CN101555180A - Preparation method of multi-nutrition slow-release urea - Google Patents
Preparation method of multi-nutrition slow-release urea Download PDFInfo
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- CN101555180A CN101555180A CNA2009101025734A CN200910102573A CN101555180A CN 101555180 A CN101555180 A CN 101555180A CN A2009101025734 A CNA2009101025734 A CN A2009101025734A CN 200910102573 A CN200910102573 A CN 200910102573A CN 101555180 A CN101555180 A CN 101555180A
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Abstract
The invention relates to a preparation method of multi-nutrition slow-release urea, which belongs to the technical field of production in the chemistry industry. The preparation method comprises the steps of wrapping and coating large-grain urea and K-Ca fertilizer in a wrapping machine to form coated urea which takes the large-grain urea as an inner core and the K-Ca fertilizer as an outer film, and then screening, drying and packaging the grains coming out from a coating machine to obtain finished products. The preparation method has the advantages of simple product production technique, comprehensive nutrition, long fertilizer effect and high utilization rate of nitrogen; moreover, the outer film is a citric solubility fertilizer.
Description
Technical field:
The present invention relates to a kind of preparation method of multi-nutrition slow-release urea, belong to chemical production technical field.
Background technology:
Urea, molecular formula CO (NH
2)
2Contain N44～46%, urea is because of the nitrogen content height, and the nitrogen of high density can destroy protein structure, also will dilute or ooze sand sometimes as seed manure; Nitrogen in the urea can not directly be absorbed by plant, and in soil, transform the generation ammonium ion through the effect of urease could be absorbed by crop:
Urea is soluble in water, is easily run off by rain drop erosion, in order to improve the fertilizer efficiency of urea, urea is made granulated, and big granular using can make fertilizer efficiency lengthening, loss few, but acts on limitedly, and commonly used is that urea is made coated slow release fertilizer at present.
Since going out first slow release fertilizer by urea production, existing multiple commodity slow-release carbamide comes out, and being applied in of they promotes the plant growth aspect to play vital role.The method of producing this class fertilizer is also a lot.Do following classification according to its production and slowly-releasing principle: (1) restriction dissolving class slow-release carbamide comprises that granular urea, the slow-release carbamide that adds the molten class material of resistance, surface-coating apply urea.(2) suppress to decompose the class slow-release carbamide, comprise slow-release fertilizer, the slow-release fertilizer that adds nitrification inhibitor that adds the urease inhibitor, the slow-release fertilizer that adds urease inhibitor and nitrification inhibitor.(3) the class slow-release carbamide is decomposed in restriction dissolving and inhibition.
In the used coated fertilizer of surface-coated coating organic/inorganic substance as: sulphur, silicate cement, silicon ester, magnesium ammonium phosphate, calcium phosphate and other phosphoric acid salt, calcium sulfate, naphthenate, castor oil, make coated fertilizer; Organism such as wax are arranged, pitch, Viscotrol C, rosin is made coated fertilizer, also useful polymkeric substance, and increasing with polymkeric substance, the exhausted polymkeric substance has at present: polyurethane(s), organosilicon polymer, Precondensed UreaFormaldehyde Resin, the condenses of urea one phenol one Dyhard RU 100, melamine, epoxy polyester, polystyrene, polyethylene, polymeric amide, polyacrylonitrile, vinyl chloride-vinyl acetate copolymer, natural gum, latex, poly-two piperidino-(1-position only) phosphine piperazines, poly-diphenoxy phosphazine, polyethylene-Synolac, polyvinyl chloride, polyvinyl alcohol, the multipolymer of dicyclopentadiene and ethylene glycol, Vinyl Acetate Copolymer, the poly-glucosamine gel, tens of kinds of synthetic rubber etc.Except above-mentioned coated fertilizer, the somebody uses waste in other Industrial processes to make coated fertilizer.As use the hydrocarbon resin of coal tar distillation product, and the molten-bath residue is made tensio-active agent in the synthetic fatty acid process, and the petroleum distillation residue is made the coating main material.
From as can be known above-mentioned, exhausted most coated fertilizer all be no fertilizer efficiency even many be that environment is had certain contamination.
Potash-lime fertilizer is to pulverize the solubility in citric acid fertilizer that obtains together by potassium felspar sand and Wingdale behind high temperature sintering, usually contain effective potassium oxide 4～8.5%, contain effective calcium oxide 20～30% the efficient oxidation silicon 20～30%, the efficient oxidation magnesium 1～2%, total efficiency about 72% is though potash-lime fertilizer contains potassium, but content is lower, though it is very high to contain effective CaO and MgO, mainly be used in happiness calcium happiness silicon crop such as paddy rice, rape, sweet potato, broad bean and pea etc., restricted application.Potash-lime fertilizer is a kind of Powdered fertilizer, uses very inconveniently, because the solubleness of potash-lime fertilizer in water is very low, result of use is not obvious in a short time, though be fertilizer, people are difficult for accepting.Also be difficult for selling.
From as can be known above-mentioned, do urea coatedly with potash-lime fertilizer, can reach mutual supplement with each other's advantages, potash-lime fertilizer can make urea dilution slowly-releasing, prevents that urea runs off, and replenishes the unicity of urea efficiency, and urea can make the effective SiO of the efficient oxidation potassium of potash-lime fertilizer
2Play one's part to the full with CaO, and opened up new approach for the production and sales of potash-lime fertilizer.
The present invention uses the peplos material of a kind of solubility in citric acid fertilizer potash-lime fertilizer as slow-release carbamide, has not only played the slow release effect of urea, and owing to contain citric soluble potassium, silicon, calcium in the potash-lime fertilizer, has also played the effect of fertilizer many nutrientizations.
Summary of the invention:
Purpose of the present invention is solubility in citric acid fertilizer potash-lime fertilizer and urea are combined the production multi-nutrition slow-release urea.When utilizing potash-lime fertilizer that urea is played coating effect and diluting effect, make full use of the solubility in citric acid of potash-lime fertilizer and effective potassium, silicon, the calcium nutritive element that contains, overcome the no fertilizer efficiency of coated fertilizer in the existing coated carbamide production method simultaneously and the pollution of environment is also opened up new approach for effective utilization of potash-lime fertilizer.
Still there is not at present method and the technology of utilizing potash-lime fertilizer to make urea coated material produce multi-nutrition slow-release urea.
The key that reaches potash-lime fertilizer coating granular urea is that can potash-lime fertilizer coated granule urea, evidence, water can be used as caking agent a material urea and potash-lime fertilizer is sticked together, if be dissolved with a spot of sulfuric acid or other water miscible tackiness agent in water, effect can be better.
The present invention is achieved like this: with granular urea and potash-lime fertilizer in packing machine is that caking agent wraps up and filming with the caking agent, formation is kernel with the granular urea, with the potash-lime fertilizer is the coated carbamide of adventitia, and the particle that is come out by packing machine is packaged as finished product after screening, drying.
The used granular urea of the present invention is meant the granular urea of urea size at φ 3mm-φ 4mm.
The used potash-lime fertilizer of the present invention is meant with potassium felspar sand and contains the citric soluble K that contains usually with Wingdale through what high temperature sintering obtained
2O 4～8.5%, CaO 20～30% and SiO
220～30% fertilizer.
The used potash-lime fertilizer of the present invention needs levigate to 120 orders (tail over≤5%).
Caking agent of the present invention is sprayed onto on the material curtain that urea granules forms in the packing machine with atomizing state.
The fresh urea of the present invention and small-particle, fine powder through sieving are entering pre-mixing before the packing machine, and compound enters packing machine again.
The proportioning of granular urea of the present invention and potash-lime fertilizer is 100 by mass ratio: 40--55.
Finished product granularity of the present invention is at φ 3.5mm-φ 4.5mm.
The present invention has following feature and beneficial effect:
(1) applying the slow-release carbamide production method with existing coating compares, existing coating applies the used coated fertilizer of slow-release carbamide production method, and some does not only have the fertilizer efficiency feature, and environment there is certain contamination, the present invention makes coated fertilizer with potash-lime fertilizer, both play slow releasing function, contained nutritive elements such as effective potassium, silicon, calcium in the potash-lime fertilizer simultaneously; (2) owing to contain a spot of Dicalcium Phosphate (Feed Grade) 2CaOSiO in the potash-lime fertilizer
2, can increase the ultimate compression strength that coating can grain, and make the unlikely chance water of coated granule with regard to disintegration; (3) the present invention has utilized potash-lime fertilizer as coated fertilizer, for the low-analysis fertilizer potash-lime fertilizer with potassium felspar sand production has found outlet, powdered potassium calcareous fertilisers fertilizer is changed into granular, has solved powdered potassium calcareous fertilisers fertilisings problem of difficult; (4) slow-release carbamide of the present invention's preparation is specially adapted to acid soils such as rice field owing to contain the alkaline fertilizer potash-lime fertilizer, and soil improvement is had good action.
Embodiment:
Embodiment 1:
Raw material 1: potash-lime fertilizer, collecting location: Guizhou Xiyang Fertilizer Industry Co., Ltd.'s self-control
Effective chemical constitution of potash-lime fertilizer sees the following form
Raw material 2: granular urea (content 46%), collecting location: Guizhou Xiyang Fertilizer Industry Co., Ltd.
Implementation method:
Granular urea and grinding are crossed in the 120 purpose potash-lime fertilizers adding pre-mixing stirring conveyor, by the mass ratio of granular urea and potash-lime fertilizer is to carry out proportioning at 100: 50, compound wraps up in packing machine and filming, caking agent nebulizes and is sprayed onto on the interior urea granules of packing machine, wetting urea granules and powdered potassium calcareous fertilisers wrap up granulation in packing machine, control adds bonding dosage at about 5% of total material, the material that comes out from packing machine sieves through roller screen, particulate and fine powder return the pre-mixing stirring conveyor, the circulation parcel is filmed, macrobead enters the roller dryer concurrent drying, 120 ℃ of control dry-heat air temperature, dried tail gas is gathered dust by bag filter and dust precipitator, and collected dust retrieval system is used, and material is packed after cooling off and is finished product.
Result of implementation:
Multi-nutrition slow-release urea
Zhi Bei multi-nutrition slow-release urea effective constituent and physical and chemical index is as follows after testing:
The slowly-releasing index: the stripping phase is 25 days in the 80%N water
As from the foregoing, the multi-nutrition slow-release urea for preparing by industrial test contains useful nutritive elements such as solubility in citric acid potassium, silicon, calcium, and sustained release performance is good.
Embodiment: embodiment 2:
Raw material 1: potash-lime fertilizer, collecting location: Guizhou Xiyang Fertilizer Industry Co., Ltd.'s self-control
Effective chemical constitution of potash-lime fertilizer sees the following form
Raw material 2: granular urea (content 46%), collecting location: Guizhou Xiyang Fertilizer Industry Co., Ltd.
Implementation method:
Granular urea and grinding are crossed in the 120 purpose potash-lime fertilizers adding pre-mixing stirring conveyor, by the mass ratio of granular urea and potash-lime fertilizer is to carry out proportioning at 100: 40, compound wraps up in packing machine and filming, caking agent nebulizes and is sprayed onto on the interior urea granules of packing machine, wetting urea granules and powdered potassium calcareous fertilisers wrap up granulation in packing machine, control adds bonding dosage at about 5% of total material, the material that comes out from packing machine sieves through roller screen, particulate and fine powder return the pre-mixing stirring conveyor, the circulation parcel is filmed, macrobead enters the roller dryer concurrent drying, 120 ℃ of control dry-heat air temperature, dried tail gas is gathered dust by bag filter and dust precipitator, and collected dust retrieval system is used, and material is packed after cooling off and is finished product.
Result of implementation:
Multi-nutrition slow-release urea
Zhi Bei multi-nutrition slow-release urea effective constituent and physical and chemical index is as follows after testing:
The slowly-releasing index: the stripping phase is 22 days in the 80%N water
As from the foregoing, the multi-nutrition slow-release urea for preparing by industrial test contains useful nutritive elements such as solubility in citric acid potassium, silicon, calcium, and sustained release performance is good.
Claims (9)
1. the preparation method of a multi-nutrition slow-release urea, it is characterized in that with granular urea and potash-lime fertilizer being that caking agent wraps up and filming with hot water in packing machine, formation is kernel with the granular urea, with the potash-lime fertilizer is the coated carbamide of adventitia, and the particle that is come out by packing machine is packaged as finished product after screening, drying.
2. the preparation method of a kind of multi-nutrition slow-release urea according to claim 1 is characterized in that granular urea is meant the granular urea of granularity at φ 3mm-φ 4mm.
3. according to the preparation method of the described a kind of multi-nutrition slow-release urea of claim 1, it is characterized in that potash-lime fertilizer is meant the solubility in citric acid fertilizer that obtains through high temperature sintering with Wingdale with potassium felspar sand, contains effective K
2O4～8.5%, effective CaO 20～30% effective SiO
220～30%.
4. according to the preparation method of claim 1 or 2 or 3 described a kind of multi-nutrition slow-release ureas, it is characterized in that caking agent is sprayed onto on the material curtain that urea granules forms in the packing machine with atomizing state.
5. the preparation method of a kind of multi-nutrition slow-release urea according to claim 4 is characterized in that fresh urea and small-particle, fine powder through sieving are entering pre-mixing before the packing machine, and compound enters packing machine again.
6. according to the preparation method of claim 1 or 2 or 3 described a kind of multi-nutrition slow-release ureas, it is characterized in that the proportioning of granular urea and potash-lime fertilizer is 100 by mass ratio: 40--55.
7. the preparation method of a kind of multi-nutrition slow-release urea according to claim 1 is characterized in that the finished product granularity is at φ 3.5mm-φ 4.5mm.
8. the preparation method of a kind of multi-nutrition slow-release urea according to claim 3, it is levigate to 120 orders (tail over≤5%) to it is characterized in that potash-lime fertilizer needs.
9. the preparation method of a kind of multi-nutrition slow-release urea according to claim 1 is characterized in that caking agent comprises water-soluble extremely rare sulfuric acid and water-sol stick.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2009101025734A CN101555180A (en) | 2009-05-20 | 2009-05-20 | Preparation method of multi-nutrition slow-release urea |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2009101025734A CN101555180A (en) | 2009-05-20 | 2009-05-20 | Preparation method of multi-nutrition slow-release urea |
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| CN101555180A true CN101555180A (en) | 2009-10-14 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103823018A (en) * | 2014-02-24 | 2014-05-28 | 中国农业科学院农业资源与农业区划研究所 | Method for detecting slow releasing effect of urea in fertilizer, and its use |
| CN104108977A (en) * | 2013-04-18 | 2014-10-22 | 云中英 | Producing process of sulfur-coated urea sustained and controlled release synergistic fertilizer |
| CN106747920A (en) * | 2016-11-22 | 2017-05-31 | 成都锦汇科技有限公司 | A kind of coated slow-release compound fertilizer |
| CN108033833A (en) * | 2017-12-04 | 2018-05-15 | 贵阳开磷化肥有限公司 | A kind of humic acid water-soluble fertilizer of anti-urea solution |
-
2009
- 2009-05-20 CN CNA2009101025734A patent/CN101555180A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104108977A (en) * | 2013-04-18 | 2014-10-22 | 云中英 | Producing process of sulfur-coated urea sustained and controlled release synergistic fertilizer |
| CN103823018A (en) * | 2014-02-24 | 2014-05-28 | 中国农业科学院农业资源与农业区划研究所 | Method for detecting slow releasing effect of urea in fertilizer, and its use |
| CN103823018B (en) * | 2014-02-24 | 2015-09-02 | 中国农业科学院农业资源与农业区划研究所 | Slow released urea detection method and its purposes in a kind of fertilizer |
| CN106747920A (en) * | 2016-11-22 | 2017-05-31 | 成都锦汇科技有限公司 | A kind of coated slow-release compound fertilizer |
| CN108033833A (en) * | 2017-12-04 | 2018-05-15 | 贵阳开磷化肥有限公司 | A kind of humic acid water-soluble fertilizer of anti-urea solution |
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Open date: 20091014 |