CN1453248A - High-nitrogen urine-based medium-concentration composite fertilizer and its production process - Google Patents
High-nitrogen urine-based medium-concentration composite fertilizer and its production process Download PDFInfo
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- CN1453248A CN1453248A CN 02114075 CN02114075A CN1453248A CN 1453248 A CN1453248 A CN 1453248A CN 02114075 CN02114075 CN 02114075 CN 02114075 A CN02114075 A CN 02114075A CN 1453248 A CN1453248 A CN 1453248A
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Abstract
The present invention relates to one kind of high-nitrogen urine-based medium-concentration composite fertilizer and its production process. The fertilizer consists of monoammonium phosphate, urea, ammonium sulfate, potassium chloride, ordinary superphosphate and special additive; and has the composition of N: P2O5: K2O of 17-20 to 5-7 to 6-9. The production process has the technological parameters including blast heater temperature 330-420 deg.c, drying kiln head temperature 150-200 deg.c and drying kiln tail temperature 55-65 deg.c. The product has reasonable composition, lasting fertilizing effect and obvious yield increasing effect, and is especially suitable for rice in south China.
Description
Technical Field
The invention relates to a high-nitrogen urea-based medium-concentration compound fertilizer and a manufacturing method thereof.
Background
At present, most of manufacturers for producing compound fertilizers use potassium chloride and ammonium chloride as raw materials, and a large amount of chloride ions are deposited in soil to cause soil acidification, hardening and fertility reduction, and even directly cause harm to crops to cause yield reduction. The unreasonable proportion of 15-15-15 of the conventional universal high-concentration compound fertilizer, wherein excess phosphorus and potassium cause nutrient loss, and the nutrient is high but the effect is poor; meanwhile, the price is high, so the price is not accepted by the user. Therefore, the high-nitrogen compound fertilizer using neutral raw material urea as a nitrogen source is imperative to stand on the market and improve the internal quality of the fertilizer. However, such high nitrogen fertilizers using urea as a nitrogen source have great difficulty in the production process, especially the granulation process of the granulation method.
Many difficulties exist in the process of producing the high-nitrogen compound fertilizer by using urea, many compound fertilizer research institutions and large compound fertilizer manufacturers have made many researches and attempts, the research institutions for researching the compound fertilizer production process at the earliest time design dozens of production devices which produce 10 ten thousand tons of urea in the country and take the urea as a raw material, and almost no device can normally produce in the south; in northern areas of China, plants are built in Hebei Cangzhou chemical fertilizer plants and Anqing petrochemical general plants and compound fertilizer plants which take urea as a raw material for several years, production cannot be normal until now, the urea cannot be used up when the dosage in the proportioning exceeds 20%, and the maximum nitrogen nutrient cannot reach 17%.
Why is it so difficult to produce compound fertilizer with urea? The difficulty is mainly in the following aspects: (1) the urea is easy to melt at high temperature, the melting point is 135 ℃, and the melted urea is easy to scar and stick to the wall. (2) The critical relative humidity of the urea is 74 percent, the urea is strongly hygroscopic and deliquescent when the humidity in the air reaches 75 percent, and the critical hygroscopic point is lower after the urea is mixed with other fertilizers,in this case the production is very difficult to control. (3) The balling rate is low and the material consumption is very high when the solid urea is used for preparing the compound fertilizer. (4) When the temperature of the urea in the system reaches above 60 ℃, the urea is strongly hydrolyzed, granulation and drying are influenced, and the hydrolysis reaction is as follows:
(5) the urea reacts violently with the phosphate fertilizer to generate urea phosphate, and crystal water is released to make the material in a wet mud shape and can not be granulated, and the reaction is as follows:
for example, the problems that the nitrogen content cannot be increased when the urea is used less, the urea cannot be obtained even if 15 percent of the urea is used more, the urea cannot be normally produced, and many scientific research institutions at home and abroad cannot solve the problem, and the high-nitrogen urea-based high-concentration compound fertilizer cannot be produced on a granulation process by a granulation method.
With the development of agriculture and the change of the concept of fertilizer for farmers, the compound fertilizer has more and more important status in agricultural production. Single fertilizers such as urea, ammonium chloride, potassium chloride and phosphate fertilizers and compound fertilizers with unreasonable proportions cannot meet the requirements of high-efficiency agriculture and precision agriculture.
Disclosure of Invention
The invention aims to provide a high-nitrogen urine-based medium-concentration compound fertilizer and a manufacturing method thereof, which aim to solve the problems of soil acidification, hardening and fertility reduction caused by the fact that a large amount of chloride ions are deposited in soil and even harm is directly caused to crops to cause yield reduction because potassium chloride and ammonium chloride are used as raw materials; meanwhile, the problems that urea in the high-nitrogen urea-based medium-concentration compound fertilizer produced by a granulation process by a granulation method is easy to melt at high temperature and the molten urea is easy to scar and stick to the wall are solved; urea absorbs moisture and deliquesces; when the solid urea is used for preparing the compound fertilizer, the balling rate is low, and thematerial consumption is very high; when the temperature of urea in the system reaches above 60 ℃, the urea is strongly hydrolyzed, and granulation and drying are influenced; the urea reacts with the phosphate fertilizer violently to generate urea phosphate, and crystal water is discharged, so that the material is in a wet mud shape and cannot be granulated.
The purpose of the invention is realized by the following steps: the special fertilizerThe high-nitrogen urea-based medium-concentration compound fertilizer contains monoammonium phosphate, urea, ammonium sulfate, potassium chloride, calcium superphosphate and special additives in a ratio of N to P2O5∶K2O is 17-20: 5-7: 6-9. The special additive is prepared from sepiolite, feldspar powder and bentonite in a certain proportion, and Mg is added2+、Zn2+、Fe2+、B+、Mn2+And appropriate amount of trace elements. The method for manufacturing the product of the invention is as follows: the blast furnace temperature is 330-420 deg.c, the drying kiln head temperature is 150-200 deg.c, the kiln tail temperature is 55-65 deg.c, the pelletizing material has water content not greater than 6% and saturated steam pelletizing.
The invention has the advantages of good product granulation, easy drying, stable production, uniform and beautiful finished product granules, strong compatibility and low material consumption in the system. The product is tested that various nutrients are balanced, the nitrogen content exceeds 17 percent, the dissolution is fast, and various indexes all accord with the national standard. The nutrient proportion is very reasonable, the fertilizer is completely suitable for being absorbed by crops, the yield increasing effect is very obvious, and the yield of dry grains is increased by 20-25% on average. Therefore, the product is sold in the market and will become the leading product of the future market. The method of proportioning ammonium chloride is abandoned, and a large amount of urea formula is used for producing the urea-based compound fertilizer with the nitrogen content of more than 17 percent, so that the technical problem of producing the urea series medium-concentration high-nitrogen compound fertilizer by a granulation process for many years is solved, and the method has good economic value and market prospect. The annual production capacity device of fifty thousand tons has a single-shift yield of up to 160 tons, which is 193 percent of the design capacity, and the appearance shape is uniform and complete and can be compared with the imported compound fertilizer. Is especially suitable for planting rice in south of the Yangtze river, and has the features of reasonable proportion, long fertilizer effect, high yield, etc. and obvious yield increasing effect.
Detailed Description
Example 1: the ratio of N to P2O5∶K2High-nitrogen medium-concentration compound fertilizer with O ratio of 17: 6: 7
280kg of urea and 133kg of potassium chloride
Ammonium chloride 50kg ammonium sulfate 80kg
100kg of monoammonium phosphate and 100kg of ordinary superphosphate
260kg of special additive
The process conditions are as follows: the blast furnace temperature is 350-400 deg.c, the drying kiln head temperature is 170-180 deg.c, the kiln tail temperature is 60-62 deg.c, the pelletizing material has water content not greater than 6% and saturated steam pelletizing.
Example 2: the ratio of N to P2O5∶K2High-nitrogen medium-concentration compound fertilizer with O ratio of 17: 6: 7
320kg of urea and 133kg of potassium chloride
50kg of ammonium sulfate and 100kg of monoammonium phosphate
300kg of special additive for 100kg of calcium superphosphate
The process conditions are as follows: the blast furnace temperature is 350-380 deg.c, the drying kiln head temperature is 140-1602, the kiln tail temperature is 59-61 deg.c, the pelletizing material water content is less than or equal to 6%, and saturated steam pelletizing.
Claims (5)
1. A high-nitrogen urea-based medium-concentration compound fertilizer is characterized in that: the special fertilizer contains monoammonium phosphate, urea, ammonium sulfate, potassium chloride, common calcium and special additive, and the proportion of the fertilizer is N to P2O5∶K2O＝17~20∶5~7∶6~9。
2. The high-nitrogen urine-based medium-concentration compound fertilizer as claimed in claim 1, which is characterized in that: the special additive is prepared from sepiolite, feldspar powder and bentonite, and contains proper amount of Mg2+、Zn2+、Fe2+、B+、Mn2+Trace elements.
3. A method of making the product of the invention, characterized by: the blast furnace temperature is 330-420 deg.c, the drying kiln head temperature is 150-200 deg.c and the kiln tail temperature is 55-65 deg.c.
4. A method of manufacturing the product of the invention according to claim 3, characterized in that: the water content of the granulated material is less than or equal to 6 percent.
5. A method of manufacturing the product of the invention according to claim 3, characterized in that: and (3) granulating by adopting saturated steam.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02114075 CN1453248A (en) | 2002-04-23 | 2002-04-23 | High-nitrogen urine-based medium-concentration composite fertilizer and its production process |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 02114075 CN1453248A (en) | 2002-04-23 | 2002-04-23 | High-nitrogen urine-based medium-concentration composite fertilizer and its production process |
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| CN1453248A true CN1453248A (en) | 2003-11-05 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101265128B (en) * | 2008-04-16 | 2010-08-04 | 江苏华昌化工股份有限公司 | Method for preparing particle nitrogen fertilizer |
| CN103864490A (en) * | 2014-02-20 | 2014-06-18 | 华南农业大学 | Special composite fertilizer for catalpa bungei seedling, and applications thereof |
| WO2014181149A3 (en) * | 2013-05-06 | 2015-03-26 | Saudi Basic Industries Corporation | Fertilizer compositions and methods thereof |
| CN106146137A (en) * | 2016-06-03 | 2016-11-23 | 辽宁东萌肥业科技有限公司 | Long-acting organic-inorganic complex fertilizer of drought-resistant water-preserving and preparation method thereof |
-
2002
- 2002-04-23 CN CN 02114075 patent/CN1453248A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101265128B (en) * | 2008-04-16 | 2010-08-04 | 江苏华昌化工股份有限公司 | Method for preparing particle nitrogen fertilizer |
| WO2014181149A3 (en) * | 2013-05-06 | 2015-03-26 | Saudi Basic Industries Corporation | Fertilizer compositions and methods thereof |
| CN105324351A (en) * | 2013-05-06 | 2016-02-10 | 沙特基础工业公司 | Fertilizer compositions and methods thereof |
| CN103864490A (en) * | 2014-02-20 | 2014-06-18 | 华南农业大学 | Special composite fertilizer for catalpa bungei seedling, and applications thereof |
| CN103864490B (en) * | 2014-02-20 | 2015-12-09 | 华南农业大学 | A kind of Chinese catalpa nursery composite fertilizer special and application thereof |
| CN106146137A (en) * | 2016-06-03 | 2016-11-23 | 辽宁东萌肥业科技有限公司 | Long-acting organic-inorganic complex fertilizer of drought-resistant water-preserving and preparation method thereof |
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