CN1291945C - Long-acting urea, and its prepn. method - Google Patents
Long-acting urea, and its prepn. method Download PDFInfo
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- CN1291945C CN1291945C CNB2005100469087A CN200510046908A CN1291945C CN 1291945 C CN1291945 C CN 1291945C CN B2005100469087 A CNB2005100469087 A CN B2005100469087A CN 200510046908 A CN200510046908 A CN 200510046908A CN 1291945 C CN1291945 C CN 1291945C
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- quinhydrones
- dicyanodiamide
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Abstract
The present invention relates to long acting urea. Wood dust or activated flyash belonging to one of two natural waste materials is used as a main carrier, and hydroquinone, dicyandiamide and urea are added, wherein the long acting urea has the ingredients according to the proportion by weight: 10% to 30% of wood dust or activated flyash, 0.01% to 0.1% of hydroquinone, 0.02% to 0.3% of dicyandiamide and 69.97% to 89.6% of urea. The long acting urea is mainly prepared according to the following three steps that step 1, the wood dust of 80 meshes or the activated flyash of more than 100 meshes and a urea melting solution are thoroughly mixed and uniformly stirred; step 2, the hydroquinone and the dicyandiamide are respectively prepared to be 10 % of water solution; step 3, the water solution prepared in step 2 is sprayed into the middle part of a prilling tower. The present invention is mainly characterized in that furnace dust slag and sawn wood dust as waste materials from a thermal power plant or a boiler are utilized, so the cost is low, and the sources are abundant. The present invention has the advantages that the utilization rate of the urea can be obviously enhanced, the fertilizer effect period is extended, the cost is reduced, the soil environment is not polluted, the toxic hazard does not exist, the efficiency is high, and the environment is protected.
Description
The present invention is a kind of chemical fertilizer.Specifically, be a kind ofly to discharge the waste material boiler ash sediment as long-acting carbamide of carrier (sorbent material) and preparation method thereof with natural wastes wood chip, boiler.
Background technology: urea occupies critical role in China's agriculture production.The amount of urea of China accounts for first place, the world, but utilization ratio is lower than world average level, has only 30%～35%.Its one of the main reasons is that nutrient discharges soon, loses by forms such as volatilization, leaching losses in soil.Therefore, how to slow down the rate of decomposition of urea in soil, improve validity, improve the utilization ratio of urea, become the long-term problem of paying close attention to both at home and abroad crop.
Because ubiquity ureaclastic urase in the soil, urea enters to decompose under the effect of soil urease behind the soil and discharges amine NH
4 +Ion, and absorbed by crop, but because can not produce the burning seedling and cause more nitrogen volatilization loss by the whole absorptions of crop and to crop seedling immediately, and bring contaminate environment.Therefore, a lot of to the research of slow release long-acting chemical fertilizer both at home and abroad.Countries in the world are very fast to the progress of urease inhibitor in recent years, add a certain amount of urease inhibitor such as quinhydrones in urea, and the nitrification inhibitor Dyhard RU 100 etc., be that nitric nitrogen is obtained certain achievement to alleviating urea decomposition and stoping the nitrogen transformation of amine attitude.But the attention of most technology concentrates on and improves fertilizer efficiency, increase fertilizer utilization ratio, has ignored fertilizer is continued to use to improving soil environment quality, improve the soil comprehensive fertility, alleviate soil pollution, the consideration of protection agroecological environment aspect.
Summary of the invention: the objective of the invention is provides a kind of raw material sources extensive at the problems referred to above, can improve the urea utilization ratio, prolongs fertilizer efficiency period, reduces cost, to free of contamination long-acting carbamide of edatope and production technique thereof.The present invention is achieved through the following technical solutions: long-acting carbamide, be with two kinds of natural wastes wood chips or activating fly ash as main carrier, add quinhydrones, Dicyanodiamide, urea again.The content of each component (weight %) wherein: wood chip or activating fly ash 10%～30%; Quinhydrones 0.01%～0.1%; Dicyanodiamide 0.02%～0.3%; Urea 69.97%～89.6%.
Long-acting carbamide is mainly by following three steps preparation:
Step 1: the above activating fly ash of 80 order wood chips according to a certain ratio or 100 orders mixes fully with urea melting liquid and stirs evenly;
Step 2: quinhydrones and Dicyanodiamide be mixed with 10% the aqueous solution respectively;
Step 3: the aqueous solution of the quinhydrones that makes and Dicyanodiamide is ejected into the prilling tower middle part.
Among the above-mentioned preparation technology, wood chip is handled: pulverized 80 mesh sieves.Flyash is handled: boiler ash sediment was pulverized 100 mesh sieves, and 400 ℃ of activation of high temperature promptly got activating fly ash in two hours in muffle furnace.
Above-mentioned raw materials wood chip (especially wood sawdust) wide material sources, its surface irregularity, voidage is big, general porosity 80.8%, the ventilating slit reaches 42.6%.Have the intensive adsorptive power, mix, urea and degradation production NH thereof with urea melting liquid
4 +Ion is attracted in the hole, thereby slowly discharges, and improves the fertilizer efficiency and the utilization ratio of urea.Wood chip has loose ventilative, preserve moisture and fertility ability simultaneously.In addition, wood chip itself can decompose organic acid, can improve alkaline soil, decomposes the humic acid that produces and can also increase soil fertility.Therefore selecting this natural wastes of wood sawdust for use is a kind of extraordinary approach as a kind of synergistic agent of urea.
Above-mentioned activating fly ash is that the broken activation back of sieving of heat power plant or es ground-slag forms, and its surface channel is opened, and has the intensive adsorptive power, to urea and degradation production NH thereof
4 +In its passage of ionic adsorption, urea had slow releasing function; Improve the fertilizer efficiency and the utilization ratio of urea.Flyash contains various trace elements in addition, can improve crop disease-resistant evil ability, and flyash has ventilation property simultaneously, can improve the soil.
Maximum characteristics of the present invention are that not only cost is very low, and raw material sources are extensive with heat power plant or es slag and wood sawdust utilization of waste material, can obviously improve the urea utilization ratio, prolong fertilizer efficiency period, reduce cost,, toxicological harmless pollution-free, high-efficiency environment friendly edatope.
Description of drawings:
Fig. 1 is preparation method's schema of the present invention (block diagram).
Embodiment:
With reference to Fig. 1, after wood chip or boiler ash sediment pulverized in pulverizer, wood chip was crossed 80 mesh sieves, and boiler ash sediment is crossed the 400 ℃ of activation of high temperature in muffle furnace of 100 mesh sieves and made activating fly ash in two hours.Send into the mixing tank mixing by metering conveyor then, at this moment, urea melting liquid metering Liquid spraying pump sprays in mixing tank, enters the prilling tower granulation behind the spray, promptly gets product after quinhydrones and Dicyanodiamide meter injection device spray in prilling tower.1-4 among the figure is the priority of step.
Embodiment 1:
Long-acting carbamide, by following raw material by weight % make: quinhydrones 0.1%; Dicyanodiamide 0.3%; Wood chip 10%; Urea 89.6%.
Embodiment 2:
Long-acting carbamide, by following raw material by weight % make: quinhydrones 0.01%; Dicyanodiamide 0.02%; Wood chip 15%; Urea 84.97%.
Embodiment 3:
Long-acting carbamide, by following raw material by weight % make: quinhydrones 0.01%; Dicyanodiamide 0.02%; Wood chip 20%; Urea 79.97%.
Embodiment 4:
Long-acting carbamide, by following raw material by weight % make: quinhydrones 0.01%; Dicyanodiamide 0.02%; Wood chip 25%; Urea 74.97%.
Embodiment 5:
Long-acting carbamide, by following raw material by weight % make: quinhydrones 0.01%; Dicyanodiamide 0.02%; Wood chip 30%; Urea 69.97%.
Embodiment 6:
Long-acting carbamide, by following raw material by weight % make: quinhydrones 0.1%; Dicyanodiamide 0.3%; Flyash 10%; Urea 89.6%.
Embodiment 7:
Long-acting carbamide, by following raw material by weight % make: quinhydrones 0.01%; Dicyanodiamide 0.02%; Flyash 15%; Urea 84.97%.
Embodiment 8:
Long-acting carbamide, by following raw material by weight % make: quinhydrones 0.01%; Dicyanodiamide 0.02%; Flyash 20%; Urea 79.97%.
Embodiment 9:
Long-acting carbamide, by following raw material by weight % make: quinhydrones 0.01%; Dicyanodiamide 0.02%; Flyash 25%; Urea 74.97%.
Embodiment 10:
Long-acting carbamide, by following raw material by weight % make: quinhydrones 0.01%; Dicyanodiamide 0.02%; Flyash 30%; Urea 69.97%.
Embodiment 11:
Long-acting carbamide, by following raw material by weight % make: quinhydrones 0.05%; Dicyanodiamide 0.15%; Flyash 28%; Urea 71.8%.
Embodiment 12:
Long-acting carbamide, by following raw material by weight % make: quinhydrones 0.03%; Dicyanodiamide 0.1%; Flyash 23%; Urea 76.87%.
The method for preparing embodiment 1-12 is by following three steps:
Step 1: the above activating fly ash of 80 order wood chips according to a certain ratio or 100 orders mixes fully with urea melting liquid and stirs evenly;
Step 2: quinhydrones and Dicyanodiamide be mixed with 10% the aqueous solution respectively;
Step 3: the quinhydrones that step 2 is made and the aqueous solution of Dicyanodiamide are ejected into the prilling tower middle part.The concrete grammar step is undertaken by schema.
Equipment related in the above-mentioned technology all adopts conventional equipment.
Claims (10)
1, a kind of long-acting carbamide, it is characterized in that it be with two kinds of natural wastes wood chips or activating fly ash as main carrier, add quinhydrones, Dicyanodiamide, urea again, wherein the content of each component by weight % make: wood chip or activating fly ash 10%～30%; Quinhydrones 0.01%～0.1%; Dicyanodiamide 0.02%～0.3%; Urea 69.97%～89.6%.
2, long-acting carbamide according to claim 1, the concrete consumption that it is characterized in that it be by following raw material by weight % make: quinhydrones 0.1%; Dicyanodiamide 0.3%; Wood chip 10%; Urea 89.6%.
3, long-acting carbamide according to claim 1, the concrete consumption that it is characterized in that it be by following raw material by weight % make: quinhydrones 0.01%; Dicyanodiamide 0.02%; Wood chip 15%; Urea 84.97%.
4, long-acting carbamide according to claim 1, the concrete consumption that it is characterized in that it be by following raw material by weight % make: quinhydrones 0.01%; Dicyanodiamide 0.02%; Wood chip 20%; Urea 79.97%.
5, long-acting carbamide according to claim 1, the concrete consumption that it is characterized in that it be by following raw material by weight % make: quinhydrones 0.01%; Dicyanodiamide 0.02%; Wood chip 25%; Urea 74.97%.
6, long-acting carbamide according to claim 1, the concrete consumption that it is characterized in that it be by following raw material by weight % make: quinhydrones 0.01%; Dicyanodiamide 0.02%; Wood chip 30%; Urea 69.97%.
7, long-acting carbamide according to claim 1, the concrete consumption that it is characterized in that it be by following raw material by weight % make: quinhydrones 0.1%; Dicyanodiamide 0.3%; Flyash 10%; Urea 89.6%.
8, long-acting carbamide according to claim 1, the concrete consumption that it is characterized in that it be by following raw material by weight % make: quinhydrones 0.01%; Dicyanodiamide 0.02%; Flyash 15%; Urea 84.97%.
9, long-acting carbamide according to claim 1, the concrete consumption that it is characterized in that it be by following raw material by weight % make: quinhydrones 0.01%; Dicyanodiamide 0.02%; Flyash 20%; Urea 79.97%.
10, the method for preparation long-acting carbamide as claimed in claim 1 is characterized in that it is mainly by following three steps preparation:
Step 1: the above activating fly ash of 80 order wood chips according to a certain ratio or 100 orders mixes fully with urea melting liquid and stirs evenly;
Step 2: quinhydrones and Dicyanodiamide be mixed with 10% the aqueous solution respectively;
Step 3: the quinhydrones that step 2 is made and the aqueous solution of Dicyanodiamide are ejected into the prilling tower middle part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100469087A CN1291945C (en) | 2005-07-21 | 2005-07-21 | Long-acting urea, and its prepn. method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100469087A CN1291945C (en) | 2005-07-21 | 2005-07-21 | Long-acting urea, and its prepn. method |
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| CN1757619A CN1757619A (en) | 2006-04-12 |
| CN1291945C true CN1291945C (en) | 2006-12-27 |
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| CNB2005100469087A Expired - Fee Related CN1291945C (en) | 2005-07-21 | 2005-07-21 | Long-acting urea, and its prepn. method |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101492310B (en) * | 2008-01-22 | 2012-11-14 | 中国农业科学院农业资源与农业区划研究所 | Composite sustained-release urea of organic materials and method of producing the same |
| RU2443664C1 (en) * | 2010-07-20 | 2012-02-27 | Иван Федотович Потерянко | Method of producing organomineral fertiliser |
| CN106376473A (en) * | 2016-08-31 | 2017-02-08 | 南京国龙生物科技有限公司 | Preparation method of economic environment-friendly biological fermenting bed suitable for breeding pigs |
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Granted publication date: 20061227 Termination date: 20100721 |