CN104355734A - Production method of ammonium sulfate-ammonium phosphate composite fertilizer - Google Patents
Production method of ammonium sulfate-ammonium phosphate composite fertilizer Download PDFInfo
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- CN104355734A CN104355734A CN201410571433.2A CN201410571433A CN104355734A CN 104355734 A CN104355734 A CN 104355734A CN 201410571433 A CN201410571433 A CN 201410571433A CN 104355734 A CN104355734 A CN 104355734A
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05B—PHOSPHATIC FERTILISERS
- C05B7/00—Fertilisers based essentially on alkali or ammonium orthophosphates
Abstract
The invention discloses a production method of an ammonium sulfate-ammonium phosphate composite fertilizer. The composite fertilizer adopts the conventional ammonium phosphate double tubular reactor process; materials required for production mainly comprise strong phosphoric acid with concentration (P2O5) of 40 percent to 48 percent, anhydrous liquid ammonia with high purity and concentrated sulfuric acid with concentration of 90.0 percent to 98.5 percent; the strong phosphoric acid, the liquid ammonia and the concentrated sulfuric acid enter a tubular reactor in a certain ratio according to the specification of the product, neutralization reaction is performed to generate mixed slurry of ammonium sulfate and ammonium phosphate and ammonification and pelletization are carried out by a drum to form the ammonium phosphate-based nitrogen-phosphorus-sulfur (NPS) composite fertilizer. The product disclosed by the invention is rich in nutritional ingredients, such as ammonium nitrogen, soluble phosphate and soluble sulfate, so that the requirements of plant production for nitrogen, phosphorus and sulfur elements are met effectively, the functionality of the ammonium phosphate composite fertilizer is expanded, the added value of the product is improved, and an effective way is provided for promoting diversification of the fertilizer product.
Description
Technical field
The present invention relates to fertilizer field, particularly a kind of production method of the ammonium phosphate composite fertilizer containing element sulphur.
Background technology
Diammonium phosphate is the quick-acting composite fertilizer of a kind of binary, produces required nutritive element containing nitrogen, phosphorus two kind of plant.In the face of production capacity surplus, the impact that market is seriously saturated, it is imperative that differentiation strategy is pursued by chemical fertilizers production enterprise.Features of DAP production technique and quality product single, its binary compound fertilizer presents certain limitation.Along with the emergence of multi-component composite fertilizer industry and the progress of widespread use and Technology thereof, ammonium phosphate production technique carried out improving and optimizes, formed containing plurality of specifications trace element compound fertilizer, expansion product type, improves quality product very urgent.
Sulphur is the indispensable a kind of nutritive element of crop growth, nearly all protein, enzyme all contain sulphur composition, the existence form of sulphur has free state and chemical combination state, the fertilizer of sulfur-bearing mainly comprises ammonium sulfate, potassium sulfate etc., the resistance such as the existence of element sulphur in organism can improve the quantity of sulfhedryl in object, and raising biology is cold-resistant, drought-enduring and resistant to lodging.But its nutritive ingredient is single, fertilizer efficiency is comprehensive and efficient not as good as multi-component composite fertilizer, fails effectively and long period promotes overall growth and the volume increase of plant.Some areas lack element sulphur, extremely unfavorable to the production of plant, by improving distribution and the nutrients ratio structure of fertilizer chemical composition, improving the performance of fertilizer, making up the deficiency that soil is rare to sulphur, can effective guarantee soil balanced to requirement elements.
At present, the domestic method that there is part producing sulfur-containing fertilizer, but main sulfur-bearing composite heat transfer adds sulphur simple substance by adopting, if the sulphur of molten state is as production ways, or to wrap up the mode of coating, or to incorporate the mode of slip, sulphur enters in chemical fertilizer in liquid form, and under chemical industry high-temperature high-pressure state, sulphur is as the inflammable and explosive solid of one, there is certain risk in production process, need complicated technological design thus the security of guarantee technique.In addition, elemental sulfur is insoluble in water, is totally reduced by the direct assimilated efficiency of plant.
Summary of the invention
The present invention is directed to the problems referred to above to be optimized ammonium phosphate production technique, the production containing ammonium phoaphate-sulfate composite fertilizer is realized with ammonia, sour neutralization reaction, element sulphur is by being uniformly distributed in composite fertilizer with the form of vitriol, and obtain abundant ammonification, make product contain the required nutritive element of nitrogen phosphate and sulfur three plant growth.
A production method for ammonium phoaphate-sulfate composite fertilizer, described composite fertilizer adopts Traditional Method ammonium phosphate production technique, produces required material and mainly comprises: concentration (P
2o
5) strong phosphoric acid of 40% ~ 48%, highly purified anhydrous liquid ammonia, concentration is the vitriol oil of 90.0% ~ 98.5%; Strong phosphoric acid, liquefied ammonia, the vitriol oil quantitatively enter tubular reactor in proportion according to product specification, neutralization reaction occurs and generates ammonium sulfate, ammonium phosphate mixed slurry, form phosphoric acid ammonium nitrogen-phosphorus-sulphur (NPS) composite fertilizer through drum ammonization and granulation; Described concentration is mass percentage concentration.
Above-mentioned strong phosphoric acid enters ammonium phosphate production system, be divided into two portions, its part enters tail gas generated by granulation pre-scrubber and washs the tail gas that tablets press is overflowed, ammonia and the dust tail gas of effusion are reclaimed in neutralization, the washings part persistent loop washing formed, and be recycled to the anti-complex acid groove of pipe from the exit portion shunting of recycle pump; Another part is applicable to the anti-complex acid of pipe of tubular reactor ammonification according to directly entering the anti-complex acid groove preparation of pipe through metering, the complex acid density of tubular reactor keeps 1.50 ~ 1.60g/ml.
The above-mentioned vitriol oil enters features of DAP production system and is divided into two portions, a part makes an addition to tail gas generated by granulation pre-scrubber together with strong phosphoric acid, tail gas generated by granulation is washed, keep washings in acid, a part does not then enter two tubular reactors, each tubular reactor arranges three opening for feeds, connect sulfuric acid respectively, liquefied ammonia, phosphoric acid pipeline, when tubular reactor runs, phosphoric acid in tubular reactor, sulfuric acid, liquefied ammonia cuts tubular reactor mixing head fast, fully mixed point of ammonia and acid, and there is neutralization reaction rapidly, heat release generates the ammonium phosphate of High Temperature High Pressure rapidly immediately, ammonium sulfate slurry, by means of slip certainly in pressure dynamics, being entered in drum ammonization and granulation tablets press by the guiding of slip distribution pipe is that carrier carries out slurryspraying granulation with returning charge, form ammonium phoaphate-sulfate granule materials, by real-time monitoring and the mensuration of under meter and variable valve, strict control enters two tubular reactor phosphoric acid (P respectively
2o
5), sulfuric acid (H
2sO
4), liquefied ammonia (NH
3) delivery rate, to reach the object controlling product different size and character.
Described two tubular reactor mixing heads are installed on tablets press end, are connected with sulfuric acid, phosphoric acid, liquefied ammonia pipeline, and the slip distribution pipe of tubular reactor extends to tablets press inside.Phosphoric acid, sulfuric acid, liquefied ammonia cut tubular reactor mixing head fast, and mix at mixing head place and neutralization reaction occurs, and generate ammonium sulfate, ammonium phosphate slip, by slip distribution pipe, slip are directed to the whitewashing of tablets press inside.
The ammonium phosphate returning charge that the granulation masterbatch of described tablets press returns from sieving approach system, under the effect of tablets press rotary drum, forms the material curtain of rolling; Ammonification ammonium sulfate, the ammonium phosphate slip of the injection of two tubular reactors are uniformly distributed on masterbatch, slip, masterbatch complete coating, bonded pelleting or from granulating together in tablets press, ammoniation granulator inside is installed the secondary connecting liquefied ammonia house steward and is mended ammonia sparger, a certain proportion of liquefied ammonia can be sprayed in tablets press bed material according to need of production, secondary ammoniation is carried out to granulation material, the propylhomoserin ratio of adjustment granulation material, improve granulation material degree of neutralization, balanced with the nitrogen phosphate and sulfur component proportions adjusting ammonium phoaphate-sulfate compound manure; Dust and the ammonia-containing exhaust of granulating working procedure effusion enter washer, and interpolation strong phosphoric acid and sulfuric acid enter washing, purifying and reclaims; Granulation material nitrogen (N), phosphorus (P
2o
5), the ratio of sulphur (S) arranges propylhomoserin ratio dynamic adjustments according to specification by tubular reactor, with the potential of hydrogen of granulation (pH) for regulating reference frame; Described tablets press is with movable offset plate, and along with the rotation of tablets press, rely on air-breathing and the exhaust process of ventilation breather, the springing of realization activity offset plate, prevents materials from bonding on granulation wall, keeps the loose condition (of surface) of material.
Described tablets press outlet material under gravity, enter rotary dryer, moisture evaporation under from warm air (T=350 ~ 650 DEG C) heat effect of hotblast stove and dry, material starts by the flight in drying machine, form the material curtain of dispersion, add the area of material and warm air, enhance dry effect; The gas ammonia of drying machine product and dust carry out dedusting by blower fan suction cyclonic separator, enter vent gas washing system subsequently, adopt the tail gas containing dust and ammonia that the phosphoric acid washing liquid purification tablets press of lower concentration overflows.
Described material leaves drying machine and enters screening operation, by sieve apparatus, product particle is screened, extracting granularity is that the particle of φ 2 ~ 4mm is as output of products, defective particle φ > 4mm or φ < 2mm then carries out mechanical isolation by screen of screening machine, macrobead is all after crusher in crushing, carried by returning charge handling equipment and return tablets press, as the slip coating granulation again of masterbatch and tubular reactor;
The product (φ 2 ~ 4mm) that particle is qualified enters cooling bed, under gas blower effect, product is suspension fluidization state, adds the contact area of cooling air and material, enhanced products cooling performance, the tail gas of fluidisation cooling system enters dedusting washing procedure, dedusting is carried out to tail gas and purification and emptying, solid phase then as product after the parcel coating of wrapping up finish, increase the protection against the tide of particulate product, dust-proof, agglomeration preventing performance, enter product warehouse storage, packaging is dispatched from the factory.
By the aperture of sieve apparatus material distributing valve; product is regulated to take out ratio; Controlling System material balance is dynamic; keep suitable returning charge ratio; returning charge is than namely returning tablets press material from screening system and taking out the mass ratio of product; normal dimensions is held in 3.5 ~ 6.0:1, to maintain the suitable moisture content of granulation material, presents the graininess of drying, dispersion.
The content of the sulfuric acid, phosphoric acid and the liquefied ammonia that are added by adjustment tablets press, the material of tubular reactor is kept fully to react, and in tablets press, add a certain amount of secondary benefit ammonia, maintain the chemical composition balance of granulation material, finally reach the object regulating product quality specifications and nutrient; In product, sulphur (S) massfraction reaches 3% ~ 15%, and nitrogen (N) massfraction reaches 6.0% ~ 18.0%, phosphorus (P
2o
5) massfraction reaches 20% ~ 40%.
Contriver points out, the present invention is by controlling adding sulfuric acid, phosphoric acid, the proportion adjustment of ammonia and dosing flow rate, realize the material running balance of production system and the Stable distritation of quality product composition, produce the ammonium phosphate of different size sulfur-bearing phosphorus nitrogen, element sulphur is embedded in ammophos comprehensively, form phosphoric acid ammonium nitrogen-phosphorus-sulphur (NPS) composite fertilizer, and not the simple physical of simple nitrogen phosphate and sulfur three kinds of compounds or simple substance mixes, element sulphur exists with the salt form of compound in chemical fertilizer, is a kind of composite fertilizer.Simultaneously, owing to there is a certain amount of foreign ion in phosphoric acid by wet process, in reaction process, also can generate a certain proportion of composite salt, containing the abundant composition such as ammonium nitrogen, soluble phosphate, soluble sulphate in product, can effective guarantee plant production to the demand of nitrogen phosphate and sulfur element, especially rare to nitrogen phosphate and sulfur three kinds of elements area, be conducive to improving soil constituent structure, there is important supplementary function, compensate for the deficiency of natural soil.Therefore, the invention provides expand ammonium phosphate composite fertilizer functional, improve added value of product, be the effective way effectively promoting product diversification.
The present invention has following beneficial effect: the element sulphur in (1) composite fertilizer is present in Composite with the form of vitriol, and solubility is good, be element sulphur by the principal states of his plant absorption, directly can promote the growth of plant, resource utilization is high; (2) contain nitrogen phosphate and sulfur three kinds of main nutrient elements in composite fertilizer, ammonium nitrogen wherein, phosphoric acid salt, vitriol are all soluble in water, directly can be absorbed by plant, promote overall growth and the growth of plant; (3) adopt energy-saving effect significantly and the higher double hose reactor+drum ammonization and granulation technique of level of automation, element sulphur fully embeds in ammonium phosphate granules, Nutrient distribution is even, by controlling the charge proportion of sulfuric acid, phosphoric acid, liquefied ammonia, realize the dynamic adjustments of nitrogen phosphate and sulfur three kinds of element ratios in composite fertilizer, production sulphur content is the composite fertilizer of 3%, 6%, 7%, 10%, 13% plurality of specifications, improves the added value of ammonium phosphate compound manure; (4) sulfuric acid is made an addition in ammonium phosphate production process, not only ensure that element sulphur fully embeds in chemical fertilizer, form Nitrogen, Phosphorus and Potassium, simultaneously, acidic medium is left in process at ammonium phosphate, has sorption to washing tail gas and purification, can improve in granulation, drying process, the rate of recovery of ammonia nitrogen resource, reduces production cost.
Accompanying drawing explanation
Fig. 1 is production technological process of the present invention.
Embodiment
A production method for ammonium phoaphate-sulfate composite fertilizer, described composite fertilizer adopts Traditional Method ammonium phosphate production technique, produces required material and mainly comprises: concentration (P
2o
5) strong phosphoric acid of 40% ~ 48%, highly purified anhydrous liquid ammonia, concentration is the vitriol oil of 90.0% ~ 98.5%; Strong phosphoric acid, liquefied ammonia, the vitriol oil quantitatively enter tubular reactor in proportion according to product specification, neutralization reaction occurs and generates ammonium sulfate, ammonium phosphate mixed slurry, form phosphoric acid ammonium nitrogen-phosphorus-sulphur (NPS) composite fertilizer through drum ammonization and granulation.Major equipment comprises the plurality of devices such as pipe anti-complex acid groove, tubular reactor, drum ammonization and granulation tablets press, drying machine, bucket elevator, sieve apparatus, crusher, cooling bed, parcel cylinder, supports that the preparation of raw material in ammonium phoaphate-sulfate production process, neutralization reaction and granulation, dry materials, conveying, granule sieving and fragmentation, product cool and parcel various functions.
Strong phosphoric acid enters ammonium phosphate production system, be divided into two portions, its part enters tail gas generated by granulation pre-scrubber and washs the tail gas that tablets press is overflowed, ammonia and the dust tail gas of effusion are reclaimed in neutralization, the washings part persistent loop washing formed, is recycled to the anti-complex acid groove of pipe from pump discharge branching part; Another part is applicable to the anti-complex acid of pipe of tubular reactor ammonification according to being recovered to the anti-complex acid groove preparation of pipe through metering shunting, the complex acid density of pipe reaction keeps 1.50 ~ 1.60g/ml.
The vitriol oil enters features of DAP production system and is divided into two portions, a part makes an addition to tail gas generated by granulation pre-scrubber together with strong phosphoric acid, tail gas generated by granulation is washed, what keep washings is acid, be conducive to the recovery of ammonia and the purification of tail gas in tail gas generated by granulation, a part does not directly enter two tubular reactors after then measuring, each tubular reactor arranges three opening for feeds, connect sulfuric acid respectively, liquefied ammonia, phosphoric acid pipeline, when tubular reactor runs, phosphoric acid in tubular reactor, sulfuric acid, liquefied ammonia cuts tubular reactor mixing head fast, ammonia and acid fully mix and rapidly neutralization reaction occur, heat release generates the ammonium phosphate of High Temperature High Pressure rapidly immediately, ammonium sulfate slurry, by means of slip certainly in pressure dynamics, being entered in drum ammonization and granulation tablets press by the guiding of slip distribution pipe is that carrier carries out slurryspraying granulation with returning charge, form ammonium phoaphate-sulfate particle.By real-time monitoring and the mensuration of under meter and variable valve, strictly control to enter two tubular reactor phosphoric acid (P respectively
2o
5), sulfuric acid (H
2sO
4), liquefied ammonia (NH
3) delivery rate, to reach the object controlling product different size and character.
Two tubular reactor mixing heads are installed on tablets press end, are connected with sulfuric acid, phosphoric acid, liquefied ammonia pipeline, and the slip distribution pipe of tubular reactor extends to tablets press inside.Phosphoric acid, sulfuric acid, liquefied ammonia cut tubular reactor mixing head fast, and mix at mixing head place and neutralization reaction occurs, and generate ammonium sulfate, ammonium phosphate slip, by slip distribution pipe, slip are directed to the whitewashing of tablets press inside.
The ammonium phosphate returning charge that granulation masterbatch returns from sieving approach system, under the effect of tablets press rotary drum, forms the material curtain of rolling; The ammonification ammonium sulfate of the injection of two tubular reactors, ammonium phosphate slip are uniformly distributed with on masterbatch; slip, masterbatch complete coating, bonded pelleting or from granulating together in tablets press; ammoniation granulator inside is installed the secondary connecting liquefied ammonia house steward and is mended ammonia sparger; a certain proportion of liquefied ammonia can be sprayed in tablets press bed material according to need of production; secondary ammoniation is carried out to granulation material; the propylhomoserin ratio of adjustment granulation material; improve granulation material degree of neutralization, balanced with the nitrogen phosphate and sulfur component proportions adjusting ammonium phoaphate-sulfate compound manure.Dust and the ammonia-containing exhaust of granulating working procedure effusion enter washer, and interpolation strong phosphoric acid and sulfuric acid enter washing, purifying.Granulation material nitrogen (N), phosphorus (P
2o
5), the ratio of sulphur (S) arranges propylhomoserin ratio dynamic adjustments according to product specification by tubular reactor, with the potential of hydrogen of granulation (pH) for regulating reference frame.Rotary drum granulator is with movable offset plate, and along with the transhipment of tablets press, rely on air-breathing and the exhaust process of ventilation breather, the springing of realization activity offset plate, prevents materials from bonding on granulation wall, keeps the loose condition (of surface) of material.
Tablets press outlet material under gravity; enter rotary dryer; moisture evaporation under from warm air (T=350 ~ 650 DEG C) heat effect of hotblast stove and dry; material starts by the flight in drying machine; form the material curtain of dispersion; add the area of material and warm air, enhance dry effect.The gas ammonia of drying machine product and dust carry out dedusting by blower fan suction cyclonic separator, enter vent gas washing system subsequently, adopt the tail gas containing dust and ammonia that the phosphoric acid washing liquid purification tablets press of lower concentration overflows.
The material leaving drying machine enters screening operation; by sieve apparatus, product particle is screened; extracting granularity is that the particle of φ 2 ~ 4mm is as output of products; defective particle φ > 4mm or φ < 2mm person then carry out mechanical isolation by screen of screening machine; macrobead is all after crusher in crushing; carried by returning charge handling equipment and return tablets press, as the slip coating granulation again of masterbatch and tubular reactor.
The product (φ 2 ~ 4mm) that particle is qualified enters cooling bed, under gas blower effect, product is suspension fluidization state, adds the contact area of cooling air and material, enhanced products cooling performance, the tail gas of fluidisation cooling system enters dedusting washing procedure, dedusting is carried out to tail gas and purification and emptying, solid phase then as product after the parcel coating of wrapping up finish, increase the protection against the tide of particulate product, dust-proof, agglomeration preventing performance, enter product warehouse storage, packaging is dispatched from the factory.
By the aperture of screening system material distributing valve; product is regulated to take out ratio; Controlling System material balance is dynamic; keep suitable returning charge ratio; returning charge is than namely returning tablets press material from screening system and taking out the mass ratio of product; normal dimensions is held in 3.5 ~ 6.0:1, to maintain the graininess presenting drying, dispersion of granulation material.
In addition; the content of the sulfuric acid, phosphoric acid and the liquefied ammonia that are added by adjustment tablets press, keeps the material of tubular reactor fully to react, and in tablets press, add a certain amount of secondary benefit ammonia; maintain the chemical composition balance of granulation material, finally reach the object regulating product quality specifications and nutrient.In product, sulphur (S) massfraction reaches 3% ~ 15%, and nitrogen (N) massfraction reaches 6.0% ~ 18.0%, phosphorus (P
2o
5) massfraction reaches 20% ~ 40%.Common product nutrient specification comprises 14(N)-32(P
2o
5)-7(S), 16(N)-20(P
2o
5)-13(S), 16(N)-42(P
2o
5)-3(S) and etc. plurality of specifications.
The above washings, manage add in anti-complex acid, slip sulfuric acid, phosphoric acid ratio, quantitatively add in proportion according to produced product specification and chemical composition balance, to keep stable parameter, have good fluidity, the addition of material effectively maintains material balance and the heat balance of system.
In above-mentioned production process; exhaust scrubber is set for granulation process purification and washing is carried out to the dust-containing tail gas that tablets press is overflowed; also the tail gas for drying machine, handling equipment, cooling bed arranges fly-ash separator and washing tower; tail gas is purified; reclaim the resource such as phosphorus, nitrogen wherein; guarantee the qualified discharge of tail gas, reduce unit product consumption simultaneously, improve utilization of resources rate.
Following instance is for illustration of implementation process of the present invention and effect:
embodiment: N:p
2o
5 : S=14:32:7 compound fertilizer technology
In this series products, total nitrogen (N) content>=14.0%, available phosphorus (P
2o
5) content>=32.0%, sulphur (S) content>=7.0%.
With 1 ton of product for metering, containing nitrogen (N) 140kg, Vanadium Pentoxide in FLAKES (P in ammonium phoaphate-sulfate product per ton
2o
5) 320kg, sulphur (S) 70kg, then purity 99.6%(is with NH
3meter) liquefied ammonia, concentration 47%(is with P
2o
5meter) phosphoric acid, concentration 98%(is with H
2sO
4meter) vitriol oil is raw material, resource yield 98% calculates, then ammonium phoaphate-sulfate unit consumption of product liquefied ammonia (NH per ton
3) 174.17kg, strong phosphoric acid (47%P
2o
5) 958.75kg, the vitriol oil (98%H
2sO
4) 223.21kg.
Load, in proportion charging is produced according to system in production process.The mass rate of strong phosphoric acid, the vitriol oil, liquefied ammonia three bursts of streams, strictly controls to enter production reactive system according to product specification in proportion, to maintain the chemical Equilibrium Analysis of product nitrogen phosphate and sulfur three kinds of elements and the stable of nutrients ratio.
First add the vitriol oil, strong phosphoric acid and process water to washing system, maintenance density is 1.25 ~ 1.45g/ml, has good mobility, is conducive to recovery and the purification of ammonia and dust in tail gas in fluid conveying and granulation pre-wash system.
Add from strong phosphoric acid in the anti-complex acid groove of pipe, and retrieve the washings from tail gas generated by granulation washing system, preparation is applicable to tubular reactor aminating reaction phosphoric acid, and the density of managing anti-complex acid keeps 1.50 ~ 1.60g/ml.
The anti-complex acid of the pipe prepared delivers into tubular reactor mixing head by managing anti-feeding pump, cut tubular reactor mixing head from the high-pressure liquid ammonia of liquefied ammonia tank field and the vitriol oil of sulfuric acid tank field simultaneously simultaneously, neutralization reaction is there is rapidly at tubular reactor, generate ammonium sulfate slurry and the ammonium phosphate slip of High Temperature High Pressure, by means of the heat of propylhomoserin neutralization reaction release, slurry temperature is increased to 125 ~ 155 DEG C, pressure reaches 0.20 ~ 0.60MPa, slip is guided by tubular reactor slip distribution pipe and is entered tablets press rotating cylinder inside, in returning charge (masterbatch), pressure injection with self expects that bed is with on material curtain, complete coating, bonding, from granulation process such as granulating, simultaneously, by observing the Particles Distribution of tablets press outlet material, ammonia/sour the ratio of dynamic adjustments tubular reactor inlet amount and adjustment tubular reactor, the NH of tubular reactor
3/ H
3pO
4mol ratio controls between 1.00 ~ 1.35, and at a certain amount of liquefied ammonia of material bed deep spray of tablets press, secondary ammoniation is carried out to granulation material, lasting aminating reaction, may, by more dry for maintenance tablets press outlet material, harder, tablets press outlet material pH value be kept to be between 6.5 ~ 7.5.
By controlling the addition of phosphoric acid, sulfuric acid, liquefied ammonia, with phosphoric acid flow for variable, by regulating the flow of sulfuric acid, liquefied ammonia, keeping the ratio of mass flow, controlling product quality specifications and parameter.Product Chemical Composition balance is kept to be nitrogen: phosphorus: sulphur=14:32:7 material proportion is as shown in following table-1:
Table-1:14-32-7 composite fertilizer charge ratio table
By parameters such as regulating feeding proportion granulation, drying temperatures, obtain ammonium phoaphate-sulfate composite finished product, the mass parameter of its product is as shown in table-2:
Table-2:14-32-7 ammonium phoaphate-sulfate quality analysis results
Claims (9)
1. a production method for ammonium phoaphate-sulfate composite fertilizer, is characterized in that described composite fertilizer adopts Traditional Method ammonium phosphate production technique, produces required material and mainly comprises: P
2o
5the strong phosphoric acid of concentration 40% ~ 48%, highly purified anhydrous liquid ammonia, concentration is the vitriol oil of 90.0% ~ 98.5%; Strong phosphoric acid, liquefied ammonia, the vitriol oil quantitatively enter tubular reactor in proportion according to product specification, neutralization reaction occurs and generates ammonium sulfate, ammonium phosphate mixed slurry, form phosphoric acid ammonium nitrogen-phosphorus-sulphur (NPS) composite fertilizer through drum ammonization and granulation; Described concentration is mass percentage concentration.
2. the production method of ammonium phoaphate-sulfate composite fertilizer as claimed in claim 1, it is characterized in that described strong phosphoric acid enters ammonium phosphate production system, be divided into two portions, its part enters tail gas generated by granulation pre-scrubber and washs the tail gas that tablets press is overflowed, ammonia and the dust tail gas of effusion are reclaimed in neutralization, the washings part persistent loop washing formed, is recycled to the anti-complex acid groove of pipe from circulating-pump outlet branching part; Another part measures shunting as required and directly enters into the anti-complex acid of pipe that the anti-complex acid groove preparation of pipe is applicable to tubular reactor ammonification, and the complex acid density of pipe reaction keeps 1.50 ~ 1.60g/ml.
3. the production method of ammonium phoaphate-sulfate composite fertilizer as claimed in claim 2, it is characterized in that the described vitriol oil enters features of DAP production system and is divided into two portions, a part makes an addition to tail gas generated by granulation pre-scrubber together with strong phosphoric acid, tail gas generated by granulation is washed, keep washings in acid, a part does not then enter two tubular reactors, each tubular reactor arranges three opening for feeds, connect sulfuric acid respectively, liquefied ammonia, phosphoric acid pipeline, when tubular reactor runs, phosphoric acid in tubular reactor, sulfuric acid, liquefied ammonia cuts tubular reactor mixing head fast, also there is neutralization reaction rapidly in fully mixed point of ammonia and acid, heat release generates the ammonium phosphate of High Temperature High Pressure rapidly immediately, ammonium sulfate slurry, by means of slip certainly in pressure dynamics, being entered in drum ammonization and granulation tablets press by the guiding of slip distribution pipe is that carrier carries out slurryspraying granulation with returning charge, form particulate state ammonium phoaphate-sulfate granule materials, by real-time monitoring and the mensuration of under meter and variable valve, strict control enters two tubular reactor phosphoric acid (P respectively
2o
5), sulfuric acid (H
2sO
4), liquefied ammonia (NH
3) delivery rate, to reach the object controlling product different size and character.
4. the production method of ammonium phoaphate-sulfate composite fertilizer as claimed in claim 3, it is characterized in that described two tubular reactor mixing heads are installed on tablets press end, be connected with sulfuric acid, phosphoric acid, liquefied ammonia pipeline, the slip distribution pipe of tubular reactor extends to tablets press inside; Phosphoric acid, sulfuric acid, liquefied ammonia cut tubular reactor mixing head fast, and mix at mixing head place and neutralization reaction occurs, and generate ammonium sulfate, ammonium phosphate slip, by slip distribution pipe, slip are directed to the whitewashing of tablets press inside.
5. the production method of ammonium phoaphate-sulfate composite fertilizer as claimed in claim 4, is characterized in that the ammonium phosphate returning charge that the granulation masterbatch of described tablets press returns from sieving approach system, under the effect of tablets press rotary drum, forms the material curtain of rolling; Ammonification ammonium sulfate, the ammonium phosphate slip of the injection of two tubular reactors are uniformly distributed on masterbatch, slip, masterbatch complete coating, bonded pelleting or from granulating together in tablets press, ammoniation granulator inside is installed the secondary connecting liquefied ammonia house steward and is mended ammonia sparger, a certain proportion of liquefied ammonia can be sprayed in tablets press bed material according to need of production, secondary ammoniation is carried out to granulation material, the propylhomoserin ratio of adjustment granulation material, improve granulation material degree of neutralization, balanced with the nitrogen phosphate and sulfur component proportions adjusting ammonium phoaphate-sulfate compound manure; Dust and the ammonia-containing exhaust of granulating working procedure effusion enter washer, and interpolation strong phosphoric acid and sulfuric acid enter washing, purifying; Granulation material nitrogen (N), phosphorus (P
2o
5), the ratio of sulphur arranges propylhomoserin ratio dynamic adjustments according to specification by tubular reactor, with the potential of hydrogen of granulation (pH) for regulating reference frame; Described tablets press is with movable offset plate, and along with the transhipment of tablets press, rely on air-breathing and the exhaust process of ventilation breather, the springing of realization activity offset plate, prevents materials from bonding on granulation wall, keeps the loose condition (of surface) of material.
6. the production method of ammonium phoaphate-sulfate composite fertilizer as claimed in claim 5, it is characterized in that described tablets press outlet material under gravity, enter rotary dryer, moisture evaporation under from the warm air beating effect of hotblast stove and dry, described hot air temperature T=350 ~ 650 DEG C, material starts by the flight in drying machine, forms the material curtain of dispersion, add the area of material and warm air, enhance dry effect; The gas ammonia of drying machine product and dust drop into cyclonic separator by blower fan and carry out dedusting, enter vent gas washing system subsequently, adopt the tail gas containing dust and ammonia that the phosphoric acid washing liquid purification tablets press of lower concentration overflows.
7. the production method of ammonium phoaphate-sulfate composite fertilizer as claimed in claim 6, it is characterized in that described material leaves drying machine and enters screening operation, by sieve apparatus, product particle is screened, extracting granularity is that the particle of φ 2 ~ 4mm is as output of products, defective particle φ > 4mm or φ < 2mm then carries out mechanical isolation by screen of screening machine, macrobead is all after crusher in crushing, carried by returning charge handling equipment and return tablets press, as the slip coating granulation again of masterbatch and tubular reactor;
Product φ 2 ~ 4mm that particle is qualified, enter cooling bed, under gas blower effect, product is suspension fluidization state, add the contact area of cooling air and material, enhanced products cooling performance, the tail gas of fluidisation cooling system enters dedusting washing procedure, to tail gas carry out dedusting and purification and emptying, solid phase then as product through parcel finish parcel coating after, increase the protection against the tide of particulate product, dust-proof, agglomeration preventing performance, enter product warehouse storage, packaging is dispatched from the factory.
8. the production method of ammonium phoaphate-sulfate composite fertilizer as claimed in claim 7; it is characterized in that the aperture by sieve apparatus material distributing valve; product is regulated to take out ratio; Controlling System material balance is dynamic; keep suitable returning charge ratio; namely returning charge than returning tablets press material from screening system and taking out the mass ratio of product, and normal dimensions is held in 3.5 ~ 6.0:1, to maintain the graininess presenting drying, dispersion of granulation material.
9. the production method of the ammonium phoaphate-sulfate composite fertilizer as described in any one of claim 1-8, it is characterized in that the content of the sulfuric acid by regulating tablets press to add, phosphoric acid and liquefied ammonia, the material of tubular reactor is kept fully to react, and in tablets press, add a certain amount of secondary benefit ammonia, maintain the chemical composition balance of granulation material, finally reach the object regulating product quality specifications and nutrient; In product, sulphur (S) massfraction reaches 3% ~ 15%, and nitrogen (N) massfraction reaches 6.0% ~ 18.0%, phosphorus (P
2o
5) massfraction reaches 20% ~ 40%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410571433.2A CN104355734A (en) | 2014-10-24 | 2014-10-24 | Production method of ammonium sulfate-ammonium phosphate composite fertilizer |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106380255A (en) * | 2016-08-31 | 2017-02-08 | 瓮福达州化工有限责任公司 | Sulfur-containing diammonium phosphate production process and production device |
| CN108484246A (en) * | 2018-05-29 | 2018-09-04 | 云南祥丰金麦化工有限公司 | A kind of prilling process producing chemical fertilizer |
| CN108658674A (en) * | 2018-07-05 | 2018-10-16 | 云南云天化股份有限公司 | A method of utilizing discarded molten sulphur filter residue production elemental sulfur composite fertilizer |
| CN110483126A (en) * | 2019-09-20 | 2019-11-22 | 瓮福达州化工有限责任公司 | A kind of multielement compound phosphatic fertilizer and preparation method thereof |
| CN110590479A (en) * | 2019-09-20 | 2019-12-20 | 瓮福达州化工有限责任公司 | Composite phosphate fertilizer containing magnesium and zinc elements and preparation method thereof |
| CN110723999A (en) * | 2019-11-20 | 2020-01-24 | 瓮福（集团）有限责任公司 | Equipment and method suitable for improving water solubility of trace elements in trace element ammonium phosphate product |
| CN110818475A (en) * | 2019-12-13 | 2020-02-21 | 太原柏悟化工科技有限公司 | Production method and production device of ammonium nitrate-sulfur compound fertilizer |
| CN111943784A (en) * | 2020-09-17 | 2020-11-17 | 嘉施利（宜城）化肥有限公司 | Compound fertilizer production method |
| CN112430147A (en) * | 2020-11-24 | 2021-03-02 | 湖北三宁化工股份有限公司 | Method for producing ammonium phosphate sulfate by using diammonium phosphate device by using ammonia-acid method |
| CN114560744A (en) * | 2022-03-14 | 2022-05-31 | 云南云天化股份有限公司 | Method for preparing polymorphic phosphorus compound fertilizer |
| CN114804974A (en) * | 2022-03-04 | 2022-07-29 | 宜昌东圣磷复肥有限责任公司 | Production method of novel diammonium humate |
| CN115160051A (en) * | 2022-08-30 | 2022-10-11 | 河南晋开化工投资控股集团有限责任公司 | Double ammoniation granulation process for urea-based compound fertilizer |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106380255A (en) * | 2016-08-31 | 2017-02-08 | 瓮福达州化工有限责任公司 | Sulfur-containing diammonium phosphate production process and production device |
| CN108484246A (en) * | 2018-05-29 | 2018-09-04 | 云南祥丰金麦化工有限公司 | A kind of prilling process producing chemical fertilizer |
| CN108658674A (en) * | 2018-07-05 | 2018-10-16 | 云南云天化股份有限公司 | A method of utilizing discarded molten sulphur filter residue production elemental sulfur composite fertilizer |
| CN110483126A (en) * | 2019-09-20 | 2019-11-22 | 瓮福达州化工有限责任公司 | A kind of multielement compound phosphatic fertilizer and preparation method thereof |
| CN110590479A (en) * | 2019-09-20 | 2019-12-20 | 瓮福达州化工有限责任公司 | Composite phosphate fertilizer containing magnesium and zinc elements and preparation method thereof |
| CN110723999B (en) * | 2019-11-20 | 2024-04-23 | 瓮福（集团）有限责任公司 | Equipment and method suitable for improving water solubility of trace elements in trace element ammonium phosphate product |
| CN110723999A (en) * | 2019-11-20 | 2020-01-24 | 瓮福（集团）有限责任公司 | Equipment and method suitable for improving water solubility of trace elements in trace element ammonium phosphate product |
| CN110818475A (en) * | 2019-12-13 | 2020-02-21 | 太原柏悟化工科技有限公司 | Production method and production device of ammonium nitrate-sulfur compound fertilizer |
| CN111943784A (en) * | 2020-09-17 | 2020-11-17 | 嘉施利（宜城）化肥有限公司 | Compound fertilizer production method |
| CN112430147A (en) * | 2020-11-24 | 2021-03-02 | 湖北三宁化工股份有限公司 | Method for producing ammonium phosphate sulfate by using diammonium phosphate device by using ammonia-acid method |
| CN114804974A (en) * | 2022-03-04 | 2022-07-29 | 宜昌东圣磷复肥有限责任公司 | Production method of novel diammonium humate |
| CN114560744A (en) * | 2022-03-14 | 2022-05-31 | 云南云天化股份有限公司 | Method for preparing polymorphic phosphorus compound fertilizer |
| CN114560744B (en) * | 2022-03-14 | 2023-12-05 | 云南云天化股份有限公司 | Method for preparing multi-form phosphorus compound fertilizer |
| CN115160051A (en) * | 2022-08-30 | 2022-10-11 | 河南晋开化工投资控股集团有限责任公司 | Double ammoniation granulation process for urea-based compound fertilizer |
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