CN105294363A - Formula and film-coating preparation method for biological carbon coated urea - Google Patents
Formula and film-coating preparation method for biological carbon coated urea Download PDFInfo
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- CN105294363A CN105294363A CN201410286966.6A CN201410286966A CN105294363A CN 105294363 A CN105294363 A CN 105294363A CN 201410286966 A CN201410286966 A CN 201410286966A CN 105294363 A CN105294363 A CN 105294363A
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
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- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
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- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P60/00—Technologies relating to agriculture, livestock or agroalimentary industries
- Y02P60/20—Reduction of greenhouse gas [GHG] emissions in agriculture, e.g. CO2
- Y02P60/21—Dinitrogen oxide [N2O], e.g. using aquaponics, hydroponics or efficiency measures
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Abstract
The invention relates to a formula and a film-coating preparation method for biological carbon coated urea. The biological carbon coated urea is characterized in that the outside of a fertilizer core is coated with solid-powder-shaped biological carbon, sulfur, dicyandiamide and bentonite by using granular urea with a size of 3 to 4 mm as the fertilizer core and oxidized corn starch as bonding liquid, wherein the above-mentioned components have weight proportions as follows: 50 to 80 parts of the urea, 10 to 30 parts of the biological carbon, 2 to 10 parts of the sulfur, 2 to 3 parts of the dicyandiamide, 2 to 3 parts of the bentonite and 3 to 5 parts of the corn starch. The film-coating preparation method for the biological carbon coated urea comprises the following steps: placing the urea into a disc granulator, carrying out preheating with hot air for 5 min, spraying the bonding liquid on the surface of the urea with a high-pressure spray gun, blowing the hot air for 3 to 5 min, adding a mixed film-coating material into the disc granulator in batches and carrying out rotating for 10 min, then spraying the bonding liquid again, and carrying out drying in the air so as to obtain the biological carbon coated urea. According to the invention, the biological carbon can improve physical and chemical properties of soil and adsorb ammonium-nitrogen and nitrate-nitrogen ions; the dicyandiamide reduces nitrification; and S4O62- generated by decomposition of the sulfur can delay decomposition of the dicyandiamide, and H+ and S2O32- generated by decomposition of the sulfur can inhibit nitrification. The biological carbon coated urea provided by the invention has the advantages of low ammonia volatilization, slow generation of nitrate nitrogen, low nitrogen loss and high nitrogen effectiveness.
Description
Technical field
The present invention relates to a kind of formula and coating preparation method thereof of charcoal coated carbamide.Utilize charcoal electrochemical properties, nitrification inhibitor, to the inhibition of nitrogen transformation related microorganism, is combined release-controlled coated material; And form at urea outside surface the coated urea that one deck coating reaches slowly-releasing fertilizer efficiency speed under room temperature, condition of normal pressure.
Background technology
China is that nitrogenous fertilizer consumes the first big country, and unit surface uses nitrogenous fertilizer to be also significantly higher than external prosperity
country.Excessive applied nitrogen, not only causes utilization rate of fertilizer low, and nitrogen fertilizer in agriculture has become one of Chinese water quality deterioration important factor to water body migration; Excessive chemical nitrogen fertilizer of using also aggravates greenhouse gas emission.Common urea decomposes soon in soil, its nitrogen rate of release is asynchronous with the right nitrogen demand of most Crop growing stage, have to take (topdressing) method of repeatedly applying fertilizer to regulate, alleviate this contradiction, but repeatedly apply fertilizer and inevitably increase labor cost.For this reason, people in the industry is constantly devoted to efficiency slow release or control release technic and fertilizer research.With urea for fertile core, in the coated layer of substance of its appearance, control release rate of nitrogen, realize nitrogen slowly-releasing or controlled release, its product is coated slow-release/Controlled Release Nitrogen Fertilizer.Such as, sulfur coated urea, Polymer coated urea etc.Using sulphur or superpolymer (resin, rubber, Mierocrystalline cellulose, starch etc.), as coated fertilizer, urea slow transits through coating layer and outwards discharges, and avoids urea fast decoupled and release for they.Compare with common urea, slow-release carbamide effectively can improve utilization rate of nitrogen fertilizer, reduces ammonia volatilization and N leaching, runoff loss, also effectively can reduce Nitrate Accumulation in Vegetable, improves quality of vegetable.Although the research and development of domestic and international slow-release carbamide achieve very much progress with using, in existing slow-release nitrogen fertilizer kind, complex process, needs specific equipment, and cost is high, limit its extensively, spread.For sulfur coated urea, need in production at high temperature under high pressure by solid-state sulphur melting, then by high-pressure pump, liquid sulfur is sprayed into fluidized-bed suspension coating tower, film is carried out to the urea granules entered from coating tower top.Finally cooling, dry, packaging.And various polymer capsule slow-release fertilizer also needs first to carry out dissolving with flux to superpolymer makes its post liquefaction just can enter fluidized-bed suspension coating tower to urea to carry out coating, there is volatilization and the recovery problem of solvent.In addition, the existing slow-release carbamide coated fertilizer overwhelming majority is organic chemicals, and in pedo relict, difficult decomposition, is unfavorable for soil quality.Sulfur coating urea, it is current more satisfactory slow-release carbamide kind, its envelope components sulphur is one of crop alimentary element, be particularly suitable for using in a lack of sulfur soil, also be adapted at using in meta-alkalescence soil, in not a lack of sulfur soil, use sulfur coated urea, sulphur can not play should have effect, wastes Sulphur ressource.But sulfur coated urea complex process, needs Special Equipment, invest higher.Due to coating process restriction, the difficult material adding other control hydrolysis of urea, nitrogen release in the slow-release carbamide coated fertilizer that existing market uses, and coated fertilizer itself only can be relied on to act on.Therefore, efficient, cheap, eco-friendly slow-release carbamide coated fertilizer is developed and coated carbamide production technique has important practical usage.
Biomass charcoal is the solid-state powdered granule material of height aromatize infusibility formed by plant biomass pyrolysis charring under 300-700 DEG C of anaerobic in low temperature condition.Existing research confirms, because charcoal has stronger adsorptive power, containing certain mineral nutrients and active substance, in soil, add charcoal, to soil physico-chemical property, there is improved effect, can soil quality be improved, increase crop yield, effectively can reduce Nitrate N leaching, improve utilization rate of nitrogen fertilizer, reduce nitrogen application to the negative impact of Water quality; And soil stability carbon storehouse can be improved.Therefore, suggestion soil application charcoal, as an agronomic measures, includes conventional agriculture production management in.But directly to soil application charcoal, reach ideal effect, number ratio is comparatively large, and cost compare is high; Charcoal is thin, directly uses, is easily blown to four winds, and even injures labor author eyes.In view of charcoal vesicular structure, electric density is high, has feature such as absorption ammonium, nitrate etc., possesses release-controlled coated material substance feature.China's crop material Biological resources are enriched, and adopt outdoor simple and easy burning mode contaminate environment, and utilization approaches needs to be expanded.Cheap crop material biomass material is prepared into through suitably processing the charcoal base coated fertilizer being applicable to do slow release fertilizer, prepare environment-friendly type slow release fertilizer, not only can effectively solve crop material disposal difficulties, crop material waste material is made to obtain efficiency utilization, and when can realize stable crop yield again, remarkable minimizing chemical fertilizer nitrogenous fertilizer usage quantity, reduces agricultural land soil N nutrient loss, and effectively containment agricultural non-point pollution is on the impact of water surrounding.
Dyhard RU 100 (DCD) suppresses nitrification by suppressing nitrite bacteria, is that the DCD adding 2% nitrogen content can not only suppress nitrification, does not also have apparent side effect to soil at present with one of a kind of nitrification inhibitor.Therefore, in coated carbamide mould material, add Dyhard RU 100 and there is Nitrification Inhibition.But DCD easily decomposes in soil, effect is unstable, and persistence is short.Therefore, slow down DCD decomposition will be conducive to improving DCD inhibiting nitrification effect.
Sulphur (elementary sulfur) is decomposed into SO in soil
4 2-in process, produce S
2o
3 2-, S
4o
6 2-two kinds of intermediates.Research confirms, S
2o
3 2-can effectively suppress soil NH
4 +to NO
3 -transform, S
4o
6 2-dCD can be alleviated decompose.Sulphur is decomposed to form H
+ion, reduce soil pH, low pH will be unfavorable for NH
4 +to NO
3 -transform.Therefore, in coated carbamide mould material, Dyhard RU 100 is added and sulphur has suppression nitrification.
Wood charcoal powder directly adds in the solution of Nitrogen-and Phosphorus-containing potassium nutrition by Korea S ModabberAhmedKhan, prepares Biological carbon base compound fertilizer by absorption method, and earth pillar is cultivated washing tests and to be confirmed in composite fertilizer prepared by the method that npk nutrient can slow Stable Release.Lu Guang far etc. adopts tackiness agent that powdered carbon and chemical fertilizer are mixed with charcoal based compound fertilizer.Field test confirms, Mu Shi 72kg composite fertilizer (nitrogenous 18%, containing charcoal 37%) can increase corn yield 7-11%.Because consumption in nitrogenous fertilizer agriculture production is maximum, volume increase obvious, but the fertilizer that environmental risk is larger, therefore, crop material biomass charcoal is combined with slow-release fertilizer production technology, explore a kind of
novelcharcoal film-coated and slow release fertilizer, will have practical significance and market outlook in agriculture production, waste material utilization and environment protection etc.At present, biomass charcoal prepared by application crop material biomass low temperature pyrogenation, as coated fertilizer, is produced carbon-base slow release fertilizer product and agriculturally has no report.Charcoal coated slow-release urea is prepared in this research, adopt greenhouse pot culture and field experiment to compare difference that Conventional urea and charcoal base coated carbamide use ammonia volatilization, Nitrogen Leaching, soil pH value and vegetable crop, to for charcoal is agricultural and charcoal coated carbamide is rationally applied and provided scientific basis on crop.
Summary of the invention
The present invention seeks to the coating formula proposing a kind of coated carbamide, and propose with low cost, technique is simple, pollution-free, the coated carbamide technology of preparing problem of nitrogen sustained release rate appropriateness.
The technical scheme of the coated fertilizer formula of the coated carbamide that the present invention solves is as follows:
A kind of coated fertilizer of charcoal coated carbamide and the preparation method of charcoal coated carbamide, be made up of with the coating layer being coated on urea surface the urea of core layer, it is characterized in that: this coating layer is made up of biological powdered carbon, Dyhard RU 100, SULPHUR POWDER, wilkinite and W-Gum, the weight of this coating layer is the 20-50% of gross weight, wherein biomass charcoal powder 10-30%, SULPHUR POWDER 2-10%, Dyhard RU 100 2-3%, wilkinite 2-3%, W-Gum 3-5%, its thickness is at about 190-780 μm.It is characterized in that: the solid powdery mixture that this coating layer is four or more is formed.
It is characterized in that: the granularity of this solid powdery mixture should >=100 orders.
It is characterized in that: the particle diameter of this urea is 3-4mm.
The manufacture method of above-mentioned charcoal coated carbamide, is characterized in that:
1, by quantitative particulate form shape urea, put it in granulating disc, preheating about 5min.
2, W-Gum 100g is dissolved in 200ml water, 2ml sulphuric acid catalysis is added under continuous stirring, then 10ml potassium permanganate solution oxidation 1h is added, add 8g sodium hydroxide gelatinization 20min, add 2g borax and be cross-linked 15min, add the Sumstar 190 binding agent being concentration 14% after suitable quantity of water fully stirs.
3, spray appropriate oxidised maize starch binder solution with high-pressure spray gun in urea surface, consumption is advisable with not adhered to one another between urea granules, passes into hot blast 3-5min.
4, after a certain amount of coating solid powder material mixing, the 20-30% adding required coating layer weight under stirring is being rotated further.
5, cohere after on urea granules until the solid coated fertilizer more than 95% or 95% added, adding small amounts corn starch solution.
6, again the solid coating powder of 20-30% is added in the tablets press be rotated further.
7,5-7 operation is repeated till solid coating powder is all coated on urea granules surface.
The present invention has following advantage:
1, the present invention utilizes " solid-liquid " to react film forming mechanism, and based on the biomass charcoal of agricultural crop straw cold and oxygen deficient charing and inorganic mineral amendment, its coated fertilizer cost is low.
2, agricultural crop straw is of a great variety, and wide material sources are easy to get, and does not limit by raw material supply.
3, oxidised maize starch itself is the organic nonpollution material of viscosity of liquid, and therefore the present invention need not use solvent to carry out liquefaction processing to coated fertilizer, does not also exist and causes the pollution of environment and the investment problem of solvent recuperation due to solvent evaporates.
4, whole production process is carried out at normal temperatures, both saves energy consumption, again reduces production unit requirement, uses general granulating disc to produce, and is conducive to vast middle-size and small-size fertilizer plant and utilizes existing installation to produce coated slow release fertilizer.
5, had good sustained release effect: because charcoal is aterrimus organic products, be rich in micropore, there is extremely strong ion adsorption capacity and water-retentivity, after being manured into soil, not only can Continuous slow release fertilizer ion, reduce the leaching loss, runoff etc. of fertilizer, can preserve for a long time at normal temperatures, mixing granulation oven dry and unaffected can be carried out with other organic and inorganic fertilizers.
6, economic environmental protection: the present invention produces the raw material mainly agriculture waste maize straw of charcoal, raw material is waste resource recycling inherently, and with low cost; Charcoal is produced, the energy-conservation and environmental protection of production process with semiclosed low-temperature carbonization furnace anoxic destructive distillation decomposition technique; Charcoal is derived from plant organism, and itself belongs to organic double compound, and main component is carbon, can natural decomposition in soil, complete noresidue, thus in use to environment without any pollution, have the long-lasting nature of improvement soil concurrently simultaneously.
7, product application is in extensive range, synergism is obvious: charcoal coated carbamide of the present invention has completed preliminary proportioning test and small serial production at 2012-2014, in lab simulation, potted plant and small area field experiment, achieves good experiment effect.Within 2013, in the crops such as Yunnan vegetables, carry out pilot scale, effect is all comparatively obvious, by checking and accepting.Up to now, compared with contrast field, use charcoal coated slow-release nitrogenous fertilizer field speed of emergence of the present invention fast, Miao Qi, Miao Zhuan, output are high, can improve per mu yield about 10%, reduce ammonia volatilization about 10% simultaneously, reduce Nitrogen Leaching and reach 50%.
8, Environmental Effect Analysis: use this charcoal film coated urea fertilizer can reduce ammonia volatilization about 10%, reduces Nitrogen Leaching about 50%.
Accompanying drawing explanation
fig. 1charcoal coated carbamide of the present invention and common urea Nitrogen Accumulation solubility rate (under normal temperature and pressure common urea and charcoal coated carbamide Nitrogen Accumulation solubility rate) under normal temperature and pressure flooding condition.
fig. 2charcoal coated carbamide of the present invention and common urea on the impact of pea-pods output and nitrogen loss (using the impact on pea-pods output and nitrogen loss of common urea and charcoal coated carbamide).
Embodiment
The present invention utilizes " solid-liquid " to react film forming mechanism, use the oxidised maize starch solution of pressed powder charcoal, SULPHUR POWDER, Dyhard RU 100, wilkinite and liquid state as coated fertilizer, urea granules parcel is wherein formed the coated slow release fertilizer that can control nutrients release.The granularity of the solid powdery coated fertilizer used should >=100 orders, and the diameter of urea granules should be 3-4mm and is advisable, and can have good slow release effect like this.Coating layer is made up of biological powdered carbon, Dyhard RU 100, SULPHUR POWDER, wilkinite and W-Gum, the weight of this coating layer is the 20-50% of gross weight, wherein biomass charcoal powder 10-30%, SULPHUR POWDER 2-10%, Dyhard RU 100 2-3%, wilkinite 2-3%, W-Gum 3-5%, its thickness is at about 190-780 μm.
Its operation steps is as follows:
1, by the oxidised maize starch solution after the urea granules of Weighing and a small amount of metering, mix in the disk that it rotates, adhere to urea granules surface with making aqueous oxidised maize starch dissolution homogeneity;
2, under being rotated further, adding the coating powder of the 20-30% weight of metering, and spraying the oxidised maize starch solution after a small amount of metering;
3, after the solid coating powder more than 95% or 95% added is bonded in urea granules surface, then the oxidised maize starch solution added after a small amount of metering is rotated further;
4, after oxidised maize starch dissolution homogeneity to be added attaches to urea granules surface, then the solid inorganic mineral dust adding 20-30% is rotated further;
5, the operation of repeating step 3-4 is till directly only solid coating powder is all coated on coating fertilizer surface.
The present invention can take out after above-mentioned process in tablets press, need not carry out drying cooling again, can carry out finished product packing warehouse-in.
By the following examples the present invention is further set forth:
Embodiment 1
1, utilize local agricultural wastes, if vegetables, flowers, maize straw are as charcoal raw materials for production, by raw material pulverizing, dry the biomass charcoal 40kg that rear low-temperature carbonization becomes porous;
2, the coated fertilizer be made up of the biological powdered carbon of 30kg, 12kg SULPHUR POWDER, 2kg Dyhard RU 100 is mixed; And 3kg W-Gum is made binding liquid, 3kg wilkinite as bonding pulvis; With 50kg granular urea for fertile core carries out parcel granulation.
3, the material after the granulation of granulating disc parcel enters drier, and obtaining granular biological charcoal coated slow-release urea through cooling screening is 95kg, wherein total nutrient (N+P
2o
5+ K
2o) be 29.5kg, total nitrogen content is 25kg, and charcoal is 28kg, and organic matter is 16.8kg.
Below by way of test example, beneficial effect of the present invention is further elaborated:
Test example 1
1, contrast conventional fertilizer application and charcoal coated carbamide two process are established in this experiment
(1) contrast conventional fertilizer application group (Urea) and charcoal coated carbamide group (BCU) is established; (2) Urea group: every basin (1kg soil) amount of nitrogen is 0.2g, applies as base manure is disposable; BCU group: every basin (1kg soil) amount of nitrogen is 0.2g, applies as base manure is disposable; The each process of phosphorus potassium sowing amount is all identical, and every basin phosphate fertilizer sowing amount is 0.275g, and every basin potash fertilizer sowing amount is 0.062g.(3) repeat 4 times, amount to 8 basins, potted plant experiment soil used belongs to Kunming vegetable field red soil, and in soil fertility, to plant vegetables be intensive shadow on lung in institute, and kind is magnificently assist No. 1, and vegetative period is about 60 days.
2, test results and analysis:
Intensive shadow on lung uses the seedling rate that charcoal coated carbamide can promote vegetables, grows, and improves output, and quality improves.Plant strain growth is healthy and strong, and blade is generous, and look dark green, output increased.The average economic yield of the every basin of each process of intensive shadow on lung (3 strain) is respectively: 33.8g (Urea group), 36.3g (BCU group).Apply fertilizer compared with Urea group with contrast, BCU group improves output 6.9%, reduces ammonia volatilization 5.5%, minimizing total nitrogen leaching loss about 58.5%, raising soil pH about 0.94.
Test example 2
1, contrast conventional fertilizer application and charcoal coated carbamide two process are established in this experiment:
(1) contrast conventional fertilizer application group (Urea) and charcoal base coated carbamide group (BCU) is established; (2) Urea group: every mu of amount of nitrogen is 20kg purity nitrogen, point applies for 4 times, and the ratio that applies is by base manure-topdress-topdress-topdress (30-20-30-20); BCU group: every mu of amount of nitrogen is 20kg purity nitrogen, and apply as base manure is disposable.The each process of phosphorus potassium sowing amount is all identical, and every mu of phosphate fertilizer (calcium superphosphate) sowing amount is 27kg, and potash fertilizer (Repone K) sowing amount is 25kg.(3) repeat 3 times, the arrangement of field plot design completely random, every plot area 30m
2, amount to 6 communities, vegetable field field soil belongs to yellow-red soil, and in soil fertility, field physical features is smooth, the same land for growing field crops of field management, and pea-pods kind is red colored thin,tough silk pod No. 1, growth number of days about 100 days.
2, test results and analysis:
Charcoal coated carbamide of the present invention used by pea-pods, germinates early, together, well developed root system, plant strain growth is healthy and strong, and plant height is apparently higher than CK and Urea group, and blade is generous, and look dark green, output increased.Urea group enters the collecting period in mid-October, and BCU group postponement 3 days; The whole collecting period, the average economic yield (amounting to into per mu yield) of each process is respectively: 821.2kg (Urea group), 901.5kg (BCU group).Compared with conventional fertilizer application Urea group, BCU group improves output 8.9%, reduces ammonia volatilization 20.8% simultaneously, reduces total nitrogen leaching loss 27.8%, improves soil pH about 0.31.
The present invention has excellent urea controlled release characteristics, itself and common urea in water the same day Nitrogen Accumulation solubility rate respectively as shown in Figure 1.As seen from the figure, common urea stripping substantially within the same day of throwing in, and the present invention's stripping slowly gradually within considerable time.And Production of Large Fields test display, under the condition waiting nitrogen quantity, stimulation ratio can reach 9%, and as shown in Figure 2, and the present invention only need apply as base manure is disposable concrete numeral, and the common urea of contrast then divides and applies for four times, has saved the amount of labour used of fertilising.
Claims (12)
1. a charcoal base coated carbamide, be made up of with the coating layer being coated on urea surface the urea of core layer, it is characterized in that: coating layer is by biomass charcoal, Dyhard RU 100, sulphur and binding agent (wilkinite, W-Gum) form, coating layer weight ratio accounts for 20-50% (the nitrogenous 39.4-24.7% of fertilizer), and wherein charcoal accounts for 10-30%, and Dyhard RU 100 accounts for 2-3%, sulphur accounts for 2-10%, and binding agent accounts for 5-8%.Membrane wrapping thickness 190-780 μm.
2. charcoal coated carbamide according to claim 1, is characterized in that: described solid coating layer by biomass charcoal, Dyhard RU 100, sulphur, wilkinite composition mixture.
3. the charcoal coated carbamide according to claim 1 and 2, is characterized in that: the granularity of coating layer material should be greater than 100 orders.
4. charcoal coated carbamide according to claim 1, is characterized in that: the urea of described core layer is the granular urea of 3-4mm particle diameter, and nitrogen content is 46.6%.
5. the charcoal coated carbamide according to claim 1 and 2, is characterized in that: described biomass charcoal is that under the biomass anaerobic in low temperature conditions such as agricultural crop straw, charing forms charcoal.
6. the charcoal coated carbamide according to claim 1 and 2, is characterized in that: described Dyhard RU 100, code name DCD.White crystalline powder, it suppresses nitrification by suppressing nitrite bacteria, delays nitric nitrogen and is formed, reduce Nitrate Nitrogen Leaching.DCD suitable amounts is the 5-10% of fertilizer nitrogen quantity.
7. the charcoal coated carbamide according to claim 1 and 2, is characterized in that: described sulphur is the simple substance sulphur powder of commercially available prod.Sulphur decomposes under oxidative conditions, and producing hydrogen ion and sulfate ion, is nitrification inhibitor, also can reduce Dyhard RU 100 rate of decomposition simultaneously, and hydrionic generation reduces soil and charcoal pH, reduces urea decomposition and produces ammonia volatilization.
8. the charcoal coated carbamide according to claim 1 and 2, is characterized in that: described binding agent is W-Gum and bentonitic mixture, and mixed weight ratio is 1: 1.
9. charcoal coated carbamide binding agent according to claim 8, is characterized in that wilkinite directly mixes with biological powdered carbon the viscosity increasing coating material.After W-Gum is water-soluble, under constantly stirring, add sulphuric acid catalysis, add quantitative potassium permanganate solution oxidation, add sodium hydroxide gelatinization, add borax to be again cross-linked, add after suitable quantity of water fully stirs and be oxidised maize starch binding agent, be sprayed at particle surface for High Pressure Gun.
10. charcoal coated carbamide according to claim 1, is characterized in that: the nitrogen content 24.7-39.4% of described fertilizer.
11. charcoal coated carbamides according to claim 1, is characterized in that: moisture≤5% of described fertilizer.
The preparation method of 12. charcoal coated carbamides according to claim 1, is characterized in that, comprise the following steps:
1) by 3-4mm particulate form urea, granulating disc is put into, with hot-air pre-heating about 5min;
2) then spray appropriate oxidised maize starch bonding solution with high-pressure spray gun in urea surface, consumption is advisable with not adhered to one another between urea granules, passes into hot blast 3-5min;
3) then after a certain amount of solid coated fertilizer charcoal, sulphur, Dyhard RU 100, wilkinite mixing; spraying a small amount of moisture makes it moistening; put into granulating disc; rotate about 10min; spray into binder solution again; operation like this 3 times, can be wrapped on granular urea by coated fertilizer, make charcoal coated carbamide.
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| CN113402323A (en) * | 2021-07-08 | 2021-09-17 | 百色学院 | Special fertilizer for sugarcane primary root zone and preparation process thereof |
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| CN114478130A (en) * | 2022-01-26 | 2022-05-13 | 天津农学院 | Biomass degradable slow-release nitrogen fertilizer and preparation method thereof |
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