CN108440056A - Composite fertilizer generates system - Google Patents
Composite fertilizer generates system Download PDFInfo
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- CN108440056A CN108440056A CN201810360752.7A CN201810360752A CN108440056A CN 108440056 A CN108440056 A CN 108440056A CN 201810360752 A CN201810360752 A CN 201810360752A CN 108440056 A CN108440056 A CN 108440056A
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- ammonia
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- roller
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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
- C05G1/00—Mixtures of fertilisers belonging individually to different subclasses of C05
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- Life Sciences & Earth Sciences (AREA)
- Pest Control & Pesticides (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Fertilizers (AREA)
Abstract
The invention discloses a kind of composite fertilizers to generate system, solves the problems such as particle in existing composite heat transfer granulation process is uneven, moisture is high, intensity is low, returning charge is more.Technical solution includes sequentially connected pretreatment system, granulating system, after-treatment system and charging and revert system, the granulating system includes the roller equipped with driving device, the roller rear end connects discharging structure, feed pipe, nitration mixture pipe, tubular reactor and spray ammonia pipe tube bank are from top to bottom equipped in the leading portion of the roller successively, the nitration mixture pipe, tubular reactor and spray ammonia pipe tube bank are equipped with nozzle；The feed pipe is connect with charging and revert system, and the tubular reactor is connect with ammonia station, pretreatment system and sulfuric acid storage tank respectively；The nitration mixture pipe is connect with exhaust treatment system and sulfuric acid storage tank respectively；The spray ammonia pipe tube bank is connect with ammonia station.Present system is simple, energy consumption saving wheel drop product strength is high, anti-material rate is low, production efficiency is high, good water solubility, environmentally friendly.
Description
Technical field
The invention belongs to composite heat transfer technical field, more particularly to a kind of composite fertilizer using half slurry processes of double ammonia generates system
System.
Background technology
The production of composite fertilizer include be granulated, be dry, is cooling, screening, the processes such as coating and pack, in granulation, drying and cold
But tail gas is will produce during, therefore composite heat transfer system generally includes granulating system, after-treatment system, vent gas treatment system
System and charging and revert system, treatment and finishing section include the processes such as drying, cooling, screening, coating and pack, vent gas treatment workshop section
For vent gas treatment, charging and returning charge workshop section are for charging and returning charge.Wherein, be granulated can be used roller pelletizer to sulfuric acid, ammonia,
Potash fertilizer, phosphate fertilizer etc. are granulated.
Roller pelletizer is a kind of forming machine that material can be manufactured into specific shape.Roller pelletizer is composite fertilizer's row
One of key equipment of industry, suitable for hot and cold granulation and it is high, low concentration compound fertilizer large-scale production.Groundwork side
Formula is granule wet granulation makes base fertilizer fully be chemically reacted after damping in cylinder by a certain amount of water or steam,
Under certain liquid-phase condition, by the rotary motion of cylinder, make to generate extruding force reunion balling-up between material particle.
Existing roller granulation device generally includes rotatable cylinder, the feed inlet of cylinder one end, the cylinder other end
Discharging structure, be passed through the ammonia pipe of cylinder and be passed through the acid tube etc. of cylinder, by feed pipe be added potash fertilizer, phosphate fertilizer, urea and
The raw materials such as bonding agent are passed through ammonia by ammonia pipe, and sulfuric acid is added by acid tube, and steam is added additionally by steam pipe.
Such as application No. is 201610789360.3 patents to disclose a kind of roller pelletizer, including body, the body
Internal installation settings has mixing tube, the mixing tube to be interspersed in the body, and one end of the mixing tube is provided with mixer,
The other end is inserted into a bed material, and ammonia pipe and vapor pipe, the mixing tube lower end setting are provided on the mixer
There are sulfuric acid pipe, the exit of the sulfuric acid pipe to be provided with nozzle.
When generating system for existing composite fertilizer using above-mentioned roller pelletizer, inventor asks as follows it has been found that existing
Topic：
(1) acid needs to shift to an earlier date nitration mixture in nitration mixture slot before being sent into comminutor, will produce a large amount of heat, troublesome in poeration, also deposits
In security risk；
(2) moisture causes follow-up drying pressure big still greater than 5%, and final products easily lump, and particle is uneven, product
Intensity is low (being usually 20-25N), and returning charge is higher, and for returning charge rate up to 20-25%, production efficiency is relatively low；
(3) due to moisture content of material height, it usually needs additional bonding agent (such as clay) is added to ensure granulating rate, no
But cost is higher, also reduces the water-soluble of product；
(4) vent gas treatment workshop section will produce a large amount of washing lotions, can not utilize；
(5) reaction process is more difficult to control, causes each lot number product difference larger.
Invention content
The purpose of the present invention is to solve above-mentioned technical problem, a kind of simple system, energy consumption saving wheel drop, reaction process are provided
It is easily controllable, product strength is high, anti-material rate is low, production efficiency is high, good water solubility, environment amenable composite fertilizer generate system.
Technical solution includes sequentially connected pretreatment system, granulating system, after-treatment system and charging and revert system,
The granulating system and after-treatment system are also connected with exhaust treatment system, and the granulating system includes the rolling equipped with driving device
Cylinder, the roller rear end connect discharging structure, feed pipe, nitration mixture pipe, pipe are from top to bottom equipped with successively in the leading portion of the roller
Formula reactor and spray ammonia pipe tube bank, the nitration mixture pipe, tubular reactor and spray ammonia pipe tube bank are equipped with nozzle；The feed pipe with
Charging and revert system connection, the tubular reactor connect through the first ammonia import with ammonia station respectively, through phosphor ammonium slurry import and
Pretreatment system connects, and is connect with sulfuric acid storage tank through the first sour import；The nitration mixture pipe is respectively through washing lotion import and vent gas treatment
System connects, and is connect with sulfuric acid storage tank through the second sour import；The spray ammonia pipe tube bank is connect through the second ammonia import with ammonia station.
The pretreatment system includes connection pretreatment tank and regulating tank；Steam pipe network is separately connected pretreatment tank, adjusts
The steam inlet of slot and spray ammonia pipe tube bank；The washing lotion import of the pretreatment tank is also connect with exhaust treatment system.
The rear end of the tubular reactor sets the batch mixing nozzle towards roller axial direction, the rear end of the nitration mixture pipe set towards to
Under nitration mixture nozzle, the nitration mixture nozzle is located at the rear of the batch mixing nozzle.
The level interval 10-15cm of the nitration mixture nozzle and batch mixing nozzle, vertical interval 4-8.5cm.
The spray ammonia pipe tube bank is equipped with multiple downward ammonia nozzles, the batch mixing of the tubular reactor axially back and forth along roller
Top of the nozzle between most latter two ammonia nozzle, feed pipe is located above most previous ammonia nozzle or front.
The ammonia nozzle is 24-28cm at a distance from cylinder bottom inner wall, most previous ammonia nozzle and drum front end away from
From for 60-70cm, the distance between adjacent ammonia nozzle is 36-44cm.
The problem of for background technology, inventor have made following improvement：
1) half slurry processes technique of double ammonia refer to main material phosphorus ammonium be slurried, ammonification technique twice, be based on this, inventor is in roller
Feed pipe, nitration mixture pipe, tubular reactor and spray ammonia pipe tube bank are from top to bottom set gradually, feed pipe is arranged to be made in the top
Slurry after returning charge can react it with propylhomoserin in dropping process is fully wrapped in small of the phosphorus ammonium sprayed by reactor
On grain, to realize granulating uniformly and high intensity purpose；The nitration mixture pipe, which synchronizes, is passed through sulfuric acid and from exhaust treatment system
Washing lotion, sprayed into roller using after the direct dilute sulphuric acid of washing lotion, while eliminating nitration mixture slot, the reaction heat of nitration mixture can be via
Nitration mixture pipe is directly conducted into roller, and thermal energy is provided to be granulated, while being avoided outer hidden with the sulfuric acid produced pollution and safety
Suffer from；Creative setting tubular reactor synchronizes and is passed through the ammonia from ammonia station, the phosphor ammonium slurry from phosphorus ammonium pretreatment tank and comes
From the sulfuric acid of sulfuric acid storage tank, three forms finely ground particles in tubular reactor inner edge mixing side reaction (propylhomoserin reaction) and sprays into rolling
In cylinder；The spray ammonia pipe tube bank introduces the mixture of steam and ammonia, and thermal energy and moisture are provided to be granulated while heating ammonia, due to
Arrangement relationship above and below nitration mixture pipe, tubular reactor and spray ammonia pipe tube bank so that the finely ground particles that tubular reactor sprays exist
The dilute sulfuric acid sprayed by top nitration mixture pipe when not falling also and lower section spray ammonia pipe tube bank spray the package again for rising mixture
Continue to be granulated reaction and form core, finally falls into cylinder bottom and slurry again and further wrap up granulation, such successive reaction, layer by layer
The product particle uniform particle sizes that are wrapped to form, intensity is small and content water is low.
2) phosphor ammonium slurry first preprocessed system processing before entering tubular reactor：Phosphorus ammonium pretreatment tank is added in phosphorus ammonium,
And be introduced into the washing lotion in exhaust treatment system into slot and dissolve phosphorus ammonium under steam heating, then further adjusted in regulating tank again
Temperature, viscosity and the density of phosphor ammonium slurry make it meet the condition for entering tubular reactor reaction, to reach useless using washing lotion
Water reduces water consume, improves reaction efficiency and the flexibly purpose of control reaction process.
3) in order to further increase the effect of granulation, inventor further designs the direction of each nozzle, design
Downward for nitration mixture nozzle and ammonia nozzle, batch mixing nozzle is axial towards roller.Although the ammonia that the ammonia nozzle towards downward, sprays
It is gaseous state with vapour mixture, other than in the material that part enters cylinder bottom, also part can be upward, in this way, three sprays
The three strands of materials that head sprays can along it is upper and lower, in three directions cross in the middle part of roller, extend the skyborne stop of finely ground particles
Time makes it that propylhomoserin reaction constantly occur in slow dropping process and is wrapped up in its surface layer, the product particle object of formation
Grain size more uniformly, intensity higher, water content it is lower.Further, it is contemplated that the material that batch mixing nozzle sprays, the nitration mixture spray
Head enables the finely ground particles of the mixed head ejection of batch mixing within first time and dilutes sulphur in this way positioned at the rear of the batch mixing nozzle
Sour haptoreaction makes full use of the reaction heat of dilute sulphuric acid, further decreases water and contains.
4) further, the spray ammonia pipe tube bank is equipped with multiple downward ammonia nozzles, the tubular type axially back and forth along roller
Top of the batch mixing nozzle of reactor between most latter two ammonia nozzle, is fully gasified ammonia using reaction heat with reaching,
And form the purpose that big air-flow takes away moisture.
5) further, consider granulating effect and moisture, the ammonia nozzle is at a distance from cylinder bottom inner wall
Preferably 24-28cm；Most previous ammonia nozzle is preferably 60-70cm at a distance from drum front end；Between adjacent ammonia nozzle away from
From preferably 36-44cm.
To sum up, using present system so that reaction process is easily controllable in composite fertilizer's preparation process, production efficiency is high (raw
15-25% can be improved in production capacity power), product particle epigranular, granulating rate is high, and system returning charge is low, and (returning charge rate can reduce 5-
10%), intensity good (up to 30N or so), without adding clay, product good water solubility, water content low (3% or less), low energy consumption,
Environmentally friendly, utilization rate height of ammonia, adaptability is good, can produce the institutes such as high nitrogen, high phosphorus, high potassium, chloro, sulfenyl, nitre sulfenyl
There is the complex fertilizer product of formula.
Description of the drawings
Fig. 1 is present system figure.
Fig. 2 is the structure chart of granulating system of the present invention.
Fig. 3 position relationship schematic diagrams between each nozzle in the roller of partial enlargement.
Wherein, A pretreatment systems, A1 pretreatment tanks, A2 regulating tanks, A3 steam pipe networks, B granulating systems, B1 sulfuric acid storage tanks,
B2 ammonia station, C after-treatment systems, D charging and revert system, E exhaust treatment systems, 1 roller, 2 discharging structures, 3 tubular reactors,
3.1- batch mixings nozzle, 4 acid mixing devices, 4.1 nitration mixture nozzles, 5 spray ammonia pipe tube banks, 6 feed pipes, 7 first ammonia imports, 8 phosphor ammonium slurries into
Mouth, 9 first sour imports, 10 washing lotion imports, 11 second sour imports, 12 ammonia nozzles, 13 ammonia distributors, 14 discharge ports, 15 tail gas go out
Mouth, 16 second ammonia imports, 17 steam inlets.
Specific implementation mode
Explanation is further explained to the present invention below in conjunction with the accompanying drawings：
Referring to Fig. 1, an embodiment of the present invention provides a kind of composite fertilizers to generate system, which includes pretreatment system A, makes
Grain system B, treatment and finishing section C, charging and revert system D and exhaust treatment system E, wherein pretreatment system A, granulating system
B, after-treatment system C and charging and revert system D adjunctions successively, the granulating system B and after-treatment system C are also connected at tail gas
The tail gas of generation is uniformly sent into exhaust treatment system E processing by reason system E.
Each equipment connecting relation in the treatment and finishing section C, charging and revert system D and exhaust treatment system E and work
Skill flow can also be rationally designed, be not described in detail here compared with technology, those skilled in the art according to actual needs.In each system
Material disengaging can be arranged as required to measuring equipment and filter plant, this is the prior art.
The pretreatment system A includes the pretreatment tank A1 of connection and regulating tank A2, specific pretreatment tank A1 are underground
Slot, regulating tank A2 are ground slot, and the pretreatment tank A1 connects steam pipe network A3 with the steam(-)coil of regulating tank A2, by steaming
Institute pipe network A3 provides thermal energy for pretreatment tank A1 and regulating tank A2, when necessary, can also pass through condensed water confession hot water；The pre- place
Manage the wash liquor inlet connection exhaust treatment system E of slot A1.
Referring to Fig. 1 and Fig. 2, the granulating system B includes that the roller 1 equipped with driving device (is come with material operation in roller 1
See, before feed end is, discharge end is rear), the roller 1 is front and back to being obliquely installed (5-20 °), and rear end connects discharging structure 2, institute
It states 2 top of discharging structure and sets offgas outlet 15, bottom sets out material mouth 14；It is from top to bottom equipped with successively in the leading portion of the roller 1
Feed pipe 6, nitration mixture pipe 4, tubular reactor 3 and spray ammonia pipe tube bank 5；The feed pipe 6 is connect with charging and revert system D, is used
In addition returning charge and raw material is added；4 rear end of nitration mixture pipe is inserted into roller 1, leading portion respectively through washing lotion import 10 and tail gas at
The E connections of reason system are connect through the second sour import 11 with sulfuric acid storage tank B1；3 rear end of the tubular reactor is inserted into roller 1, preceding
Section is connect through the first ammonia import 7 with ammonia station B2 respectively, is connect with the regulating tank A2 of pretreatment system A through phosphor ammonium slurry import 8, is passed through
First sour import 9 is connect with sulfuric acid storage tank B1；The spray ammonia pipe is restrained 5 leading portions and is inserted into roller 1, and back segment divides through ammonia distributor 13
The second ammonia import 16 and steam inlet 17 are not connected, and the second ammonia import 16 is connect with ammonia station B1, and the connection of steam inlet 17 is steamed
Steam pipe net A3.
Referring to Fig. 2, the rear end of the tubular reactor 3 sets the batch mixing nozzle 3.1 towards roller axial direction, the nitration mixture pipe 4
Rear end set towards downward nitration mixture nozzle 4.1, the nitration mixture nozzle 4.1 is located at the rear of the batch mixing nozzle 3.1, preferably
, the level interval h1 of the nitration mixture nozzle 4.1 and batch mixing nozzle 3.1 is 10-15cm, and vertical interval h2 is 4-8.5cm.
Referring to Fig. 2, the spray ammonia pipe tube bank 5 is filled the span of a man's arms by more ammonia pipes, is equipped with axially back and forth along roller 1 multiple downward
Ammonia nozzle 12, the top of the batch mixing nozzle 3.1 of the tubular reactor 3 between most latter two ammonia nozzle 12, feed pipe 6
Above most previous ammonia nozzle 12 or front, it is preferred that the ammonia nozzle 12 is with 1 bottom interior wall distance h3 of roller
24-28cm, most previous ammonia nozzle 12 are 60-70cm, the distance between adjacent ammonia nozzle 12 h5 with 1 front end distance h4 of roller
For 36-44cm.
Technical process：
Addition phosphorus ammonium and the washing lotion Hybrid Heating from exhaust treatment system E are sent into after dissolving and are adjusted in pretreatment tank A1
The parameters such as the temperature, viscosity and density of phosphor ammonium slurry are further adjusted in slot A2 with ensure its in subsequent reactor it is good anti-
It answers, then is sent into tubular reactor 3 through phosphor ammonium slurry import 8, meanwhile, the sulfuric acid in sulfuric acid storage tank B1 is through in pipe reaction 3
Sulfuric acid is sent into through the first sour import 9, and the ammonia in the B2 of ammonia station is sent by the first ammonia import 7, three's first time in tubular reactor 3
It reacts the finely ground particles generated and sprays into roller 1 along roller 1 axial (close to horizontal direction) via the batch mixing spout 3.1 of rear end
It is interior；
The material for being simultaneously from charging and reaction system D is added in roller 1 downwards by feed pipe 6；From vent gas treatment system
The washing lotion of system E is sent by washing lotion import 10 in nitration mixture pipe 3, and the sulfuric acid being sent into for diluting the sour import 11 of cause second, the two exists
Hybrid reaction and the heat of dilution is discharged in nitration mixture pipe 3, finally sprayed into roller 1 downwards by nitration mixture nozzle 4.1, is anti-in roller 1
It answers and is granulated and reaction raw materials and thermal energy are provided；
Ammonia from ammonia station B2 is sent into spray ammonia pipe tube bank 5 through the second ammonia import 16, and the steam from steam pipe network A3 is through steaming
Vapor inlet 17 is sent into spray ammonia pipe tube bank 5, and the mixture of the two is most sprayed through multiple ammonia nozzles 12 to 1 bottom direction of roller afterwards, portion
Point enter 1 bottoms material of roller in, rest part rise, ammonia distributor 13 for evenly distribute is passed through spray ammonia pipe tube bank 5 in
Ammonia and steam.The material sprayed in each nozzle along different emission directions in roller 1 while mixing while react, side package, finally under
Drop down onto 1 bottom of roller；
Vent gas treatment workshop section E collect returning charge be sent into charging and revert system D, charging and revert system D in returning charge and
It is sent into roller 1 through feed pipe 6 again after the raw material mixing of addition, this partial material is mixed to form slurry with the water vapour in roller 1,
It is reacted by propylhomoserin and the particulate matter for falling into 1 bottom of roller is wrapped up again with the rolling of roller 1, in physics and chemical action
It is lower to form uniform spherical particle object, achieve the purpose that granulating and forming.The granules for going out roller 1 move to discharging structure 2 by discharging
Mouthfuls 14, which are sent into after-treatment system C, is dried, hot sieve, cooling, scalping, obtains final complex fertilizer product after dusting cover.Each system is received
Charging and revert system D are sent into the returning charge of collection, the tail gas and treatment and finishing section C productions that 2 top offgas outlet 15 of discharging structure is drawn
Raw tail gas is all sent into vent gas treatment workshop section E；The raw material being added in the charging and revert system D can rationally match as needed
System, such as following components alone or in combination can be made：In phosphorus ammonium, potash fertilizer, ammonium chloride, urea and ammonium bicarbonate and/or additive
It is at least one.
Using above system without presetting acid, non-wastewater discharge, safe and reliable, product particle epigranular, granulating rate is high,
15-25% can be improved in intensity good (up to 30N or so), system returning charge low (returning charge rate down to 15% or less), production capacity), nothing
Clay, product good water solubility need to be added.
Claims (6)
1. a kind of composite fertilizer generates system, including sequentially connected pretreatment system, granulating system, after-treatment system and charging and
Revert system, the granulating system and after-treatment system are also connected with exhaust treatment system, which is characterized in that the granulating system packet
The roller equipped with driving device is included, the roller rear end connects discharging structure, from top to bottom set successively in the leading portion of the roller
There are feed pipe, nitration mixture pipe, tubular reactor and spray ammonia pipe tube bank, the nitration mixture pipe, tubular reactor and spray ammonia pipe tube bank to be all provided with
There is nozzle；The feed pipe is connect with charging and revert system, and the tubular reactor connects through the first ammonia import and ammonia station respectively
It connects, is connect with pretreatment system through phosphor ammonium slurry import, is connect with sulfuric acid storage tank through the first sour import；The nitration mixture pipe passes through respectively
Washing lotion import is connect with exhaust treatment system, is connect with sulfuric acid storage tank through the second sour import；The spray ammonia pipe tube bank is through the second ammonia
Import is connect with ammonia station.
2. composite fertilizer as described in claim 1 generates system, which is characterized in that the pretreatment system includes that connection pre-processes
Slot and regulating tank；Steam pipe network is separately connected the steam inlet of pretreatment tank, regulating tank and spray ammonia pipe tube bank；The pretreatment tank
Washing lotion import also connect with exhaust treatment system.
3. composite fertilizer as claimed in claim 1 or 2 generates system, which is characterized in that the rear end of the tubular reactor sets court
To the batch mixing nozzle of roller axial direction, the rear end of the nitration mixture pipe is set towards downward nitration mixture nozzle, and the nitration mixture nozzle is located at institute
State the rear of batch mixing nozzle.
4. composite fertilizer as claimed in claim 3 generates system, which is characterized in that the level of the nitration mixture nozzle and batch mixing nozzle
Spacing 10-15cm, vertical interval 4-8.5cm.
5. composite fertilizer as claimed in claim 3 generates system, which is characterized in that the spray ammonia pipe is restrained along roller axially back and forth
Equipped with multiple downward ammonia nozzles, the top of the batch mixing nozzle of the tubular reactor between most latter two ammonia nozzle, into
Expects pipe is located above most previous ammonia nozzle or front.
6. composite fertilizer as claimed in claim 5 generates system, which is characterized in that the ammonia nozzle and cylinder bottom inner wall away from
From for 24-28cm, most previous ammonia nozzle is 60-70cm at a distance from drum front end, and the distance between adjacent ammonia nozzle is 36-
44cm。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810360752.7A CN108440056A (en) | 2018-04-20 | 2018-04-20 | Composite fertilizer generates system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810360752.7A CN108440056A (en) | 2018-04-20 | 2018-04-20 | Composite fertilizer generates system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108440056A true CN108440056A (en) | 2018-08-24 |
Family
ID=63201156
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810360752.7A Pending CN108440056A (en) | 2018-04-20 | 2018-04-20 | Composite fertilizer generates system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108440056A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005063654A2 (en) * | 2003-12-18 | 2005-07-14 | Georgia-Pacific Resins, Inc. | Extended-release nitrogen-containing granular fertilizer |
| CN102503648A (en) * | 2011-11-30 | 2012-06-20 | 湖北三宁化工股份有限公司 | Method for producing ammonium phosphate sulfate by S-NPK (Sulfur-Containing Nitrogen-Phosphorus-Potassium Compounds) device |
| CN106241765A (en) * | 2016-08-24 | 2016-12-21 | 湖北祥云(集团)化工股份有限公司 | The production method of a kind of Diammonium phosphate (DAP) and system |
-
2018
- 2018-04-20 CN CN201810360752.7A patent/CN108440056A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005063654A2 (en) * | 2003-12-18 | 2005-07-14 | Georgia-Pacific Resins, Inc. | Extended-release nitrogen-containing granular fertilizer |
| CN102503648A (en) * | 2011-11-30 | 2012-06-20 | 湖北三宁化工股份有限公司 | Method for producing ammonium phosphate sulfate by S-NPK (Sulfur-Containing Nitrogen-Phosphorus-Potassium Compounds) device |
| CN106241765A (en) * | 2016-08-24 | 2016-12-21 | 湖北祥云(集团)化工股份有限公司 | The production method of a kind of Diammonium phosphate (DAP) and system |
Non-Patent Citations (1)
| Title |
|---|
| 冯玉海 等: "半料浆法管式反应器复合肥生产工艺技术", 《磷肥与复肥》 * |
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Application publication date: 20180824 |