CN1293176A - Process for preparing granular composite N-K fertilizer - Google Patents
Process for preparing granular composite N-K fertilizer Download PDFInfo
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- CN1293176A CN1293176A CN00127679A CN00127679A CN1293176A CN 1293176 A CN1293176 A CN 1293176A CN 00127679 A CN00127679 A CN 00127679A CN 00127679 A CN00127679 A CN 00127679A CN 1293176 A CN1293176 A CN 1293176A
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05C—NITROGENOUS FERTILISERS
- C05C9/00—Fertilisers containing urea or urea compounds
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05D—INORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C; FERTILISERS PRODUCING CARBON DIOXIDE
- C05D1/00—Fertilisers containing potassium
- C05D1/02—Manufacture from potassium chloride or sulfate or double or mixed salts thereof
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
- C05G5/00—Fertilisers characterised by their form
- C05G5/10—Solid or semi-solid fertilisers, e.g. powders
- C05G5/12—Granules or flakes
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
- C05G5/00—Fertilisers characterised by their form
- C05G5/30—Layered or coated, e.g. dust-preventing coatings
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- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Pest Control & Pesticides (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Fertilizers (AREA)
Abstract
A granular mixed N-K fertilizer is prepared through spraying urea solution onto preheated K-fertilizer particles, granulating in a disc granulator, polishing and screening. It features use of disk-type gramulator for higher granulating percentage up to 80% or more. This method can also produce mixed N-K fertilizer containing trace and middle elements.
Description
The present invention relates to a kind of manufacture method of composite fertilizer, relate to a kind of manufacture method of granular composite N-K fertilizer or rather.
Base fertilizer such as urea, general calcium, coarse whiting, phosphorus ammonium, Repone K etc. are carried out secondary processing make the inexorable trend that composite fertilizer is modern fertilizer industry development.Slurry process, granulating method, melting method, extrusion process and blending method etc. are mainly adopted in the production of existing composite fertilizer.To have a technical process simple because of it to adopt the blending method to produce composite fertilizer, production cost is cheap relatively, easy to use, can allocate characteristics such as nitrogen phosphoris and potassium fertilizer ratio arbitrarily according to user and farm crop nutrient demand, usage quantity is very big in fertilizer industry developed country, and the composite fertilizer that the U.S. utilizes the blending method to produce accounts for 75% of usage quantity.The usage quantity of the present bulk blended fertilizer of China is also in cumulative year after year.This method requires each mixing raw material to have approaching grain graininess and severe, and to prevent the classification of fertiliser granulates in transportation and use, the nutrient inequality damages and then influence the yield and quality of farm crop when avoiding applying fertilizer to farm crop.But China goes back the good granulation of fertilizer technology of none now, satisfies the requirement of bulk blended fertilizer to basic material fertilizer.
At present, what the granulation process of China's composite fertilizer was commonly used is granulating method, and adopting the pan-type pelletizer granulation also is one of main mode of pellet granulation.The pan-type pelletizer granulation has following advantage: the grading that (1) is good, granulating rate height; (2) whole intuitive operation can in time be regulated by the operation process; (3) product has bigger handiness, and the granularity span of control is wide; (4) reduced investment.
In prior art, Shanghai Chemical Research Inst discloses a kind of composite fertilizer production technique of fused mass granulating.This technology is directly utilized the urea soln (concentration is 〉=95%) and phosphorus ammonium and Repone K melting mixing of one section of factory that makes urea or dual circulation, adopts sprinkling pelleting to produce nitrogen phosphorus potassium or NK compound fertilizer, the fertiliser granulates rounding that this method is produced, and intensity is big; Particle grain size and severe can satisfy the requirement of bulk blended fertilizer to material fertilizer, but exist prilling spry easily to stop up, and need problems such as often cleaning.
Norway N.H. company once adopted high temperature disk granulation technology that urea, ammonium nitrate, lime ammonium nitrate are carried out the granulation test in the sixties.Granulation process is carrying out near solid fusing point place, and carbamide granulation products obtained therefrom particle diameter is respectively 1.4～4mm, 2～4mm, 4～8mm, and granule strength can reach 20～30 newton.
U.S. TVA also adopts disk granulation that urea, ammonium nitrate, nitre phosphorus ammonium, nitre sulphur ammonium, urine phosphorus ammonium are carried out the granulation test the same period, with N.H. company slightly different to be granulation process operate being lower than under 10 ℃ of fusing points or the lower temperature, products obtained therefrom granularity rounding, the intensity height.
But in above-mentioned two kinds of disk granulation processes, used medium is the fine melt body, does not have other solid material and participates in granulation.
The manufacture method that the purpose of this invention is to provide a kind of granular composite N-K fertilizer.This method organically combines granular urea production and potash fertilizer balling-up technology, can be blending method production NPK compound fertilizer qualified size particles nitrogen-potassium fertilizer is provided, and can avoid the defective that exists in the tower or oil cooling granulation of melt.The compound manure manufacture method of the present invention also nutrient demand of visual crop adds a certain amount of moderate-element compound or trace compound, makes the granular nitrogen-potassium composite fertilizer that contains multi-nutrient element.
For achieving the above object, granular composite N-K fertilizer manufacture method of the present invention comprises the steps:
(1) granularity is heated to 80～110 ℃ less than Repone K or the vitriolate of tartar of 1mm, sends into operating granulating disc,
(2) urea soln of concentration 〉=95% (weight) is sprayed on the moving fine particle fertilizer surface in the granulating disc, granulation,
(3) reach regulation size particles fertilizer and leave tablets press and enter system light tube, the temperature of leaving the granulated fertilizer of tablets press is not less than 80 ℃, and fertiliser granulates is subjected to mechanical force in system light tube effect makes the fertiliser granulates smooth surface,
(4) granulated fertilizer that comes out from system light tube is through screening, and the granulated fertilizer of certain particle size range is qualified granular composite N-K fertilizer after cooling, and the granulated fertilizer of greater particle size after fragmentation and fine powder turn back to together and continue granulation in the granulating disc.
Granular composite N-K fertilizer manufacture method of the present invention, the additional proportion of urea and Repone K are urea: Repone K=(0.8～4): 1 (weight).
The manufacture method of composite fertilizer of the present invention, the disk tilt angle of described granulating disc are 45 °～55 °, and blade diameter length ratio is (8～12): 1.
The manufacture method of composite fertilizer of the present invention, described system light tube are that the inclination angle is 2 °～4 °, the slick rotary drum of operating area.
Though the trace element that farm crop need seldom, the quality that improves crop yield and improve crop is had certain effect.The manufacture method of granular nitrogen-potassium composite fertilizer of the present invention, in urea strong solution and Repone K (or vitriolate of tartar) granulation, also can add a certain amount of moderate-element compound or trace compound, in obtaining containing, the granular nitrogen-potassium composite fertilizer of micronutrient according to the needs of crop or soil.
Moderate-element compound of the present invention is one or more the mixture in calcium cpd, magnesium compound, the sulphur compound, as compounds such as calcium sulfate, nitrocalcite, sal epsom, potassium magnesium sulfate, sulphur; Described trace compound is one or more the mixture in the compounds such as boron compound, copper compound, iron cpd, manganic compound, molybdenum compound, zn cpds, as compounds such as copper sulfate, cupric oxide, ammonium molybdate, Sodium orthomolybdate, boric acid, borax, ferrous sulfate, chelated iron, zinc sulfate, zinc oxide, zinc chloride, manganous sulfate, manganese oxide, Manganous chloride tetrahydrates.
The principle of the manufacture method of granular nitrogen-potassium composite fertilizer of the present invention is: can form the characteristics of common solution according to urea and Repone K, granulation process such as single melt are carried out.Urea condenses in granulation process simultaneously, emits heat of crystallization, makes system can keep higher temperature, and granulation is carried out with coating and agglomerant mode, obtains qualified size particles.
The granulation mode of the manufacture method of granular nitrogen-potassium composite fertilizer of the present invention is a hot melts high temperature disk granulation, and it is low excessively to have solved in the existing disk granulation process prilling temperature, the problem that balling ratio is not high.The potash fertilizer that adopts urea strong solution and preheating is in the granulation of comparatively high temps lower disc, and balling ratio can reach more than 80%, and specific productivity is greatly improved.
The manufacture method of granular nitrogen-potassium composite fertilizer of the present invention is because the raw materials used moisture content of system is very low, and the fertiliser granulates behind the disk granulation is not moisture substantially, so drying-free, and whole production technology has been saved investment and all very high dehumidification system of operating costs.
The manufacture method of granular nitrogen-potassium composite fertilizer of the present invention, equipment is simple, reduced investment, the operation intuitive and convenient is avoided the defective that exists in the tower or oil cooling granulation of melt, is applicable to the needs that medium and small nitrogen fertilizer factory composite fertilizer is produced.
The manufacture method of granular nitrogen-potassium composite fertilizer of the present invention, nitrogen potassium ratio can be adjusted between 1: 2 to 3: 1, had very big handiness.The particle diameter of fertilizer product can be adjusted in very wide scope, can obtain the product of 1.4～4mm, 4～6mm, 6～8mm particle diameter.The product of producing can be used separately, also can satisfy the requirement of bulk blended fertilizer to material fertilizer, carries out blending with the material fertilizer of other nitrogenous phosphorus potassium, makes the nitrogen phosphorus potassium bulk blended fertilizer of various ratios on the spot and uses.
In order to implement the present invention better, the present invention is further illustrated now to enumerate following embodiment, but embodiment is not a limitation of the present invention.
Embodiment 1:
Previously prepared nitrogen potash fertilizer is added in the granulating disc that is rotating by 13.0kg/h with the returning charge form.The diameter of granulating disc is 300mm, and the dish height is 30mm, and the inclination angle is 50 °.Amount by 4.0kg/h adds through being heated to the about 90 ℃ Repone K of temperature then, and the molten urea solution of 95% (weight) is by being sprayed on the fertilizer bed of material with the amount of compressed-air actuated nozzle by 5.0kg/h simultaneously.The control material layer temperature is 90～100 ℃.Granulating disc continuous operation, glomerate fertiliser granulates constantly leave tablets press and enter system light tube, and the effect that is subjected to soft mechanical force in system light tube makes the fertiliser granulates smooth surface, and the inclination angle of system light tube is 2 °.The fertilizer that goes out to make the light tube is through screening, and the granulated fertilizer of certain particle size range is qualified granular composite N-K fertilizer after cooling, and the granulated fertilizer of greater particle size after fragmentation and fine powder turn back to together and continue granulation in the granulating disc.Screening result: 1.4～4mm particle accounts for more than 85%.Analyzing qualified fertilizer product result shows and contains N:26.12%, K in the finished granule
2O:28.68%.Granule strength is about 30 newton.
Embodiment 2:
Denitrogenating potash fertilizer returning charge dosage is 12.0kg/h, and being heated to about 80 ℃ Repone K dosage is 2.0kg/h, and the molten urea solution dosage is 5.0kg/h, 90～105 ℃ of control material layer temperatures, and the inclination angle of system light tube is outside 4 °, other production stage is with embodiment 1.Screening result: 4～6mm particle accounts for more than 70%.Analyzing qualified fertilizer product result shows and contains N:29.89%, K in the finished granule
2O:18.25%.Granule strength is for being about 35 newton.
Embodiment 3:
Denitrogenating potash fertilizer returning charge dosage is 12.0kg/h, and being heated to about 110 ℃ Repone K dosage is 2.0kg/h, and the molten urea solution dosage is 8.0kg/h, and outside 90～105 ℃ of the material layer temperatures of control, other production stage is with embodiment 1.Screening result: 4～6mm particle accounts for more than 75%.Analyzing qualified fertilizer product result shows and contains N:34.15%, K in the finished granule
2O:12.74%.Granule strength is 50 newton.
Embodiment 4:
Denitrogenating potash fertilizer returning charge dosage is 12.0kg/h, and being heated to about 100 ℃ Repone K dosage is 6.0kg/h, and the molten urea solution dosage is 5.0kg/h, and outside 90～105 ℃ of the material layer temperatures of control, other production stage is with embodiment 1.Screening result: 1.4～4mm particle accounts for more than 80%.Analyzing qualified fertilizer product result shows and contains N:19.65%, K in the finished granule
2O:32.96%.Granule strength is 25 newton.
Embodiment 5:
Previously prepared nitrogen potash fertilizer is added in the granulating disc that is rotating by 13.0kg/h with the returning charge form.The diameter of granulating disc is 300mm, and the dish height is 25mm, and the inclination angle is 45 °.Amount by 2.0kg/h adds through being heated to the about 95 ℃ Repone K of temperature then, amount by 1.0kg/h adds through being heated to the about 95 ℃ ground dolomite of temperature, and the molten urea solution of 99% (weight) is by being sprayed on the fertilizer bed of material with the amount of compressed-air actuated nozzle by 5.0kg/h simultaneously.The control material layer temperature is 95～105 ℃.Granulating disc continuous operation, glomerate fertiliser granulates constantly leave tablets press and enter system light tube, and the effect that is subjected to soft mechanical force in system light tube makes the fertiliser granulates smooth surface, and the inclination angle of system light tube is 3 °.The fertilizer that goes out to make the light tube is through screening, and the granulated fertilizer of certain particle size range is qualified granular composite N-K fertilizer after cooling, and the granulated fertilizer of greater particle size after fragmentation and fine powder turn back to together and continue granulation in the granulating disc.Screening result: 4～6mm particle accounts for more than 70%.Increase the returning charge amount to 18.0kg/h, the grain diameter that leaves tablets press diminishes, and size test result 1.4～4mm particle accounts for more than 80%.Analyzing qualified fertilizer product result shows and contains N:28.12%, K in the finished granule
2O:15.35%.
Embodiment 6:
Previously prepared nitrogen potash fertilizer is added in the granulating disc that is rotating by 8.0kg/h with the returning charge form.The diameter of granulating disc is 300mm, and the dish height is 37.5mm, and the inclination angle is 55 °.Amount by 3.0kg/h adds through being heated to the about 95 ℃ Repone K of temperature then, amount by 2.0kg/h adds through being heated to the about 95 ℃ ground dolomite of temperature, and the molten urea solution of 99% (weight) is by being sprayed on the fertilizer bed of material with the amount of compressed-air actuated nozzle by 7.0kg/h simultaneously.The control material layer temperature is 95～105 ℃.Granulating disc continuous operation, glomerate fertiliser granulates constantly leave tablets press and enter system light tube, and the effect that is subjected to soft mechanical force in system light tube makes the fertiliser granulates smooth surface, and the inclination angle of system light tube is 3 °.The fertilizer that goes out to make the light tube is through screening, and the granulated fertilizer of certain particle size range is qualified granular composite N-K fertilizer after cooling, and the granulated fertilizer of greater particle size after fragmentation and fine powder turn back to together and continue granulation in the granulating disc.Screening result: 6～8mm particle accounts for more than 65%.Increase the returning charge amount to 14.0kg/h, the grain diameter that leaves tablets press diminishes, and size test result 1.4～4mm particle accounts for more than 80%.Analyzing qualified fertilizer product result shows and contains N:26.12%, K in the finished granule
2O:15.35%.6～8mm particulate granule strength is 38 newton, and 1.4～4mm particulate granule strength is 27 newton.
Embodiment 7:
Denitrogenating the fertile returning charge dosage of potassium (vitriolate of tartar) is 12.0kg/h, and being heated to about 100 ℃ vitriolate of tartar dosage is 6.0kg/h, and the molten urea solution dosage is 5.0kg/h, and outside 90～105 ℃ of the material layer temperatures of control, other production stage is with embodiment 1.Screening result: 1.4～4mm particle accounts for more than 80%.Analyzing qualified fertilizer product result shows and contains N:19.87%, K in the finished granule
2O:26.96%.Granule strength is for being about 35 newton.
Embodiment 8:
By adding magnesium sulfate heptahydrate 0.02kg in every kg Repone K, copper sulfate 0.01kg, ammonium molybdate 0.01kg, zinc sulfate 0.01kg, boric acid 0.01kg, manganous sulfate 0.01kg, mixing and being heated to temperature is 80～90 ℃, nitrogen potash fertilizer returning charge dosage is 10.0kg/h, being heated to about 100 ℃ Repone K potassium dosage is 5.0kg/h, the molten urea solution dosage is 4.0kg/h, 90～100 ℃ of control material layer temperatures, and other production stage is with embodiment 1.Screening result: 1.4～6mm particle accounts for more than 75%.Analyzing qualified fertilizer product result shows and contains N:19.84%, K in the finished granule
2O:32.56%.Contain moderate-element sulphur, magnesium and trace copper, molybdenum, zinc, boron, manganese etc. in the product simultaneously.
Claims (7)
1, a kind of manufacture method of granular composite N-K fertilizer is characterized in that this method comprises the steps:
(1) granularity is heated to 80～110 ℃ less than Repone K or the vitriolate of tartar of 1mm, sends into operating granulating disc,
(2) urea soln of concentration 〉=95% (weight) is sprayed on the moving fine particle fertilizer surface in the granulating disc, granulation,
(3) reach regulation size particles fertilizer and leave tablets press and enter system light tube, the temperature of leaving the granulated fertilizer of tablets press is not less than 80 ℃, and fertiliser granulates is subjected to mechanical force in system light tube effect makes the fertiliser granulates smooth surface,
(4) granulated fertilizer that comes out from system light tube is granular composite N-K fertilizer after screening, cooling, and the granulated fertilizer of greater particle size after fragmentation and fine powder turn back to together and continue granulation in the granulating disc.
2, the manufacture method of composite fertilizer as claimed in claim 1, the additional proportion that it is characterized in that described urea and Repone K is a urea: Repone K=(0.8～4): 1 (weight).
3, the manufacture method of composite fertilizer as claimed in claim 1, the disk tilt angle that it is characterized in that described granulating disc are 45 °～55 °, and blade diameter length ratio is (8～12): 1.
4, the manufacture method of composite fertilizer as claimed in claim 1 is characterized in that described system light tube is that the inclination angle is 2 °～4 °, the slick rotary drum of operating area.
5, the manufacture method of granular nitrogen-potassium composite fertilizer according to claim 1, it is characterized in that in urea strong solution and Repone K or vitriolate of tartar granulation, also can add moderate-element compound or trace compound, in obtaining containing, the trace element granular nitrogen-potassium composite fertilizer.
6, the manufacture method of granular nitrogen-potassium composite fertilizer according to claim 5 is characterized in that described moderate-element compound is one or more the mixture in calcium cpd, magnesium compound, the sulphur compound; Described trace compound is one or more the mixture in boron compound, copper compound, iron cpd, manganic compound, molybdenum compound, the zn cpds.
7,, it is characterized in that described moderate-element compound is one or more the mixture in the compounds such as calcium sulfate, nitrocalcite, sal epsom, potassium magnesium sulfate, sulphur according to the manufacture method of claim 5 or 6 described granular nitrogen-potassium composite fertilizers; Described trace compound is one or more the mixture in the compounds such as copper sulfate, cupric oxide, ammonium molybdate, Sodium orthomolybdate, boric acid, borax, ferrous sulfate, chelated iron, zinc sulfate, zinc oxide, zinc chloride, manganous sulfate, manganese oxide, Manganous chloride tetrahydrate.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB001276794A CN1174940C (en) | 2000-12-01 | 2000-12-01 | Process for preparing granular composite N-K fertilizer |
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| CNB001276794A CN1174940C (en) | 2000-12-01 | 2000-12-01 | Process for preparing granular composite N-K fertilizer |
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| CN1293176A true CN1293176A (en) | 2001-05-02 |
| CN1174940C CN1174940C (en) | 2004-11-10 |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102001899A (en) * | 2009-12-15 | 2011-04-06 | 深圳市芭田生态工程股份有限公司 | Bulk blended fertilizer and preparing method thereof |
| CN103086782A (en) * | 2013-02-04 | 2013-05-08 | 湖北登丰化工有限公司 | Granulation method of composite fertilizer comprising ammonium chloride |
| CN104710213A (en) * | 2014-12-31 | 2015-06-17 | 北方华锦化学工业集团有限公司 | Rounded grain potash fertilizer production method |
| CN105601454A (en) * | 2015-12-29 | 2016-05-25 | 山西澳坤生物农业股份有限公司 | Preparation method for granular fertilizer |
| CN106278463A (en) * | 2016-08-15 | 2017-01-04 | 湖北富邦科技股份有限公司 | A kind of preparation method of the grains dedicated potash fertilizer of Oryza sativa L. |
| CN106278607A (en) * | 2016-08-15 | 2017-01-04 | 湖北富邦科技股份有限公司 | A kind of preparation method containing zinc slow release rounded grain potash fertilizer |
| CN106278464A (en) * | 2016-08-15 | 2017-01-04 | 湖北富邦科技股份有限公司 | A kind of grains dedicated potash fertilizer of siliceous Oryza sativa L. and the efficient application method in rice cropping |
| CN108863446A (en) * | 2018-09-29 | 2018-11-23 | 天津华景化工新技术开发有限公司 | A kind of production technology and its production system of bulky grain nitre sulphur ammonium |
| CN113004081A (en) * | 2021-04-23 | 2021-06-22 | 湖北富邦科技股份有限公司 | Preparation method of instant drying-free round particle potash fertilizer |
-
2000
- 2000-12-01 CN CNB001276794A patent/CN1174940C/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102001899A (en) * | 2009-12-15 | 2011-04-06 | 深圳市芭田生态工程股份有限公司 | Bulk blended fertilizer and preparing method thereof |
| CN102001899B (en) * | 2009-12-15 | 2014-05-28 | 深圳市芭田生态工程股份有限公司 | Bulk blended fertilizer and preparing method thereof |
| CN103086782A (en) * | 2013-02-04 | 2013-05-08 | 湖北登丰化工有限公司 | Granulation method of composite fertilizer comprising ammonium chloride |
| CN104710213A (en) * | 2014-12-31 | 2015-06-17 | 北方华锦化学工业集团有限公司 | Rounded grain potash fertilizer production method |
| CN105601454A (en) * | 2015-12-29 | 2016-05-25 | 山西澳坤生物农业股份有限公司 | Preparation method for granular fertilizer |
| CN105601454B (en) * | 2015-12-29 | 2019-08-16 | 山西师范大学 | The preparation method of granular chemical fertilizer |
| CN106278463A (en) * | 2016-08-15 | 2017-01-04 | 湖北富邦科技股份有限公司 | A kind of preparation method of the grains dedicated potash fertilizer of Oryza sativa L. |
| CN106278607A (en) * | 2016-08-15 | 2017-01-04 | 湖北富邦科技股份有限公司 | A kind of preparation method containing zinc slow release rounded grain potash fertilizer |
| CN106278464A (en) * | 2016-08-15 | 2017-01-04 | 湖北富邦科技股份有限公司 | A kind of grains dedicated potash fertilizer of siliceous Oryza sativa L. and the efficient application method in rice cropping |
| CN108863446A (en) * | 2018-09-29 | 2018-11-23 | 天津华景化工新技术开发有限公司 | A kind of production technology and its production system of bulky grain nitre sulphur ammonium |
| CN113004081A (en) * | 2021-04-23 | 2021-06-22 | 湖北富邦科技股份有限公司 | Preparation method of instant drying-free round particle potash fertilizer |
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|---|---|
| CN1174940C (en) | 2004-11-10 |
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