CN101037365A - Production technique of carbamide microelement fertilizer - Google Patents
Production technique of carbamide microelement fertilizer Download PDFInfo
- Publication number
- CN101037365A CN101037365A CN 200710048730 CN200710048730A CN101037365A CN 101037365 A CN101037365 A CN 101037365A CN 200710048730 CN200710048730 CN 200710048730 CN 200710048730 A CN200710048730 A CN 200710048730A CN 101037365 A CN101037365 A CN 101037365A
- Authority
- CN
- China
- Prior art keywords
- bed
- fluidized
- sulfate
- zinc
- feed liquid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Abstract
The invention discloses a technics for producing an urea microelement fertilizer, including following steps: (1) adding the material containing microelement into a feed-liquid mixed groove by filling system measurement and mixing it with urea to achieve the feed liquid with a concentration of 75-99.7%; (2) prilling by transmitting the feed-liquid to the pelletizer or prilling tower from the feed-liquid pump, and directly feeding the small particle inoculating crystal or complex fertilizer small particle inoculating crystal to the fluidized bed, and fluidified by the air feeding into the fluidized bed by the air blower, and importing the feed-liquid into the fluidized bed, atomizing or sprinkling by atomizer or rotating nozzle, coating and prilling to the small particle inoculating crystal in the fluidized bed, with a weight ratio of the small particle inoculating crystal to feed-liquid of 0.1-2.0; (3) screening the material at the oscillating screen cooled by a cooling section of the fluidized bed, packing the finished product whose diameter is sized up.
Description
Technical field
The present invention relates to a kind of production technique of carbamide microelement fertilizer.
Background technology
Farm crop are in the normal growth growth course, except needs nitrogen, phosphorus, potassium element fertilizer, also need some trace element fertilizers, lack any trace element, crop will show corresponding nutritional deficiency disease from profile, cause corps diseases to take place and the resistance reduction, and then influence quality and the quality of farm crop.For farm crop, content is called " trace element " between the essential nutrient element of 0.2～200 milligram/kilogram (by dry restatement).Although crop to its requirement seldom, they are integral parts of plant body endoenzyme, coenzyme, participate in most of physiological activities, have very strong specificity, are that the crop normal growth is grown indispensable and irreplaceable element.Up to the present, by the world, generally acknowledged trace element seven kinds of zinc (Zn), boron (B), manganese (Mn), molybdenum (Mo), copper (Cu), iron (Fe), chlorine (CL) etc. are arranged.
And the method for tradition interpolation trace element has mechanical blending method technology and fusion complexometry technology etc., (publication number is CN85102658 as the Chinese patent by Luzhou natural gas chemical plant (applicant's former name) and Sichuan University's co-applications, name is called the synthetic method that complexing fertilizer three nitric acid six urea close iron III) disclose and a kind of urea and zinc sulfate, ferric sulfate or zinc nitrate have been dissolved into solution, heating is reacted, and generates powdery complexing zinc through evaporating, concentrating and crystallizing again.This method also has weak point: 1. technical process is long, complicated operation, production poor continuity; 2. the separation of complex compound evaporation is comparatively difficult, the energy consumption height; 3. facility investment expense height, factory building takes up an area of many; 4. product is the powdery crystallization, and caking is used inconvenience easily.
Summary of the invention
The technical problem to be solved in the present invention is the production technique how a kind of carbamide microelement fertilizer is provided, this technology can combine with the existing urea production technique, Production Flow Chart weak point, low equipment investment, energy consumption is low, product appearance good, and can be according to the farm crop demand, specific aim is adjusted the kind and the concentration of contained trace element in the product.
The technical problem that proposes of the present invention is to solve like this: a kind of production technique of carbamide microelement fertilizer is provided, it is characterized in that, comprise following steps:
(1), will contain trace element materials and add the feed liquid tempering tank by the metered charge system, with urea mixed feed liquid, feed concentration is 75～99.7%;
(2), feed liquid is delivered to by feed pump carried out granulation in tablets press or the prilling tower, and directly send the small-particle crystal seed or the composite fertilizer's small-particle crystal seed that generate to fluidized-bed, sent to the air fluidisation of fluidized-bed by blower fan, simultaneously also feed liquid is directly introduced fluidized-bed, atomize or spray by atomizer or rotary nozzle, small-particle crystal seed in the fluidized-bed is carried out coating pelletizing, and the weight ratio of small-particle crystal seed and feed liquid is between 0.1～2.0;
(3) deliver to vibratory screening apparatus through fluidized-bed cooling section refrigerative material and sieve, fine particle directly returns fluidized-bed as the small-particle crystal seed, and particle diameter is satisfactory sends to packing as finished product.
Production technique according to carbamide microelement fertilizer provided by the present invention is characterized in that, the described trace element that contains in the trace element materials is to contain in zinc, boron, manganese, molybdenum, copper, the iron one or more, and the raw material that contains trace element is:
(1), zinc: one or more in zinc sulfate, zinc oxide, zinc chloride, zinc nitrate, basic zinc sulfate, the zinc subcarbonate etc.;
(2), boron: in sodium tetraborate (borax, month stone sand), the boric acid one or more;
(3), manganese: one or more in manganous sulfate, manganese oxide, manganous carbonate, Manganous chloride tetrahydrate, ammonium sulfate manganese, the manganous nitrate etc.;
(4), molybdenum: one or more in ammonium molybdate, Sodium orthomolybdate, the molybdic oxide etc.;
(5), copper: one or more in copper sulfate, cupric oxide, Red copper oxide, the Basic Chrome Sulphate etc.;
(6), iron: one or more in ferric sulfate, ferrous sulfate, the iron nitrate etc.
Production technique according to carbamide microelement fertilizer provided by the present invention is characterized in that, the fluidization air that fluidized-bed is included dust is delivered to washing tower through induced draft fan, with the washing of following of recycle pump, reaches after the set quota again through the induced draft fan air defense; Circulating cleaning solution branches to vapo(u)rization system after reaching finite concentration.
Production technique according to carbamide microelement fertilizer provided by the present invention, it is characterized in that in step (2), tablets press can be fluidized bed pelletizer or tumbling disk granulator or rotary drum granulator, this moment, feed liquid atomized by atomizer, and small-particle crystal seed in the bed is carried out coating pelletizing; When adopting the prilling tower granulation, slip is delivered to rotary nozzle and is carried out sprinkling pelleting.
Production technique according to carbamide microelement fertilizer provided by the present invention is characterized in that, described feed liquid can be made by one of following dual mode:
(1), contain one or more and solid urea in the raw material of elements such as Zn, B, Mn, Mo, Cu, Fe and carry out misciblely, obtaining moisture content is 0.3～25%, trace element materials content is 1～10%, the mixed liquor of urea concentration 65～98.7%;
(2) raw material that contains elements such as Zn, B, Mn, Mo, Cu, Fe directly joins from carrying out in the urine of apparatus for urea synthesis misciblely, and obtaining water content is 0.3～25%, and micronutrient levels is 1～10%, and urea content is 65～98.7% mixed liquor.
Production technique according to carbamide microelement fertilizer provided by the present invention is characterized in that, can add in pigment, nitrification inhibitor, urease inhibitor, the anti-hard caking agent one or more in the described feed liquid; Described pigment is phthalocyanine series or oily molten serial pigment; Described nitrification inhibitor is one or more in thiocarbamide, two cyanogen ammonium, Sulphathiazole, the 2-amino-4 chloro-6-methylpyrimidine; The composition that urase suppresses is one or more in Sodium Tetraborate, ferrous sulfate, copper sulfate, ammonium molybdate, manganous sulfate, zinc sulfate, rare earth nitrate or the quinhydrones; Anti-hard caking agent can be one or more in alkylbenzene sulfonate polyacrylic acid, polyoxyethylene glycol, polyvinyl alcohol, Precondensed UreaFormaldehyde Resin and derivative thereof, polyalkylene glycol and the derivative thereof.
Production technique according to carbamide microelement fertilizer provided by the present invention is characterized in that, described fluidized-bed can be that described fluidized-bed can be a kind of in spouted fluidized bed, rotary drum fluid-bed, the vibrated fluidized bed.
Production technique according to carbamide microelement fertilizer provided by the present invention is characterized in that, the atomizing type of described feed liquid can adopt fluid pressure type or air pressure type.
The present invention compares with fusion complexometry technology with mechanical blending method technology, and its advantage is:
(1) technological process of production is short, and technological operation is convenient;
(2) product is a spheroidal particle, and outward appearance is good, and agglomeration preventing performance is outstanding;
(3) product content is even, the legal segregation phenomena that can't overcome of mechanical blending can not occur.
Description of drawings
Fig. 1 is process flow sheet provided by the present invention (is example with the fluidized bed pelletizer)
Wherein, 1, feed liquid tempering tank; 2, micro-metered charge system; 3, feed pump; 4, blower fan; 5, fluidized-bed; 6, vibratory screening apparatus; 7, washing tower; 8, recycle pump.
Embodiment
The present invention is described in detail below in conjunction with accompanying drawing.
Process program of the present invention is: contain trace element materials and add feed liquid tempering tank 1 by metered charge system 2, with the miscible feed liquid that makes of urea, this feed liquid is transported to fluidized bed pelletizer by feed pump 3, in fluidized bed pelletizer, the small-particle raw material is directly sent fluidized-bed 5 to, sent to the air fluidisation of fluidized-bed 5 by blower fan 4, feed liquid is introduced fluidized-bed simultaneously, is sprayed on repeatedly on the small-particle that is in the fluidized state after the shower nozzle atomizing; At fluidized-bed 5 back segments cooling section is set; The discharging of fluidized-bed 5 is delivered to vibratory screening apparatus 6 and is sieved, and fine particle returns fluidized-bed 5 as crystal seed, and what meet the particle diameter requirement sends to packing as finished product.The fluidization air that contains dust is delivered to washing tower 6, carries out circulation cleaning with recycle pump 8, reaches emptying after the set quota, and circulating cleaning solution branches to vapo(u)rization system after reaching finite concentration.The metered charge system can be the vibrations hopper in conjunction with weigh belt, also can be spiral metered charge scale, weightless charging system etc.
Feed liquid in this technology is the fused solution that urea obtains through fusion, perhaps generate solution for synthesizer, when crystal seed is urea, feed liquid is a urea soln, its concentration can be controlled in 75～99.7%, optimum is 85～98.5%, general optional 85% or 98.5% or 90% or 92% or 87% etc.; The atomizing type of general feed liquid can adopt fluid pressure type or air pressure type.
The used tablets press of this technology can be a kind of in fluidized bed pelletizer, rotary drum granulator, tumbling disk granulator or the tower sprinkling pelleting tower, optimum optional fluidized bed pelletizer.The dust that forms in granulation process adopts washing tower to carry out wet dust removal, and washing tower is generally selected packing tower or spray column for use.
In this processing method,, can in feed liquid, add in pro rata pigment, nitrification inhibitor, urease inhibitor, the anti-hard caking agent one or more and carry out mixed melting for improving the functional of product.Above-mentioned pigment composition can be phthalocyanine series or oily molten serial pigment, the composition of nitrification inhibitor is thiocarbamide, two cyanogen ammonium, Sulphathiazole, 2-amino-4 chloro-6-methylpyrimidine, the composition that urase suppresses can be selected from Sodium Tetraborate, ferrous sulfate, copper sulfate, ammonium molybdate, manganous sulfate, zinc sulfate, rare earth nitrate or quinhydrones, and anti-hard caking agent is alkylbenzene sulfonate polyacrylic acid, polyoxyethylene glycol, polyvinyl alcohol, Precondensed UreaFormaldehyde Resin and derivative thereof, polyalkylene glycol and derivative thereof etc.
In processing method, the weight ratio of crystal seed and feed liquid is generally got between 0.5～1.5 0.1～2.0, and the best is 1 or 0.5 or 1.1 or 0.7.
Below be several embodiments of the present invention:
Zinc sulfate with carry out the miscible feed liquid that makes from the urea soln of apparatus for urea synthesis.Urine concentration is not less than 75%, and zinc sulfate adds by the amount that contains zinc 6% in the product.Crystal seed is in fluidized state in fluidized-bed, by regulating fluidization air bed temperature is controlled at 115 ℃.The miscible gained feed liquid of zinc sulfate and urine is introduced fluidized-bed by feed pump, adopts fluid pressure type shower nozzle atomizing back that particle is coated continuously.The weight ratio of crystal seed and urea liquation was controlled at 1: 1.8.Obtain urea-zinc paddy rice specific complex trace element fertilizer.
Zinc sulfate, sodium tetraborate and solid urea carry out mixed melting and make feed liquid.Adding of zinc sulfate, sodium tetraborate by the amount that contains zinc 1.5%, boracic 1% in the little fertilizer product of urea.Be in fluidized state at fluidized-bed small particles urea, bed temperature be controlled at 105 ℃ by regulating fluidization air.By feed pump trace element materials and the miscible gained feed liquid of urea are introduced fluidized-bed, after the shower nozzle atomizing, particle is coated continuously.The weight ratio of crystal seed and urea liquation was controlled at 1: 1.Obtain urea-zinc-boron composite trace element fertilizer.
Zinc oxide, boric acid, manganous sulfate, Basic Chrome Sulphate and urine are carried out the miscible feed liquid that makes.The add-on of zinc oxide, boric acid, manganous sulfate, Basic Chrome Sulphate adds by the amount that contains zinc 1.0%, boracic 1.0% in the little fertilizer product of urea, contains manganese 0.5%, cupric 0.5%.Be in fluidized state at fluidized-bed small particles urea, bed temperature be controlled at 100 ℃ by regulating fluidization air.By feed pump trace element materials and the miscible gained feed liquid of urea are introduced fluidized-bed, after the shower nozzle atomizing, particle is coated continuously.The weight ratio of crystal seed and urea liquation was controlled at 1: 1.Obtain urea-zinc-boron-manganese-copper composite trace element fertilizer.
Zinc sulfate, boric acid, manganous sulfate, copper sulfate, ferric sulfate and urea carry out the miscible feed liquid that makes.The add-on of zinc oxide, boric acid, manganous sulfate, Basic Chrome Sulphate adds by the amount that contains zinc 1.0%, boracic 1.0% in the little fertilizer product of urea, contains manganese 0.5%, cupric 0.5%.Be in fluidized state at fluidized-bed small particles urea, bed temperature be controlled at 110 ℃ by regulating fluidization air.By feed pump trace element materials and urea must be mixed the gained feed liquid and introduce fluidized-bed, after the shower nozzle atomizing, particle be coated continuously.The weight ratio of crystal seed and urea liquation was controlled at 1: 1.Obtain urea-zinc-boron-manganese-copper composite trace element fertilizer.
Zinc nitrate, sodium tetraborate, manganous sulfate, ammonium molybdate, copper sulfate, ferric sulfate and urea carry out the miscible feed liquid that makes.The add-on of zinc oxide, boric acid, manganous sulfate, Basic Chrome Sulphate by contain zinc 1.0%, boracic 1.0% in the little fertilizer product of urea, contain manganese 0.5%, cupric 0.5%, iron content 0.5%, the amount that contains molybdenum 0.5% add.Be in fluidized state at fluidized-bed small particles urea, bed temperature be controlled at 110 ℃ by regulating fluidization air.By feed pump trace element materials and urea must be mixed the gained feed liquid and introduce fluidized-bed, after the shower nozzle atomizing, particle be coated continuously.The weight ratio of crystal seed and urea liquation was controlled at 1: 1.Obtain the polynary composite trace element fertilizer of urea-zinc-boron-manganese-molybdenum-copper-iron.
Claims (8)
1, a kind of production technique of carbamide microelement fertilizer is characterized in that, comprises following steps:
(1), will contain trace element materials and add the feed liquid tempering tank by the metered charge system, with urea mixed feed liquid, feed concentration is 75～99.7%;
(2), feed liquid is delivered to by feed pump carried out granulation in tablets press or the prilling tower, and directly send the small-particle crystal seed or the composite fertilizer's small-particle crystal seed that generate to fluidized-bed, sent to the air fluidisation of fluidized-bed by blower fan, simultaneously also feed liquid is directly introduced fluidized-bed, atomize or spray by atomizer or rotary nozzle, small-particle crystal seed in the fluidized-bed is carried out coating pelletizing, and the weight ratio of small-particle crystal seed and feed liquid is between 0.1～2.0;
(3) deliver to vibratory screening apparatus through fluidized-bed cooling section refrigerative material and sieve, fine particle directly returns fluidized-bed as the small-particle crystal seed, and particle diameter is satisfactory sends to packing as finished product.
2, the production technique of carbamide microelement fertilizer according to claim 1 is characterized in that, the described trace element that contains in the trace element materials is to contain in zinc, boron, manganese, molybdenum, copper, the iron one or more, and the raw material that contains trace element is:
(1), zinc: one or more in zinc sulfate, zinc oxide, zinc chloride, zinc nitrate, basic zinc sulfate, the zinc subcarbonate etc.;
(2), boron: in sodium tetraborate (borax, month stone sand), the boric acid one or more;
(3), manganese: one or more in manganous sulfate, manganese oxide, manganous carbonate, Manganous chloride tetrahydrate, ammonium sulfate manganese, the manganous nitrate etc.;
(4), molybdenum: one or more in ammonium molybdate, Sodium orthomolybdate, the molybdic oxide etc.;
(5), copper: one or more in copper sulfate, cupric oxide, Red copper oxide, the Basic Chrome Sulphate etc.;
(6), iron: one or more in ferric sulfate, ferrous sulfate, the iron nitrate etc.
3, the production technique of carbamide microelement fertilizer according to claim 1 is characterized in that, the fluidization air that fluidized-bed is included dust is delivered to washing tower through induced draft fan, with the washing of following of recycle pump, reaches after the set quota again through the induced draft fan air defense; Circulating cleaning solution branches to vapo(u)rization system after reaching finite concentration.
4, the production technique of carbamide microelement fertilizer according to claim 1, it is characterized in that in step (2), tablets press can be fluidized bed pelletizer or tumbling disk granulator or rotary drum granulator, this moment, feed liquid atomized by atomizer, and small-particle crystal seed in the bed is carried out coating pelletizing; When adopting the prilling tower granulation, slip is delivered to rotary nozzle and is carried out sprinkling pelleting.
5, the production technique of carbamide microelement fertilizer according to claim 1 is characterized in that, described feed liquid can be made by one of following dual mode:
(1), contain one or more and solid urea in the raw material of elements such as Zn, B, Mn, Mo, Cu, Fe and carry out misciblely, obtaining moisture content is 0.3～25%, trace element materials content is 1～10%, the mixed liquor of urea concentration 65～98.7%;
(2) raw material that contains elements such as Zn, B, Mn, Mo, Cu, Fe directly joins from carrying out in the urine of apparatus for urea synthesis misciblely, and obtaining water content is 0.3～25%, and micronutrient levels is 1～10%, and urea content is 65～98.7% mixed liquor.
6, the production technique of carbamide microelement fertilizer according to claim 1 or 5 is characterized in that, can add in pigment, nitrification inhibitor, urease inhibitor, the anti-hard caking agent one or more in the described feed liquid; Described pigment is phthalocyanine series or oily molten serial pigment; Described nitrification inhibitor is one or more in thiocarbamide, two cyanogen ammonium, Sulphathiazole, the 2-amino-4 chloro-6-methylpyrimidine; The composition that urase suppresses is one or more in Sodium Tetraborate, ferrous sulfate, copper sulfate, ammonium molybdate, manganous sulfate, zinc sulfate, rare earth nitrate or the quinhydrones; Anti-hard caking agent can be one or more in alkylbenzene sulfonate polyacrylic acid, polyoxyethylene glycol, polyvinyl alcohol, Precondensed UreaFormaldehyde Resin and derivative thereof, polyalkylene glycol and the derivative thereof.
According to the production technique of the carbamide microelement fertilizer of claim 1, it is characterized in that 7, described fluidized-bed can be that described fluidized-bed can be a kind of in spouted fluidized bed, rotary drum fluid-bed, the vibrated fluidized bed.
8, according to the production technique of the carbamide microelement fertilizer of claim 1, it is characterized in that the atomizing type of described feed liquid can adopt fluid pressure type or air pressure type.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200710048730 CN101037365A (en) | 2007-03-26 | 2007-03-26 | Production technique of carbamide microelement fertilizer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200710048730 CN101037365A (en) | 2007-03-26 | 2007-03-26 | Production technique of carbamide microelement fertilizer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101037365A true CN101037365A (en) | 2007-09-19 |
Family
ID=38888567
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200710048730 Pending CN101037365A (en) | 2007-03-26 | 2007-03-26 | Production technique of carbamide microelement fertilizer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101037365A (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101303146B (en) * | 2008-01-24 | 2010-06-02 | 郑州阿波罗肥业有限公司 | Air cooling process for cooling high tower granulation fertilizer |
| CN102557838A (en) * | 2010-12-30 | 2012-07-11 | 中国科学院沈阳应用生态研究所 | Multi-functional slow-release urea fertilizer and preparation method |
| CN102910954A (en) * | 2012-10-30 | 2013-02-06 | 山东红日阿康化工股份有限公司 | Production method of low-carbon spraying microcrystalline water-soluble fertilizer |
| CN102976857A (en) * | 2012-12-17 | 2013-03-20 | 浙江奥复托化工有限公司 | Synergistic nitrogenous fertilizer and preparation method thereof |
| CN105110819A (en) * | 2015-07-22 | 2015-12-02 | 江苏新世纪江南环保股份有限公司 | Method used for producing sulfur-based urea compound fertilizer from ammonia desulphurization by-products |
| CN106588183A (en) * | 2016-12-02 | 2017-04-26 | 锦西天然气化工有限责任公司 | Production process of boron-nitrogen fertilizer |
| CN108137429A (en) * | 2015-08-12 | 2018-06-08 | 美盛有限公司 | To improve the acid processing of the fertilizer of zinc solubility and utilizability |
| CN108349827A (en) * | 2015-11-12 | 2018-07-31 | 雅苒国际集团 | The improved blend compositions and preparation method thereof based on urea |
| CN111574268A (en) * | 2019-02-15 | 2020-08-25 | 王国芳 | Simple and easy new method for producing compound (mixed) fertilizer directly by urea device |
| CN113195088A (en) * | 2018-12-18 | 2021-07-30 | 斯塔米卡邦有限公司 | Urea granulation equipment |
| US11084762B2 (en) | 2013-08-19 | 2021-08-10 | The Mosaic Company | System and methods for addition of beneficial agricultural, biological, and/or dedusting additives to granular fertilizers |
-
2007
- 2007-03-26 CN CN 200710048730 patent/CN101037365A/en active Pending
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101303146B (en) * | 2008-01-24 | 2010-06-02 | 郑州阿波罗肥业有限公司 | Air cooling process for cooling high tower granulation fertilizer |
| CN102557838A (en) * | 2010-12-30 | 2012-07-11 | 中国科学院沈阳应用生态研究所 | Multi-functional slow-release urea fertilizer and preparation method |
| CN102910954A (en) * | 2012-10-30 | 2013-02-06 | 山东红日阿康化工股份有限公司 | Production method of low-carbon spraying microcrystalline water-soluble fertilizer |
| CN102910954B (en) * | 2012-10-30 | 2014-01-01 | 山东红日阿康化工股份有限公司 | Production method of low-carbon spraying microcrystalline water-soluble fertilizer |
| CN102976857A (en) * | 2012-12-17 | 2013-03-20 | 浙江奥复托化工有限公司 | Synergistic nitrogenous fertilizer and preparation method thereof |
| CN102976857B (en) * | 2012-12-17 | 2015-04-01 | 浙江奥复托化工有限公司 | Synergistic nitrogenous fertilizer and preparation method thereof |
| US11084762B2 (en) | 2013-08-19 | 2021-08-10 | The Mosaic Company | System and methods for addition of beneficial agricultural, biological, and/or dedusting additives to granular fertilizers |
| CN105110819A (en) * | 2015-07-22 | 2015-12-02 | 江苏新世纪江南环保股份有限公司 | Method used for producing sulfur-based urea compound fertilizer from ammonia desulphurization by-products |
| CN108137429A (en) * | 2015-08-12 | 2018-06-08 | 美盛有限公司 | To improve the acid processing of the fertilizer of zinc solubility and utilizability |
| US11807587B2 (en) | 2015-08-12 | 2023-11-07 | The Mosaic Company, Inc. | Acid treatment for fertilizers to increase zinc solubility and availability |
| CN108349827A (en) * | 2015-11-12 | 2018-07-31 | 雅苒国际集团 | The improved blend compositions and preparation method thereof based on urea |
| CN106588183A (en) * | 2016-12-02 | 2017-04-26 | 锦西天然气化工有限责任公司 | Production process of boron-nitrogen fertilizer |
| CN113195088A (en) * | 2018-12-18 | 2021-07-30 | 斯塔米卡邦有限公司 | Urea granulation equipment |
| CN111574268A (en) * | 2019-02-15 | 2020-08-25 | 王国芳 | Simple and easy new method for producing compound (mixed) fertilizer directly by urea device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101037365A (en) | Production technique of carbamide microelement fertilizer | |
| AU750204B2 (en) | Processes for preparing granular composite fertilizer compositions and products produced thereby | |
| EP3579957B1 (en) | Polyhalite granulation process | |
| CN1213964C (en) | Low-tower molten slurry pelletizing method and apparatus to produce granulated multicomponent composite fertilizer | |
| CN101570455B (en) | Method for preparing particle ammonium sulfate product by organic-inorganic binder | |
| CN1213001C (en) | Method of producing granular composite fertilizer using high tower pellatizer and equipment | |
| CN110590439A (en) | High-tower slow-release compound fertilizer and preparation method thereof | |
| CN1209183C (en) | Wet granulation method for generating sulfur granules | |
| CN1403418A (en) | Composite biological fertilizer covered by bacterial material and its production process | |
| CN107986887B (en) | Round high-strength granular potassium chloride fertilizer and manufacturing method thereof | |
| CN1891678A (en) | Method for producing NPK compound-mixed fertilizer using ammonia nitrate as raw material | |
| CN102417426A (en) | Production method of spraying sulfoacid resin type sustained and controlled-release fertilizer | |
| CN1130323C (en) | process for preparing high-concentration granular composite N-K fertilizer | |
| CN102976859A (en) | Production method of large-granule slow-release fertilizer | |
| CN1948242A (en) | Technological method of improving small particle product strength and elliminating product dust | |
| CN1174940C (en) | Process for preparing granular composite N-K fertilizer | |
| CN1260189C (en) | Slowly controlled releasing sulfur-containing urea and its prepn process | |
| CN1130322C (en) | Process for preparing high-concentration granular urine-base composite N-K fertilizer | |
| CN100383091C (en) | Granulating Method in tower type for producing complex fertilizer of nitrogen, phosphor and potass | |
| CN106116850A (en) | The urea-base compound fertilizer that a kind of air prilling produces | |
| CN100430343C (en) | Method of producing granular composite fertilizer using tower pelletizing | |
| CN1293175A (en) | Fluidized gramulating process of heterogeneous urea-base compound fertilizer | |
| CN115427377A (en) | Zinc-coated urea fertilizer | |
| EP1411036B1 (en) | Method of obtaining nitrogenated granular fertilizers with a high microelement content and fertilizers obtained thereby | |
| CA2664116A1 (en) | Process for the continuous granulation of fertilizers |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Open date: 20070919 |