CN102503696A - Preparation method for particle compound fertilizer - Google Patents
Preparation method for particle compound fertilizer Download PDFInfo
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- CN102503696A CN102503696A CN2011103540563A CN201110354056A CN102503696A CN 102503696 A CN102503696 A CN 102503696A CN 2011103540563 A CN2011103540563 A CN 2011103540563A CN 201110354056 A CN201110354056 A CN 201110354056A CN 102503696 A CN102503696 A CN 102503696A
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Abstract
The invention relates to a preparation method for a particle compound fertilizer. The method comprises the following steps of: wetting or heating and mixing a basic fertilizer and a filler to obtain a plastically-enhanced material with high moisture content or high temperature; preparing a mixed material into uniform particles through extruding machinery; rounding the surfaces of particle materials; drying (e.g., the step can be eliminated when the temperature for preparing the particle materials is high); and cooling and sieving to obtain the particle compound fertilizer. Compared with the conventional extruding method, the method has the advantage that: abrasion on extruding equipment is reduced. Compared with the conventional agglomerating method, the method has the advantages that: material returning multiple in a production process can be reduced, and production energy consumption and production cost are lowered. Product particles are uniform, are round in appearance, and have high pressure resistance and agglomeration resistance. In production process, waste emission is reduced, and the field operation environment is remarkably improved.
Description
Technical field
The present invention relates to a kind of preparation method of chemical fertilizer, or rather, relate to a kind of preparation method of granular complex fertilizer.
Background technology
At present, the prilling process of base fertilizer secondary processing production particulate state composite fertilizer generally has extrusion process, granulating method and melting method.
The granulating method production technique is present commonplace complex fertilizer production method, and the main manufacturing procedure of this method is: raw materials mix → raw material mixes with returning charge → rotary drum or disk granulation → drying → cooling → screening → finished product.Because the limitation of pellet granulation method has 1～2 times of defective particle to finished product to want retrieval system in the screening operation, therefore usually; Caused the increase of dry and cooling load; And fine silt is easy to carried secretly by tail gas in dry and process of cooling, is difficult for reclaiming, and causes line clogging; Be brought into that fine silt also can cause environmental pollution in the atmosphere, the also corresponding increase of the loss of raw material.
Though extruder granulation technology has also obtained popularization in small-scale manufacturer; But because the product particle appearance poor is irregular, the surface is crude; Therefore the occupation rate of product in multiple fertile market is not high; And the extruder member wear rate of production unit is high, and it is big to change frequency, and cost and maintenance cost are higher.
Summary of the invention
The preparation method who the purpose of this invention is to provide a kind of novel composite fertilizer.The inventive method is to the limitation of above-mentioned two kinds of prilling process; Existing complex fertilizer production method is improved; Two kinds of prilling process are combined, strengthen blended fertilizer material plasticity-earlier, reduce the pressure intensity of extruder grain; On the half-finished basis of extruder grain, take measures fertiliser granulates is carried out rounding then, prepare qualified composite fertilizer.
Present method is to realize like this.Compounded fertilizer of granulated preparation method for material of the present invention is characterized in, this method may further comprise the steps:
(1) base fertilizer and stopping composition are processed the plasticity-enhanced material that contains than high-moisture or comparatively high temps after humidification or heating mixing;
(2) step (1) plasticity-enhanced material carries out granulation through extrusion machinery, processes granule materials of uniform size;
(3) granule materials of step (2) carries out surperficial rounding;
(4) material of step (3) is through drying, and perhaps when the temperature of preparation granule materials was higher, this drying step can save, and promptly processed granular complex fertilizer after cooling and the screening.
Moisture content in the plasticity-enhanced material of the present invention is 0.5%～10% by weight percentage; When the moisture content in the plasticity-enhanced material is 0.5%～2%, need to improve plasticity-enhanced material temperature to 60 ℃～95 ℃, can save the drying process in the step (4) like this.
Plasticity-enhanced material temperature of the present invention is a normal temperature to 95 ℃, and when temperature was 60 ℃～95 ℃, the moisture content in the granule materials was 0.5%～2% o'clock by weight percentage, can save the drying process in the step (4).
It is to adopt the mode of roll-in, rolling mold pressing or screw rod extruding to carry out granulation that the plasticity-enhancing material of step according to the invention (2) carries out granulation.
It is to adopt the mode of disk granulation or drum granulating to carry out rounding that the granule materials of step according to the invention (3) carries out rounding.
Base fertilizer of the present invention is selected from urea, ammonium sulfate, by one or more the mixture that adds in an ammonium nitrate in modification ammonium nitrate that phosphorus ammonium or other nonreactant process, ammonium chloride, monoammonium phosphate, diammonium phosphate, normal superphosphate, double superhosphate, Repone K, the vitriolate of tartar.
Can replenish sulfuric acid or the phosphoric acid and the ammonia of part in the base fertilizer among the present invention, rely on the ammonia and the reaction heat of acid to improve the temperature of mixture.
Stopping composition described in the present invention is selected from one or more the mixture in rhombspar, Wingdale, wilkinite, kaolin, the attapulgite.
When the granule materials of step described in the present invention (3) carries out surperficial rounding, simultaneously fertiliser granulates is carried out the surface face powder and handle, the powder of being selected for use is powder mixture or the Powdered inertia stopping composition identical with fertilizer components.
Heating blended origin of heat is the form that adopts feeding steam, high temperature slip to carry the reaction heat between heat, part material fusing heat, the raw material or take the regenerator section raw material in the step described in the present invention (1).
The inventive method is with the nutritional needs ratio batching according to farm crop such as the base fertilizer of producing the composite fertilizer use and stopping composition; Mix; Through improving the temperature of mixture for mixture humidification or heating; Strengthen the plasticity-of mixture, be prepared into particle of uniform size through means such as extruding, strippings and slicings, particle can be square, right cylinder or ellipsoid etc.
In the extrusion process, because material has been carried out humidification or temperature raising, the plasticity-of mixture strengthens; As the conventional extruded method, need need not very strong external force extruding just can make mixture form particle, simultaneously, in the granules prepn process; The material heat that produces that is squeezed also can also be used to improve material temperature, therefore, the wearing and tearing of extrusion equipment is reduced; Energy consumption reduces, and the replacing frequency of equipment consumable accessory also reduces, and has reduced production cost.
The equipment of extruding and granules prepn can be with reference to using screw rod extrusion equipment, pair roller extruding or rolling molding apparatus etc.
The particle that extruding just prepares still keeps certain plasticity-; Easy deformation; Therefore, can in equipment such as granulating disc or rotary drum granulator, carry out rounding, the outward appearance that obtains product particle is more mellow and fuller and regular than the product of conventional extruded method and granulating method technology.
Employing adds the fertiliser granulates that water humidification mode prepares, and behind the particle rounding, gets into the drying machine oven dry and removes portion of water, obtains finished product after cooling, the screening.Adopt the particle of high temperature low moisture fashion of extrusion preparation, drying-free behind the particle rounding directly gets into cooling system and treats promptly to obtain finished product after the fertiliser granulates temperature descends.
The inventive method is owing to seldom have the fine powder returning charge to produce in the extruding preparation particulate process; Therefore the material overwhelming majority that gets into drying, cooling, screening system is qualified particle; Seldom entrained fines returning charge; The load of drying, cooling and screening process is compared common granulating method technology and is greatly alleviated, and energy consumption reduces, and exhaust gas emission reduces.
Owing to seldom returning charge, dry, refrigerative load reduces significantly in the follow-up drying of the inventive method, cooling, the screening process.The dust content of carrying secretly in the tail gas also greatly reduces, comprehensively more traditional granulating method technology, energy consumption of unit product greatly descends, in the tail gas dust content seldom, the exhaust emissions amount reduces more than 2/3, makes that the processing of tail gas is more simple.
To the factory of high temperature urine slip or phosphoric acid one (two) ammonium slip etc. is arranged, can directly utilize the heat of high temperature slip further to cut down the consumption of energy, reduce process cost.
On the basis of optimizing materials prescription, raising mixture temperature, can accomplish the drying-free step fully, technical process is more easy.
The inventive method compared with prior art has the following advantages:
1, the present invention has combined extruder grain and rotary drum prilling process advantage separately, has remedied deficiency separately.Owing to improved the plasticity-of mixture, reduced the extrusion equipment wearing and tearing, reduced energy consumption, the replacing frequency of equipment consumable accessory reduces, and has reduced production cost.
2, the fertilizer product particle size homogeneous of the present invention's preparation, the outward appearance rounding has good resistance to compression and agglomeration preventing performance.
3, the returning charge multiple in the production process of the present invention is less than 15%, and the unit product production energy consumption reduces, and discharge amount of exhaust gas reduces, and the execute-in-place environment obviously improves.
4, adopt present method, the scale of production equipment is changeable, and one-time investment and floor space reduce, and the level of automation of production process is higher.
Description of drawings
Fig. 1 is preparation technology's schema of composite fertilizer of the present invention.
Embodiment
Come the present invention further is discussed in more detail below by enumerating the part specific embodiment, but these embodiment are not limitations of the present invention.Percentage composition among following each embodiment all is a weight percentage.
Embodiment 1
Shown in preparing method's technical process of the composite fertilizer of the present invention of Fig. 1; The inventive method is that base fertilizer and stopping composition after the batching are made for the plasticity-enhanced material that contains than high-moisture or comparatively high temps after humidification, heating, mixing; Process granule materials through the extrusion machinery granulation; Granule materials carries out surperficial rounding, and the material behind the rounding is promptly processed the granular complex fertilizer product after drying, cooling and screening.
The raw material of motion device is formed as follows:
| Sequence number | Base fertilizer and stopping composition kind | Inlet amount | Unit |
| 1 | Urea (N:46%) | 1.37 | t/h |
| 2 | Ammonium chloride (N:23.5%) | 0.71 | t/h |
| 3 | Monoammonium phosphate (N:11% P 2O 5：44％) | 2.41 | t/h |
| 4 | Repone K (K 2O＞60％) | 1.77 | t/h |
| 5 | Kaolin | 0.90 | t/h |
Product specification: N-P
2O
5-K
2O=15-15-15.
Hour product production: 7 tons/hour.
The granulating equipment that adopts: screw rod extruding (pellet device is joined in the extruding outlet).
Advance the extrusion machine material moisture: 3%～8%, adopt twin shaft mixer mixing humidification.
Advance the extrusion machine temperature of charge: normal temperature.
Extruding back particle size: 4 * 4 * 4mm square.
1.6 * 6 meters rotary drums of rounding equipment: Φ, inclination angle 2.5 degree.
1.8 * 18 meters of dryer: Φ.
1.8 * 18 meters of cooler: Φ.
Embodiment 2
The preparation method of composite fertilizer is with embodiment 1, but the raw material that adopts is formed and extrusion equipment changes.
Advancing the raw material of system forms as follows:
| Sequence number | Base fertilizer and stopping composition kind | Inlet amount | Unit |
| 1 | Ammonium sulfate (N:20%) | 3.58 | t/h |
| 2 | Monoammonium phosphate (N:11%P 2O 5：44％) | 1.21 | t/h |
| 3 | Normal superphosphate (P 2O 5：15％) | 1.18 | t/h |
| 4 | Vitriolate of tartar (K 2O＞50％) | 1.13 | t/h |
Product specification: N-P
2O
5-K
2O=12-10-8.
Hour product production: 7 tons/hour.
The granulating equipment that adopts: pair roller extruding.
Advance the extrusion machine material moisture: 5%～12%, adopt twin shaft mixer mixing humidification.
Advance the extrusion machine temperature of charge: normal temperature.
Extruding back particle size:＜4mm spheroid.
1.6 * 6 meters rotary drums of rounding equipment: Φ, inclination angle 2.5 degree.
1.8 * 18 meters of dryer: Φ.
1.8 * 18 meters of cooler: Φ.
Embodiment 3
The preparation method of composite fertilizer is with embodiment 1, but the raw material that adopts is formed and extrusion equipment changes.
Advancing the raw material of system forms as follows:
| Sequence number | Base fertilizer and stopping composition kind | Inlet amount | Unit |
| 1 | Ammonium chloride (N:23.5%) | 1.25 | t/h |
| 2 | Diammonium phosphate (N:18%P 2O 5：46％) | 0.62 | t/h |
| 3 | Normal superphosphate (P 2O 5：15％) | 0.81 | t/h |
| 4 | Repone K (K 2O＞60％) | 0.67 | t/h |
| 5 | Wilkinite | 0.75 | t/h |
Product specification: N-P
2O
5-K
2O=10-10-10.
Hour product production: 4 tons/hour.
The granulating equipment that adopts: rolling mold pressing.
Advance the extrusion machine material moisture: 5%～12%, adopt twin shaft mixer mixing humidification.
Advance the extrusion machine temperature of charge: normal temperature.
Extruding back particle size: 4 * 4 * 4mm square.
2.5 meters disks of rounding equipment: Φ.
1.6 * 16 meters of dryer: Φ.
1.6 * 16 meters of cooler: Φ.
Embodiment 4
The preparation method of composite fertilizer is with embodiment 1, but the raw material that adopts is formed and extrusion equipment changes.
Advancing the raw material of system forms as follows:
| Sequence number | Base fertilizer and stopping composition kind | Inlet amount | Unit |
| 1 | Modification ammonium nitrate (N:32%P 2O 5：4％) | 2.58 | t/h |
| 2 | Diammonium phosphate (N:18%P 2O 5：46％) | 1.31 | t/h |
| 3 | Vitriolate of tartar (K 2O＞50％) | 1.41 | t/h |
| 4 | Limestone powder | 1.84 | t/h |
Product specification: N-P
2O
5-K
2O=15-10-10.
Hour product production: 7 tons/hour.
The granulating equipment that adopts: screw rod extruding (pellet device is joined in the extruding outlet).
Advance the extrusion machine material moisture: 2%～4%, wherein the modification ammonium nitrate add aqueous fusion change into 120 ℃ ,～add the twin shaft mixer mixing behind 95% solution.
Advance the extrusion machine temperature of charge: 50～70 ℃.
Extruding back particle size: 4 * 4 * 4mm square.
1.6 * 6 meters rotary drums of rounding equipment: Φ, inclination angle 2.5 degree.
1.8 * 18 meters of dryer: Φ.
1.8 * 18 meters of cooler: Φ.
Embodiment 5
Shown in preparing method's technical process of the composite fertilizer of the present invention of Fig. 1, the preparation method of composite fertilizer is with embodiment 1, but present embodiment has saved drying process wherein.
Advancing the raw material of system forms as follows:
| Sequence number | Base fertilizer and stopping composition kind | Inlet amount | Unit |
| 1 | Urea (N:46%) | 1.73 | t/h |
| 2 | Monoammonium phosphate (N:11%P 2O 5：44％) | 2.41 | t/h |
| 3 | Repone K (K 2O＞60％) | 1.77 | t/h |
| 4 | Wilkinite | 1.24 | t/h |
Product specification: N-P
2O
5-K
2O=15-15-15.
Hour product production: 7 tons/hour.
The granulating equipment that adopts: screw rod extruding (pellet device is joined in the extruding outlet).
Advance the extrusion machine material moisture :～1.5%, wherein urea fusing back adds the twin shaft mixer mixing.
Advance the extrusion machine temperature of charge: 70～80 ℃, the part powder raw material need carry out preheating when envrionment temperature was low.
Extruding back particle size: 4 * 4 * 4mm square.
1.6 * 6 meters rotary drums of rounding equipment: Φ, inclination angle 2.5 degree.
Dryer: do not have.
1.8 * 18 meters of cooler: Φ.
Embodiment 6
The preparation method of composite fertilizer is with embodiment 5, but the composition of raw material and granulating equipment change.
Advancing the raw material of system forms as follows:
| Sequence number | Base fertilizer and stopping composition kind | Inlet amount | Unit |
| 1 | Urea (N:46%) | 2.17 | t/h |
| 2 | Diammonium phosphate (N:18%P 2O 5：46％) | 2.31 | t/h |
| 3 | Vitriolate of tartar (K 2O＞50％) | 1.41 | t/h |
| 4 | Kaolin | 1.25 | t/h |
Product specification: N-P
2O
5-K
2O=20-15-10.
Hour product production: 7 tons/hour.
The granulating equipment that adopts: pair roller extruding.
Advance the extrusion machine material moisture :～1.2%, wherein urea fusing back adds the twin shaft mixer mixing.
Advance the extrusion machine temperature of charge: 75～85 ℃.
Extruding back particle size:＜4mm spheroid.
1.6 * 6 meters rotary drums of rounding equipment: Φ, inclination angle 2.5 degree.
Dryer: do not have.
1.8 * 18 meters of cooler: Φ.
Embodiment 7
The preparation method of composite fertilizer is with embodiment 5, but the composition of raw material changes, and the extrusion equipment of employing is a rolling mold pressing form.
Advancing the raw material of system forms as follows:
| Sequence number | Base fertilizer and stopping composition kind | Inlet amount | Unit |
| 1 | Urea (N:46%) | 1.07 | t/h |
| 2 | Diammonium phosphate (N:18%P 2O 5：46％) | 1.32 | t/h |
| 3 | Repone K (K 2O＞60％) | 0.81 | t/h |
| 4 | Attapulgite powder | 0.90 | t/h |
Product specification: N-P
2O
5-K
2O=18-15-12.
Hour product production: 4 tons/hour.
The granulating equipment that adopts: rolling mold pressing (pellet device is joined in the extruding outlet).
Advance the extrusion machine material moisture :～1.5%, wherein urea fusing back adds the twin shaft mixer mixing.
Advance the extrusion machine temperature of charge: 75～85 ℃, the part powder raw material need carry out preheating when envrionment temperature was low.
Extruding back particle size: 4 * 4 * 4mm square.
2.5 meters disks of rounding equipment: Φ.
Dryer: do not have.
1.6 * 16 meters of cooler: Φ.
Embodiment 8
The preparation method of composite fertilizer is with embodiment 5, but the composition of raw material changes, and adds ammonia and sulfuric acid in the raw materials mix process, utilizes reaction heat to improve temperature of charge.
Advancing the raw material of system forms as follows:
| Sequence number | Base fertilizer and stopping composition kind | Inlet amount | Unit |
| 1 | Urea (N:46%) | 1.36 | t/h |
| 2 | Monoammonium phosphate (N:11%P 2O 5：44％) | 2.41 | t/h |
| 3 | Repone K (K 2O＞60％) | 1.77 | t/h |
| 4 | NH 3 | 0.21 | t/h |
| 5 | The vitriol oil | 0.21 | t/h |
| 6 | Wilkinite | 1.19 | t/h |
Product specification: N-P
2O
5-K
2O=15-15-15.
Hour product production: 7 tons/hour.
The granulating equipment that adopts: screw rod extruding (pellet device is joined in the extruding outlet).
Advance the extrusion machine material moisture :～1.0%, wherein urea fusing back adds twin shaft mixing tank, NH
3Add mixing tank and urine and other solid, powdery mixing of materials with the vitriol oil through pipeline.
Advance the extrusion machine temperature of charge: 75～85 ℃.
Extruding back particle size: 4 * 4 * 4mm square.
1.6 * 6 meters rotary drums of rounding equipment: Φ, inclination angle 2.5 degree.
Dryer: do not have.
1.8 * 18 meters of cooler: Φ.
Claims (10)
1. the preparation method of a granular complex fertilizer is characterized in that, this method may further comprise the steps:
(1) base fertilizer and stopping composition are processed the plasticity-enhanced material that contains than high-moisture or comparatively high temps after humidification or heating mixing;
(2) step (1) plasticity-enhanced material carries out granulation through extrusion machinery, processes granule materials of uniform size;
(3) granule materials of step (2) carries out surperficial rounding;
(4) material of step (3) is through drying, and perhaps when the temperature of preparation granule materials was higher, this drying step can save, and promptly processed granular complex fertilizer after cooling and the screening.
2. composite fertilizer preparation method according to claim 1 is characterized in that, the moisture content in the described plasticity-enhanced material is 0.5%～10% by weight percentage; When the moisture content in the plasticity-enhanced material is 0.5%～2%, need to improve plasticity-enhanced material temperature to 60 ℃～95 ℃, can save the drying process in the step (4) like this.
3. composite fertilizer preparation method according to claim 1; It is characterized in that; Described plasticity-enhanced material temperature is a normal temperature to 95 ℃; When temperature was 60 ℃～95 ℃, the moisture content in the granule materials was 0.5%～2% o'clock by weight percentage, can save the drying process in the step (4).
4. composite fertilizer preparation method according to claim 1 is characterized in that, it is to adopt the mode of roll-in, rolling mold pressing or screw rod extruding to carry out granulation that the plasticity-enhancing material of said step (2) carries out granulation.
5. composite fertilizer preparation method according to claim 1 is characterized in that, it is to adopt the mode of disk granulation or drum granulating to carry out rounding that the granule materials of said step (3) carries out rounding.
6. composite fertilizer preparation method according to claim 1; It is characterized in that described base fertilizer is selected from urea, ammonium sulfate, by one or more the mixture that adds in an ammonium nitrate in modification ammonium nitrate that phosphorus ammonium or other nonreactant process, ammonium chloride, monoammonium phosphate, diammonium phosphate, normal superphosphate, double superhosphate, Repone K, the vitriolate of tartar.
7. composite fertilizer preparation method according to claim 6 is characterized in that, replenishes sulfuric acid or the phosphoric acid and the ammonia of part in the base fertilizer, relies on the ammonia and the reaction heat of acid to improve the temperature of mixture.
8. composite fertilizer preparation method according to claim 1 is characterized in that, described stopping composition is selected from one or more the mixture in rhombspar, Wingdale, wilkinite, kaolin, the attapulgite.
9. composite fertilizer preparation method according to claim 1; It is characterized in that; When the granule materials of said step (3) carries out surperficial rounding, simultaneously fertiliser granulates is carried out the surface face powder and handle, the powder of being selected for use is powder mixture or the Powdered inertia stopping composition identical with fertilizer components.
10. composite fertilizer preparation method according to claim 1; It is characterized in that heating blended origin of heat is the form that adopts feeding steam, high temperature slip to carry the reaction heat between heat, part material fusing heat, the raw material or take the regenerator section raw material in the said step (1).
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Cited By (11)
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| CN102898247A (en) * | 2012-11-13 | 2013-01-30 | 赵显民 | Method for preparing organic and inorganic blended fertilizer |
| CN103910556A (en) * | 2013-10-31 | 2014-07-09 | 湖北景程化工有限公司 | Energy-saving environment-friendly production technology for compound fertilizer |
| CN104072260A (en) * | 2014-05-29 | 2014-10-01 | 苏州上研化肥科技发展有限公司 | Multifunctional production system for compound fertilizer |
| CN104261903A (en) * | 2014-09-04 | 2015-01-07 | 辽宁鑫水化工集团有限公司 | Method and equipment of processing rounded potassium sulfate grains |
| CN106242646A (en) * | 2016-08-08 | 2016-12-21 | 绥芬河市石英经贸有限公司 | A kind of prilling process of circular granular potash fertilizer |
| CN107878789A (en) * | 2017-09-28 | 2018-04-06 | 江苏福亿自动化设备有限公司 | A kind of screw extruding powder granulating system and prilling |
| CN108752080A (en) * | 2018-08-02 | 2018-11-06 | 张居政 | A method of using the legal preparation composite fertilizer of extruded carbon |
| CN109279961A (en) * | 2018-10-31 | 2019-01-29 | 华中农业大学 | It is a kind of based on rice-ratooning rice head season rice basal fertilizer fertilizer and preparation method |
| CN109748733A (en) * | 2019-03-27 | 2019-05-14 | 上海化工研究院有限公司 | A kind of method that coating is granulated production granular complex fertilizer |
| CN110526761A (en) * | 2019-10-16 | 2019-12-03 | 贵州西洋实业有限公司 | A kind of granulated fertilizer and its dry technology for production |
| WO2023226911A1 (en) * | 2022-05-25 | 2023-11-30 | 山东省农业科学院 | Preparation method for compound fertilizer having water retention and nutrient retention functions |
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| CN103910556B (en) * | 2013-10-31 | 2016-04-27 | 湖北景程化工有限公司 | Energy saving and environment friendly Compound fertilizer production technology |
| CN103910556A (en) * | 2013-10-31 | 2014-07-09 | 湖北景程化工有限公司 | Energy-saving environment-friendly production technology for compound fertilizer |
| CN104072260A (en) * | 2014-05-29 | 2014-10-01 | 苏州上研化肥科技发展有限公司 | Multifunctional production system for compound fertilizer |
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| CN107878789A (en) * | 2017-09-28 | 2018-04-06 | 江苏福亿自动化设备有限公司 | A kind of screw extruding powder granulating system and prilling |
| CN107878789B (en) * | 2017-09-28 | 2019-07-12 | 江苏福亿自动化设备有限公司 | A kind of screw extruding powder granulating system and prilling |
| CN108752080A (en) * | 2018-08-02 | 2018-11-06 | 张居政 | A method of using the legal preparation composite fertilizer of extruded carbon |
| CN109279961A (en) * | 2018-10-31 | 2019-01-29 | 华中农业大学 | It is a kind of based on rice-ratooning rice head season rice basal fertilizer fertilizer and preparation method |
| CN109748733A (en) * | 2019-03-27 | 2019-05-14 | 上海化工研究院有限公司 | A kind of method that coating is granulated production granular complex fertilizer |
| CN110526761A (en) * | 2019-10-16 | 2019-12-03 | 贵州西洋实业有限公司 | A kind of granulated fertilizer and its dry technology for production |
| WO2023226911A1 (en) * | 2022-05-25 | 2023-11-30 | 山东省农业科学院 | Preparation method for compound fertilizer having water retention and nutrient retention functions |
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Application publication date: 20120620 |