CN102910991A - Large-granule sustained-release ammonium chloride fertilizer, preparation method thereof and special granulating sustained-release material - Google Patents
Large-granule sustained-release ammonium chloride fertilizer, preparation method thereof and special granulating sustained-release material Download PDFInfo
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Abstract
The invention discloses a large-granule sustained-release ammonium chloride fertilizer, a preparation method thereof and a special granulating sustained-release material. The special granulating sustained-release material comprises urea, aldehyde, modifiers, acidoid, alkaline matters and water, the mole ratio of the urea to the aldehyde is 1-5:1, the mass of the modifiers accounts for 0-30% of that of the urea, the acidoid and the alkaline matters are used for regulating the system pH (potential of hydrogen) value, and the mass of the water is 2-5 times of that of the urea. The large-granule sustained-release ammonium chloride fertilizer is prepared by using commercial ammonium chloride powder as a basal fertilizer and agglomerating, bonding and granulating the granulating sustained-release material. The special granulating sustained-release material has excellent fluidity and stability, has no corrosion to equipment, and is high in granulation balling rate, mellow and smooth in granule and high in granule strength. Besides, the large-granule sustained-release ammonium chloride fertilizer is simple in production process, can be achieved by a normal disc or a drum, low in cost, high in yield and convenient for popularization and application.
Description
Technical field
The present invention relates to a kind of macrobead slowly-releasing ammonium chloride fertilizer and preparation method thereof and special-purpose granulation slow-release material.
Background technology
Ammonium chloride is as the byproduct of soda industry, and its output is about 1.07 times of soda ash output.According to investigations, present domestic Production of Ammonium Chloride production capacity is about 2,000 ten thousand ton/years, and its actual annual production is also near ten million ton.The ammonium chloride of high yield like this, except being widely used in medicine and industry, major applications is in agricultural.As a kind of instant nitrogenousfertilizer, the nitrogen content of agricultural ammonium chloride fertilizer is more than 25%.A large amount of research and practices show, this chloro instant nitrogenousfertilizer is applicable to neutrality and alkaline soil, it is to paddy rice, and especially the effect of increasing production of early rice is fairly obvious, and most of farm crop such as other crop such as wheat, corn, cotton, rape are also had obvious volume increase and high-quality effect.
But commercial agricultural ammonium chloride fertilizer is generally Powdered or little grains, easily invests when using to cause on the leaves of farm crop and the stem to burn the seedling phenomenon; Its moisture absorption and cause caking very easily again simultaneously, and be difficult for broken, thereby bring great inconvenience for transportation, storage and use.Therefore, Powdered ammonium chloride being carried out granulation can address the above problem; In addition, the dissolution rate of granular ammonium chloride is slower, and the leaching that can reduce nitrogen runs off.
At present, the prilling process of granular ammonium chloride fertilizer mainly contains three kinds of crystallization granulation, mechanical compaction granulation and agglomeration granulation.Wherein, crystallization granulation refers to add medium crystallization agent in ammonium chloride solution, such as metal ion (JPO 7276(56)), organic salt (JPO 33-4565) or urea (CN 101249970A) etc., impel its crystallization and grow up.But the ammonia chloride crystal grain diameter that obtains is difficult to surpass 2 mm, and the medium crystallization agent that adds also can affect its purposes.The mechanical compaction granulation is ammonium chloride under high pressure to be pressed into particulate state or little strip is broken into granular (CN 1183396A) again.Its particle profile is not round and smooth, energy consumption is large, cost is high and output is limited.Agglomeration granulation refers to that Powdered base fertilizer reunites, adheres to into particulate state (CN 102503636A) under the effect of binding agent, therefore also is bonded pelleting.It is the prilling process of present modal granulated fertilizer, and common disk or rotary drum can be realized.This prilling process technique is simple, throughput is large, but highly acid binding agent is had relatively high expectations to the anticorrosive of equipment.
Meanwhile, countries in the world are all greatly developed and can be delayed or control the slowly/controlled releasing fertilizer that nutrient discharges, and to improve the utilization ratio of fertilizer, reduce the loss of nutrient and to the pollution of environment.At present mainly be that granulated fertilizer is carried out coating to reduce or to control the rate of release of nutrient, its technique is to coat various slow/controlled release materials on the granulated fertilizer surface of finished product.Although the slowly/controlled releasing fertilizer that makes like this has good slow/controlled release performance, its Cost Problems, the environmental problem in making and using etc. have limited its range of application greatly.And the production of this slowly/controlled releasing fertilizer belongs to the secondary processing of finished product fertilizer, and its production line and production cycle all are extended, and needs in addition extra adding equipment and manpower.Therefore, how to reduce production costs and production cycle, reducing becomes development slowly/controlled releasing fertilizer urgent problem to the harm of environment.
Make a general survey of domestic and international various slowly/controlled releasing fertilizer, adopt inorganic, organic composite material conduct sticking (glue) knot material, prepare the slow release fertilizer of various sticking (glue) junction types, such as organic/inorganic sticking (glue) knot slow release fertilizer (Shavia A, Mikkelsen R L. Fertil Res, 1993, (35): 1-12; Tzika M, Alexandridou S, et al. Powder Technology, 2003,132 (1): 16-24; The cementing coated slow release fertilizer of Zhang Fudao research institute of China research of agricultural science institute development, referring to CN 02126009.5, CN 200310116857.1, CN 200410088477.6, CN 200410091315.8, CN 200810222050.9 etc.), bar-shaped bonding slow release fertilizer (US 2032608, US 3892552, US 4348218, US 6120574, CA 2602344, CN 10155182, CN2264741, CN 200958084Y etc.).The former sticking (glue) knot material greatly mainly with water as dispersion medium, though substantially solved safety and pollution problem in the Production of manure process, but still with a large amount of petroleum organism as mixing (gathering) component, residual contamination problem after using in soil is not solved, and this sticking (glue) knot material is outer coatings (film) the slow-release material use as a kind of granulated fertilizer mostly; Though the latter is as a kind of slowly-releasing matrix material of endoplasm type, bar-shaped etc. irregularly shaped but the slow release fertilizer of its preparation mostly is.
The invention reside in provides a kind of aq. type bonded pelleting slow-release material, directly uses it for the granulation of agricultural ammonium chloride base fertilizer, makes simultaneously it contain a certain amount of slowly-releasing available nitrogen nutrient, need not to prolong production line, and technique is simple, saving is invested, reduce cost.
Summary of the invention
The object of the present invention is to provide a kind of macrobead slowly-releasing ammonium chloride fertilizer and preparation method thereof and special-purpose granulation slow-release material.
The granulation slow-release material of macrobead slowly-releasing ammonium chloride fertilizer provided by the present invention comprises urea, aldehyde, properties-correcting agent, acidic substance, alkaline matter and water; Wherein, the mol ratio of described urea and aldehyde is 1-5:1; The quality of described properties-correcting agent is for being the 0-30 % of urea quality; Described acidic substance and alkaline matter are used for the pH value of regulation system; The quality of described water is urea quality 2-5 times.
Described granulation slow-release material is to contain the urea aldehyde of the nutrient slowly-released effect of certain nitrogen or the aqueous solution of modified urea-formaldehyde, and its solid content is 15-40 %.
Described aldehyde is a kind of or its arbitrary combination in the following aldehyde: formaldehyde, Paraformaldehyde 96, acetaldehyde, propionic aldehyde, butyraldehyde-n, isobutyric aldehyde, phenyl aldehyde, furfural, crotonic aldehyde, myristic aldehyde, aubepine, oxalic dialdehyde, mda, suceinic aldehyde, glutaraldehyde, hexanedial;
Described properties-correcting agent is a kind of or its arbitrary combination in the following substances: starch, Sumstar 190, Mierocrystalline cellulose, methylcellulose gum, Natvosol, hydroxyethylmethyl-cellulose, Vltra tears, carboxymethyl cellulose, hydroxypropylcellulose, xylogen, nitration of lignin, chitosan, soybean protein, glucose, fructose, lactose, sucrose, maltose, molasses, Weibull, trimeric cyanamide, polyvinyl alcohol, gum arabic, gelatin;
Described acidic substance are a kind of or its arbitrary combination in the following substances: hydrochloric acid, sulfuric acid, phosphoric acid, nitric acid, formic acid, tosic acid;
Described alkaline matter is a kind of or its arbitrary combination in the following substances: sodium hydroxide, potassium hydroxide, calcium oxide, ammoniacal liquor, thanomin, diethanolamine, trolamine.
Granulation slow-release material provided by the present invention is prepared by the following method:
(1) in reactor, adds the urea that measures, add urea quality 2-5 water doubly, stirring makes the urea dissolving, regulate pH value 7.5-10 with alkaline matter, mol ratio by urea and aldehyde is the amount adding aldehyde of 1-5:1, stirs 0.5-2 h at 70-90 ℃, then adds the properties-correcting agent that quality is urea quality 0-30%, control pH value 7.5-10 continues to stir 0.5-1 h;
(2) regulate pH value 4.5-6.5 with acidic substance, continue to stir 0.5-1.5 h at 70-90 ℃, then regulate pH value 7.5-10 with alkaline matter, cooling, discharging namely get described granulation slow-release material.
Macrobead slowly-releasing ammonium chloride fertilizer provided by the present invention take commercial ammonium chloride powder as base fertilizer, utilizes the above-mentioned granulation slow-release material bonded pelleting of reuniting to make.
Described granulation slowly-releasing material usage is the 2-30 % of ammonium chloride base fertilizer quality.
Macrobead slowly-releasing ammonium chloride fertilizer provided by the present invention is prepared by the following method:
(1) the ammonium chloride powder below particle diameter 0.3 mm is added in granulating disc or the rotary drum granulator, be preheated to 50-90 ℃;
(2) spray the above-mentioned granulation slow-release material of the 1-30 % that accounts for ammonium chloride base fertilizer quality on the material in the described granulating disc of step (1) or the rotary drum granulator;
(3) screening obtains particle diameter at the macrobead slowly-releasing ammonium chloride fertilizer finished product of 2-4.75 mm after the particulate slow-release ammonium chloride fertilizer work in-process drying after the granulation, the cooling, sieves the after crushed again granulation of underproof part.
Compare with the granular ammonium chloride fertilizer of additive method preparation, the present invention adopts the aqueous solution of urea aldehyde or modified urea-formaldehyde as the granulation slow-release material of macrobead slowly-releasing ammonium chloride fertilizer, has following clear superiority:
(1) further reaction can occur with aldehyde in the active group in the properties-correcting agent, thereby is used for reducing the content of aldehyde in the obtained granulation slow-release material, makes its safer environmental protection, and it can also improve its adhesive property simultaneously, improves its water resistance.
(2) granulation slow-release material of the present invention is neutral or weakly alkaline urea aldehyde or the modified urea-formaldehyde aqueous solution, has good flowability and stable, the convenient storage and conveying; Simultaneously on equipment without impacts such as corrosion.
(3) granulation process that utilizes granulation slow-release material of the present invention to prepare macrobead ammonium chloride fertilizer also is the process that acid ammonium chloride impels the further reaction of urea aldehyde or modified urea-formaldehyde to solidify; so the macrobead ammonium chloride fertilizer of producing is higher than the balling ratio of other prilling process; particle is more mellow and fuller, smooth, and granule strength is larger.
(4) granulation slow-release material of the present invention is the binding agent of granulation in the macrobead slowly-releasing ammonium chloride fertilizer that makes, and also is the source of slowly-releasing available nutrient urea attitude nitrogen.Therefore, not only improved total nutrient content and the utilization ratio thereof of fertilizer, and noresidue in soil after using.
(5) preparation of macrobead slowly-releasing ammonium chloride fertilizer of the present invention can directly utilize traditional granulation of compound fertilizer production unit, need not newly-builtly, and production technique is simple, and cost is low, output is large, and is easy to utilize.
(6) granulation slow-release material of the present invention is except can be used for preparing the macrobead slowly-releasing ammonium chloride fertilizer; also can be used for preparing macrobead slowly-releasing ammonium sulfate fertilizer; or contain the macrobead slow-release compound fertilizer of ammonium chloride, ammonium sulfate, comprise the composite fertilizer of containing trace element, and fertilizer etc.
Embodiment
The present invention is further elaborated below in conjunction with specific examples, but the present invention is not limited in following instance.Described method is ordinary method if no special instructions, and described material all can obtain if no special instructions from commercial channels.
Following embodiment all measures the slowly-releasing available nutrient content of gained granulation slow-release material and the granule strength of gained macrobead slowly-releasing ammonium chloride fertilizer as follows.
Wherein, the massfraction to the effective slowly-releasing nutrient of plant urea attitude nitrogen carries out according to the regulation in the urea aldehyde slow release fertilizer rower (HG/T 4137-2010) in the gained granulation slow-release material;
The measuring method of the granule strength of gained macrobead slowly-releasing ammonium chloride fertilizer is: get a certain amount of macrobead slowly-releasing ammonium chloride fertilizer finished product and screen with standard composite fertilizer sub-sieve; evenly choose 30 of the fertiliser granulates of particle diameter between 2.0-4.75 mm; measure one by one its crushed pressure, then average.
Embodiment 1
(1) granulation slowly-releasing material preparation:
1) adding 120.0g urea in reactor, add 240.0 g water, stir and make its dissolving, is that 30 % sodium hydroxide are regulated pH value 9.5 with mass concentration, and the mass concentration that adds 108.0 g of metering is 37 % formaldehyde solutions, stirs 2.0 h at 85 ℃;
2) being that 30 % sulphuric acid solns are regulated pH value 6.0 with mass concentration, continuing to stir 1.0 h at 85 ℃, is that 30 % sodium hydroxide solutions are regulated pH value 8.5 with mass concentration then, and cooling, discharging make described granulation slow-release material.
Solid content 30.6 % of prepared granulation slow-release material, slowly-releasing available nitrogen massfraction is 13.6 %.
(2) preparation of macrobead slowly-releasing ammonium chloride fertilizer:
1) takes by weighing the following 2.0 kg ammonium chloride powder of particle diameter 0.3 mm and add in the granulating disc, pass into 85 ℃ of hot blasts;
2) spray above-mentioned granulation slow-release material with the two-fluid spray gun in described rotary drum granulator, consumption is 10 % of ammonium chloride powder;
3) screening after the granular ammonium chloride work in-process drying after the granulation, the cooling is obtained particle diameter at the macrobead ammonium chloride finished product of 2-4.75 mm, sieve the after crushed again granulation of underproof part.
The granule strength of prepared macrobead slowly-releasing ammonium chloride fertilizer is 41 N.
Embodiment 2
(1) granulation slowly-releasing material preparation:
1) in reactor, adds 90.0 g urea, add 450.0 g water, stirring makes its dissolving, be that 30 % sodium hydroxide solutions are regulated pH value 9.5 with mass concentration, adding 81.0 g mass concentrations is 37 % formaldehyde solutions, stirs 2.0 h at 80 ℃, then adds 27.0 g glucose, and regulate pH value 9.5, continue to stir 1.0 h;
2) be that 30 % formic acid solutions are regulated pH value 5.5 with mass concentration, continue to stir 1.0 h at 80 ℃, then regulate pH value 8.5 with trolamine, cooling, discharging make described granulation slow-release material.
Solid content 19.5 % of prepared granulation slow-release material, slowly-releasing available nitrogen massfraction is 11.8 %.
(2) preparation of macrobead slowly-releasing ammonium chloride fertilizer:
1) takes by weighing 2.0 following kg ammonium chloride powder of particle diameter 0.3 mm and add in the granulating disc, pass into 80 ℃ of hot blasts;
2) spray above-mentioned granulation slow-release material with the two-fluid spray gun in described granulating disc, consumption is 30 % of ammonium chloride powder;
3) screening after the granular ammonium chloride work in-process drying after the granulation, the cooling is obtained particle diameter at the macrobead ammonium chloride finished product of 2-4.75 mm, sieve the after crushed again granulation of underproof part.
The granule strength of prepared macrobead slowly-releasing ammonium chloride fertilizer is 71 N.
Embodiment 3
(1) granulation slowly-releasing material preparation:
1) in reactor, adds 144.0 g urea, add 360.0 g water, stirring makes its dissolving, be that 30 % potassium hydroxide solutions are regulated pH value 10 with mass concentration, add 45.0 g Paraformaldehyde 96s, stir 1.0 h at 90 ℃, then add 21.6 g trimeric cyanamides, and regulate pH value 10, continue to stir 0.5 h;
2) being that 30 % phosphoric acid solutions are regulated pH value 6.0 with mass concentration, continuing to stir 0.5 h at 90 ℃, is that 30 % potassium hydroxide are regulated pH value 9.0 with mass concentration, and cooling, discharging make described granulation slow-release material.
The solid content 33.5% of prepared granulation slow-release material, slowly-releasing available nitrogen massfraction is 9.5 %.
(2) preparation of macrobead slowly-releasing ammonium chloride fertilizer:
1) takes by weighing 5.0 following kg ammonium chloride powder of particle diameter 0.3 mm and add in the small-sized rotary drum granulator, pass into 90 ℃ of hot blasts;
2) spray above-mentioned granulation slow-release material with the two-fluid spray gun in described rotary drum granulator, consumption is 5 % of ammonium chloride powder;
3) screening after the granular ammonium chloride work in-process drying after the granulation, the cooling is obtained particle diameter at the macrobead ammonium chloride finished product of 2-4.75 mm, sieve the after crushed again granulation of underproof part.
The granule strength of prepared macrobead slowly-releasing ammonium chloride fertilizer is 32 N.
Embodiment 4
(1) granulation slowly-releasing material preparation:
1) in reactor, adds 135.0 g urea, add 540.0 g water, stirring makes its dissolving, be that 30 % potassium hydroxide solutions are regulated pH value 8.5 with mass concentration, adding 165.0 g mass concentrations is 40 % acetaldehyde solution, stirs 2.0 h at 75 ℃, then adds 13.5 g nitration of lignin, and regulate pH value 8.5, continue 1.0 h after;
2) being 30 % sulphuric acid soln acid for adjusting pH value 5.0 with mass concentration, continuing to stir 1.5 h at 75 ℃, is that 30 % potassium hydroxide solutions are regulated pH value 7.5 with mass concentration then, and cooling, discharging make described granulation slow-release material.
Solid content 23.9 % of prepared granulation slow-release material, slowly-releasing available nitrogen massfraction is 28.5 %.
(2) preparation of macrobead slowly-releasing ammonium chloride fertilizer:
1) takes by weighing the following 5.0 kg ammonium chloride powder of particle diameter 0.3 mm and add in the small-sized rotary drum granulator, pass into 80 ℃ of hot blasts;
2) spray above-mentioned granulation slow-release material with the two-fluid spray gun in described granulating disc, consumption is 15 % of ammonium chloride powder;
3) screening after the oven dry of the granular ammonium chloride work in-process after the granulation, the cooling is obtained particle diameter at the macrobead ammonium chloride finished product of 2-4.75 mm, sieve the after crushed again granulation of underproof part.
The granule strength of prepared macrobead slowly-releasing ammonium chloride fertilizer is 47 N.
Embodiment 5
(1) granulation slowly-releasing material preparation:
1) in reactor, adds 84.0 g urea, add 420.0 g water, stirring makes its dissolving, be that 30 % sodium hydroxide solutions are regulated pH value 9.5 with mass concentration, add 36.0 g isobutyric aldehydes, stir 1.5 h at 70 ℃, then add 21.0 g Sumstar 190s, and regulate pH value 9.5, continue to stir 0.5 h;
2) regulating pH value 5.5 with tosic acid, continue to stir 0.5 h at 70 ℃, is that 30% sodium hydroxide solution is regulated pH value 8.5 with mass concentration then, and cooling, discharging make described granulation slow-release material.
Solid content 23.8 % of prepared granulation slow-release material, slowly-releasing available nitrogen massfraction is 30.1 %.
(2) preparation of macrobead slowly-releasing ammonium chloride fertilizer:
1) takes by weighing the following 2.0 kg ammonium chloride powder of particle diameter 0.3 mm and add in the small-sized disc tablets press, pass into 85 ℃ of hot blasts;
2) spray above-mentioned granulation slow-release material with the two-fluid spray gun in described granulating disc, consumption is 20 % of ammonium chloride powder;
3) screening after the granular ammonium chloride work in-process drying after the granulation, the cooling is obtained particle diameter at the macrobead ammonium chloride finished product of 2-4.75 mm, sieve the after crushed again granulation of underproof part.
The granule strength of prepared macrobead slowly-releasing ammonium chloride fertilizer is 51 N.
Embodiment 6
(1) granulation slowly-releasing material preparation:
1) in reactor, adds 135.0 g urea, add 607.5 g water, stirring makes its dissolving, be that 30 % sodium hydroxide are regulated pH value 9.5 with mass concentration, the mass concentration that adds 72.5 g of metering is 40 % glyoxal solutions, stirs 1.0 h at 85 ℃, then adds 40.5 g Vltra tearss, and regulate pH value 9.5, continue to stir 0.5 h;
2) being that 30 % phosphoric acid solutions are regulated pH value 5.5 with mass concentration, continuing to stir 0.5 h at 85 ℃, is that 30 % sodium hydroxide are regulated pH value 8.5 with mass concentration then, and cooling, discharging make described granulation slow-release material.
Solid content 20.7 % of prepared granulation slow-release material, slowly-releasing available nitrogen massfraction is 28.0 %.。
(2) preparation of macrobead slowly-releasing ammonium chloride fertilizer:
1) takes by weighing the following 5.0 kg ammonium chloride powder of particle diameter 0.3 mm and add in the small-sized rotary drum granulator, pass into 85 ℃ of hot blasts;
2) spray above-mentioned granulation slow-release material with the two-fluid spray gun in described rotary drum granulator, consumption is 25 % of ammonium chloride powder;
3) screening after the granular ammonium chloride work in-process drying after the granulation, the cooling is obtained particle diameter at the macrobead ammonium chloride finished product of 2-4.75 mm, sieve the after crushed again granulation of underproof part.
The granule strength of prepared macrobead slowly-releasing ammonium chloride fertilizer is 54 N.
Claims (10)
1. the granulation slow-release material of a macrobead slowly-releasing ammonium chloride fertilizer is characterized in that: comprise urea, aldehyde, properties-correcting agent, acidic substance, alkaline matter and water; Wherein, the mol ratio of described urea and aldehyde is 1-5:1; The quality of described properties-correcting agent is the 0-30 % of urea quality; Described acidic substance and alkaline matter are used for the pH value of regulation system; The quality of described water is urea quality 2-5 times.
2. granulation slow-release material according to claim 1, it is characterized in that: described granulation slow-release material is to contain the urea aldehyde of the nutrient slowly-released effect of certain nitrogen or the aqueous solution of modified urea-formaldehyde, and its solid content is 15-40 %.
3. granulation slow-release material according to claim 1 and 2, it is characterized in that: described aldehyde is a kind of or its arbitrary combination in the following aldehyde: formaldehyde, Paraformaldehyde 96, acetaldehyde, propionic aldehyde, butyraldehyde-n, isobutyric aldehyde, phenyl aldehyde, furfural, crotonic aldehyde, myristic aldehyde, aubepine, oxalic dialdehyde, mda, suceinic aldehyde, glutaraldehyde, hexanedial.
4. granulation slow-release material according to claim 1 and 2, it is characterized in that: described properties-correcting agent is a kind of or its arbitrary combination in the following substances: starch, Sumstar 190, Mierocrystalline cellulose, methylcellulose gum, Natvosol, hydroxyethylmethyl-cellulose, Vltra tears, carboxymethyl cellulose, hydroxypropylcellulose, xylogen, nitration of lignin, chitosan, soybean protein, glucose, fructose, lactose, sucrose, maltose, molasses, Weibull, trimeric cyanamide, polyvinyl alcohol, gum arabic, gelatin.
5. granulation slow-release material according to claim 1 and 2, it is characterized in that: described acidic substance are a kind of or its arbitrary combination in the following substances: hydrochloric acid, sulfuric acid, phosphoric acid, nitric acid, formic acid, tosic acid.
6. granulation slow-release material according to claim 1 and 2, it is characterized in that: described alkaline matter is a kind of or its arbitrary combination in the following substances: sodium hydroxide, potassium hydroxide, calcium oxide, ammoniacal liquor, thanomin, diethanolamine, trolamine.
7. the granulation slowly-releasing material preparation method described in according to claim 1 and 2 is characterized in that carrying out according to the following steps:
(1) in reactor, adds the urea that measures, add urea quality 2-5 water doubly, stirring makes the urea dissolving, regulate pH value 7.5-10 with alkaline matter, mol ratio by urea and aldehyde is the amount adding aldehyde of 1-5:1, stirs 0.5-2 h at 70-90 ℃, then adds the properties-correcting agent that quality is urea quality 0-30%, control pH value 7.5-10 continues to stir 0.5-1 h;
(2) regulate pH value 4.5-6.5 with acidic substance, continue to stir 0.5-1.5 h at 70-90 ℃, then regulate pH value 7.5-10 with alkaline matter, cooling, discharging namely get described granulation slow-release material.
8. macrobead slowly-releasing ammonium chloride fertilizer is characterized in that: take commercial ammonium chloride powder as base fertilizer, utilize one of any described granulation slow-release material of the claim 1-6 bonded pelleting of reuniting to make.
9. macrobead slowly-releasing ammonium chloride fertilizer according to claim 8, it is characterized in that: described granulation slowly-releasing material usage is the 2-30% of ammonium chloride base fertilizer quality.
10. preparation method who prepares macrobead slowly-releasing ammonium chloride fertilizer claimed in claim 9 may further comprise the steps:
(1) the ammonium chloride powder below particle diameter 0.3 mm is added in granulating disc or the rotary drum granulator, be preheated to 50-90 ℃;
(2) spray one of any described granulation slow-release material of the claim 1-6 of the 1-30 % that accounts for ammonium chloride base fertilizer quality on the material in the described granulating disc of step (1) or the rotary drum granulator;
(3) screening obtains particle diameter at the macrobead slowly-releasing ammonium chloride fertilizer finished product of 2-4.75 mm after the particulate slow-release ammonium chloride fertilizer work in-process drying after the granulation, the cooling, sieves the after crushed again granulation of underproof part.
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| CN107266195A (en) * | 2017-07-17 | 2017-10-20 | 山东新朝阳作物营养有限公司 | It is a kind of that there is fertilizer of sustained release water retaining function and preparation method thereof |
| CN109633008A (en) * | 2018-12-28 | 2019-04-16 | 沈阳中科新型肥料有限公司 | A kind of method of a methylenediourea and dimethylene triurea in detection urea-formaldehyde fertilizer |
| CN110423163A (en) * | 2019-09-03 | 2019-11-08 | 河北农业大学 | A kind of corn slow-release or control-release fertilizer |
| CN117623825A (en) * | 2023-12-13 | 2024-03-01 | 史丹利农业集团股份有限公司 | Preparation method and application of stable fertilizer |
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| CN103601601A (en) * | 2013-11-12 | 2014-02-26 | 丹阳市清云农业发展有限公司 | Novel coated controlled release fertilizer and preparation method thereof |
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| CN104926517A (en) * | 2015-06-19 | 2015-09-23 | 上海化工研究院 | Production device of double-function slow-release nitrogen fertilizer and application of production device |
| CN104926517B (en) * | 2015-06-19 | 2018-02-02 | 上海化工研究院有限公司 | A kind of preparation facilities of difunctional slow-release nitrogen fertilizer and its application |
| CN106565361A (en) * | 2015-10-08 | 2017-04-19 | 王兆博 | Process for producing general-purpose double-effect scientific fertilizer |
| CN105175155A (en) * | 2015-10-13 | 2015-12-23 | 黑龙江中农欣欣农业科技发展有限公司 | Device and method for improving urea formaldehyde compound fertilizer on amino acid compound fertilizer production line |
| CN105732128A (en) * | 2016-02-24 | 2016-07-06 | 江苏省农业科学院 | Protein hydrolysate modified urea formaldehyde slow-release fertilizer and preparation method thereof |
| CN105732128B (en) * | 2016-02-24 | 2019-11-05 | 江苏省农业科学院 | A kind of protolysate modified urea formaldehyde slow-release fertilizer and preparation method thereof |
| CN105646087A (en) * | 2016-03-03 | 2016-06-08 | 湖北农业科学院果树茶叶研究所 | Preparation method of long-acting slow-release fertilizer special for tea trees |
| CN106380280A (en) * | 2016-08-29 | 2017-02-08 | 湖南新合作三维农资有限公司 | Slow release fertilizer containing humic acid and preparation method thereof |
| CN106396911A (en) * | 2016-08-30 | 2017-02-15 | 湖南新合作三维农资有限公司 | Nitro-sulfur based sustained-release fertilizer and preparation method thereof |
| CN107056339A (en) * | 2016-12-26 | 2017-08-18 | 中化化肥有限公司临沂农业研发中心 | A kind of method that low temperature concentrated solution method directly granulates production ureaformaldehyde slow-release compound fertilizer |
| CN107266195A (en) * | 2017-07-17 | 2017-10-20 | 山东新朝阳作物营养有限公司 | It is a kind of that there is fertilizer of sustained release water retaining function and preparation method thereof |
| CN109633008A (en) * | 2018-12-28 | 2019-04-16 | 沈阳中科新型肥料有限公司 | A kind of method of a methylenediourea and dimethylene triurea in detection urea-formaldehyde fertilizer |
| CN110423163A (en) * | 2019-09-03 | 2019-11-08 | 河北农业大学 | A kind of corn slow-release or control-release fertilizer |
| CN117623825A (en) * | 2023-12-13 | 2024-03-01 | 史丹利农业集团股份有限公司 | Preparation method and application of stable fertilizer |
| CN117623825B (en) * | 2023-12-13 | 2024-05-10 | 史丹利农业集团股份有限公司 | Preparation method and application of stable fertilizer |
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