CN102040427A - Method for producing chlorine-based high phosphorus compound fertilizer by ammoniation method - Google Patents
Method for producing chlorine-based high phosphorus compound fertilizer by ammoniation method Download PDFInfo
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Abstract
The invention discloses a method for producing a chlorine-based high phosphorus compound fertilizer by an ammoniation method. The method is characterized by directly introducing gas ammonia to a material layer of a rotary drum granulator to increase the neutralization degree of monoammonium phosphate, granulating gas ammonia with other powdered fundamental fertilizers containing nitrogen, phosphorus and potassium and obtaining the compound fertilizer containing nitrogen, phosphorus and potassium through drying, cooling, screening and enveloping after granulation. The method has the following advantages: the heat producing reaction between the gas ammonia and double superphosphate and heat of neutralization generated by the reaction between the gas ammonia and the monoammonium phosphate are fully used of to maintain the temperature of the materials, and the solubility of ammonium phosphate salt is improved to satisfy the liquid phase quantity needed by granulation; the higher granulation rate can be ensured without adding other adhesives, thus lowering the input cost of the materials; and the moisture of the materials to be granulated is obviously reduced, thus reducing the drying load and saving plenty of energy.
Description
Technical field
The present invention relates to a kind of high phosphorus composite fertilizer producing process, be specifically related to a kind of method that the three elements complex fertilizer of nitrogenous, phosphorus, potassium is made in the granulation of industrial chemicals ammonia that in the granulating method production technique, adds.
Background technology
At present, along with modern agricultural development, the development of composite fertilizer is both at home and abroad occupied an leading position in chemical fertilizer industry, and in chemical fertilizer industry developed country, the composite fertilizer consumption has accounted for 70% ~ 80% of fertilizer amount.Composite fertilizer mainly is the base fertilizer with nitrogenous, phosphorus, potassium; as urea, ammonium chloride, phosphorus ammonium, Repone K etc. after mixing; in tablets press; under certain temperature and amount of liquid phase; rely on the bounding force of self or add an amount of tackiness agent; the reunion granulating, compound fertilizer product is made in drying, cooling, screening again.
Compound fertilizer production method mainly contains granulating method, spray granulating method, extrusion process and blending method etc., and they all are to belong to that base fertilizer carries out secondary processing and the content made has the composite fertilizer of multiple elements such as nitrogen, phosphorus, potassium.
As shown in Figure 1; prior art utilizes the method for granulating method production Nitrogen, Phosphorus and Potassium may further comprise the steps: with raw material such as Repone K; monoammonium phosphate; ammonium chloride; urea etc. enter rotary drum granulator behind computer metering; simultaneously urea melting or steam evenly are sprayed on the material in the rotary drum granulator; after the physical mixed granulation; enter one section drying system successively; two sections drying systems; oven dry is after cooling system enters screening; the material of saturating sieve does not return rotary drum granulator after pulverizing; saturating screen sections enters packing machine; prevent the caking processing, after feed bin stores, pack.
Above-mentioned granulating method production technology is the widely used production method of China, and this method production process is simple, and operation is easy to grasp, but stock yard does not have chemical reaction in the production process, is the physics granulation process, exists to make material institute water requirement height, need to add a large amount of steaming G﹠Ws, because the water content height of material increase the subsequent drying load, and the granule strength of product is low, product strength is between 8N-12N, particle is rough, is added the influence of stopping composition, and product color is bad.
Summary of the invention
The purpose of this invention is to provide production method, be applicable to the product of p2o5 〉=15% based on the production chloro high phosphorus composite fertilizer of granulating method.
Another object of the present invention is by adding ammonia, making full use of its chemical reaction heat and reduce product moisture, so that the compound manure of making has higher intensity.
Further purpose of the present invention is that the tail gas to production process carries out carrying out washing treatment, and washing water are utilized again, be used to provide granulating must amount of liquid phase.So that waste gas, wastewater zero discharge in composite fertilizer's production process make more friendly environment of composite fertilizer's production process.
In order to solve the problems of the technologies described above; the technical solution used in the present invention is the production method of the high phosphorus composite fertilizer of a kind of ammoniation process chloro; in granulating method composite fertilizer produces; gas ammonia is directly led in the bed of material of rotary drum granulator; the powdery base fertilizer granulation of, phosphorus nitrogenous with other, potassium, drying, cooling, screening, coating obtain nitrogen, phosphorus, K compound fertilizer after the granulation.
Specifically, the production method of the high phosphorus composite fertilizer of described ammoniation process chloro may further comprise the steps:
(1) in granulating method high phosphorus chlorine-based compound fertilizer is produced, the powdery base fertilizer of nitrogenous, phosphorus, potassium is entered rotary drum granulator behind computer metering, lead in the bed of material of rotary drum granulator after the liquefied ammonia gasification by the mass percent 3%-5% that accounts for total input material quantity, in rotary drum granulator, finish granulation process, temperature of charge is controlled at 60-70 ℃, granulation time 3～7min in the rotary drum granulator;
(2) after the granulation, material enters dryer, and the dryer temperature is controlled at 100-115 ℃, drying time 20～40 min;
(3) after the oven dry, material enters the cooling system cooling, sieves through dusting cover screening and scalping respectively after the cooling; the macrobead of pulverulent material behind the dusting cover after scalping returns tablets press through fragmentation; salable product enter packing machine, prevent the caking processing, pack after feed bin stores.
The content of p2o5 〉=15% in the finished product, and replenish the required amount of liquid phase of granulating with granulation tail vapour washing water.
Between the sieve diameter 2.0-3.0mm of dusting cover screening, between the sieve diameter 4.0-4.5mm of scalping screening.
The powdery base fertilizer of described nitrogenous, phosphorus, potassium is several mixtures in monoammonium phosphate and double superhosphate and urea, ammonium chloride, ammonium sulfate, Repone K, the vitriolate of tartar, and the base fertilizer kind of adding and add-on need be looked nutrient, the moisture of the finished product and be determined.
Described urea add-on surpasses 20% of input amount total amount quality, then needs broken back to add.
The production method of the high phosphorus composite fertilizer of ammoniation process chloro of the present invention compared with prior art has following advantage:
1, utilize gas ammonia in rotary drum granulator, to finish granulation process; the neutralization heat that makes full use of thermopositive reaction, gas ammonia and the monoammonium phosphate reaction of gas ammonia and double superhosphate adds thermal material; improve the solubleness of ammonium phosphate salt simultaneously; to satisfy the required amount of liquid phase of granulating; the granulation material moisture obviously reduces, and reduces drying load.
2, adaptability to raw material of the present invention is strong, and formula for a product is fit to produce high-phosphorus products (p2o5 〉=15%).
3, compound fertilizer product of the present invention: the smooth rounding of particle, color is pure white, intensity height, prevented from caking, anti-storage.
4, in the production process by tail gas is carried out carrying out washing treatment, and utilize washing water to replenish the required amount of liquid phase of granulating.Accomplished waste gas, wastewater zero discharge in composite fertilizer's production process, made more friendly environment of composite fertilizer's production process.
Need not to add again any tackiness agent when 5, producing and just can reach good balling-up situation, realize no stopping composition granulation, reduce production costs.
Description of drawings
Fig. 1 is the method flow diagram that prior art is utilized granulating method production Nitrogen, Phosphorus and Potassium.
Fig. 2 is the production method schema of the high phosphorus composite fertilizer of ammoniation process chloro of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments the present invention is described in further detail:
The production method (being applicable to the product of p2o5 〉=15%) of the high phosphorus composite fertilizer of ammoniation process chloro of the present invention; gas ammonia is directly led in the bed of material of rotary drum granulator; increase the degree of neutralization of monoammonium phosphate; the powdery base fertilizer granulation of, phosphorus nitrogenous with other, potassium, drying, cooling, screening, coating obtain nitrogen, phosphorus, K compound fertilizer after the granulation.
Specifically, described ammoniation process chloro high phosphorus compound fertilizer producing method may further comprise the steps:
Specifically, described ammoniation process chloro high phosphorus compound fertilizer producing method may further comprise the steps:
, in granulating method chloro high phosphorus composite fertilizer produces (being applicable to the product of p2o5 〉=15%), lead in the bed of material of rotary drum granulator after the liquefied ammonia gasification by the mass percent 3%-5% that accounts for total input material quantity, phosphorus in the pulverulent material usually source is monoammonium phosphate and double superhosphate, and substitute steam as the required amount of liquid phase of granulating with the tail gas generated by granulation washing water, tackiness agent need not be added in the production process, just higher balling ratio can be obtained;
⑵, other is nitrogenous, the powdery base fertilizer of phosphorus, potassium enters rotary drum granulator behind computer metering, in rotary drum granulator, finish granulation process with gas ammonia, the neutralization heat that makes full use of thermopositive reaction, gas ammonia and the monoammonium phosphate reaction of gas ammonia and double superhosphate in the granulation process adds thermal material, improve the solubleness of ammonium phosphate salt simultaneously, to satisfy the required amount of liquid phase of granulating, temperature of charge is controlled at 60-70 ℃, granulation time 3～7min in the rotary drum granulator;
⑶ after, the granulation, material enters dryer, and the dryer temperature is controlled at 100-115 ℃, drying time 20～40 min;
⑷ after, the oven dry, material enters the cooling system cooling, sieves through dusting cover screening and scalping respectively after the cooling; the macrobead of pulverulent material behind the dusting cover after scalping returns tablets press through fragmentation; salable product enter packing machine, prevent the caking processing, pack after feed bin stores.
The water that step (1) adds is the washing water that the wash reel tablets press is discharged tail gas.
Between the sieve diameter 2.0-3.0mm of dusting cover screening, between the sieve diameter 4.0-4.5mm of scalping screening.
The powdery base fertilizer of described nitrogenous, phosphorus, potassium is several mixtures in monoammonium phosphate and double superhosphate and urea, ammonium chloride, ammonium sulfate, Repone K, the vitriolate of tartar, and the base fertilizer kind of adding and add-on need be looked nutrient, the moisture of the finished product and be determined.。
Described urea add-on surpasses 20% of input amount total amount quality, then needs broken back to add.
Principle of the present invention is: the neutralization heat that makes full use of thermopositive reaction, gas ammonia and the monoammonium phosphate reaction of gas ammonia and double superhosphate in the granulation process adds thermal material, improves the solubleness of ammonium phosphate salt simultaneously, to satisfy the required amount of liquid phase of granulating., phosphorus nitrogenous, potassium powdered fertilizer with other, under higher temperature, the granulating of under the effect of rotary drum granulator, reuniting.
NH3+H
3PO
4=(NH
4) H
2PO
4+ heat
NH3+(NH
4) H
2PO
4=(NH
4) 2HPO
4+ heat
During composite fertilizer produces, the product of different ingredients, the required amount of liquid phase of its granulating is different, and the solubleness of various raw materials is to increase along with the rising of temperature, utilize the reaction heat of gas ammonia and monoammonium phosphate and double superhosphate to improve the solubleness of other raw material, this has also increased the required amount of liquid phase of granulating.But also can adjust the ammonia consumption according to different prescription (contained p2o5 what), increase amount of liquid phase and reaction heat.Like this, can adopt cryodrying on the technology, thereby significantly reduce drying load.Utilize the increase of the solubleness of monoammonium phosphate simultaneously, need not to add again any tackiness agent and just can reach good balling-up situation.
The production method of the high phosphorus composite fertilizer of ammoniation process chloro of the present invention, described raw material is urea, ammonium chloride, ammonium sulfate, monoammonium phosphate, double superhosphate, Repone K, vitriolate of tartar etc.The nutrient that base fertilizer kind that adds and add-on need be looked the finished product, moisture are determined.If the urea add-on surpasses 20% of input amount quality, then need broken back to add.
Ammoniation process chloro high phosphorus compound fertilizer producing method of the present invention, the state that described base fertilizer enters tablets press is a solid, has so just reduced production processes such as urea melting.
Because fertilizer uses changes of seasons, the compound manure waiting time is longer, therefore can produce efflorescence.A material atomizing reason is exactly that product strength is low by analysis, the moisture height, the product that adopts the method for propylhomoserin tubular reactor produced Nitrogen, Phosphorus and Potassium of the present invention to produce, product particle intensity can reach more than the 15N, therefore moisture≤1.8% does not exist particle atomizing problem.
Ammoniation process chloro high phosphorus compound fertilizer producing method of the present invention, owing to made full use of ammonia react heat, the dryer temperature is controlled at 100-115 ℃ just can guarantee ordinary production, even add more urea, a large amount of liquid phases that the material melting brings can not produce owing to can not influence the subsequent drying operation yet.And traditional granulating method production technique is owing to add a large amount of steaming G﹠Ws, and the dryer temperature need be controlled at 150-200 ℃, like this can be because the urea melting produce a large amount of liquid phases, and influence production is normally carried out when serious.
In addition, because the compound manure water absorbability is stronger, easily lump when depositing.In order to prevent caking, need carry out anti-caking to the fertilizer after the screening and handle.Can apply powder, coating handles.
The invention will be further elaborated below by example:
Embodiment 1:15-25-10 product
Gas ammonia (contains N 82.3%; mass percent; 35 kilograms down together); after metering with joining in the rotary drum granulator bed of material; add urea through computer metering simultaneously and (contain N46.2; the adding of broken back) 110 kilogram; 110 kilograms of ammonium chlorides (containing N23.5); powdery monoammonium phosphate (contains N 11%; P2O5 45%) 380 kilograms; 200 kilograms of double superhosphate (containing P2O5 38.5%); 180 kilograms in Repone K (containing K2O56%); above-mentioned pulverulent material mixes in tablets press with gas ammonia; make full use of the thermopositive reaction of gas ammonia and double superhosphate in the granulation process; the neutralization heat of gas ammonia and monoammonium phosphate reaction adds thermal material; improve the solubleness of ammonium phosphate salt simultaneously; to satisfy the required amount of liquid phase of granulating; and substitute steam as the required amount of liquid phase of granulating with the tail gas generated by granulation washing water; temperature of charge is controlled at 70 ℃ in the rotary drum granulator; after the 3min granulation; enter drying machine; drying machine inlet gas temperature is 110 ℃; dry 20 minutes; cool off after the drying; respectively through the screening of sieve diameter 2.0-3.0mm dusting cover and sieve diameter 4.0-4.5mm scalping screening, the macrobead of the pulverulent material behind the dusting cover after scalping returns tablets press through fragmentation after the cooling, and salable product enter packing machine; prevent the caking processing; coating, packing obtains the compound manure that granularity is 2-4.5mm.Product is moisture 1.6%, and intensity 16N contains N-P2O5---and K2O is 14.7-24.8-10.1, and particle is smooth, rounding, pure white.
Embodiment 2:13-22-10 product
Gas ammonia (contains N 82.3%; mass percent; 30 kilograms down together); after metering with joining in the rotary drum granulator bed of material; simultaneously add ammonium chloride (containing N23.5) 290 kilograms through computer metering; powdery monoammonium phosphate (contains N 11%; P2O5 45%) 320 kilograms; 200 kilograms of double superhosphate (containing P2O5 38.5%); 180 kilograms in Repone K (containing K2O56%); above-mentioned pulverulent material mixes in tablets press with gas ammonia; make full use of the thermopositive reaction of gas ammonia and double superhosphate in the granulation process; the neutralization heat of gas ammonia and monoammonium phosphate reaction adds thermal material; improve the solubleness of ammonium phosphate salt simultaneously; to satisfy the required amount of liquid phase of granulating; and substitute steam as the required amount of liquid phase of granulating with the tail gas generated by granulation washing water; temperature of charge is controlled at 70 ℃ in the rotary drum granulator; after the 3min granulation; enter drying machine; drying machine inlet gas temperature is 110 ℃; dry 20 minutes; cool off after the drying; sieve through the screening of sieve diameter 2.0-3.0mm dusting cover and sieve diameter 4.0-4.5mm scalping respectively after the cooling; the macrobead of pulverulent material behind the dusting cover after scalping returns tablets press through fragmentation; salable product enter packing machine; prevent the caking processing; coating, packing obtains the compound manure that granularity is 2-4.5mm.Product is moisture 1.7%, and intensity 16N contains N-P2O5---and K2O is 12.7-22.1-10.1, and particle is smooth, rounding, pure white.
Embodiment 3:17-17-17 high-phosphorus products
Gas ammonia (contains N 82.3%; mass percent; 30 kilograms down together); after metering with joining in the rotary drum granulator bed of material; add urea through computer metering simultaneously and (contain N46.2; the adding of broken back) 200 kilogram; 90 kilograms of ammonium chlorides (containing N23.5); powdery monoammonium phosphate (contains N 11%; P2O5 45%) 290 kilograms; 100 kilograms of double superhosphate (containing P2O5 38.5%); 300 kilograms in Repone K (containing K2O56%); above-mentioned pulverulent material mixes in tablets press with gas ammonia; make full use of the thermopositive reaction of gas ammonia and double superhosphate in the granulation process; the neutralization heat of gas ammonia and monoammonium phosphate reaction adds thermal material; improve the solubleness of ammonium phosphate salt simultaneously; to satisfy the required amount of liquid phase of granulating; and substitute steam as the required amount of liquid phase of granulating with the tail gas generated by granulation washing water; temperature of charge is controlled at 70 ℃ in the rotary drum granulator; after the 3min granulation; enter drying machine; drying machine inlet gas temperature is 110 ℃; dry 20 minutes; cool off after the drying; respectively through the screening of sieve diameter 2.0-3.0mm dusting cover and sieve diameter 4.0-4.5mm scalping screening, the macrobead of the pulverulent material behind the dusting cover after scalping returns tablets press through fragmentation after the cooling, and salable product enter packing machine; prevent the caking processing; coating, packing obtains the compound manure that granularity is 2-4.5mm.Product is moisture 1.5%, and intensity 18N contains N-P2O5---and K2O is 17-16.9-16.8, and particle is smooth, rounding, pure white.
Ammoniation process chloro high phosphorus granulation of compound fertilizer then is to introduce industrial chemicals liquefied ammonia, the reaction heat that makes full use of gas ammonia and monoammonium phosphate and double superhosphate improves the solubleness of other raw material, this has also increased the required amount of liquid phase of granulating, but also can adjust the ammonia consumption according to different prescription (contained p2o5 what), increase amount of liquid phase and reaction heat, containing the high phosphorus composite fertilizer of fertilizer processing and fabricating chloro of elements such as nitrogen, phosphorus, potassium with other, is chemical reaction granulating technology.The granulation balling ratio of ammonification technology can reach 60-80%, and common process has only 40-60%.
The present invention has overcome the shortcoming that product energy consumption height, product appearance are coarse, balling ratio is low, product cost is high that traditional granulating method makes, and reduces cost to greatest extent, has improved quality product to greatest extent.By adding industrial chemicals ammonia aborning, the neutralization heat that makes full use of thermopositive reaction, gas ammonia and the monoammonium phosphate reaction of gas ammonia and double superhosphate adds thermal material, improve the solubleness of ammonium phosphate salt simultaneously, to satisfy the required amount of liquid phase of granulating, change traditional way and need add the way of a large amount of steaming G﹠Ws as the granulating amount of liquid phase, and need not add tackiness agent, product cost has reduction significantly.
The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (6)
1. the production method of the high phosphorus composite fertilizer of ammoniation process chloro; it is characterized in that; in granulating method composite fertilizer produces; gas ammonia is directly led in the bed of material of rotary drum granulator; the powdery base fertilizer granulation of, phosphorus nitrogenous with other, potassium, drying, cooling, screening, coating obtain nitrogen, phosphorus, K compound fertilizer after the granulation.
2. the production method of the high phosphorus composite fertilizer of ammoniation process chloro according to claim 1 is characterized in that, may further comprise the steps:
(1) in granulating method high phosphorus chlorine-based compound fertilizer is produced, the powdery base fertilizer of nitrogenous, phosphorus, potassium is entered rotary drum granulator behind computer metering, lead in the bed of material of rotary drum granulator after the liquefied ammonia gasification by the mass percent 3%-5% that accounts for total input material quantity, in rotary drum granulator, finish granulation process, temperature of charge is controlled at 60-70 ℃, granulation time 3～7min in the rotary drum granulator;
(2) after the granulation, material enters dryer, and the dryer temperature is controlled at 100-115 ℃, drying time 20～40 min;
(3) after the oven dry, material enters the cooling system cooling, sieves through dusting cover screening and scalping respectively after the cooling; the macrobead of pulverulent material behind the dusting cover after scalping returns tablets press through fragmentation; salable product enter packing machine, prevent the caking processing, pack after feed bin stores.
3. the production method of the high phosphorus composite fertilizer of ammoniation process chloro according to claim 2 is characterized in that, the content of p2o5 〉=15% in the finished product, and replenish the required amount of liquid phase of granulating with granulation tail vapour washing water.
4. the production method of the high phosphorus composite fertilizer of ammoniation process chloro according to claim 2 is characterized in that, between the sieve diameter 2.0-3.0mm of dusting cover screening, between the sieve diameter 4.0-4.5mm of scalping screening.
5. the production method of the high phosphorus composite fertilizer of ammoniation process chloro according to claim 2, it is characterized in that, the powdery base fertilizer of described nitrogenous, phosphorus, potassium is several mixtures in monoammonium phosphate and double superhosphate and urea, ammonium chloride, ammonium sulfate, Repone K, the vitriolate of tartar, and the base fertilizer kind of adding and add-on need be looked nutrient, the moisture of the finished product and be determined.
6. the production method of the high phosphorus composite fertilizer of ammoniation process chloro according to claim 5 is characterized in that, described urea add-on surpasses 20% of input amount total amount quality, then needs broken back to add.
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