CN107353071A - It is a kind of directly by the method for urea liquid slurry-spraying pelletizing compound fertilizer making - Google Patents
It is a kind of directly by the method for urea liquid slurry-spraying pelletizing compound fertilizer making Download PDFInfo
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- CN107353071A CN107353071A CN201610297222.3A CN201610297222A CN107353071A CN 107353071 A CN107353071 A CN 107353071A CN 201610297222 A CN201610297222 A CN 201610297222A CN 107353071 A CN107353071 A CN 107353071A
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
- C05G5/00—Fertilisers characterised by their form
- C05G5/10—Solid or semi-solid fertilisers, e.g. powders
- C05G5/12—Granules or flakes
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05B—PHOSPHATIC FERTILISERS
- C05B7/00—Fertilisers based essentially on alkali or ammonium orthophosphates
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05C—NITROGENOUS FERTILISERS
- C05C9/00—Fertilisers containing urea or urea compounds
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- Pest Control & Pesticides (AREA)
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Abstract
The present invention discloses a kind of directly by the method for urea liquid slurry-spraying pelletizing compound fertilizer making; concentration is more than into the 70.0%, urea liquid of 80~140 DEG C of temperature to spray on the base fertilizer of Nitrogen-and Phosphorus-containing potassium and the mixture of other additives in comminutor, through being granulated, drying, cooling down, sieving and produce nitrogen phosphorus, nitrogen potassium or NpK complex fertilizer.This invention simplifies flow, mitigates drying load, improves balling ratio, reduces production cost, product quality is stable, prevented from caking and efflorescence.
Description
Technical field
The invention belongs to technical field of chemical fertilizer production, and in particular to a kind of directly by the method for urea liquid slurry-spraying pelletizing Nitrogen-and Phosphorus-containing, nitrogen potassium or NpK complex fertilizer.
Background technology
At present, it is flourishing in chemical fertilizer industry as modern agriculture the reach of science, the development of domestic and international complex fertilizer are occupied an leading position in chemical fertilizer industryCountry, the use of complex fertilizer accounted for the 70%~80% of the total dosage of chemical fertilizer.Complex fertilizer is mainly by nitrogenous, phosphorus, the base fertilizer of potassium; such as urea, phosphorus ammonium, potassium chloride are after mixing; in comminutor; at certain temperature and amount of liquid phase; by itself bonding force or the appropriate binding agent of addition; through extruding, bonding, reunion balling-up, then the qualified products after drying, cooling, screening.In addition to phosphoric acid, phosphate fertilizer etc. for the composite fertilizer of matrix, also using urea as matrix and other phosphorus, the Chemical Mixed Fertilizer of potash fertilizer mixing granulation.
The production method of complex fertilizer mainly has granulating method, slurry-spraying pelletizing method, extruder grain method and blending method etc., and they belong to base fertilizer and carry out secondary operation and the manufactured complex fertilizer containing various nutrient elements such as nitrogen, phosphorus, potassium.Granulating method is the production method of the widely used compound fertilizer secondary operation in China, and the method production process is simple, and operation is easy to grasp, and product particle shape is good；But exist and be granulated institute's water requirement height, drying load is big, the relatively low weakness of product strength, and product nitrogen content does not reach higher level.The technique of extruder grain method is simple, and production cost is low, but the insufficient strength of extruder template, frequently changes, causes more stopping production；The water content of product is general higher, and shape of product is poor, broken in transporting procedures.Blending method is to mix various base particle fertilizer, higher to the granular of raw material, density requirements, and easily caking, should not be store long.Slurry-spraying pelletizing method directly utilizes nitrogen, phosphorus, potassium slurry (can also use solid fertilizer through dissolving or melting) in fertilizer time processing process units, by itself heat and pressure, with returning charge or fresh solid fertilizer slurry-spraying pelletizing.The method reduces many production processes, reduces energy consumption, therefore product cost is low.The production of domestic complex fertilizer typically uses granulating method and slurry-spraying pelletizing method.
The content of the invention
It is an object of the invention to provide a kind of method that nitrogen phosphorus, nitrogen potassium or NpK complex fertilizer are directly produced by urea liquid.This method overcomes the shortcomings that traditional granulating method urea-base compound fertilizer nitrogen content is low, and product cost is high, reduces cost to greatest extent.This method utilizes the urea liquid and solid fertilizer producing composite fertilizer by liquor jetting pelletting material of high concentration, or urea, MAP, Diammonium phosphate (DAP), potassium acid sulfate etc. to enter comminutor with solution or molten state, with solid fertilizer slurry-spraying pelletizing compound fertilizer making.
It is another object of the present invention to add appropriate additive in urea liquid, so that manufactured compound fertilizer has higher intensity.
The further object of the present invention is in Fertilizer production process, and the granulated fertilizer after screening makes fertilizer have higher agglomeration preventing performance during accumulating, pile by coating, face powder processing.
The present invention general principle be：Using urea liquid, ammonium phosphate solution, the amount of liquid phase of potassium hydrogen sulfate solution and its higher temperature, the powdered fertilizer surface of nitrogenous, phosphorus, potassium etc. is directly sprayed onto, granular composite fertilizer is made in slurry-spraying pelletizing at a higher temperature.
In compound fertilizer production, the product of certain specification, it is granulated required amount of liquid phase and is basically unchanged, and the solubility of various raw material fertilizer increases with the rise of temperature.Therefore, in order to reach the amount of liquid phase needed for being granulated, in granulation process, some raw material fertilizer are added with the liquid under higher temperature, are granulated required moisture with regard to less.So, low temperature drying can be used in technique or without drying process, so as to significantly reduce drying load.Meanwhile using the viscosity (viscosity for being significantly better than water) of urea liquid, ammonium phosphate solution, potassium hydrogen sulfate solution etc., make the balling ratio of granulation higher.
What the present invention was realized in.The present invention preparing composite N-P-K fertilizer directly from urea solution method be by the concentration in urea plant be 70.0%~99.7% urea liquid; or solid urea adds water, heats concentration made from melting more than the urea liquid that 70%, temperature is 80~140 DEG C; spray on the mixture of the nitrogenous, phosphorus in comminutor, the base fertilizer of potassium and other additives, NpK complex fertilizer is produced through drying, cooling, screening, face powder, coating after granulation.
The method of the preparing composite N-P-K fertilizer directly from urea solution of the present invention, described base fertilizer is one or more of mixtures in urea, ammonium nitrate, sulphur ammonium, MAP, Diammonium phosphate (DAP), nitrophosphate fertilizer, double superhosphate, normal superphosphate, calcium magnesium phosphate, potassium dihydrogen phosphate, potassium chloride, potassium sulfate, potassium nitrate, potassium acid sulfate.The kind and addition of the base fertilizer of addition need to be depending on the nutrient of base fertilizer and final products, moisture.If base fertilizer is graininess, need first to crush.
The method of the preparing composite N-P-K fertilizer directly from urea solution of the present invention, the state that described base fertilizer enters comminutor can be solid or solution or suspension or fused solution.MAP, Diammonium phosphate (DAP), potassium acid sulfate add comminutor preferably with following manner：MAP, Diammonium phosphate (DAP) are that ammonia and phosphoric acid are directly reacted into comminutor in tubular reactor；Potassium acid sulfate is directly entered comminutor after being reacted after being mixed with phosphoric acid in tubular reactor with ammonia.
Due to Fertilizer application seasonal variety the characteristics of, compound fertilizer period of storage is longer, thus produce efflorescence.The method of the preparing composite N-P-K fertilizer directly from urea solution of the present invention, organic and inorganic additive can be added to improve product strength in described urea liquid, prevent efflorescence.Wherein organic additive is one or more of mixtures in formaldehydes material, polyvinyl alcohol, fatty alkanol amide, pollopas, amino nitrile, sodium carboxymethylcellulose, binary organic acid.Inorganic additive is one or more of mixtures in sodium carbonate, sodium acid carbonate, sodium sulphate, ammonium sulfate, zinc sulfate, manganese sulfate, ammonium nitrate, ammonium phosphate, ammonium chloride, potassium chloride, magnesia, sodium tripolyphosphate.
The method of the preparing composite N-P-K fertilizer directly from urea solution of the present invention, due to adding more urea, therefore more liquid phase is produced under higher temperature after material melts, influence drying process.So described drying machine gas inlet temperature is 120~200 DEG C, preferably 150~170 DEG C.
Further, since compound fertilizer hygroscopicity is stronger, so easily being lumpd during storage.In order to effectively prevent from luming, it is necessary to the granular complex fertilizer after screening, applied powder, coating processing.Coating agent used is one or more of mixtures in alkylamine, olefin alkylation diamide compound, paraffin, white oil, vegetable oil, mineral oil, alkene, diene copolymers, Lauxite, glue, sulphur.Face powder used is peat, one or more of mixtures in lignite, zeolite, sepiolite, attapulgite, dicyandiamide, humate, periclase, potassium feldspar, carclazyte, bentonite, montmorillonite, calcium magnesium phosphate.
The method of the preparing composite N-P-K fertilizer directly from urea solution of the present invention has the following advantages that compared with prior art：
1. directly being produced using urea concentrated solution, flow is simplified, reduces production stage, reduces operating cost, therefore reduce cost.The product structure of urea production producer is improved simultaneously.
2. use brand-new production technology, the amount of liquid phase of slurry in itself after the reaction heat of phosphoric acid and ammonia, the reaction heat of potassium acid sulfate and ammonia and reaction is made full use of, the temperature and amount of liquid phase of urea liquid, material moisture is granulated and significantly reduces, therefore drying load is reduced, saves energy consumption.
3. the adaptability to raw material of the present invention is strong, product specification adjustment is flexible, can produce various urea-based N and Ks, nitrogen phosphorus or NpK complex fertilizer.
4. the compound fertilizer product of the present invention, the smooth rounding of particle, intensity height is prevented from caking, shelf-stable.
Embodiment
Below by embodiment, the invention will be further elaborated.
Embodiment 1：
The urea liquid 84kg that concentration is 95% (percentage by weight, similarly hereinafter), temperature is 125 DEG C, is squeezed into rotary drum granulator with pump, while powder ammonium phosphate is added in comminutor and (contains N 16%, P2O546%) 330kg, potassium chloride (contain K2O 56%) 270kg, ammonium chloride (containing N 22.5%) 280kg, attapulgite 80kg, after about 10min granulations, into drying machine, 170 DEG C of drying machine gasinlet temperature, dried through cocurrent and remove moisture, adverse current is cooled to 30 DEG C, then is sieved, coating, packaging, just obtains 1~4.75mm of granularity compound fertilizer.Product aqueous 1.54%, compression strength 18N, containing N-P2O5-K2O is 15-15-15, and particle rounding is smooth.
Embodiment 2：
The urea liquid 135kg that concentration is 95%, temperature is 125 DEG C, is squeezed into spray granulation drier with pump, while squeezes into the 347kg98% concentrated sulfuric acid with 193kg potassium chloride after 120 DEG C are reacted about 2h by pump, and supplying contains P2O523.27% phosphoric acid,diluted 497.5kg, spray granulation drier is sprayed into after being reacted after mixing in tubular reactor with 70kg ammonias, through being further dried, cooling down, sieving, coating, be made and contain N-P2O5-K2O is 17-11.5-11.5, and compression strength 24N, granularity is the compound fertilizer of 1~4.75mm particle rounding.
Embodiment 3：
By 315kg concentration be 70% with pump, the urea liquid that temperature is 125 DEG C squeeze into spray granulation drier, add containing K2O is 60% potassium chloride, while 430kg is contained into P2O535% phosphoric acid and 58kg ammonias spray into spray granulation drier after tubular reactor reacts, then by being further dried, cool down, sieve, be made after coating and contain N-P2O5-K2O is 17-17-17, and compression strength 20N, granularity is the compound fertilizer of 1~4.75mm particle rounding.
Embodiment 4：
The urea liquid 365kg that concentration is 90%, temperature is 125 DEG C, spray granulation drier is squeezed into pump, meanwhile, 575kg contains P2O535% phosphoric acid and 58kg ammonias spray into spray granulation drier after tubular reactor reacts, then by being further dried, cool down, sieve, be made after coating and contain N 21%, containing P2O521% urine base nitro phosphor complex, granule strength 20N, granularity are 1~4.75mm.
Claims (3)
- It is 1. a kind of directly by the method for urea liquid slurry-spraying pelletizing compound fertilizer making; it by the concentration in urea plant is 70.0%~99.7% (weight to be; similarly hereinafter); or it is 80~140 DEG C of urea liquid that solid urea, which adds water, concentration made from heating to be more than 70%, temperature, sprays into containing in comminutor On nitrogen, phosphorus, the base fertilizer of potassium and the mixture of ammonium chloride and attapulgite additive; produce nitrogen phosphorus, nitrogen potassium, NpK complex fertilizer through drying, cooling, screening, face powder, coating after granulation, it is characterised in that MAP in base fertilizer, Diammonium phosphate (DAP) are ammonia and phosphoric acid reacted directly in tubular reactor after enter comminutor；Potassium acid sulfate is the reaction product of sulfuric acid and potassium chloride, is mixed after reaction with phosphoric acid, and comminutor is directly entered after then being reacted in tubular reactor with ammonia.
- 2. the method as described in claim 1, it is characterised in that the coating agent is alkylamine, alkene One or more kinds of mixtures in hydrocarbon alkyl diamide complexes compound, paraffin, white oil, vegetable oil, mineral oil, alkene, diene copolymers, Lauxite, glue, sulphur.
- 3. the method as described in claim 1, it is characterised in that described face powder be peat, lignite, One or more kinds of mixtures in zeolite, sepiolite, attapulgite, dicyandiamide, humate, periclase, potassium feldspar, carclazyte, bentonite, montmorillonite, calcium magnesium phosphate.
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| CN201610297222.3A CN107353071A (en) | 2016-05-09 | 2016-05-09 | It is a kind of directly by the method for urea liquid slurry-spraying pelletizing compound fertilizer making |
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| CN201610297222.3A CN107353071A (en) | 2016-05-09 | 2016-05-09 | It is a kind of directly by the method for urea liquid slurry-spraying pelletizing compound fertilizer making |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108997039A (en) * | 2018-07-02 | 2018-12-14 | 安徽六国化工股份有限公司 | A kind of N P and K boron compound fertilizer preparation process |
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- 2016-05-09 CN CN201610297222.3A patent/CN107353071A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108997039A (en) * | 2018-07-02 | 2018-12-14 | 安徽六国化工股份有限公司 | A kind of N P and K boron compound fertilizer preparation process |
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Application publication date: 20171117 |
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