CN103524150A - Method and device for producing granular nitric phosphateby decomposing phosphate ore through nitric acid - Google Patents
Method and device for producing granular nitric phosphateby decomposing phosphate ore through nitric acid Download PDFInfo
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- CN103524150A CN103524150A CN201310447235.0A CN201310447235A CN103524150A CN 103524150 A CN103524150 A CN 103524150A CN 201310447235 A CN201310447235 A CN 201310447235A CN 103524150 A CN103524150 A CN 103524150A
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Abstract
The invention discloses a method and a device for producing granular nitric phosphate by decomposing phosphate ore through nitric acid, wherein the method comprises acid splitting, cooling crystallization, neutralizing, concentrating and pelleting, the following steps are conducted after a material is pelletized: A) drying: drying the material in a drying rotary drum through a spiral shoveling plate, then rounding the material, and finally drying the material again through the shoveling plate; B) screening: screening qualified granules and disqualified granules; C) returning the disqualified granules screened in the step B) to the pelletizing step for pelletizing and cooling the qualified granules; D) screening the material cooled in the step C) again, returning the disqualified granules into the pelletizing step for pelletizing and packaging the qualified granules. The granular nitric phosphate fertilizer produced through the method provided by the invention is uniform regular round granules, the attractiveness of the product is high, and the phenomenon of secondary separation segregation does not occur in the application.
Description
Technical field
The present invention relates to agricultural fertilizer technical field, be specifically related to method and device that a kind of decomposing phosphorite by using nitric acid is produced particle nitrophosphate fertilizer.
Background technology
Nitrophosphate fertilizer is a class fertilizer that contains nitric nitrogen, can make bulk blended fertilizer with other fertilizer.If the granularity shape of granulated fertilizer is inconsistent, the proportion between particle differs larger, easily causes the segregation of Bulk Blending Fertilizer product serious, makes plant absorb nutrient uneven.Existing research shows, the spherical granules of even contributes to overcome the segregation phenomena of product.
At present, conventional decomposing phosphorite by using nitric acid is produced particle nitrophosphate fertilizer, and concrete process is: first by phosphorus ore grinding, then carry out acidolysis reaction with nitric acid, then evaporate, granulation; Particle nitro fertilizer after granulation is introduced into oven dry rotating cylinder and dries, and after drying, sieves by sieve apparatus again, and it is cooling that screening qualified finished particle is out introduced into cooling system, then sends to parcel, packing by finished product belt conveyer; Large-particle fertilizer out of screening enters to return in crusher and carries out fragmentation, then together returns to granulation in granulating system with small-particle fertilizer again, then carries out cooling, parcel, packing.The oven dry barrel configuration of existing use is as follows: in the rotating cylinder housing of hollow cylindrical, connected spiral flight district He Zhi flight district is set, granulated fertilizer is dried the district's discharging of Hou，You Zhi flight through spiral flight district in rotating cylinder housing.
The defect that above-mentioned prior art exists is: just granulation granulated fertilizer high humidity out, intensity is low, granulated fertilizer when drying after dry in spiral flight district also has certain humidity, during again through straight flight district, easily make particle modification, make the particulate product of discharging mellow and full not, also has certain humidity, at this moment sieve the screen cloth of easy blocking screen extension set, make the particle nitrophosphate fertilizer after granulation can not 100% screening completely, having the underproof particle of part follows qualified particle and enters together oven dry below, packaging system, cause that product particle is not of uniform size to be caused, not only affected the aesthetics of product, in the time of also can making to apply, easily there is the phenomenon of secondary separation segregation, the skewness that causes nutrient, affect absorption and the production of plant.
Summary of the invention
The object of the invention is to overcome the defect of above-mentioned prior art, provide a kind of decomposing phosphorite by using nitric acid to produce the method for particle nitrophosphate fertilizer, with the particle nitrophosphate fertilizer that the method is produced, it is uniformly positive circular granular, not only improved the aesthetics of product, the phenomenon that occurs secondary separation segregation in the time of can also overcoming product application, improves the efficient of application.
For achieving the above object, the present invention adopts following technical scheme:
Decomposing phosphorite by using nitric acid is produced a method for particle nitrophosphate fertilizer, comprises step, crystallisation by cooling step, neutralization procedure, enrichment step, the granulation step of ground phosphate rock being decomposed with nitric acid, it is characterized in that, after granulation, material is carried out to following processing:
A) dry: material is first dried by spiral flight in drying rotating cylinder, and then material is carried out to round as a ball processing, finally by straight flight, again dry;
B) screening: sieve out qualified particle and defective particle;
C) step B) screening defective particle out returns in granulation step and carries out granulation, and qualified particle carries out cooling;
D) to step C) cooled material sieves again, and defective particle returns in granulation step and carries out granulation, and qualified particle is packed.
Object of the present invention can also take following measures to reach:
Realizing a kind of mode of the present invention is: step B) screening defective particle out comprises macrobead and small-particle, and macrobead first carries out fragmentation, then returns to granulation in granulation step together with small-particle.
Realizing a kind of mode of the present invention is: the Material control moisture content after granulation is 1%～3%, then dries.
Realizing a kind of mode of the present invention is: during oven dry, the time that material is round as a ball is 2～3min,, the rotating speed of drying rotating cylinder is 4～6r/min.
Another object of the present invention is to provide a kind of oven dry rotating cylinder, this oven dry rotating cylinder can be processed into the granulated fertilizer after granulation the positive circular granular that intensity is high, effectively prevent that granulated fertilizer from stopping up screen cloth, improves the aesthetics of product and the defect that overcomes the secondary separation segregation of product.
For achieving the above object, the present invention adopts following technical scheme:
A kind of oven dry rotating cylinder, it comprises rotating cylinder housing, and described rotating cylinder housing is hollow cylindrical, and described rotating cylinder enclosure interior sets gradually spiral flight district, round as a ball district ,Zhi flight district vertically, spiral flight is installed in described spiral flight district, straight flight is installed in described straight flight district.
Described spiral flight district length is vertically 4m～6m.
Described round as a ball district length is vertically 3m～4m.
Compared with prior art, the invention has the beneficial effects as follows:
1, method of the present invention is when material drying, first with spiral flight, material is tentatively dried, suitably reduced the humidity of material, then material is carried out to round as a ball processing, improved roundness degree and the intensity of particle, while effectively preventing from sieving, granulated fertilizer stops up screen cloth, has improved the tolerance range of screening, the product particle shape that obtains is mellow and full, size evenly, aesthetics is high, can overcome the defect that secondary separation segregation appears in application; And cooled material also sieves again, eliminated the impact of failing to sieve completely while sieving for the first time, guarantee finished product materials even particle size before packing.
2, oven dry rotating cylinder of the present invention has also been established round as a ball district between spiral flight district He Zhi flight district, and material needs just to enter the oven dry of straight flight district, discharging after round as a ball district carries out round as a ball processing after being dried by spiral flight district, makes fertiliser granulates more mellow and full attractive in appearance.
Accompanying drawing explanation
Fig. 1 is process flow sheet of the present invention;
Fig. 2 is the structural representation of drying unit of the present invention.
Embodiment
Below by specific embodiment, the present invention is described in further detail.
Please refer to Fig. 1, the method that a kind of decomposing phosphorite by using nitric acid of the present invention is produced particle nitrophosphate fertilizer, comprises step, crystallisation by cooling step, neutralization procedure, enrichment step, the granulation step of ground phosphate rock being decomposed with nitric acid, after granulation, material is carried out to following processing:
A) dry: material is first dried by spiral flight in drying rotating cylinder, and then material is carried out to round as a ball processing, finally by straight flight, again dry;
B) screening: sieve out qualified particle and defective particle;
C) step B) screening defective particle out returns in granulation step and carries out granulation, and qualified particle carries out cooling;
D) to step C) cooled material sieves again, and defective particle returns in granulation step and carries out granulation, and qualified particle is packed.
Wherein, step B) screening defective particle out comprises macrobead and small-particle, and macrobead first carries out fragmentation, then returns to granulation in granulation step together with small-particle.
In the method for the invention, it is qualified particle that particle diameter meets the particle that the footpath grain of finished product requires, and the particle that particle diameter is greater than qualified grain diameter is macrobead, and the particle that particle diameter is less than qualified grain diameter is small-particle, and macrobead and small-particle are defective particle.
Decomposing phosphorite by using nitric acid is produced a method for particle nitrophosphate fertilizer, comprises the following steps:
1) with nitric acid, ground phosphate rock is decomposed;
2) separation: the number acid insolubles in acidolysis process is separated and removed;
3) crystallisation by cooling: material is carried out cooling, make nitrocalcite crystallization in material become solid and separate out, then solid particulate is filtered out;
4) neutralization: pass into ammonia in material, make it to react with nitric acid, phosphoric acid in solution, generate nitrophosphate fertilizer solution;
5) concentrated: nitrophosphate fertilizer solution to be carried out to high temperature and concentrate, remove the moisture in solution;
6) granulation, and the moisture content of controlling the material after granulation is 1%;
7) dry: material enters to dry in rotating cylinder and first by spiral flight, tentatively dried, and then material is carried out to round as a ball processing, finally by straight flight, again dry; The time of the round as a ball processing of material is 2min, and the rotating speed of drying rotating cylinder is 4r/min;
8) screening: with 18 object screen clothes, material is sieved, by screen cloth be qualified particle and small-particle, what can not pass through screen cloth is macrobead; With 15 object screen clothes, qualified particle and small-particle are sieved again, by screen cloth be small-particle, do not pass through for qualified particle;
9) large granular materials that step 8) screening obtains first carries out fragmentation, then returns to step 6) and carry out granulation together with small particles material;
10) the qualified particle that step 8) sieves is out first cooling, then with 18 object screen clothes, again sieves, and screening qualified particle is out packed, and screening defective particle out returns to step 6) and carries out granulation again.
Decomposing phosphorite by using nitric acid is produced a method for particle nitrophosphate fertilizer, comprises the following steps:
1) with nitric acid, ground phosphate rock is decomposed;
2) crystallisation by cooling: material is carried out cooling, make nitrocalcite crystallization in material become solid and separate out, then solid particulate is filtered out;
3) neutralization: pass into ammonia in material, make it to react with nitric acid, phosphoric acid in solution, generate nitrophosphate fertilizer solution;
4) concentrated: nitrophosphate fertilizer solution to be carried out to high temperature and concentrate, remove the moisture in solution;
5) granulation, and the moisture content of controlling the material after granulation is 2%;
6) dry: material enters to dry in rotating cylinder and first by spiral flight, tentatively dried, and then material is carried out to round as a ball processing, finally by straight flight, again dry, the time of the round as a ball processing of material is 3min, and the rotating speed of drying rotating cylinder is 4r/min;
7) screening: with 15 object screen clothes, material is sieved, by screen cloth be qualified particle and small-particle, what can not pass through screen cloth is macrobead; With the 10 qualified particles in object screen clothes ground and small-particle, sieve again, by screen cloth be small-particle, what do not pass through is qualified particle;
8) large granular materials that step 7) screening obtains first carries out fragmentation, then returns to step 5) and carry out granulation together with small particles material;
9) the qualified particle that step 7) sieves is out first cooling, and then, with 15 object screen cloth screenings, screening qualified particle is out packed, and screening defective particle out returns to step 5) and carries out granulation again.
Decomposing phosphorite by using nitric acid is produced a method for particle nitrophosphate fertilizer, comprises the following steps:
1) with nitric acid, ground phosphate rock is decomposed;
2) crystallisation by cooling: material is carried out cooling, make nitrocalcite crystallization in material become solid and separate out, then solid particulate is filtered out;
3) neutralization: pass into ammonia in material, make it to react with nitric acid, phosphoric acid in solution, generate nitrophosphate fertilizer solution;
4) concentrated: nitrophosphate fertilizer solution to be carried out to high temperature and concentrate, remove the moisture in solution;
5) granulation, and the moisture content of controlling the material after granulation is 3%;
6) dry: material enters to dry in rotating cylinder and first by spiral flight, tentatively dried, and then material is carried out to round as a ball processing, finally by straight flight, again dry, the time of the round as a ball processing of material is 3min, and the rotating speed of drying rotating cylinder is 6r/min;
7) screening: with 10 object screen clothes, material is sieved, by screen cloth be qualified particle and small-particle, what can not pass through screen cloth is macrobead; With the 4 qualified particles in object screen clothes ground and small-particle, sieve again, by screen cloth be small-particle, what do not pass through is qualified particle;
8) large granular materials that step 7) screening obtains first carries out fragmentation, then returns to step 5) and carry out granulation together with small particles material;
9) the qualified particle that step 7) sieves is out first cooling, then with 10 eye mesh screens, sieves for the second time, and screening qualified particle is out packed, and screening defective particle out returns to step 5) and carries out granulation again.
Please refer to Fig. 2, a kind of oven dry rotating cylinder of the present invention, it comprises rotating cylinder housing 4, described rotating cylinder housing 4 is hollow cylindrical, described rotating cylinder enclosure interior sets gradually spiral flight district 1,2 ,Zhi flight districts 3, round as a ball district vertically, the interior installation spiral flight 1a in described spiral flight district 1, the straight flight 3a of described straight flight district 3 interior installation.The temperature of the granulated fertilizer after granulation is higher, enters after rotating cylinder housing, and along with the rotation of rotating cylinder housing, granular fertilizer grain contacts with spiral flight and carries out heat transmission, cools, and humidity reduces; Then granulated fertilizer enters round as a ball district, at round as a ball district endoparticle material, along with the inwall of rotating cylinder housing is constantly clashed in the rotation of rotating cylinder housing, forms positive circular granular; Finally, granule materials contacts cooling through straight flight district with straight flight, further cooling forming.
In preferred version, described spiral flight district 1 length is vertically 5m.Described round as a ball district 2 length is vertically 3m.
The announcement of book and instruction according to the above description, those skilled in the art in the invention can also change and revise above-mentioned embodiment.Therefore, the present invention is not limited to embodiment disclosed and described above, to modifications and changes more of the present invention, also should fall in the protection domain of claim of the present invention.In addition,, although used some specific terms in this specification sheets, these terms just for convenience of description, do not form any restriction to the present invention.
Claims (7)
1. decomposing phosphorite by using nitric acid is produced a method for particle nitrophosphate fertilizer, comprises step, crystallisation by cooling step, neutralization procedure, enrichment step, the granulation step of ground phosphate rock being decomposed with nitric acid, it is characterized in that, after granulation, material is carried out to following processing:
A) dry: material is first dried by spiral flight in drying rotating cylinder, and then material is carried out to round as a ball processing, finally by straight flight, again dry;
B) screening: sieve out qualified particle and defective particle;
C) step B) screening defective particle out returns in granulation step and carries out granulation, and qualified particle carries out cooling;
D) to step C) cooled material sieves again, and defective particle returns in granulation step and carries out granulation, and qualified particle is packed.
2. decomposing phosphorite by using nitric acid as claimed in claim 1 is produced the method for particle nitrophosphate fertilizer, it is characterized in that: step B) screening defective particle out comprises macrobead and small-particle, macrobead first carries out fragmentation, then returns to granulation in granulation step together with small-particle.
3. decomposing phosphorite by using nitric acid as claimed in claim 1 is produced the method for particle nitrophosphate fertilizer, it is characterized in that: the Material control moisture content after granulation is 1%～3%, then dries.
4. decomposing phosphorite by using nitric acid as claimed in claim 1 is produced the method for particle nitrophosphate fertilizer, it is characterized in that: during oven dry, the time that material is round as a ball is 2～3min, and, the rotating speed of drying rotating cylinder is 4～6r/min.
5. an oven dry rotating cylinder, comprise rotating cylinder housing, described rotating cylinder housing is hollow cylindrical, it is characterized in that: described rotating cylinder enclosure interior is established spiral flight district, the round as a ball district ,Zhi flight district being communicated with successively vertically, spiral flight is installed in described spiral flight district, straight flight is installed in described straight flight district.
6. oven dry rotating cylinder as claimed in claim 5, is characterized in that: described spiral flight district length is vertically 4m～6m.
7. oven dry rotating cylinder as claimed in claim 5, is characterized in that: described round as a ball district length is vertically 3m～4m.
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| CN201310447235.0A CN103524150B (en) | 2013-09-27 | 2013-09-27 | Method and device for producing granular nitric phosphateby decomposing phosphate ore through nitric acid |
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| CN201310447235.0A CN103524150B (en) | 2013-09-27 | 2013-09-27 | Method and device for producing granular nitric phosphateby decomposing phosphate ore through nitric acid |
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| CN103524150B CN103524150B (en) | 2015-04-15 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105858704A (en) * | 2015-04-01 | 2016-08-17 | 贵州芭田生态工程有限公司 | A method of preparing a polyphosphate composite fertilizer through decomposing phosphate rock with nitric acid |
| CN108530207A (en) * | 2018-07-02 | 2018-09-14 | 郑州大学 | A method of preparing particle urea nitro-compound fertilizer with urea decomposing phosphorite by using nitric acid |
| CN114413593A (en) * | 2021-09-03 | 2022-04-29 | 宁波盈前科技有限公司 | Combined material drying device for bioactive amino acid, peptide and protein powder |
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| CN1313263A (en) * | 2000-03-10 | 2001-09-19 | 四川大学 | Process for preparing compound phosphorus nitrate fertilizer by spray, freeze, crystallization and decorbonizing and decalcifying hydrazidine |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105858704A (en) * | 2015-04-01 | 2016-08-17 | 贵州芭田生态工程有限公司 | A method of preparing a polyphosphate composite fertilizer through decomposing phosphate rock with nitric acid |
| CN108530207A (en) * | 2018-07-02 | 2018-09-14 | 郑州大学 | A method of preparing particle urea nitro-compound fertilizer with urea decomposing phosphorite by using nitric acid |
| CN114413593A (en) * | 2021-09-03 | 2022-04-29 | 宁波盈前科技有限公司 | Combined material drying device for bioactive amino acid, peptide and protein powder |
| CN114413593B (en) * | 2021-09-03 | 2023-08-29 | 宁波盈前科技有限公司 | Combined material drying device for bioactive amino acid, peptide and protein powder |
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Owner name: GUIZHOU BATIAN ECOLOGICAL ENGINEERING CO., LTD. Effective date: 20150420 |
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Effective date of registration: 20150420 Address after: 518057 Guangdong province Shenzhen city Nanshan District high tech park two Hing Road No. 10 Patentee after: Batian Ecological Engineering Co., Ltd., Shenzhen Patentee after: GUIZHOU BATIAN ECOLOGICAL ENGINEERING CO., LTD. Address before: 518057 Guangdong province Shenzhen city Nanshan District high tech park two Hing Road No. 10 Patentee before: Batian Ecological Engineering Co., Ltd., Shenzhen |