CN102503636A - Ammonium chloride agglomerating prilling method - Google Patents
Ammonium chloride agglomerating prilling method Download PDFInfo
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- CN102503636A CN102503636A CN2011103312124A CN201110331212A CN102503636A CN 102503636 A CN102503636 A CN 102503636A CN 2011103312124 A CN2011103312124 A CN 2011103312124A CN 201110331212 A CN201110331212 A CN 201110331212A CN 102503636 A CN102503636 A CN 102503636A
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- ammonium chloride
- prilling
- sulphuric acid
- dilute sulphuric
- particle
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Abstract
The invention relates to an ammonium chloride agglomerating prilling method, which solves problems of large device corrosivity, high cost and low prilling rate caused by extruding prilling and crystallizing prilling, and solves problems of poor color, low prilling rate and the like of produced particles through agglomerating prilling. The ammonium chloride agglomerating prilling method includes the following steps: evenly mixing ammonium chloride, carbamide and calcium carbonate in proportion, adding the mixture into a rotary drum granulator, spraying dilute sulphuric acid into the rotary drum granulator, conducting granulating by aid of chemical reactions and chemical reaction heat of the dilute sulphuric acid, the calcium carbonate and the carbamide and adding defined amount of steam for granulating, and obtaining finished product particle ammonium chloride after drying, cooling and sieving. Particles prepared with the method are uniform, smooth and white in color. In addition, by means of the method, prilling rate is high, production cost is reduced, corrosivity to devices is small, process is simple, capacity is large, and large-scale industrialized production can be achieved.
Description
Technical field
The present invention relates to the agrochemical working method, be specially a kind of ammonium chloride agglomeration granulation method.
Background technology
Ammonium chloride is a kind of instant nitrogenousfertilizer, and nitrogen content is about 24 ~ 25%.It is applicable to neutrality and alkaline soil, after farm crop such as paddy rice, corn, cotton, millet, rape are used effect of increasing production is arranged, have after particularly paddy rice and corn are used resistant to lodging with return advantages such as seedling is fast.But ammonium chloride product is generally Powdered or little grains at present, and water absorbability Da Yi lumps, in application, is prone to adhere to and causes the burning seedling on leaf, the stem.Powdery ammonium chloride is realized that prilling can address the above problem, and have certain slow releasing function after using, can improve fertilizer utilization ratio.
The agglomeration technique of particle ammonium chloride mainly contains three kinds: 1. crystallization granulation: produce in the ammonium chloride in soda and sociation center; Cold, that the salting-out crystallizer volume is done is bigger, so that let the ammonium chloride nucleus that the ammonium chloride that granulates of growing up of the sufficiently long residence time is arranged in two molds.This method operational condition is strict, and the particle maximum diameter is about 1mm, needs producer to possess the ultra-large type mold, or reduces the throughput of existing mold; 2. mechanical presses granulation: under high pressure be squeezed into granular macrobead to powdery ammonium chloride or strip is broken into granular again.This technical process is long, and particle is not round, and is big to corrosion on Equipment property, and production cost is high; Yield poorly, energy consumption is big.3. in recent years; Steam reunion comminution granulation is applied in the ammonium chloride granulation gradually; The granulating principle of agglomeration granulation technology is the amount of liquid phase that the base fertilizer of certain fineness produces by salt autolysis; Impel particle in continuous motion down through mechanical agitation, storeroom collides each other, push, rolling makes it closely and moulding, the adhesion granulating of reuniting.Difference according to granulating equipment can be divided into technologies such as disk granulation, drum granulating.This process method is simple, throughput is big, but is used for the agglomeration granulation method of ammonium chloride at present, but exists granulating rate low, and energy consumption is big, shortcomings such as deficiency such as particle appearance characteristic difference.
Chinese patent CN1183396A discloses granular ammonium chloride and working method thereof, and this method is that powdery ammonium chloride and solid binder are mixed stirring, extrusion molding according to a certain percentage, makes granular ammonium chloride after the dry screened.Shortcomings such as but this pair roller type extruder grain technology exists the particle particle shape poor, and cost is high, equipment corrosion is big, balling ratio is low.
Chinese patent CN101265128A discloses the preparation method of particle nitrogen fertilizer, and this method mainly is that urea and ammonium chloride are mixed back entering propylhomoserin method tablets press, utilizes dilute sulphuric acid and synthetic ammonia to carry out the propylhomoserin reaction and makes its granulating.But amount of urea reaches 30 ~ 40% in this method, and cost is higher; Also comprise ammonium sulfate, zinc sulfate, Attapulgite, intelligent peptide and tensio-active agent etc. in the raw material, the batching more complicated is inappropriate for the mass mechanized granulation.
Summary of the invention
The present invention is big for the equipment corrosion that solves extruder grain and crystallization granulation and bring, cost is high, granulating rate is low and agglomeration granulation is produced problems such as particle shade deviation, granulating rate be low, and a kind of ammonium chloride agglomeration granulation method is provided.
The present invention adopts following technical scheme to realize: ammonium chloride agglomeration granulation method, may further comprise the steps,
(1) ammonium chloride, urea, lime carbonate are mixed in proportion the back and add rotary drum granulator, the parts by weight of each component are 80 ~ 84 parts of ammonium chlorides, 8 ~ 12 parts in urea, 5 ~ 10 parts in lime carbonate;
(2) in described rotary drum granulator, spraying into proportion is 1.41 ~ 1.51 g/cm
3Dilute sulphuric acid, the add-on of dilute sulphuric acid is 5 ~ 8% of a raw material, utilizes the chemical reaction of dilute sulphuric acid and lime carbonate, urea and chemical reaction heat to carry out granulation, and adds an amount of steam, makes the prilling temperature in the tablets press reach 40 ~ 50 ℃;
(3) raw material carries out granulation in rotary drum granulator, obtains particle ammonium chloride work in-process;
(4) above-mentioned work in-process obtain finished particle ammonium chloride through oven dry, the screening of cooling back.
Beneficial effect of the present invention is following: the invention provides a kind of is that additive, sulfuric acid are liquid-containing binder, pass through the novel method that the agglomeration granulation technology is produced ammonium chloride particle with inorganic salt, has following characteristics:
1, the present invention adopts lime carbonate as additive, has than traditional granulation process additive therefor consumption to lack wide material sources, nontoxic, advantages of cheap price.And the moderate-element Ca that contains in the calcium salt can promote growing of farm crop; The uniform particles of making is smooth is white in color in institute, and granulating rate can reach about 75%.
2, the present invention adopts dilute sulphuric acid as liquid-containing binder, and lime carbonate and sulfuric acid reaction generate sticking calcium sulfate on the one hand, become the particulate core; Urea and sulfuric acid reaction generate sticking ureasulfuric acid on the other hand can increase raw material viscosity, makes particle be difficult for fragmentation and also grows up gradually.The present invention makes full use of chemical water and the chemical reaction heat that dilute sulphuric acid and calcium salt, urea generation chemical reaction generate, and reduces the moisture that adds in the granulation process, improves prilling temperature, can alleviate the oven dry load, enhances productivity.
3, the present invention adopts the agglomeration granulation technology, reduces production costs, and little to corrosion on Equipment property, technology is simple, and production capacity is big, can realize large-scale industrialization production.
Embodiment
A kind of ammonium chloride agglomeration granulation method may further comprise the steps,
(1) ammonium chloride, urea, lime carbonate are mixed in proportion the back and add rotary drum granulator, the parts by weight of each component are 80 ~ 84 parts of ammonium chlorides, 8 ~ 12 parts in urea, 5 ~ 10 parts in lime carbonate;
(2) in described rotary drum granulator, spraying into proportion is 1.41 ~ 1.51 g/cm
3Dilute sulphuric acid, the add-on of dilute sulphuric acid is 5 ~ 8% of a raw material, utilizes the chemical reaction of dilute sulphuric acid and lime carbonate, urea and chemical reaction heat to carry out granulation, and adds an amount of steam, makes the prilling temperature in the tablets press reach 40 ~ 50 ℃;
(3) raw material carries out granulation in rotary drum granulator, obtains particle ammonium chloride work in-process;
(4) above-mentioned work in-process obtain finished particle ammonium chloride through oven dry, the screening of cooling back.
In the described step (4), the inlet temperature of drying used dryer is 150 ~ 180 ℃, and temperature out is 60 ~ 80 ℃.
In the described step (4), the particle ammonium chloride work in-process after the oven dry are through one-level cooling screening, and then through the secondary cooling, screening obtains the finished granule that particle diameter is 2 ~ 5mm through finished product sieve at last.
In the practical implementation process,
Embodiment 1
(ammonium chloride: urea: lime carbonate=80:10:10) joins in the whisking appliance that diameter is 1.3m and mixes by a certain percentage with ammonium chloride and stopping composition; Being sent to diameter is that 1.2m, length are in the cylinder tablets press of 7.0m, sprays into 6.5% 1.51 g/cm then
3Dilute sulphuric acid, an amount of steam of humidity adding according to batching carries out granulation.The work in-process of gained are 150 ℃ through inlet temperature, and temperature out is 80 ℃ a drying machine drying, through one-level cooling screening, and then through the secondary cooling, are that the particle of 2 ~ 5mm is as finished product through choosing particle diameter after the finished product sieve screening at last.
Said product uniform particles outward appearance is pure white, and measuring its nitrogen content is 24.3%, and granulating rate reaches 70.2%; Moisture content≤2%, anti-crushing power>=20N.
Embodiment 2
(ammonium chloride: urea: lime carbonate=83:12:5) joins in the whisking appliance that diameter is 1.3m and mixes, and being sent to diameter is that 1.2m, length are in the cylinder tablets press of 7.0m, sprays into 5% 1.41g/cm then by a certain percentage with ammonium chloride and stopping composition
3Dilute sulphuric acid, an amount of steam of humidity adding according to batching carries out granulation.The work in-process of gained are 180 ℃ through inlet temperature, and temperature out is 70 ℃ a drying machine drying, through one-level cooling screening, and then through the secondary cooling, are that the particle of 2 ~ 5mm is as finished product through choosing particle diameter after the finished product sieve screening at last.
Said product uniform particles outward appearance is pure white, and measuring its nitrogen content is 23.8%, and granulating rate reaches 69.5%; Moisture content≤2%, anti-crushing power>=20N.
Embodiment 3
(ammonium chloride: urea: lime carbonate=82:9:9) joins in the whisking appliance that diameter is 1.3m and mixes, and being sent to diameter is that 1.2m, length are in the cylinder tablets press of 7.0m, sprays into 7% 1.48 g/cm then by a certain percentage with ammonium chloride and stopping composition
3Dilute sulphuric acid, an amount of steam of humidity adding according to batching carries out granulation.The work in-process of gained are 160 ℃ through inlet temperature, and temperature out is 60 ℃ a drying machine drying, through one-level cooling screening, and then through the secondary cooling, are that the particle of 2 ~ 5mm is as finished product through choosing particle diameter after the finished product sieve screening at last.
Said product uniform particles outward appearance is pure white, and measuring its nitrogen content is 23.5%, and granulating rate reaches 73.4%; Moisture content≤2%, anti-crushing power>=20N.
Embodiment 4
(ammonium chloride: urea: lime carbonate=84:8:8) joins in the whisking appliance that diameter is 1.3m and mixes by a certain percentage with ammonium chloride and stopping composition; Being sent to diameter is that 1.2m, length are in the cylinder tablets press of 7.0m, sprays into 6.5% 1.44 g/cm then
3Dilute sulphuric acid, an amount of steam of humidity adding according to batching carries out granulation.The work in-process of gained are 170 ℃ through inlet temperature, and temperature out is 80 ℃ a drying machine drying, through one-level cooling screening, and then through the secondary cooling, are that the particle of 2 ~ 5mm is as finished product through choosing particle diameter after the finished product sieve screening at last.
Said product uniform particles outward appearance is pure white, and measuring its nitrogen content is 23.2%, and granulating rate reaches 78.3%; Moisture content≤2%, anti-crushing power>=20N.
Claims (3)
1. ammonium chloride agglomeration granulation method is characterized in that: may further comprise the steps,
(1) ammonium chloride, urea, lime carbonate are mixed in proportion the back and add rotary drum granulator, the parts by weight of each component are 80 ~ 84 parts of ammonium chlorides, 8 ~ 12 parts in urea, 5 ~ 10 parts in lime carbonate;
(2) in described rotary drum granulator, spraying into proportion is 1.41 ~ 1.51 g/cm
3Dilute sulphuric acid, the add-on of dilute sulphuric acid is 5 ~ 8% of a raw material, utilizes the chemical reaction of dilute sulphuric acid and lime carbonate, urea and chemical reaction heat to carry out granulation, and adds an amount of steam, makes the prilling temperature in the tablets press reach 40 ~ 50 ℃;
(3) raw material carries out granulation in rotary drum granulator, obtains particle ammonium chloride work in-process;
(4) above-mentioned work in-process obtain finished particle ammonium chloride through oven dry, the screening of cooling back.
2. ammonium chloride agglomeration granulation method according to claim 1 is characterized in that: in the described step (4), the inlet temperature of drying used dryer is 150 ~ 180 ℃, and temperature out is 60 ~ 80 ℃.
3. ammonium chloride agglomeration granulation method according to claim 1; It is characterized in that: in the described step (4); Particle ammonium chloride work in-process after the oven dry are through one-level cooling screening, and then through the secondary cooling, screening obtains the finished granule that particle diameter is 2 ~ 5mm through finished product sieve at last.
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| CN2011103312124A CN102503636A (en) | 2011-10-27 | 2011-10-27 | Ammonium chloride agglomerating prilling method |
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| CN2011103312124A CN102503636A (en) | 2011-10-27 | 2011-10-27 | Ammonium chloride agglomerating prilling method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102910991A (en) * | 2012-09-29 | 2013-02-06 | 湖北富邦科技股份有限公司 | Large-granule sustained-release ammonium chloride fertilizer, preparation method thereof and special granulating sustained-release material |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1356298A (en) * | 2000-11-30 | 2002-07-03 | 南化集团研究院 | Process for preparing granular fertilizer |
| EA002709B1 (en) * | 1998-10-13 | 2002-08-29 | Эйрборн Индастриал Минералз Инк. | Method of formulating alkali metal salts |
| CN101265128A (en) * | 2008-04-16 | 2008-09-17 | 江苏华昌化工股份有限公司 | Method for preparing particle nitrogen fertilizer |
| CN102206112A (en) * | 2010-03-31 | 2011-10-05 | 王茂国 | Ammoniation-granulation process for producing potassium sulfate composite fertilizer |
-
2011
- 2011-10-27 CN CN2011103312124A patent/CN102503636A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EA002709B1 (en) * | 1998-10-13 | 2002-08-29 | Эйрборн Индастриал Минералз Инк. | Method of formulating alkali metal salts |
| CN1356298A (en) * | 2000-11-30 | 2002-07-03 | 南化集团研究院 | Process for preparing granular fertilizer |
| CN101265128A (en) * | 2008-04-16 | 2008-09-17 | 江苏华昌化工股份有限公司 | Method for preparing particle nitrogen fertilizer |
| CN102206112A (en) * | 2010-03-31 | 2011-10-05 | 王茂国 | Ammoniation-granulation process for producing potassium sulfate composite fertilizer |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102910991A (en) * | 2012-09-29 | 2013-02-06 | 湖北富邦科技股份有限公司 | Large-granule sustained-release ammonium chloride fertilizer, preparation method thereof and special granulating sustained-release material |
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Application publication date: 20120620 |