronomy of common coated carbamide of equal technique and environmental effect evaluation etc.
Description of drawings
Fig. 1 is a kind of structural representation of 15N urea granulating device;
Fig. 2 is the cross-sectional view of melting cavity in Fig. 1;
Fig. 3 is melting cavity bottom cross-section structure enlarged diagram;
Fig. 4 is the side structure schematic diagram of the urea coated device of 15N;
Fig. 5 is the Facad structure schematic diagram of the urea coated device of 5N;
Fig. 6 is the Facad structure schematic diagram of the urea coated device of another kind of 15N.
In figure, 1 is thermometer, and 2 is seal cover, and 3 is loading hopper, 4 are the melting cavity, and 5 is heat tape, and 6 is condensing mechanism, 7 is support, and 8 is the time relay controller, and 9 is the droplet hole, 10 is temperature sensing probe of thermometer, and 11 is rotating disk, and 12 is the semicircular arc electric furnace, 13 is buncher, and 14 is speed regulator, and 15 is base, 16 is frame, and 17 for stirring the bar tooth.
The specific embodiment
1 one kinds of 15N urea granulating devices of embodiment, referring to Fig. 1, Fig. 2, Fig. 3, comprise melting cavity 4, heat tape 5, temperature control system, condensing mechanism and support, melting cavity 4 is made of the stainless pipe of long 15cm, diameter 5cm and the bottom welding cone body with diameter 0.2cm droplet hole, is wound with the heat tape 5 of 220 volts 150 watts as heater element at melting cavity 4 outer walls; Melting cavity 4 is mounted on support 7, and these melting cavity 4 upper port are provided with the seal cover 2 made from polytetrafluoroethylene (PTFE), on sealing lid 2, loading hopper 3 is installed; Temperature control system comprises high temperature thermometer 1, time relay controller 8 and voltage-stabilizing controller (not shown in FIG.), the temperature-sensitive head 10 of thermometer 10 passes seal cover 2 and is installed on (temperature-sensitive head 10 stays the gap of 0.2cm when inserting with melting cavity 4 inner groovies) in melting cavity 4, condensing mechanism 6 is installed on 9 belows, described droplet hole, it comprises liquid refrigerants (vegetable oil) and container (long 20cm thereof, diameter 5cm), this vessel port is over against being connected to droplet hole 9, and the exit in droplet hole 9 to the distance of liquid refrigerants liquid level is 4～5cm.
A kind of preparation method of coating 15N urea mainly comprises the following steps:
(1) the control voltage-stablizer switch of above-mentioned prilling granulator is first opened in granulation, and voltage is transferred to 180 volts, and heat tape 5 energisings add the temperature demonstration situation that melting cavity 4 heats up and observes thermometer 1, when temperature reaches 100
oPowered-down during C, the opening time relay makes electric heating warming be in the alternating state of closure-unlatching, and purpose is to prevent from heating up too fast, and observed temperature is 125
oDuring C, appropriate 15N urea is put into melting cavity 4 meltings of prilling granulator; And in cavity, the temperature-sensitive head 10 due to glass-stem thermometer 1 leaves the gap of 0.2cm when inserting with melting cavity 4 inner bottom parts, just makes liquid 15N urea after melting 9 ooze cavity through the circular droplet of cone body hole; The liquid 15N urea that oozes splashes into a long 20cm again, and diameter 5cm is equipped with vegetable oil as in cooling container.To low temperature, liquid 15N urea becomes rapidly the single-size body of 2～4mm left and right due to high temperature.Practice result shows, when the vegetable oil liquid level was 4～5cm apart from cone body micropore top distance, the granulation effect was best, uniform particles.
So constantly feed in raw material and carry out the granulation again of 15N urea.What pay special attention to is will observe at any time that a thermometer indicates temperature to change, and surpasses temperature and can adjust temperature by suitably adding material.
(2) on coating, step gained 15N urea granules after screening and removing impurities, is put into granulating disc,
The above-mentioned 15N urea of having made grain is put into rotating disk.Open speed regulating motor switch, regulating rotary speed is 30～40 rev/mins, opens simultaneously circular arc electric furnace (1000 watts) rotating disk is heated, and the temperature general control is 70
oThe C left and right.After temperature required meeting the demands, reducing rotating speed is 10 rev/mins, and required coating resin compound is evenly dripped on particle, then ceaselessly stirs particle with scoop, suitably heightens rotating speed, makes between particle mutually not bond.Temperature and rotating speed are maintained respectively 70～75
oC and 30～40 rev/mins, endless stir-fries, and solidifies fully to the particle surface resin, till evenly being attached to 15N urea granules surface; Should carry out the multilayer coating in practical operation, complete aforesaid operations at every turn and be one deck.The concrete formula of required coating resin is consistent with the ordinary resin coated carbamide formula that will estimate.After evenly being shared, the required resin total amount that calculates carries out the operation of gradation coating.
After one batch of 15N carbamide granulation, the oil stain on eliminating particle surface is picked separation.Rejecting the ropy particle of granulation reclaims again.The vegetable oil cooling agent can be recycled.
The urea coated device of above-mentioned steps (2) 15N used, referring to Fig. 4, Fig. 5, comprise the rotating disk 11(350mm that is arranged on frame 16, dark 200mm) and drive buncher 13, buncher 13 is with speed regulator 14, frame 16 is arranged on base 15, and rotating disk 11 is 45 ° of angles with horizontal direction to be installed, and is provided with at the downside of rotating disk 11 the semicircular arc electric furnace 12 that is complementary with this rotating disk 11 shapes.
The coating 15N urea size 2～5mm for preparing as stated above, Biuret Content＜0.5wt%, bulk density＞780 ㎏/m
3, crushing strength 〉=3.0 ㎏ power.
Claims (6)
1. 15N urea granulating device, comprise melting cavity, heater element, temperature control system, condensing mechanism and support, it is characterized in that, described melting cavity is mounted on described support, its underpart is for being inverted taper, and vertex of a cone place is provided with the droplet hole, and this melting cavity upper port is provided with seal cover, and sealing covers feed hopper is installed; Described temperature control system comprises thermometer and relay controller, and the temperature-sensitive head of described thermometer passes described seal cover and is installed in the melting cavity; Described heater element is arranged on described melting chamber outer wall surrounding; Described condensing mechanism is installed on below, described droplet hole, it comprises liquid refrigerants and container thereof, this vessel port is over against being connected to described droplet hole, and the diameter in described droplet hole is 2～3mm, and the exit in described droplet hole to the distance of liquid refrigerants liquid level is 4～5cm.
2. 15N urea granulating device according to claim 1, is characterized in that, described heater element is heat tape.
3. 15N urea granulating device according to claim 1, is characterized in that, described melting cavity is made by stainless steel material.
4. the preparation method of a coating 15N urea, is characterized in that, comprises the following steps:
(1) granulation first rises to 120～125 with temperature heating in the melting cavity of the described 15N urea granulating device of claim 1
oC, more pulverous 15N urea is added via feed hopper carry out melting in the melting cavity; Liquid 15N urea after melting oozes through micropore, and enters in refrigerant in condensing mechanism, and liquid 15N urea becomes rapidly the single-size body of 2～4mm;
(2) on coating, step gained 15N urea granules after screening and removing impurities, is put into the urea coated device of 15N, and adjusting rotary disk rotating speed to 30～40 rev/mins is simultaneously to the rotary disk heat temperature raising, when dish endoparticle temperature rises to 70
oDuring C, reduce rotary disk rotating speed to 10 rev/min, the even cloth of required coating resin compound is spilt on particle to the rotary disk, then improve rotary disk rotating speed to 30～40 rev/min and keep dish endoparticle temperature 70
oC～75
oC solidifies fully to the particle surface resin, till evenly being attached to 15N urea granules surface; Repeating this step as the need multi-coated gets final product.
5. the preparation method of coating 15N urea according to claim 4, it is characterized in that, the urea coated device of described 15N contains rack-mounted rotating disk and drive motors thereof, rotating disk and horizontal direction are 30～60 ° of angles installs, and is provided with at the downside of rotating disk the semicircular arc electric furnace that is complementary with this rotating disk shape.
6. the preparation method of coating 15N urea according to claim 5, is characterized in that, shaft is installed or stirs the bar tooth in the bottom of described rotating disk surrounding.
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| CN2011100262513A CN102126901B (en) | 2011-01-25 | 2011-01-25 | Granulator and preparation method for coated 15N urea |
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| CN2011100262513A CN102126901B (en) | 2011-01-25 | 2011-01-25 | Granulator and preparation method for coated 15N urea |
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| CN102126901A CN102126901A (en) | 2011-07-20 |
| CN102126901B true CN102126901B (en) | 2013-06-05 |
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| JP2002306943A (en) * | 2001-04-12 | 2002-10-22 | Mitsubishi Chemicals Corp | Countercurrent granulator |
| CN1672781A (en) * | 2005-01-25 | 2005-09-28 | 周端午 | Integrated melt material pelletizing and filming production method and apparatus |
| WO2008121017A1 (en) * | 2007-02-22 | 2008-10-09 | Federalnoe Gosudarstvennoe Unitarnoe Predpriyatie 'nauchno-Issledovatelky I Tekhnologichesky Institut Opticheskogo Materialovedeniya Vserossiyskogo Nauchnogo Tsentra 'gosudarstvenny Optichesky Institu | Melt granulating method and a granulator |
| CN201340203Y (en) * | 2008-12-19 | 2009-11-04 | 宁波金远东工业科技有限公司 | Fluidized cooling device for urea prilling tower |
| CN201493082U (en) * | 2008-04-15 | 2010-06-02 | 齐秀琴 | Flow centralized-control multihole dropping device |
| CN201971753U (en) * | 2011-01-25 | 2011-09-14 | 中国科学院南京土壤研究所 | 15N urea granulating device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5677252A (en) * | 1979-11-27 | 1981-06-25 | Chisso Corp | Granulation of urea |
| JP5063843B2 (en) * | 2001-07-23 | 2012-10-31 | 東ソー株式会社 | Method for dripping granulation of slurry melt and method for producing urea-based composite fertilizer granule using the same |
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- 2011-01-25 CN CN2011100262513A patent/CN102126901B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002306943A (en) * | 2001-04-12 | 2002-10-22 | Mitsubishi Chemicals Corp | Countercurrent granulator |
| CN1672781A (en) * | 2005-01-25 | 2005-09-28 | 周端午 | Integrated melt material pelletizing and filming production method and apparatus |
| WO2008121017A1 (en) * | 2007-02-22 | 2008-10-09 | Federalnoe Gosudarstvennoe Unitarnoe Predpriyatie 'nauchno-Issledovatelky I Tekhnologichesky Institut Opticheskogo Materialovedeniya Vserossiyskogo Nauchnogo Tsentra 'gosudarstvenny Optichesky Institu | Melt granulating method and a granulator |
| CN201493082U (en) * | 2008-04-15 | 2010-06-02 | 齐秀琴 | Flow centralized-control multihole dropping device |
| CN201340203Y (en) * | 2008-12-19 | 2009-11-04 | 宁波金远东工业科技有限公司 | Fluidized cooling device for urea prilling tower |
| CN201971753U (en) * | 2011-01-25 | 2011-09-14 | 中国科学院南京土壤研究所 | 15N urea granulating device |
Non-Patent Citations (3)
| Title |
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| JP昭56-77252A 1981.06.25 |
| JP特开2002-306943A 2002.10.22 |
| JP特开2003-33640A 2003.02.04 |
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