CN101265128B - Method for preparing particle nitrogen fertilizer - Google Patents
Method for preparing particle nitrogen fertilizer Download PDFInfo
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- CN101265128B CN101265128B CN2008100236998A CN200810023699A CN101265128B CN 101265128 B CN101265128 B CN 101265128B CN 2008100236998 A CN2008100236998 A CN 2008100236998A CN 200810023699 A CN200810023699 A CN 200810023699A CN 101265128 B CN101265128 B CN 101265128B
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Abstract
The invention relates to a method for producing a granular nitrogen fertilizer. The fertilizer is mainly made from the following raw materials: urea, ammonium chloride, diluted sulfuric acid and synthetic ammonia. The method comprises the following steps: mixing urea and ammonium chloride, loading in a granulating machine using ammonia-acid method, introducing diluted sulfuric acid and synthetic ammonia to the granulating machine, allowing ammonia-acid reactions, heating the materials inside the granulating machine up to 50-70 DEG C by using the heat released during the ammonia-acid reactions, wherein the additional amounts of diluted sulfuric acid and synthetic ammonia are controlled to enable the pH value of raw materials 6.0-6.2, transferring to a rotating drum machine for rotating drum granulation, oven-drying to obtain granular nitrogen fertilizer semi-product, and sieving the nitrogen fertilizer semi-product to obtain the granular nitrogen fertilizer. The produced granular nitrogen fertilizer has high nitrogen content and low water content.
Description
Technical field
The invention belongs to the agrochemical technical field, particularly relate to a kind of preparation method of particle nitrogen fertilizer.
Background technology
Nitrogen is one of three essential big nutritive elements of plant, and nitrogenous fertilizer is the maximum a kind of fertilizer of agricultural application.The main nitrogen fertilizers of China has urea, bicarbonate of ammonia, ammonium chloride, ammonium sulfate, ammonium nitrate etc. at present.
The ammonium chloride overwhelming majority is the byproduct that " soda and sociation center " produces soda ash (industrial sodium carbonate).Ammonium chloride is a kind of important nitrogenous fertilizer, and is cheap, fertilizer efficiency is better.But ammonium chloride product is generally Powdered or little grains at present, water absorbability is bigger, deposits easy caking.Cascading water is not smooth during use, can not trickle down equably, easily adheres on leaf, the stem, causes the burning seedling.Ammonium chloride is caused the low particle of water content, the inconvenience of using more than can solving.At present, it mainly is that powdery ammonium chloride directly or after adding adhesive substance is used the mechanical presses method that powdery ammonium chloride is caused the particulate method, makes sheet or column.Become cylindrical pellet as mechanical presses behind Shuanghuan Chem Group Co., Hubei's employing interpolation tackiness agent.But there is following shortcoming in the mechanical presses method: after adding adhesive substance, the content of nitrogen descends to some extent; The pellet moisture height that is pressed into, granule strength is little, the easily broken powder that produces; Column or platy shaped particle, mobile poor, spill Shi Renghui and remain on leaf, the stem; Physics extruding efficient is low, is unsuitable for large-scale ammonium chloride enterprise and is used for handling in a large number powdery ammonium chloride.
Summary of the invention
Technical problem to be solved by this invention is in order to overcome the deficiencies in the prior art, a kind of preparation method of particle nitrogen fertilizer to be provided, and nitrogenous fertilizer nitrogen content height, water content that this method makes are low.
For achieving the above object, the present invention takes following technical scheme:
A kind of preparation method of particle nitrogen fertilizer, the raw material of particle nitrogen fertilizer mainly is made up of urea, ammonium chloride, dilute sulphuric acid and synthetic ammonia, and this preparation method comprises the steps:
(1), after being mixed, urea and ammonium chloride enters propylhomoserin method tablets press;
(2), in described tablets press, feed dilute sulphuric acid and synthetic ammonia and carry out the propylhomoserin reaction, the heat that utilizes described propylhomoserin exothermic heat of reaction to provide makes the material in the tablets press be heated to 50～70 ℃, and the add-on of dilute sulphuric acid and synthetic ammonia is as the criterion with control material pH 6.0～6.2;
(3), enter through the material of step (2) that drum unit carries out drum granulating, oven dry obtains granular nitrogenous fertilizer work in-process;
(4), described nitrogenous fertilizer work in-process obtain described particle nitrogen fertilizer after sieving.
Gross weight with raw material is a benchmark, and the content of each main ingredient of raw material is respectively: urea 30～40%, ammonium chloride 50～58%, dilute sulphuric acid 2.5～3.0%, 0.8～1.0%.
Raw material also comprises ammonium sulfate 0.8～1.0%, zinc sulfate 0.2～0.4%, and ammonium sulfate and zinc sulfate enter propylhomoserin method tablets press after being mixed together evenly with urea, ammonium chloride in step (1).
Raw material can also comprise attapulgite 5.0～8.0%, in step (1), attapulgite is entered propylhomoserin method tablets press after urea, ammonia chloride mix.
Raw material also comprises tensio-active agent 0.1～0.2%, and in step (4), the nitrogenous fertilizer work in-process enter coating machine and film after through screening, films to be meant tensio-active agent is evenly coated on the half-finished particle of nitrogenous fertilizer.
When tensio-active agent is paste, be evenly distributed on the particle surface thereby be injected in the granular layer after the tensio-active agent fusion.
When tensio-active agent is powdery, directly tensio-active agent is applied to particle surface.
In the step (3), oven dry is carried out in dryer, and the inlet temperature of dryer is 110～120 ℃, and temperature out is 60～65 ℃.
In the step (4), the nitrogenous fertilizer work in-process after the oven dry are through one-level cooling back screening, and then enter the cooling of secondary cooling kiln, sieve through the finished product sieve at last that to obtain diameter be 2.5～5.0 millimeters particle nitrogen fertilizer.
Dilute sulphuric acid is the sulfuric acid of massfraction 55～62%, in step (2), the material in the tablets press is heated to 50～60 ℃, and before drum granulating, the feeding water vapor is wetting with material.
Because the technique scheme utilization, the present invention compared with prior art has following advantage:
Urea solvability in dilute sulphuric acid is good, utilize the heat of emitting of dilute sulphuric acid and synthetic ammonia that the material that comprises ammonium chloride is heated in the propylhomoserin reaction process, the control temperature of charge is 50～70 ℃, carries out drum granulating, oven dry, screening and can obtain particle nitrogen fertilizer.This method has been avoided the use of adhesive substance, generates ammonium sulfate behind dilute sulphuric acid and the ammonia react, the content height of nitrogen in the nitrogenous fertilizer; Adopt the particulate water content low (smaller or equal to 1.2%) of this method preparation.
Embodiment
Below the specific embodiment of the present invention is described:
According to the preparation method of the particle nitrogen fertilizer of present embodiment, be benchmark with the gross weight of raw material, the prescription of raw material is:
Urea 35%, ammonium chloride 55%, dilute sulphuric acid 2.5%, synthetic ammonia 0.9%, ammonium sulfate 0.9%, zinc sulfate 0.3%, attapulgite 5%, intelligent peptide 0.2% and tensio-active agent 0.2%.
Wherein, one or more the combination that consists of lubricating oil, Microcrystalline Wax, stearylamine, stearylamide of tensio-active agent.The concentration of dilute sulphuric acid is 62% (quality percentage composition).
The preparation method of particle nitrogen fertilizer in turn includes the following steps:
(1), after being mixed by formula rate, urea, ammonium chloride, zinc sulfate, attapulgite, intelligent peptide enter propylhomoserin method tablets press;
(2), dilute sulphuric acid and the synthetic ammonia that feeds formula rate in described tablets press carries out the propylhomoserin reaction, the heat that utilizes described propylhomoserin exothermic heat of reaction to provide makes the material in the tablets press be heated to 50～60 ℃, and the pH 6.0～6.2 of control material feeds small amount of steam then so that material is wetting;
(3), entering drum unit through the material of step (2) carries out drum granulating, enters drying machine drying and obtain granular nitrogenous fertilizer work in-process; The inlet temperature of dryer is 110～120 ℃, and temperature out is 60～65 ℃;
(4), the nitrogenous fertilizer work in-process are through one-level cooling back screening, and then enter the cooling of secondary cooling kiln, pass through finished product sieve the particle of 2.5～4.75 millimeters of diameters, send these particles to coating machine, will spray in the granular layer after the tensio-active agent fusion.
Preparation method of the present invention has following features: the dissolubility of urea in dilute sulfuric acid is good, and the propylhomoserin reaction provides amount of heat when generating ammonium sulfate, effectively lowers the water content in the ammonium chloride; The moisture content of the particle nitrogen fertilizer of making is low, can be controlled in 1.2%.
Claims (6)
1. the preparation method of a particle nitrogen fertilizer, the raw material of particle nitrogen fertilizer mainly is made up of urea, ammonium chloride, dilute sulphuric acid and synthetic ammonia, it is characterized in that: the gross weight with described raw material is a benchmark, consisting of of described raw material: urea 30～40%, ammonium chloride 50～58%, dilute sulphuric acid 2.5～3.0%, synthetic ammonia 0.8～1.0%, ammonium sulfate 0.8～1.0%, zinc sulfate 0.2～0.4%, attapulgite 5.0～8.0%, tensio-active agent 0.1～0.2%, the preparation method of described particle nitrogen fertilizer comprises the steps:
(1), after being mixed, urea, ammonium chloride, ammonium sulfate, zinc sulfate and attapulgite enter propylhomoserin method tablets press;
(2), in described tablets press, feed dilute sulphuric acid and synthetic ammonia and carry out the propylhomoserin reaction, the heat that utilizes described propylhomoserin exothermic heat of reaction to provide makes the material in the tablets press be heated to 50～70 ℃, and the add-on of dilute sulphuric acid and synthetic ammonia is as the criterion with control material pH 6.0～6.2;
(3), enter through the material of step (2) that drum unit carries out drum granulating, oven dry obtains granular nitrogenous fertilizer work in-process;
(4), described nitrogenous fertilizer work in-process enter coating machine after through screening and film and obtain described particle nitrogen fertilizer, described filming is meant tensio-active agent is evenly coated on the half-finished particle of nitrogenous fertilizer.
2. the preparation method of particle nitrogen fertilizer according to claim 1, it is characterized in that: described tensio-active agent is a paste, is evenly distributed on the particle surface thereby be injected in the granular layer after the tensio-active agent fusion.
3. the preparation method of particle nitrogen fertilizer according to claim 1, it is characterized in that: described tensio-active agent is a powdery, directly tensio-active agent is applied to particle surface.
4. the preparation method of particle nitrogen fertilizer according to claim 1, it is characterized in that: in the step (3), described oven dry is carried out in dryer, and the inlet temperature of dryer is 110～120 ℃, and temperature out is 60～65 ℃.
5. the preparation method of particle nitrogen fertilizer according to claim 1, it is characterized in that: in the step (4), nitrogenous fertilizer work in-process after the oven dry are through one-level cooling back screening, and then enter the cooling of secondary cooling kiln, sieve through the finished product sieve at last that to obtain diameter be 2.5～5.0 millimeters particle nitrogen fertilizer.
6. the preparation method of particle nitrogen fertilizer according to claim 1; it is characterized in that: described dilute sulphuric acid is the sulfuric acid of massfraction 55～62%, in step (2), the described material in the tablets press is heated to 50～60 ℃; and before drum granulating, the feeding water vapor is wetting with material.
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| CN2008100236998A CN101265128B (en) | 2008-04-16 | 2008-04-16 | Method for preparing particle nitrogen fertilizer |
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| CN2008100236998A CN101265128B (en) | 2008-04-16 | 2008-04-16 | Method for preparing particle nitrogen fertilizer |
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| CN101265128B true CN101265128B (en) | 2010-08-04 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102617244A (en) * | 2012-04-16 | 2012-08-01 | 瓮福（集团）有限责任公司 | Production formula and preparation method of particle thiamine nitrogenous fertilizer |
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| CN101921149B (en) * | 2010-08-24 | 2013-08-07 | 中盐安徽红四方股份有限公司 | Filler-free synergistic compound fertilizer produced by urine syrup ammonia-acid method and production method thereof |
| WO2012065214A1 (en) * | 2010-11-15 | 2012-05-24 | Csbp Limited | A fertiliser composition containing a plant nutrient and method for producing it |
| CN102336599B (en) * | 2011-06-23 | 2013-11-06 | 安徽省司尔特肥业股份有限公司 | Technological method for producing high-density composite fertilizer by ammonia-acid method |
| CN102503636A (en) * | 2011-10-27 | 2012-06-20 | 山西师范大学 | Ammonium chloride agglomerating prilling method |
| CN102503634A (en) * | 2011-10-27 | 2012-06-20 | 山西师范大学 | Urea-base compound fertilizer production technique |
| CN102617243A (en) * | 2012-04-16 | 2012-08-01 | 瓮福（集团）有限责任公司 | Production formula of granular chloramine nitrogen fertilizer and preparation method thereof |
| CN103232293B (en) * | 2013-05-07 | 2016-06-15 | 嘉施利（应城）化肥有限公司 | Compound fertilizer of high concentration and production method thereof |
| CN104973918A (en) * | 2014-04-11 | 2015-10-14 | 江苏华昌化工（涟水）有限公司 | Urea ammonium composite nitrogen fertilizer and preparation method thereof |
| CN105237155A (en) * | 2015-09-01 | 2016-01-13 | 辽宁施壮肥业有限公司 | Humic acid chelated bio-ecological composite fertilizer and preparation method of same |
| CN108314525A (en) * | 2018-03-14 | 2018-07-24 | 湖北祥云(集团)化工股份有限公司 | A kind of microorganism sustained slow-release fertilizer and preparation method thereof for wheat |
| CN115088450A (en) * | 2022-07-01 | 2022-09-23 | 湖北省农业科学院粮食作物研究所 | Nutrient-consumption-saving vigorous-root senescence-inhibiting fertilizing method for rice |
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| CN1024274C (en) * | 1989-03-30 | 1994-04-20 | 王长山 | Compound fertilizer by spray granulating and preparation thereof |
| CN1225352A (en) * | 1998-12-31 | 1999-08-11 | 陈胜钧 | Long lasting full elements composite fertilizer |
| CN1453248A (en) * | 2002-04-23 | 2003-11-05 | 中国石油化工股份有限公司巴陵分公司 | High-nitrogen urine-based medium-concentration composite fertilizer and its production process |
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2008
- 2008-04-16 CN CN2008100236998A patent/CN101265128B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1024274C (en) * | 1989-03-30 | 1994-04-20 | 王长山 | Compound fertilizer by spray granulating and preparation thereof |
| CN1225352A (en) * | 1998-12-31 | 1999-08-11 | 陈胜钧 | Long lasting full elements composite fertilizer |
| CN1453248A (en) * | 2002-04-23 | 2003-11-05 | 中国石油化工股份有限公司巴陵分公司 | High-nitrogen urine-based medium-concentration composite fertilizer and its production process |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102617244A (en) * | 2012-04-16 | 2012-08-01 | 瓮福（集团）有限责任公司 | Production formula and preparation method of particle thiamine nitrogenous fertilizer |
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