CN103011982B - Industrial production method and device of urea-formaldehyde slow-release compound fertilizer - Google Patents
Industrial production method and device of urea-formaldehyde slow-release compound fertilizer Download PDFInfo
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- CN103011982B CN103011982B CN201210593644.7A CN201210593644A CN103011982B CN 103011982 B CN103011982 B CN 103011982B CN 201210593644 A CN201210593644 A CN 201210593644A CN 103011982 B CN103011982 B CN 103011982B
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Abstract
The invention relates to an industrial production method and device of a urea-formaldehyde slow-release compound fertilizer and a device thereof. The industrial production method comprises the steps of adding water and oxidized starch to a reaction still and then pasting, adding urea of which the nitrogen content is 46wt% and formalin, stirring, dissolving and then adjusting the pH value to 8.5-8.8 by an alkaline matter, reacting at constant temperature of 60 DEG C to obtain reaction liquid; adjusting the pH value to 5.4-5.1 by the reaction liquid; reacting for 45 minutes at the constant temperature of 65-68 DEG C, then adjusting the pH value to 6.8-7.2, and terminating reaction to obtain the urea formaldehyde condensation product solution; mixing the urea formaldehyde condensation product solution with nitrogen, phosphorus and potassium materials, pelletizing, drying and cooling to below 35 DEG C, and screening to obtain the urea-formaldehyde slow-release compound fertilizer. The industrial production device of the urea-formaldehyde slow-release compound fertilizer is also provided by the invention. Urea formaldehyde is taken as a skeleton; rapid disintegration phenomenon of fertilizer particles caused by water absorption expansion is effectively prevented; the urea-formaldehyde slow-release compound fertilizer has good nutrient slow-release performance, and is high in pelletizing rate in the production process and strong in granule hardness, and the total nutrient content is improved.
Description
Technical field
The present invention relates to a kind of industrialized preparing process and device of urea aldehyde slow-release compound fertilizer, belong to the technical field of fertiliser production.
Background technology
China is chemical fertilizers production maximum in the world and country of consumption, year consumption accounts for world Fertilizer total quantity consumed about 35%, according to statistics, between 1996 ~ 2008 years, China's fertilizer application amount increases 36.9%, and total output of grain only increases 4.7%, ever-increasing chemical fertilizer drops into and does not continue to increase grain yield.Occur that the reason of this phenomenon is many-sided, utilization rate of fertilizer reduces and causes yield increasing effect to decline a beyond doubt important reason.Current developed country chemical fertilizer this season utilization ratio average out to 50-60%, and China's chemical fertilizer this season utilization ratio is on average only 30-35%.The loss waste of macronutrient not only brings huge financial loss to society, but also can cause serious environmental pollution.Improve utilization rate of fertilizer, reduce rate of fertilizer application, save labor of fertilizer application power, seem particularly important, Slow/Controlled Release Fertilizers makes it to absorb with crop nutrition content basic synchronised by the regulation and control to nutrient release rate, greatly can improve fertilizer nutrient utilization, reduces widespread pollution from the overuse of fertilizers and pesticides in rural area, meet the requirement of National Sustainable Development Strategies, therefore sustained-controll-release fertiliser has become one of Main way of 21 century fertilizer industry development.
At present, the research of domestic and international organic polymer coating controlled-release fertilizer has developed into a higher height, Technology reaches its maturity, nutrient controlled release properties is good, the problem that production cost is high obtains preliminary solution, but apart from its on field crop generally application wait to reduce production cost further; Sulfur coated fertilizer price is lower, but this technique can reduce the nutrient content of macroelement greatly, makes fertilizer total nutrient on the low side; Urease inhibitor and nitrification inhibitor equistability fertilizer can not meet the requirement of slow controlled release properties, and exist blending uneven, use inconvenient problem, therefore develop and a kind ofly to use conveniently, be applicable to the sustained-controll-release fertiliser that field crop promotes and have important practical significance.
Chinese patent literature CN1198425A(98109068.0) disclose a kind of synthetic method of urea aldehyde release and release control fertilizer, in production composite fertilizer process, add urea aldehyde fertilizer mix with other chemical fertilizer, granulation is carried out by tablets press, produce a kind of slowly-releasing urea-formaldehyde compound fertilizer, object is that the nitrogen in fertilizer is manured into soil, and energy slow releasing, to meet the needs of plant growth, reduce nitrogen loss, improve utilization rate of fertilizer; Urea aldehyde fertilizer be by urea and formaldehyde in acid condition condensation form, the power of urea aldehyde fertilizer slow-release performance is the length being decided by condenses molecular chain, it depends on formaldehyde, and many conditions of interaction of urea are as the molecular ratio of urea and formaldehyde, pH value, temperature and reaction times.Chinese patent literature CN101391905A(200810225221.3) disclose urea-formaldehyde fertilizer and urea-formaldehyde complex fertilizer and preparation method thereof, comprise the steps: 1) starch is mixed with water, gelatinization obtains starch paste, the mass ratio of described starch and described water is starch: water=1: 5-20, is preferably 1: 5-10; 2) in described starch paste, urea and formaldehyde is added; PH value be 10.5-13, temperature reacts 30-120 minute under being the condition of 65-80 DEG C, obtains solution I; The mol ratio of described urea and described formaldehyde is 2-4: 1, is preferably 2.45: 1; The mass ratio of described urea and described starch is 30-60: 1, is preferably 45: 1; Described pH value is preferably 10.5-11, and described temperature is preferably 65-70 DEG C, and the time of described reaction is preferably 60-120 minute; 3) in described solution I, add sorbent material and sulphuric acid soln, mixing obtains urea-formaldehyde fertilizer slurry, and solidification obtains urea-formaldehyde fertilizer.But above-mentioned Chinese patent literature has set forth the chemical synthesis process of urea-formaldehyde fertilizer, the physics blending etc. with common fertilizer mostly, lack urea-formaldehyde fertilizer and be combined with the system of common fertilizer in production technique device and optimize.
Summary of the invention
For the deficiencies in the prior art, the invention provides a kind of industrialized preparing process and device of urea aldehyde slow-release compound fertilizer.Utilize present method and device to produce urea aldehyde slow-release compound fertilizer, technical process is simple, easy to operate, is applicable to serialization scale operation, to reduce production cost, to improve output.
The industrialized preparing process of urea aldehyde slow-release compound fertilizer of the present invention, technical scheme is as follows:
An industrialized preparing process for urea aldehyde slow-release compound fertilizer, this production method step is as follows:
(1) 60 DEG C ~ 90 DEG C gelatinizations 15 ~ 30 minutes are warming up to after adding water and Sumstar 190 in a kettle., add urea that nitrogen content is 46wt% and concentration is the formalin of 30 ~ 40wt%, with alkaline matter adjust pH to 8.5 ~ 8.8 after stirring and dissolving, 60 DEG C of isothermal reactions obtain reaction solution in 60 ~ 70 minutes; Described water: the mass ratio of urea is 1:(1.2 ~ 1.5), described formalin: the mass ratio of urea is 1: (0.85 ~ 1.15), described Sumstar 190: the mass ratio of urea is 1:(10 ~ 12);
(2) be 5.4 ~ 5.1,65 ~ 68 DEG C of isothermal reactions 45 minutes by the reaction solution acidic substance adjust pH in step (1), then use alkaline matter adjust ph to 6.8 ~ 7.2, termination reaction, obtain urea-formaldehyde condensation product solution;
(3) by urea-formaldehyde condensation product solution obtained for step (2) and N P and K raw material mixing granulation, dry 30 ~ 45 minutes for 150 ~ 200 DEG C, be cooled to less than 35 DEG C, final sizing goes out the urea aldehyde slow-release compound fertilizer of 2.0mm ~ 4.5mm; Described N P and K raw material is urea, ammonium sulfate, monoammonium phosphate, Repone K or volatile salt, and described urea-formaldehyde condensation product solution and the mass ratio of N P and K raw material are 1:(4.5 ~ 8).Wherein, need to carry out proportioning to N P and K raw material according to Different Nutrients in complex fertilizer product.
According to the present invention, preferably, the alkaline matter in described step (1) and (2) is the potassium hydroxide aqueous solution of solid borax or 20wt%; Acidic substance in described step poly-(2) are 20wt% dilute sulphuric acid, 20wt% phosphoric acid or 20wt% boric acid.
According to the present invention, preferably, in described step (3), mixing granulation carries out in rotary drum granulator.
According to the present invention, preferably, in described step (3), bake out temperature is 160 ~ 180 DEG C, and described Sieving and casing is 2.75 ~ 3.75mm.
According to the present invention, preferably, the nitrogen content of urea is 46wt% in described step (3), and the nitrogen content of ammonium sulfate is 20wt%, and the nitrogen content of monoammonium phosphate is 11wt%, with P
2o
5the nutrient content of meter is 44wt%, with K in Repone K
2the nutrient content of O meter is 60wt%, and the nitrogen content of volatile salt is 17wt%.
According to the present invention, preferably, the step adding anti hardening agent in urea aldehyde slow-release compound fertilizer is also comprised after sieving out urea aldehyde slow-release compound fertilizer in described step (3), with anti hardening agent product conventional in slow controlled-release compound fertilizer technical field, preferred anti hardening agent add-on is add 3 ~ 8g in every kilogram of urea aldehyde slow-release compound fertilizer.
The present invention also provides a kind of industrial production device of urea aldehyde slow-release compound fertilizer, and technical scheme is as follows:
An industrial production device for urea aldehyde slow-release compound fertilizer, this production equipment comprises solid substances feeding unit, pasty material feeding unit, mixing granulation device, drying unit, refrigerating unit and screening plant; The discharging of solid substances feeding unit is conveyed into the opening for feed of mixing granulation device; Pasty material feeding unit comprises stirred autoclave, formaldehyde feeding unit, pH regulator device, urea feeding unit and volume pump, the discharging of formaldehyde feeding unit and the discharging of pH regulator device are conveyed into the opening for feed of stirred autoclave respectively, the discharge port of urea feeding unit and the opening for feed of stirred autoclave are oppositely arranged, and stirred autoclave is connected with mixing granulation device by volume pump; The discharge port of mixing granulation device and the opening for feed of drying unit are oppositely arranged, and drying unit comprises gas blower, hotblast stove and dryer, and gas blower connects hotblast stove, and hotblast stove is communicated with dryer; The discharge port of dryer and the opening for feed of refrigerating unit are oppositely arranged, and the discharge port of refrigerating unit and the opening for feed of screening plant are oppositely arranged.
According to the present invention, preferably, described solid substances feeding unit comprises raw material mixing machine, raw material conveyor, raw material crushing machine and raw material bucket elevator, the discharge port of raw material mixing machine and the feeding end of raw material conveyor are oppositely arranged, the discharge end of raw material conveyor and the feeding mouth of raw material crushing machine are oppositely arranged, the discharge port of raw material crushing machine and the feeding mouth of raw material bucket elevator are oppositely arranged, and the discharge port of raw material bucket elevator and the feeding mouth of mixing granulation device are oppositely arranged.
According to the present invention, preferably, described formaldehyde feeding unit comprises formaldehyde storage tank, formaldehyde pump and formaldehyde scale tank, and formaldehyde storage tank is connected with formaldehyde scale tank by formaldehyde pump, and the discharge port of formaldehyde scale tank and the opening for feed of stirred autoclave are oppositely arranged.
According to the present invention, preferably, the industrial production device of urea aldehyde slow-release compound fertilizer also comprises screening conveyor, face powder cylinder, finished product bucket elevator, finished product bin, packing scale; The discharge port of screening plant is oppositely arranged with the feeding end of screening conveyor, the discharge end of screening conveyor is oppositely arranged with the feeding mouth of face powder cylinder, the face powder discharge port of cylinder and the feeding mouth of finished product bucket elevator are oppositely arranged, the discharge port of finished product bucket elevator and the feeding mouth of finished product bin are oppositely arranged, and discharge port and the packing scale of finished product bin are oppositely arranged.
When the industrial production device of urea aldehyde slow-release compound fertilizer of the present invention uses, add water and Sumstar 190 stirring gelatinization in stirred autoclave after, to stirred autoclave, formalin is added from formaldehyde feeding unit, to stirred autoclave, urea is added from urea feeding unit, and by the pH value in pH regulator device timely adjustment stirred autoclave, urea-formaldehyde condensation product is obtained after having reacted, then by volume pump, the urea-formaldehyde condensation product in stirred autoclave is pumped in mixing granulation device, simultaneously solid substances feeding unit N P and K raw material is joined in mixing granulation device with urea-formaldehyde condensation product mixing granulation, be sent to after granulation completes in drying unit and dry, be sent to after having dried in refrigerating unit and carry out being cooled to less than 35 DEG C, be then sent in screening plant and sieve.Be sent to after having sieved in face powder cylinder and add anti hardening agent, be then sent in finished product bin by finished product bucket elevator, after weighing with packing scale, pack and obtain urea aldehyde slow-release compound fertilizer product.
Compared with the prior art, outstanding effect of the present invention is:
(1) use oxidization starch modified, obtained slow release fertilizer free formaldehyde content low.
(2) use borax, potassium hydroxide, phosphoric acid and calcium oxide etc. to regulate pH value in reaction, the demand of crop to middle and trace element can be met.
(3) urea aldehyde slow-release compound fertilizer take urea formaldehyde as skeleton, effectively can prevent the quickly disintegrated phenomenon of fertiliser granulates water-swelling, there is good nutrient particularly nitrogen sustained release performance, improve its total nutrient content, and balling ratio is high in production process, pellet hardness is comparatively large (>=18N) also.
(4) establish urea aldehyde slow-release compound fertilizer preparation process, achieve industrialization continuous seepage.
(5) improve utilization rate of fertilizer, reduce widespread pollution from the overuse of fertilizers and pesticides in rural area, strengthen the resistance of plant, improve crop quality.
Accompanying drawing explanation
Fig. 1 is the structural representation of the industrial production device of the embodiment of the present invention 1 urea aldehyde slow-release compound fertilizer; Wherein, 1 raw material mixing machine, 2 raw material conveyors, 3 raw material crushing machines, 4 raw material bucket elevators, 5 tablets presss, 6 formaldehyde storage tanks, 7 formaldehyde pumps, 8 urea bucket elevators, 9 formaldehyde scale tanks, 10 sour scale tanks, 11 stirred autoclaves, 12 volume pumps, 13 dryer belt machines, 14 gas blowers, 15 hotblast stoves, 16 dryers, 17 cooling conveyors, 18 coolers, 19 screening bucket elevators, 20 sieve apparatus, 21 screening conveyors, 22 face powder cylinder, 23 finished product bucket elevators, 24 finished product bins, 25 packing scales.
Embodiment
Below by specific embodiment, the present invention will be further described, but be not limited thereto.
In embodiment, raw materials used and equipment is conventional commercial products if no special instructions.
Wherein, Sumstar 190: Kingsoft, Tai'an modified starch company limited is on sale.Anti hardening agent: Zhengzhou Sen Hong abrasive substance company limited is on sale.
Embodiment 1: a kind of industrial production device of urea aldehyde slow-release compound fertilizer, this production equipment comprises raw material mixing machine 1, raw material conveyor 2, raw material crushing machine 3, raw material bucket elevator 4, tablets press 5, formaldehyde storage tank 6, formaldehyde pump 7, urea bucket elevator 8, formaldehyde scale tank 9, acid scale tank 10, stirred autoclave 11, volume pump 12, dryer belt machine 13, gas blower 14, hotblast stove 15, dryer 16, cooling conveyor 17, cooler 18, screening bucket elevator 19, sieve apparatus 20, screening conveyor 21, face powder cylinder 22, finished product bucket elevator 23, finished product bin 24, packing scale 25, the discharge port of raw material mixing machine 1 and the feeding end of raw material conveyor 2 are oppositely arranged, the discharge end of raw material conveyor 2 and the feeding mouth of crusher 3 are oppositely arranged, the discharge port of raw material crushing machine 3 and the feeding mouth of raw material bucket elevator 4 are oppositely arranged, and the discharge port of raw material bucket elevator 4 and the feeding mouth of tablets press 5 are oppositely arranged, formaldehyde storage tank 6 is connected with formaldehyde scale tank 9 by formaldehyde pump 7, the discharge port of the discharge port of formaldehyde scale tank 9, the discharge port of urea bucket elevator 8 and sour scale tank 10 aims at the feeding mouth of stirred autoclave 11 respectively, and stirred autoclave 11 is connected with tablets press 5 by volume pump 12, the discharge port of tablets press 5 and the feeding end of dryer belt machine 13 are oppositely arranged, and the discharge end of dryer belt machine 13 and the feeding mouth of dryer 16 are oppositely arranged, and gas blower 14 connects hotblast stove 15, and hotblast stove 15 is communicated with dryer 16, the discharge port of dryer 16 is oppositely arranged with the feeding end of cooling conveyor 17, the cooling discharge end of conveyor 17 and the feeding mouth of cooler 18 are oppositely arranged, the discharge port of cooler 18 is oppositely arranged with the feeding mouth of screening bucket elevator 19, the screening discharge port of bucket elevator 19 and the feeding mouth of sieve apparatus 20 are oppositely arranged, the discharge port of sieve apparatus 20 is oppositely arranged with the feeding end of screening conveyor 21, the discharge end of screening conveyor 21 is oppositely arranged with the feeding mouth of face powder cylinder 22, the face powder discharge port of cylinder 22 and the feeding mouth of finished product bucket elevator 23 are oppositely arranged, the discharge port of finished product bucket elevator 23 and the feeding mouth of finished product bin 24 are oppositely arranged, discharge port and the packing scale 25 of finished product bin 24 are oppositely arranged.
Utilize the method for said apparatus suitability for industrialized production urea aldehyde slow-release compound fertilizer, step is as follows:
(1) agitator of stirred autoclave 11 is opened, 90 DEG C of gelatinizations 20 minutes are warming up to add water and Sumstar 190 in stirred autoclave 11 after, in stirred autoclave 11, the urea that nitrogen content is 46wt% is added by urea bucket elevator 8, the formalin being 37wt% by the concentration in formaldehyde storage tank 6 by formaldehyde pump 7 is pumped in formaldehyde scale tank 9, the formaldehyde measured joins in stirred autoclave 11 by formaldehyde scale tank 9, after urea stirring and dissolving, in stirred autoclave 11, add borax adjust ph to 8.5 ~ 8.8,60 DEG C of isothermal reactions obtain reaction solution in 70 minutes; Described water: the mass ratio of urea is 1:1.25, described formalin: the mass ratio of urea is 1: 1.04, described Sumstar 190: the mass ratio of urea is 1:10;
(2) be 5.4 ~ 5.1,65 DEG C isothermal reactions 45 minute by sour scale tank 10 with the dilute sulphuric acid adjust pH that concentration is 20wt% by the reaction solution in step (1), then use 20wt%KOH solution adjust ph to 7.0, termination reaction, obtain urea-formaldehyde condensation product solution;
(3) urea-formaldehyde condensation product solution obtained for step (2) is pumped in tablets press 5 by volume pump 12 with the speed of 1.5t/h, is 11wt% by 55wt%(nitrogen content, with P
2o
5meter nutrient content be 44wt%) monoammonium phosphate with the speed of 4.1t/h, 60wt%(with K
2o count) Repone K with the urea of the speed of 2.3t/h, 46wt% nitrogen content with the speed of 2.9t/h, calcium powder (CaCO
3content is 98.5wt%) enter into after raw material crushing machine 3 fragmentation through raw material conveyor 2 again after raw material mixing machine 1 mixes with the speed of 1.2t/h, enter into tablets press 5 and the urea-formaldehyde condensation product solution mixing granulation from volume pump 12; Then dryer 16 is entered into by dryer belt machine 13, gas blower 14 blasts hot blast by hotblast stove 15 and directly contacts oven dry with the material after mixing granulation in dryer 16, bake out temperature controls: dry head 170 ~ 180 DEG C, dry tail 60 ~ 70 DEG C, material stops about 30 minutes in dryer; Dry after terminating and by cooling conveyor 17, the material after oven dry is sent in cooler 18 and is cooled to less than 35 DEG C with natural wind, be sent in sieve apparatus 20 by screening bucket elevator 19 again and sieve, control Sieving and casing is 2.75mm ~ 3.75mm, be sent in face powder cylinder 22 by screening conveyor 21 after having sieved and add anti hardening agent, add-on is add 5g anti hardening agent in every kilogram of urea aldehyde slow-release compound fertilizer, then be sent in finished product bin 24 by finished product bucket elevator 23, after weighing with packing scale 25, pack and obtain urea aldehyde slow-release compound fertilizer product.
Urea aldehyde slow-release compound fertilizer prepared by the present embodiment has quick-acting and long-acting feature, the needs in crop whole vegetative period can be met, there will not be the later stage to take off fertile phenomenon, the amount of controlled release phase length and Controlled Release Fertilizer can realize by adjusting urea and the mol ratio of formaldehyde and the additional proportion of urea-formaldehyde condensation product solution.
Urea aldehyde slow-release compound fertilizer pellet hardness scope prepared by the present embodiment: 18 ~ 25N.
Urea aldehyde slow-release compound fertilizer prepared by the present embodiment take urea formaldehyde as skeleton, effectively can prevent the quickly disintegrated phenomenon of fertiliser granulates water-swelling.
Urea aldehyde slow-release compound fertilizer prepared by the present embodiment fails to detect free formaldehyde after testing.
The nutrient composition of the urea aldehyde slow-release compound fertilizer that table 1 is prepared for the present embodiment.
Table 1:
| Project | Index (weight content) |
| Total nutrient (N+P 2O 5+K 2O) content % | 46.2 |
| Nitrogen (N) content % | 18.2 |
| Phosphorus (P 2O 5) content % | 16.0 |
| Potassium (K 2O) % | 12.2 |
| Slow-release nitrogen amount of nutrients (in cold water Nonsoluble nitrogen CWIN) % | 2.41 |
| Hot water Nonsoluble nitrogen (HWIN) % | 1.27 |
| Reactivity coefficient (AI) % | 47.3 |
| Water (H 2O) content % | 0.67 |
As known from Table 1, in urea aldehyde slow-release compound fertilizer prepared by the present embodiment, the content of cold water Nonsoluble nitrogen is 2.41wt%, meets urea aldehyde slow-release fertilizer HG/T4137-2010 industry standard.
Embodiment 2: a kind of industrialized preparing process of urea aldehyde slow-release compound fertilizer, step, with embodiment 1, is 8.5 ~ 8.8 unlike step (1) with the potassium hydroxide aqueous solution adjust pH of 20wt%.
Embodiment 3: a kind of industrialized preparing process of urea aldehyde slow-release compound fertilizer, step, with embodiment 1, is 5.4 ~ 5.1 unlike step (2) with the phosphoric acid adjust pH that massfraction is 20%.
Embodiment 4: a kind of industrialized preparing process of urea aldehyde slow-release compound fertilizer, step is with embodiment 1, water unlike described in step (1): the mass ratio of urea is 1:1.2, described formalin: the mass ratio of urea is 1: 1.0, described Sumstar 190: the mass ratio of urea is 1:10.
Embodiment 5: a kind of industrialized preparing process of urea aldehyde slow-release compound fertilizer, step is with embodiment 3, water unlike described in step (1): the mass ratio of urea is 1:1.5, the concentration of described formalin is 40wt%, described formalin: the mass ratio of urea is 1: 1.13, described Sumstar 190: the mass ratio of urea is 1:12.
Claims (8)
1. an industrialized preparing process for urea aldehyde slow-release compound fertilizer, is characterized in that, this production method step is as follows:
(1) 60 DEG C ~ 90 DEG C gelatinizations 15 ~ 30 minutes are warming up to after adding water and Sumstar 190 in a kettle., add urea that nitrogen content is 46wt% and concentration is the formalin of 30 ~ 40wt%, with alkaline matter adjust pH to 8.5 ~ 8.8 after stirring and dissolving, 60 DEG C of isothermal reactions obtain reaction solution in 60 ~ 70 minutes; Described water: the mass ratio of urea is 1:(1.2 ~ 1.5), described formalin: the mass ratio of urea is 1: (0.85 ~ 1.15), described Sumstar 190: the mass ratio of urea is 1:(10 ~ 12);
(2) be 5.4 ~ 5.1,65 ~ 68 DEG C of isothermal reactions 45 minutes by the reaction solution acidic substance adjust pH in step (1), then use alkaline matter adjust ph to 6.8 ~ 7.2, termination reaction, obtain urea-formaldehyde condensation product solution;
(3) by urea-formaldehyde condensation product solution obtained for step (2) and N P and K raw material mixing granulation, dry 30 ~ 45 minutes for 160 ~ 180 DEG C, be cooled to less than 35 DEG C, final sizing goes out the urea aldehyde slow-release compound fertilizer of 2.75mm ~ 3.75mm; Described N P and K raw material is urea, ammonium sulfate, monoammonium phosphate, Repone K or volatile salt, and described urea-formaldehyde condensation product solution and the mass ratio of N P and K raw material are 1:(4.5 ~ 8);
Alkaline matter in described step (1) and (2) is the potassium hydroxide aqueous solution of solid borax or 20wt%; Acidic substance in described step poly-(2) are 20wt% dilute sulphuric acid, 20wt% phosphoric acid or 20wt% boric acid.
2. the industrialized preparing process of urea aldehyde slow-release compound fertilizer according to claim 1, is characterized in that, in described step (3), mixing granulation carries out in rotary drum granulator.
3. the industrialized preparing process of urea aldehyde slow-release compound fertilizer according to claim 1, is characterized in that, the nitrogen content of urea is 46wt% in described step (3), and the nitrogen content of ammonium sulfate is 20wt%, and the nitrogen content of monoammonium phosphate is 11wt%, with P
2o
5the nutrient content of meter is 44wt%, with K in Repone K
2the nutrient content of O meter is 60wt%, and the nitrogen content of volatile salt is 17wt%.
4. the industrialized preparing process of urea aldehyde slow-release compound fertilizer according to claim 1, it is characterized in that, also comprise the step adding anti hardening agent in urea aldehyde slow-release compound fertilizer after sieving out urea aldehyde slow-release compound fertilizer in described step (3), described anti hardening agent add-on is add 3 ~ 8g in every kilogram of urea aldehyde slow-release compound fertilizer.
5. the industrial production device of the urea aldehyde slow-release compound fertilizer described in a claim 1 ~ 4, this production equipment comprises solid substances feeding unit, pasty material feeding unit, mixing granulation device, drying unit, refrigerating unit and screening plant, it is characterized in that, the discharging of solid substances feeding unit is conveyed into the opening for feed of mixing granulation device; Pasty material feeding unit comprises stirred autoclave, formaldehyde feeding unit, pH regulator device, urea feeding unit and volume pump, the discharging of formaldehyde feeding unit and the discharging of pH regulator device are conveyed into the opening for feed of stirred autoclave respectively, the discharge port of urea feeding unit and the opening for feed of stirred autoclave are oppositely arranged, and stirred autoclave is connected with mixing granulation device by volume pump; The discharge port of mixing granulation device and the opening for feed of drying unit are oppositely arranged, and drying unit comprises gas blower, hotblast stove and dryer, and gas blower connects hotblast stove, and hotblast stove is communicated with dryer; The discharge port of dryer and the opening for feed of refrigerating unit are oppositely arranged, and the discharge port of refrigerating unit and the opening for feed of screening plant are oppositely arranged.
6. the industrial production device of urea aldehyde slow-release compound fertilizer according to claim 5, it is characterized in that, described solid substances feeding unit comprises raw material mixing machine, raw material conveyor, raw material crushing machine and raw material bucket elevator, the discharge port of raw material mixing machine and the feeding end of raw material conveyor are oppositely arranged, the discharge end of raw material conveyor and the feeding mouth of raw material crushing machine are oppositely arranged, the discharge port of raw material crushing machine and the feeding mouth of raw material bucket elevator are oppositely arranged, and the discharge port of raw material bucket elevator and the feeding mouth of mixing granulation device are oppositely arranged.
7. the industrial production device of urea aldehyde slow-release compound fertilizer according to claim 5, it is characterized in that, described formaldehyde feeding unit comprises formaldehyde storage tank, formaldehyde pump and formaldehyde scale tank, formaldehyde storage tank is connected with formaldehyde scale tank by formaldehyde pump, and the discharge port of formaldehyde scale tank and the opening for feed of stirred autoclave are oppositely arranged.
8. the industrial production device of urea aldehyde slow-release compound fertilizer according to claim 5, is characterized in that, the industrial production device of this urea aldehyde slow-release compound fertilizer also comprises screening conveyor, face powder cylinder, finished product bucket elevator, finished product bin, packing scale; The discharge port of screening plant is oppositely arranged with the feeding end of screening conveyor, the discharge end of screening conveyor is oppositely arranged with the feeding mouth of face powder cylinder, the face powder discharge port of cylinder and the feeding mouth of finished product bucket elevator are oppositely arranged, the discharge port of finished product bucket elevator and the feeding mouth of finished product bin are oppositely arranged, and discharge port and the packing scale of finished product bin are oppositely arranged.
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