CN101973818B - Process for pelleting urea formaldehyde controlled-release compound fertilizer in high tower - Google Patents
Process for pelleting urea formaldehyde controlled-release compound fertilizer in high tower Download PDFInfo
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- CN101973818B CN101973818B CN 201010518055 CN201010518055A CN101973818B CN 101973818 B CN101973818 B CN 101973818B CN 201010518055 CN201010518055 CN 201010518055 CN 201010518055 A CN201010518055 A CN 201010518055A CN 101973818 B CN101973818 B CN 101973818B
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Abstract
The invention discloses a process for pelleting urea formaldehyde controlled-release compound fertilizer in a high tower, comprising the following processing steps: A, fusing urea; B, mixing with potassium; C, mixing with phosphorus; D, mixing with formaldehyde: mixing the formaldehyde with caustic soda at normal temperature to obtain formaldehyde mixed liquor, enabling the formaldehyde mixed liquor and mixed fusing slurry to flow into a material receiving container, and mixing at the temperature of 80-110 DEG C to form formaldehyde-urea mixed liquor; and E, pelleting in the high tower. The invention has the following beneficial effects: 1, the compound fertilizer provided by the process of the invention contains urea formaldehyde, becomes silk-screen pasty after being dissolved in water,can be absorbed into soil, is difficult to volatilize or run away, can improve the fertilizer utilization ratio by 5-20%, completely accord with the characteristics of urea formaldehyde controlled-release fertilizer and play a role in retaining nitrogen; 2, the compound fertilizer provided by the process of the invention has high grain density, has small possibility of agglomeration, can reduce adhesion and scabbing of equipment, and has high molding ratio and less returned materials; 3, production is not influenced by high-temperature and high-humidity climate and can be carried out in all-weather conditions; and 4, the compound fertilizer is uniformly pelleted and has beautiful appearance.
Description
Technical field
The present invention relates to agricultural fertilizer complete processing field.Be specifically related to the high tower compound fertilizer granulation process.
Background technology
Present known high tower compound fertilizer granulation process comprises slurrying and granulation, and described slurrying is the pulping method of progressively lowering the temperature continuously of connecting in three steps, comprises following processing step:
A, urea melting: in melting groove, add fusing assistant and solid urea, under 120-130 ℃ temperature with the solid urea melting;
B, potassium mix: the urea of melting is flowed in the first reactive tank, then Repone K, ammonium chloride, filler are added in the first reactive tank, mix with fusing urea under 110-120 ℃ temperature;
C, phosphorus mix: the material that mixes in the first reactive tank is flowed in the second reactive tank, will add monoammonium phosphate again and add in the second reactive tank, mix with mixture in the first reactive tank under 110 ℃ temperature, obtain the mixed melting slip;
D, high tower prilling moulding; The double-speed rotating prilling spry of mixed melting slip by high tower sprayed to enter finish granulation in the prilling tower; Again with the particle behind the granulating and forming through cooling, cross scalping, cross dusting cover, coating, be packaged as at last finished product.Excessive or the too small defective particle of grain type after wherein sieving can be used as returning charge and is back to reprocessing in the first reactive tank.
Above-mentioned technique weak point is to volatilize when the composite fertilizer that produces uses very fast, and utilization rate of nitrogen fertilizer is not high enough; More easily lump; Returning charge is more.
Summary of the invention
Purpose of the present invention is exactly for the above-mentioned deficiency of present known high tower compound fertilizer granulation process, and a kind of process for pelleting urea formaldehyde controlled-release compound fertilizer in high tower that provides.
Process for pelleting urea formaldehyde controlled-release compound fertilizer in high tower of the present invention, its processing step is:
A, urea melting: in melting groove, add fusing assistant and solid urea, under 120-130 ℃ temperature with the solid urea melting;
B, potassium mix: the urea of melting is flowed in the first reactive tank, then Repone K, ammonium chloride, filler are added in the first reactive tank, mix with fusing urea under 110-120 ℃ temperature;
C, phosphorus mix: the material that mixes in the first reactive tank is flowed in the second reactive tank, will add monoammonium phosphate again and add in the second reactive tank, mix with mixture in the first reactive tank under 100-110 ℃ temperature, obtain the mixed melting slip;
D, formaldehyde mix: formaldehyde is mixed at normal temperatures with caustic soda, obtain the formaldehyde mixed solution; The formaldehyde mixed solution is flowed in the material receiver with containing urea mixed melting slip, in the lower inside mixing of 80-100 ℃ temperature, form the urea formaldehyde mixed solution;
E, high tower prilling moulding; The double-speed rotating prilling spry of urea formaldehyde mixed solution by high tower sprayed to enter finish granulation in the prilling tower; Again with the particle behind the granulating and forming through cooling, cross scalping, cross dusting cover, coating, be packaged as at last finished product.Excessive or the too small defective particle of grain type after wherein sieving can be used as returning charge and is back to reprocessing in the first reactive tank.
Advantage of the present invention is: 1, urea formaldehyde is contained in the composite fertilizer of this explained hereafter, becomes the silk screen pasty state after dissolving in it in water, and it can be adsorbed in the soil, not volatile or run off, can improve utilization rate of fertilizer 5-20%, meet the feature of urea formaldehyde slow-release fertilizer fully, play effect in nitrogen.2, the compound fertilizer granules density of this explained hereafter is higher, the product prevented from caking, and the adhesion that also can reduce equipment scabs, and ratio of briquetting is high, and returning charge is few.3, produce the impact that can not be subjected to high-temperature high humidity climate, round-the-clock production.4, granulation is even, good looking appearance.
Embodiment
A, urea melting: in melting groove, add solid urea 400kg, under 120-130 ℃ temperature with the solid urea melting;
B, potassium mix: the urea of melting is flowed in the first reactive tank, then Repone K 200kg, ammonium chloride 150kg, filler 25kg (can not add) are added in the first reactive tank, mix with fusing urea under 110-120 ℃ temperature;
C, phosphorus mix: the material that mixes in the first reactive tank is flowed in the second reactive tank, will add monoammonium phosphate 200kg again and add in the second reactive tank, mix with mixture in the first reactive tank under 110 ℃ temperature, obtain the mixed melting slip;
D, formaldehyde mix: formaldehyde 24-60kg is mixed at normal temperatures with caustic soda 0.1-0.4kg, obtain the formaldehyde mixed solution; The formaldehyde mixed solution is sprayed in the material receiver (bulk containers) by flow director, the mixed melting slip also flows in the material receiver by flow director, formaldehyde mixed solution and mixed melting slip under 80-100 ℃ temperature in material receiver hybrid reaction, form the urea formaldehyde mixed solution;
E, high tower prilling moulding; The double-speed rotating prilling spry of urea formaldehyde mixed solution by high tower sprayed to enter finish granulation in the prilling tower, in granulation process, continue simultaneously to finish the hybrid reaction of formaldehyde and urea; Last again with the particle behind the granulating and forming through cooling, cross scalping, cross dusting cover, coating, be packaged as at last finished product, the excessive or too small defective particle of the grain type after wherein sieving can be used as returning charge and is back in the first reactive tank and reprocesses.
Experimental results demonstrate: the adding of formaldehyde mixed solution can only add behind the phosphorus hybrid technique, add after the urea melting technique or behind the potassium hybrid technique all infeasible.
Claims (1)
1. process for pelleting urea formaldehyde controlled-release compound fertilizer in high tower is characterized in that processing step is:
A, urea melting: in melting groove, add solid urea, under 120-130 ℃ temperature with the solid urea melting;
B, potassium mix: the urea of melting is flowed in the first reactive tank, then Repone K, ammonium chloride, filler are added in the first reactive tank, mix with fusing urea under 120-130 ℃ temperature;
C, phosphorus mix: the material that mixes in the first reactive tank is flowed in the second reactive tank, MAP is added in the second reactive tank again, mix with mixture in the first reactive tank under 110 ℃ temperature, obtain the mixed melting slip;
D, formaldehyde mix: formaldehyde is mixed at normal temperatures with caustic soda, obtain the formaldehyde mixed solution;
Formaldehyde mixed solution and mixed melting slip are flowed in the material receiver, in the lower inside mixing of 80-110 ℃ temperature, form the urea formadehyde mixed solution;
E, high tower prilling moulding; The double-speed rotating prilling spry of urea formadehyde mixed solution by high tower sprayed to enter finish granulation in the prilling tower; Again with the particle behind the granulating and forming through cooling, cross scalping, cross dusting cover, cross finished product screen, coating, be packaged as at last finished product, the excessive or too small defective particle of the grain type after wherein sieving can be used as returning charge and is back in the first reactive tank and reprocesses.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010518055 CN101973818B (en) | 2010-10-25 | 2010-10-25 | Process for pelleting urea formaldehyde controlled-release compound fertilizer in high tower |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010518055 CN101973818B (en) | 2010-10-25 | 2010-10-25 | Process for pelleting urea formaldehyde controlled-release compound fertilizer in high tower |
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| Publication Number | Publication Date |
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| CN101973818A CN101973818A (en) | 2011-02-16 |
| CN101973818B true CN101973818B (en) | 2013-03-13 |
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| CN 201010518055 Active CN101973818B (en) | 2010-10-25 | 2010-10-25 | Process for pelleting urea formaldehyde controlled-release compound fertilizer in high tower |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102153392B (en) * | 2011-04-08 | 2014-04-23 | 山东聊城鲁西化工第五化肥有限公司 | Production method of novel slow release urea-formaldehyde compound fertilizer |
| CN102167646B (en) * | 2011-04-29 | 2013-07-10 | 安徽省天享肥业有限责任公司 | Preparation method of urea melt absorption synchronous compound fertilizer |
| CN104140345A (en) * | 2013-05-07 | 2014-11-12 | 湖北茂盛生物有限公司 | Preparing method of urea formaldehyde controlled-release compound fertilizer by urea fusion production |
| CN105503279A (en) * | 2015-12-24 | 2016-04-20 | 贵州省化工研究院 | Slow-release urea formaldehyde fertilizer and preparation method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4714490A (en) * | 1985-05-08 | 1987-12-22 | Kao Corporation | Concretion preventing agent for fertilizers |
| US6709685B1 (en) * | 1998-06-29 | 2004-03-23 | Kemira Agro Oy | Process for the preparation of compound fertilizer granules |
| CN101357859A (en) * | 2007-08-01 | 2009-02-04 | 福建永春县哈迪利复合肥有限责任公司 | Granular complex fertilizer and molten slurry granulation method thereof |
| CN101475414A (en) * | 2008-11-20 | 2009-07-08 | 上海化工研究院 | Production method of tower type prilling slow release fertilizer |
-
2010
- 2010-10-25 CN CN 201010518055 patent/CN101973818B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4714490A (en) * | 1985-05-08 | 1987-12-22 | Kao Corporation | Concretion preventing agent for fertilizers |
| US6709685B1 (en) * | 1998-06-29 | 2004-03-23 | Kemira Agro Oy | Process for the preparation of compound fertilizer granules |
| CN101357859A (en) * | 2007-08-01 | 2009-02-04 | 福建永春县哈迪利复合肥有限责任公司 | Granular complex fertilizer and molten slurry granulation method thereof |
| CN101475414A (en) * | 2008-11-20 | 2009-07-08 | 上海化工研究院 | Production method of tower type prilling slow release fertilizer |
Non-Patent Citations (2)
| Title |
|---|
| 汪家铭.熔体塔式造粒法生产尿基复混肥.《化肥工业》.2007,第34卷(第1期),第32-35页. * |
| 王月祥等.新型高分子多营养元素缓释肥的制备工艺研究.《化肥设计》.2008,第46卷(第1期),第59-60页. * |
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| CN101973818A (en) | 2011-02-16 |
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Application publication date: 20110216 Assignee: Hubei Woyu Chemical Co., Ltd. Assignor: Yu Zhangcheng Contract record no.: 2013420000081 Denomination of invention: Process for pelleting urea formaldehyde controlled-release compound fertilizer in high tower Granted publication date: 20130313 License type: Exclusive License Record date: 20130708 |
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