CN102126901A - Granulator and preparation method for coated 15N urea - Google Patents
Granulator and preparation method for coated 15N urea Download PDFInfo
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- CN102126901A CN102126901A CN2011100262513A CN201110026251A CN102126901A CN 102126901 A CN102126901 A CN 102126901A CN 2011100262513 A CN2011100262513 A CN 2011100262513A CN 201110026251 A CN201110026251 A CN 201110026251A CN 102126901 A CN102126901 A CN 102126901A
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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 nitrogenous fertilizer technical field, be specifically related to a kind of coating 15N urea production method and prilling granulator.
Background technology
Over nearly 10 years, flourish based on the slow controlled release nitrogenous fertilizer technology of coated carbamide.Superior and inferior evaluating to various coating nitrogenous fertilizer all is based on the apparent output response of agronomy angle and the theoretical releasing research in the testing laboratory etc. at present, and to a little less than the bodily destination and chemical conduct research relative thin of coating nitrogenous fertilizer in the farmland.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 evaluation research of controlled release nitrogenous fertilizer whereabouts rarely has report.Its difficulty mainly is to that is to say the granulation again and the coating of 15N mark chemical nitrogen fertilizer in the preparation of 15N mark controlled release nitrogenous fertilizer.Because urea has very big water solubility and water absorbability, it can not adopt the habitual agglomeration technique of phosphate fertilizer, the granulating of promptly reuniting under the condition of humidity; Can not adopt the agglomeration technique identical, because can not obtain satisfactory compactness with potash fertilizer.
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 prilling, fluidized bed prilling etc.), encapsulation tool and flow process complexity of the complexity of waste to manufacture, and lacks the manufacturing equipment of coating 15N urea granules and the preparation method of corresponding simple possible at present.
Summary of the invention
The technical problem to be solved in the present invention provides that a kind of technical process is simple, the material loss amount is few, is suitable for the method that short run prepares coating 15N urea, and discloses a kind of granulating equipment of simple in structure, easy handling.
For solving the problems of the technologies described above, the technical solution used in the present invention is:
A kind of 15N carbamide granulation device, comprise fusion cavity, Heating element, temperature control system, condensing mechanism and support, described fusion cavity is mounted on the described support, its underpart is for being inverted taper, and vertex of a cone place is provided with the droplet hole, this fusion cavity upper port is provided with sealing cover, and sealing covers hopper is installed; Described temperature control system comprises thermometer and time relay controller, and the temperature-sensitive head of described thermometer passes described sealing cover and is installed in the fusion cavity; Described Heating element is installed in around the described fusion chamber outer wall; 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 Heating element is a heat tape.
Described fusion cavity is made by stainless 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 coating 15N preparation method of urea mainly may further comprise the steps:
(1) granulation rises to 120～125 with temperature heating in the fusion cavity of above-mentioned 15N carbamide granulation device earlier
oC(control melt temperature is the key of granulation, surpasses critical temperature and easily produces biuret, and temperature crosses that low then fusion is not saturating), pulverous 15N urea is added in the fusion cavity via hopper carry out fusion again; Liquid 15N urea after the fusion oozes through micropore, and enters in the refrigerant in the condensing mechanism, and liquid 15N urea becomes the single-size body of 2～4mm rapidly;
(2) step gained 15N urea granules is put into granulating disc on the coating after screening and removing impurities, regulates disc rotation speed to 30～40 rev/min, and simultaneously to the disk heat temperature raising, 15N urea granules temperature rises 70 in the dish
oDuring C, reduce disc rotation speed to 10 rev/min, the even cloth of required coating resin compound is spilt on the particulate matter to the disk, improve disc rotation speed to 30～40 rev/min again and keep dish endoparticle thing temperature 70
oC～75
oC is to particle surface resin completely solidified, evenly attached to till the 15N urea granules surface; As need repeatedly coating repeat this step and get final product.
For reaching better coating effect, other granular size unanimity of 15N urea granules and equivalent, common control release urea that color is different can be mixed and carry out coating.Choosing common control release urea after finishing gets final product.
The urea coated device of above-mentioned 15N contains rack-mounted rotating disk and drive-motor thereof, and rotating disk and horizontal direction are 30～60 ° of angles installs, and is provided with the semicircular arc electric furnace that is complementary with this rotating disk shape at the downside of rotating disk.
Stir shaft is installed around the bottom of above-mentioned rotating disk or stirs the bar tooth.
The present invention has actively useful effect:
1. processing method of the present invention is simple, and preparation cost is low, has solved coating 15N urea and has been difficult to produce the technical barrier of preparation for a long time, and carrying out the quantitative examination evaluation for the whereabouts of control release urea in farmland ecosystem provides good material guarantee;
2. used prilling granulator structure design is simple, is 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, the balling ratio height does not lump, and particle is big, and the granule strength height also can effectively reduce or avoids producing biuret; Can be directly used in experiment after product after coating is finished sorts again, comprise the whereabouts of utilization ratio, residual rate, total losses etc., carry out the agronomy of common coated carbamide of equal technology and environmental effect evaluation etc. in order to research coated with resin 15N urea.
Description of drawings
Fig. 1 is a kind of structural representation of 15N carbamide granulation device;
Fig. 2 is the cross-sectional view of fusion cavity among Fig. 1;
Fig. 3 is a fusion cavity bottom cross-section structure enlarged diagram;
Fig. 4 is the side structure synoptic diagram of the urea coated device of 15N;
Fig. 5 is the Facad structure synoptic diagram of the urea coated device of 5N;
Fig. 6 is the Facad structure synoptic diagram of the urea coated device of another kind of 15N.
1 is thermometer among the figure, and 2 is sealing cover, and 3 is loading hopper, 4 are the fusion 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 the thermometer temperature sensing head, 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.
Embodiment
1 one kinds of 15N carbamide granulations of embodiment device, referring to Fig. 1, Fig. 2, Fig. 3, comprise fusion cavity 4, heat tape 5, temperature control system, condensing mechanism and support, fusion cavity 4 is made of the cone body in the stainless pipe of long 15cm, diameter 5cm and bottom welding band diameter 0.2cm droplet hole, is wound with 220 volts 150 watts heat tape 5 as Heating element at fusion cavity 4 outer walls; Fusion cavity 4 is mounted on the support 7, and these fusion cavity 4 upper port are provided with the sealing cover made from tetrafluoroethylene 2, on the sealing lid 2 loading hopper 3 is installed; Temperature control system comprises pyrometer 1, time relay controller 8 and voltage-stabilizing controller (not drawing among the figure), the temperature-sensitive head 10 of thermometer 10 passes sealing cover 2 and is installed on (temperature-sensitive head 10 and fusion cavity 4 inner groovies stay the gap of 0.2cm when inserting) in the fusion cavity 4, condensing mechanism 6 is installed on 9 belows, described droplet hole, it comprises liquid refrigerants (vegetables 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 coating 15N preparation method of urea mainly may further comprise the steps:
(1) the control potentiostat switch of above-mentioned prilling granulator is opened in granulation earlier, and voltage is transferred to 180 volts, and heat tape 5 energisings add the temperature demonstration situation that fusion cavity 4 heats up and observes thermometer 1, when temperature reaches 100
oPowered-down during C is opened the time relay, makes electric heating warming be in the alternating state of closure-unlatching, and purpose is to prevent to heat up too fast, and observed temperature is 125
oDuring C, an amount of 15N urea is put into fusion cavity 4 fusions of prilling granulator; And in the cavity because the temperature-sensitive head 10 of glass-stem thermometer 1 and fusion cavity 4 inner bottom parts leave the gap of 0.2cm when inserting, just make the liquid 15N urea after the fusion ooze cavity through the circular droplet of cone body hole 9; The liquid 15N urea that oozes splashes into a long 20cm again, and diameter 5cm is equipped with vegetables oil as in the refrigerative container.Because high temperature is to low temperature, liquid 15N urea becomes the single-size body about 2～4mm rapidly.Practice result shows that when the vegetables 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 then can adjust temperature by suitably adding material.
(2) step gained 15N urea granules is put into granulating disc on the coating after screening and removing impurities,
The above-mentioned 15N urea of having made grain is put into rotating disk.Open the buncher switch, regulating rotary speed is 30～40 rev/mins, opens circular arc electric furnace (1000 watts) simultaneously rotating disk is heated, and temperature generally is controlled at 70
oAbout C.After temperature required meeting the demands, reducing rotating speed is 10 rev/mins, and required coating resin compound is evenly dripped on the particulate matter, stirs particulate matter with what scoop did not stop then, suitably heightens rotating speed, makes between particulate matter bonding mutually.Temperature and rotating speed are maintained 70～75 respectively
oC and 30～40 rev/mins, endless stir-fries, to particle surface resin completely solidified, evenly attached to till the 15N urea granules surface; In actually operating, should carry out the multilayer coating, finish aforesaid operations at every turn and be one deck.The concrete prescription of required coating resin is consistent with the ordinary resin coated carbamide prescription that will estimate.After evenly sharing, good required resin total amount carries out the operation of gradation coating with calculating.
Behind 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 vegetables oil refrigerant can be recycled.
The urea coated device of the used 15N of above-mentioned steps (2), referring to Fig. 4, Fig. 5, comprise the rotating disk 11(350mm that is installed on the frame 16, dark 200mm) and drive buncher 13, buncher 13 has speed regulator 14, frame 16 is installed on the base 15, and rotating disk 11 is 45 ° of angles with horizontal direction to be installed, and is provided with the semicircular arc electric furnace 12 that is complementary with this rotating disk 11 shapes at the downside of rotating disk 11.
The coating 15N urea size 2～5mm for preparing as stated above, Biuret Content＜0.5wt%, tap density＞780 ㎏/m
3, crushing strength 〉=3.0 ㎏ power.
Embodiment 2 is substantially the same manner as Example 1, and difference is: be symmetrically installed with three around the bottom of the rotating disk 11 of the urea coated device of used 15N and stir bar tooth 17, referring to Fig. 6.
Claims (8)
1. 15N carbamide granulation device, comprise fusion cavity, Heating element, temperature control system, condensing mechanism and support, it is characterized in that, described fusion cavity is mounted on the described support, its underpart is for being inverted taper, and vertex of a cone place is provided with the droplet hole, and this fusion cavity upper port is provided with sealing cover, and sealing covers hopper is installed; Described temperature control system comprises thermometer and relay controller, and the temperature-sensitive head of described thermometer passes described sealing cover and is installed in the fusion cavity; Described Heating element is installed in around the described fusion chamber outer wall; 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.
2. 15N carbamide granulation device according to claim 1 is characterized in that described Heating element is a heat tape.
3. 15N carbamide granulation device according to claim 1 is characterized in that described fusion cavity is made by stainless material.
4. 15N carbamide granulation device according to claim 1 is characterized in that the diameter in described droplet hole is 2～3mm.
5. 15N carbamide granulation device according to claim 1 is characterized in that, the exit in described droplet hole to the distance of liquid refrigerants liquid level is 4～5cm.
6. a coating 15N preparation method of urea is characterized in that, may further comprise the steps:
(1) granulation rises to 120～125 with temperature heating in the fusion cavity of the described 15N carbamide granulation of claim 1 device earlier
oC adds pulverous 15N urea in the fusion cavity via hopper and carries out fusion; Liquid 15N urea after the fusion oozes through micropore, and enters in the refrigerant in the condensing mechanism, and liquid 15N urea becomes the single-size body of 2～4mm rapidly;
(2) step gained 15N urea granules is put into the urea coated device of 15N on the coating after screening and removing impurities, 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 the particulate matter to the rotary disk, improve rotary disk rotating speed to 30～40 rev/min again and keep dish endoparticle temperature 70
oC～75
oC is to particle surface resin completely solidified, evenly attached to till the 15N urea granules surface; As need repeatedly coating repeat this step and get final product.
7. coating 15N preparation method of urea according to claim 6, it is characterized in that, the urea coated device of described 15N contains rack-mounted rotating disk and drive-motor thereof, rotating disk and horizontal direction are 30～60 ° of angles installs, and is provided with the semicircular arc electric furnace that is complementary with this rotating disk shape at the downside of rotating disk.
8. coating 15N preparation method of urea according to claim 7 is characterized in that, stir shaft is installed around the bottom of described rotating disk or stirs the bar tooth.
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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 true CN102126901A (en) | 2011-07-20 |
| CN102126901B CN102126901B (en) | 2013-06-05 |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5677252A (en) * | 1979-11-27 | 1981-06-25 | Chisso Corp | Granulation of urea |
| JP2002306943A (en) * | 2001-04-12 | 2002-10-22 | Mitsubishi Chemicals Corp | Countercurrent granulator |
| JP2003033640A (en) * | 2001-07-23 | 2003-02-04 | Tosoh Corp | Dropping granulation method of slurry melt and producing method of urea compound fertilizer granulated material using the same |
| 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 |
-
2011
- 2011-01-25 CN CN2011100262513A patent/CN102126901B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5677252A (en) * | 1979-11-27 | 1981-06-25 | Chisso Corp | Granulation of urea |
| JP2002306943A (en) * | 2001-04-12 | 2002-10-22 | Mitsubishi Chemicals Corp | Countercurrent granulator |
| JP2003033640A (en) * | 2001-07-23 | 2003-02-04 | Tosoh Corp | Dropping granulation method of slurry melt and producing method of urea compound fertilizer granulated material using the same |
| 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 |
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| CN102126901B (en) | 2013-06-05 |
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