CN101696139B - Method for producing compound fertilizer for fixing nitrogen, dissolving phosphor and dissolving potassium by using spray granulation process - Google Patents
Method for producing compound fertilizer for fixing nitrogen, dissolving phosphor and dissolving potassium by using spray granulation process Download PDFInfo
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Abstract
The invention discloses a method for producing a compound fertilizer for fixing nitrogen, dissolving phosphor and dissolving potassium by using a spray granulation process, comprising the following steps of 1, placing a nitrogen fertilizer, a phosphor fertilizer, a filler and microelements into a mixture machine according to a certain weight ratio for evenly mixing, conveying the mixture to a bucket elevator, raising the mixture to a high-level bin, and evenly putting the mixture into a pelletizer by using a metering belt weight; 2, feeding gel weak liquid to a reactor to carry out mixed reaction with sulfuric acid to generate carbamide gel for later use, wherein the gel weak liquid is prepared by reacting the carbamide with a synergistic agent; 3, taking a neutralized potassium bisulfate slurry for later use; 4, simultaneously spraying the carbamide gel and the potassium bisulfate slurry into the mixture in the pelletizer in the step 1 to carry out mixed granulation; and 5, drying, screening and fluidized bed cooling after mixed granulation and the spray granulation to prepare the compound fertilizer product for fixing nitrogen, dissolving phosphor and dissolving potassium. The composite fertilizer produced in the method ensures that the content of the nitrogen in the composite fertilizer of nitrogen, phosphor and potassium achieves 18 percent to 30 percent, and has functions of fixing nitrogen, decreasing phosphorous and decreasing potassium, difficultly losing nutrients in the fertilization process and improving soil hardening, preserving soil moisture and the like.
Description
Technical field
The present invention relates to the working method of composite fertilizer, is a kind of method that adopts spray granulating explained hereafter compound fertilizer for fixing nitrogen, dissolving phosphor and dissolving potassium.
Background technology
With low temperature conversion spray granulating explained hereafter composite fertilizer; Be directly to combine the production of the production of vitriolate of tartar and nitrogen-phosphorus-potassium compound fertilizer, thereby possessed the advantage that shortens flow process, reduces production costs, though this method has obtained patent right; But; Its deficiency manifests along with the development in market gradually: the ton energy consumption is marked coal at 90-100Kg, and energy consumption is higher, makes the difficult reduction of manufacturing cost; Because this technology nutrient is fixed, regulation range is narrower, can only produce N-P
2O
5-K
2O is the universal composite fertilizer of the wide spectrum about a 15-15-15 kind, and nitrogen content is merely 12-13%, and do not reach the nitrogen of national requirements: phosphorus: potassium is the fertile ratio of 3: 2: 1 use.And this technology provides nitrogen through ammonification in slurry and urea, because this nitrogen mode that adds limits because of processing condition, so the amplitude of raising nitrogen content is restricted.Simultaneously, because do not possess fixed nitrogen, P and K decomposing function,, can not improve soil compaction and soil moisture conservation etc. with the composite fertilizer of this explained hereafter so nutrient is prone to run off in the fertilising process.
Summary of the invention
The objective of the invention is, a kind of method that adopts spray granulating explained hereafter compound fertilizer for fixing nitrogen, dissolving phosphor and dissolving potassium is provided, nitrogen content in the composite fertilizer is increased to 18%-30%, and makes composite fertilizer possess nitrogen-fixating and P and K decomposing functions.
The present invention realizes through following technical scheme for realizing above-mentioned purpose: the method for spray granulating explained hereafter compound fertilizer for fixing nitrogen, dissolving phosphor and dissolving potassium, and its process step is:
1. nitrogenous fertilizer, phosphate fertilizer, filler and trace element are mixed by weight inserting in the compound machine; Compound is transported to chapelet and rises to high-order storehouse; Claimed evenly to put in the tablets press by measuring belt, wherein trace element is zinc or boron or iron, and filler is a calcium salt; The weight ratio of nitrogenous fertilizer, phosphate fertilizer, filler and trace element is: nitrogenous fertilizer: phosphate fertilizer: filler: trace element=33-67: 17-56: 8-20: 0-1;
2. the gel thin liquid being sent into reactor drum and sulfuric acid hybrid reaction, to generate urea gel subsequent use; Said sulfuric acid is the 5%-20% dilute sulphuric acid; Said gel thin liquid is processed by urea and synergistic agent reaction, and the weight ratio of urea and synergistic agent is 0.7-4: 1, and said synergistic agent is formed mixed aqueous solution by 37% formaldehyde solution, Sodium salts humic acids and SAP 73; Its concentration is 30-50%, and the weight ratio of three kinds of components is 10-25: 2-5: 1-2.5;
3. the sal enixum slurry of getting after the neutralization is subsequent use;
4. the urea gel of step described in 2. and the step sal enixum slurry described in is 3. sprayed in the compound in the 1. said tablets press of step simultaneously, feed gas ammonia and continue the reaction mixing granulation;
5. behind the mixing granulation,, form the compound fertilizer for fixing nitrogen, dissolving phosphor and dissolving potassium product of nitrogen content at 18-30% again through the follow-up oven dry of spray granulating, sub-sieve, fluidized-bed cooling method for manufacturing.
Method steps of the present invention 2. described in reaction times of urea and synergistic agent be 30-120 minute, temperature of reaction is that 50-100 ℃, pH value are 7-10, reaction is being processed under constantly stirring.
Nitrogen content in the urea gel according to the invention is 31-40%, and pH value is 3-6.
Urea gel according to the invention sprays in the tablets press, and gas ammonia neutralizes sulfuric acid, and emits heat, provides the material adhesive aggregation granulated temperature.
The weight of compound is for adding the 51%-60% of tablets press total raw material weight in the tablets press of the present invention; The weight of urea gel is for adding the 13-33% of tablets press total raw material weight, and the weight of sal enixum slurry is for adding the 16-33% of tablets press total raw material weight.
Advantage of the present invention is: the composite fertilizer that produces with method of the present invention can make the nitrogen content in the nitrogen-phosphorus-potassium compound fertilizer reach 18%-30%; And can play the effect of fixed nitrogen, phosphorus decomposing, potassium decomposing; Nutrient is difficult for running off in the fertilising process, can improve effects such as soil compaction and soil moisture conservation.The urea gel that uses in the composite fertilizer with the inventive method production is a kind of high molecular polymer that has a large amount of side chain functional groups; Contain a lot of active complexing groups, can with nutrient ion, micro-ionic bond, nutrient is had extremely strong inrichment; Suction forms gelating soln in soil simultaneously; Can hold the storage nutrient, be convenient to crop and absorb, improve plant recovery of nutrient; Therefore, the composite fertilizer of the inventive method production also has functions such as the water saving joint is fertile, drought resisting is waterlogging, also can increase organic content, loosen and improve the soil, eliminate characteristics such as hardening, promote crop growth, raising agricultural product quality and output.
The formaldehyde solution of adding in the composite fertilizer with the inventive method production; Be prone to and urea generation condensation, polyreaction; Under the ratio of controlling pH value, temperature, urea and formaldehyde solution and the condition in reaction times, pass through formaldehyde solution and excessive urea reaction; Form water soluble mixt (being reacting slurry) earlier, in these mixtures, add acid and then produce condensation chain length, water-soluble lower oligomer, being released into of the long more nitrogen of chain is just slow more.Thereby the present invention is through the ratio of control urea and formaldehyde solution, the composition of reaction conditions system reaction product, and the speed of the solubleness of control reaction product and nitrogen release.Composite fertilizer's nitrogen of producing with the inventive method discharges slowly, fertilizer efficiency period prolongs, utilization ratio improves, reduced the devolatilization and the water-soluble loss of nitrogen, and the composite fertilizer that therefore produces with the inventive method has good nitrogen fixation effect.
Because the content of China's soil available phosphorus is lower, the phosphorus in most of soil is fixed by soil, forms the form that plant can't directly absorb.The humic acid that the composite fertilizer that produces with the inventive method adds is a kind of organic acidity material; The form that can make the insoluble phosphorus that is fixed in the soil such as tertiary iron phosphate, phosphagel phosphaljel and organic phosphoric acid thing mineralising become plants such as titanium pigment such as hydrogen phosphate to absorb, thus reach the effect of phosphorus decomposing.
Because north China is a dryland soil, potassium element is mainly by soil fixing, and the soil available potassium is lost with current mostly in the paddy field in the south and the north, causes the shortage of available potassium.The said potassium decomposing of composite fertilizer that the inventive method is produced is that the slow property potassium in the soil is discharged, and effective potassium that can will run off easily simultaneously is adsorbed near the root system, for crop utilization.Therefore, utilize organic acid to promote the release of soil potassium, the metals ion in micromolecular organic acid and the mineral structure forms metal-organic complex, and quicken mineral and decompose, and the H in the organic acid
+Can partly displace by fixed K in soil colloid absorption and the lattice
+Thereby, promote the release of potassium, play the effect of potassium decomposing; The composite fertilizer that the inventive method is produced is equivalent in soil, add humic acid, can soil mineral property potassium be discharged, and simultaneously nutritive elements such as soluble potassium is adsorbed onto around the root system of plant; The confession plant absorbing is utilized, in order to avoid nutrient loss.The humic acid that uses not only has very strong surge capability to soda acid; And a large amount of electric charges of being produced when dissociating of acid group; It is fixing by the absorption of soil mineral colloid to reduce nutrient ion such as some micronutrient elements on the one hand; Can avoid the nutrient ion to lose on the other hand, can also keep the nutrient ion to be in water soluble state simultaneously, so that the plant absorbing utilization with current.Humic acid also has very strong complexing and sequestering power, can combine with metals ion, and its biological effectiveness is produced remarkable influence, but humic acid stimulating plant root growth also improves the ability that root system absorbs soil nutrient.And have powerful sticking moisture property, can be used as plant drought-resisting agent.Under drought stress, humic acid can obviously reduce the transpiration rate of blade, reduces the plant evapotranspiration, improves root system vigor, leaf water potential and Net Photosynthetic Rate, increases the offspring ratio, thereby effectively improves the plant water regime, improves drought resistance and yield and quality thereof.
In order further to increase the effect of the composite fertilizer that produces with the inventive method, the SAP 73 of use is a kind of proteinaceous material of long-chain that has, and a lot of carboxyls are arranged on its protein chain, contains a lot of complexing groups around the chain; Have extremely strong sequestering action with the metals ion in the fertilizer, can with the nutrient ionic bond, add the one-tenth ring property of complexing group; Nutrient there is extremely strong inrichment, thereby the fertile function of good joint is arranged, can also promote the root system development growth of crop; Improve crop immunizing power, strengthen resistance, improve the soil; Reduce rate of fertilizer, improve condiments output, improve crop quality.
The composite fertilizer that produces with the inventive method shows respond well through strict field district test, field experiment is summed up as follows:
In October, 2006, the contriver entrusts Chinese Academy of Agricultural Sciences's resource and Research on zoning to do the effect experiment of a series of these compound fertilizer for fixing nitrogen, dissolving phosphor and dissolving potassium material on winter wheat.Linyi City Mei Bu carries out in the town in the Shandong Province in test, and experimental field soil type is a moisture soil, and the topsoil quality is light earth, soil organism 10.32g/kg, available nitrogen 70.5mg/kg, rapid available phosphorus (P
2O
5) 14.3mg/kg, available potassium (K
2O) 92mg/kg.Test contrasts with the identical foster part of common compound manure of content with compound fertilizer for fixing nitrogen, dissolving phosphor and dissolving potassium.
Compare with common compound manure; 100% compound fertilizer for fixing nitrogen, dissolving phosphor and dissolving potassium is handled and decrement 20% compound fertilizer for fixing nitrogen, dissolving phosphor and dissolving potassium processing winter wheat mu spike number increases by 18.04% and 10.68% respectively, and decrement 40% compound fertilizer for fixing nitrogen, dissolving phosphor and dissolving potassium is handled then and handled basic identical with common composite fertilizer.This explanation, improving rate of tillering panicle, increasing the mu spike number is the major reason that the compound fertilizer for fixing nitrogen, dissolving phosphor and dissolving potassium material is realized the winter wheat high yield.
Table 1 different treatment winter wheat mu spike number (ten thousand/mu) cartogram
| Handle | I | II | III | MV | ±％ |
| 1. contrast | 30.20 | 29.70 | 29.40 | 29.77 | |
| 2. fixed nitrogen fertilizer | 35.61 | 35.21 | 34.59 | 35.14 | 18.04 |
| 3. decrement 20% | 33.63 | 32.20 | 33.01 | 32.95 | 10.68 |
| 4. decrement 40% | 29.82 | 30.04 | 28.97 | 29.61 | -0.54 |
On the other hand; The compound fertilizer for fixing nitrogen, dissolving phosphor and dissolving potassium material is handled under the situation that significantly improves wheat mu spike number; Indexs such as its grain number per spike, thousand seed weight do not show obvious reduction, have explained that the compound fertilizer for fixing nitrogen, dissolving phosphor and dissolving potassium material has certain promotion to raising winter wheat grain number per spike, thousand seed weight yet.
Table 2 different treatment wheat grains per spike is measured the result
| Handle | I | II | II | MV |
| 1. contrast | 45.30 | 44.61 | 44.16 | 44.69 |
| 2. fixed nitrogen fertilizer | 44.82 | 43.50 | 45.34 | 44.55 |
| 3. decrement 20% | 44.77 | 44.61 | 44.14 | 44.51 |
| 4. decrement 40% | 43.26 | 44.05 | 44.63 | 43.98 |
Test-results shows that the compound fertilizer for fixing nitrogen, dissolving phosphor and dissolving potassium material has extremely significant production-increasing function to winter wheat.Compare winter wheat raising the output 20.25% under the same amount condition with common compound manure; Under decrement 20% condition, the compound fertilizer for fixing nitrogen, dissolving phosphor and dissolving potassium material still can increase production 9.79%; When decrement 40% fertilizer amount, winter wheat yields and common compound manure are handled quite.
Embodiment
Method of the present invention is after improving on the basis of existing spray granulating production technique, to have produced a kind of new fixed nitrogen to fall phosphorus and fall K composite fertilizer.Illustrative example is following:
1, the process step of the method for the invention is:
1. urea, monoammonium phosphate, calcium salt powder and zinc sulfate are obtained compound by weight inserting to mix in the compound machine; Compound is transported to chapelet rises to high-order storehouse; Claim evenly to put in the tablets press urea 200kg wherein, monoammonium phosphate 280kg by measuring belt; Calcium salt powder 120kg, zinc sulfate 1kg;
2. the gel thin liquid being sent into reactor drum and sulfuric acid hybrid reaction, to generate urea gel subsequent use; Said sulfuric acid is 5%20% dilute sulphuric acid; Said gel thin liquid is processed by urea and synergistic agent reaction, and the weight ratio of urea and synergistic agent is 0.7-4: 1; Said synergistic agent is formed mixed aqueous solution by 37% formaldehyde solution, Sodium salts humic acids and SAP 73, and the weight ratio of three kinds of components is 10-25: 2-5: 1-2.5; Concrete preparation method is: synergistic agent produce for: get 37% formaldehyde solution, Sodium salts humic acids and SAP 73 and mix according to 10: 2: 2.5 weight ratio and process synergistic agent; Producing of urea gel: get urea granules and synergistic agent and mix according to 0.7: 1 weight ratio, under 80 ℃ of temperature, 70 minutes reaction times, PH is 9; Obtain the gel thin liquid under constantly stirring; Gel thin liquid and 10% dilute sulphuric acid inserted in the reactor drum react, regulating pH value is 3, obtains urea gel;
3. get in the sal enixum subsequent use with slurry 280kg;
4. get the urea gel 130kg of step described in 2. and step 3. in the sal enixum slurry of 280kg spray into simultaneously in the tablets press, feed gas ammonia and continue mixing granulation;
5. behind the mixing granulation, through the follow-up oven dry of spray granulating, sub-sieve, fluidized-bed cooling and packaged for processing method, form the compound fertilizer for fixing nitrogen, dissolving phosphor and dissolving potassium product of nitrogen content again at 18-30%.
The compound manure composition N-P that aforesaid method is produced
2O
5-K
2O is 18-14-8.
2, the process step of the method for the invention is:
1. urea, monoammonium phosphate, calcium salt powder and borax are obtained compound by weight inserting to mix in the compound machine; Compound is transported to chapelet rises to high-order storehouse; Claim evenly to put in the tablets press urea 190kg wherein, monoammonium phosphate 300kg by measuring belt; Calcium salt powder 40kg, borax 1kg;
2. the gel thin liquid being sent into reactor drum and sulfuric acid hybrid reaction, to generate urea gel subsequent use; Said sulfuric acid is the 5%-20% dilute sulphuric acid; Said gel thin liquid is processed by urea and synergistic agent reaction, and the weight ratio of urea and synergistic agent is 0.7-4: 1; Said synergistic agent is formed mixed aqueous solution by 37% formaldehyde solution, Sodium salts humic acids and SAP 73, and the weight ratio of three kinds of components is 10-25: 2-5: 1-2.5; Concrete preparation method is: synergistic agent produce for: get 37% formaldehyde solution, Sodium salts humic acids and SAP 73 and mix according to 10: 3: 1.5 weight ratio and process synergistic agent; Producing of urea gel: get urea granules and synergistic agent and mix according to 1.8: 1 weight ratio, under 90 ℃ of temperature, 90 minutes reaction times, pH value is 8; Obtain the gel thin liquid under constantly stirring; Gel thin liquid and 20% dilute sulphuric acid inserted in the reactor drum react, regulating pH value is 4, obtains urea gel;
3. get in the sal enixum subsequent use with slip 350kg;
4. get the urea gel 165kg of step described in 2. and step 3. in the sal enixum slurry of 350kg spray into simultaneously in the tablets press, feed gas ammonia and continue mixing granulation;
5. behind the mixing granulation, through working methods such as the follow-up oven dry of spray granulating, sub-sieve, fluidized-bed cooling and packings, form the compound fertilizer for fixing nitrogen, dissolving phosphor and dissolving potassium product of nitrogen content again at 18-30%.
The compound manure composition N-P that aforesaid method is produced
2O
5-K
2O is 20-15-10.
3, the process step of the method for the invention is:
1. urea, monoammonium phosphate, calcium salt powder and ferrous sulfate are obtained compound by weight inserting to mix in the compound machine; Compound is transported to chapelet rises to high-order storehouse; Claim evenly to put in the tablets press urea 240kg wherein, monoammonium phosphate 200kg by measuring belt; Calcium salt powder 100kg, ferrous sulfate 1kg;
2. the gel thin liquid being sent into reactor drum and sulfuric acid hybrid reaction, to generate urea gel subsequent use; Said sulfuric acid is the 5%-20% dilute sulphuric acid; Said gel thin liquid is processed by urea and synergistic agent reaction, and the weight ratio of urea and synergistic agent is 0.7-4: 1; Said synergistic agent is formed mixed aqueous solution by 37% formaldehyde solution, Sodium salts humic acids and SAP 73, and the weight ratio of three kinds of components is 10-25: 2-5: 1-2.5; Concrete preparation method is: synergistic agent produce for: get 37% formaldehyde solution, Sodium salts humic acids and SAP 73 and mix according to 10: 4: 1 weight ratio and process synergistic agent; Producing of urea gel: get urea granules and synergistic agent and mix according to 2.3: 1 weight ratio, under 50 ℃ of temperature, 100 minutes reaction times, PH is 10; Obtain the gel thin liquid under constantly stirring; Gel thin liquid and 5% dilute sulphuric acid inserted in the reactor drum react, regulating pH value is 5, obtains urea gel;
3. get in the sal enixum subsequent use with slip 180kg;
4. get the urea gel 350kg of step described in 2. and step 3. in the sal enixum slurry of 180kg spray into simultaneously in the tablets press, feed gas ammonia and continue mixing granulation;
5. behind the mixing granulation, through working methods such as the follow-up oven dry of spray granulating, sub-sieve, fluidized-bed cooling and packings, form the compound fertilizer for fixing nitrogen, dissolving phosphor and dissolving potassium product of nitrogen content again at 18-30%.
The compound manure composition N-P that aforesaid method is produced
2O
5-K
2O is 25-10-5.
4, the process step of the method for the invention is:
1. urea, monoammonium phosphate, calcium salt powder and zinc sulfate are obtained compound by weight inserting to mix in the compound machine; Compound is transported to chapelet rises to high-order storehouse; Claim evenly to put in the tablets press urea 400kg wherein, monoammonium phosphate 100kg by measuring belt; Calcium salt powder 100kg, zinc sulfate 1kg;
2. the gel thin liquid being sent into reactor drum and sulfuric acid hybrid reaction, to generate urea gel subsequent use; Said sulfuric acid is the 5%-20% dilute sulphuric acid; Said gel thin liquid is processed by urea and synergistic agent reaction, and the weight ratio of urea and synergistic agent is 0.7-4: 1; Said synergistic agent is formed mixed aqueous solution by 37% formaldehyde solution, Sodium salts humic acids and SAP 73, and the weight ratio of three kinds of components is 10-25: 2-5: 1-2.5; Concrete preparation method is: synergistic agent produce for: get 37% formaldehyde solution, Sodium salts humic acids and SAP 73 and mix according to 10: 5: 2 weight ratio and process synergistic agent; Producing of urea gel: get urea granules and synergistic agent and mix according to 4: 1 weight ratio, under 100 ℃ of temperature, 30 minutes reaction times, pH value is 6; Obtain the gel thin liquid under constantly stirring; Gel thin liquid and 20% dilute sulphuric acid inserted in the reactor drum react, regulating pH value is 6, obtains urea gel.
3. get in the sal enixum subsequent use with slip 170kg;
4. get the urea gel 300kg of step described in 2. and step 3. in the sal enixum slurry of 170kg spray into simultaneously in the tablets press, feed gas ammonia and continue mixing granulation;
5. behind the mixing granulation, through working methods such as the follow-up oven dry of spray granulating, sub-sieve, fluidized-bed cooling and packings, form the compound fertilizer for fixing nitrogen, dissolving phosphor and dissolving potassium product of nitrogen content again at 18-30%.
The compound manure composition N-P that aforesaid method is produced
2O
5-K
2O
5Be 30-5-5.
Detailed description is all not identical with the technology of producing nitrogen-phosphorus-potassium compound fertilizer with the spray granulating method in the inventive method.
Sal enixum slurries of the present invention are that 98% vitriol oil and Repone K react in the low temperature conversion device and obtains, and temperature of reaction 100-140 ℃, the part by weight of the vitriol oil and Repone K is 1.50-1.71: 1.
Nitrogen content in the urea gel of the present invention is 31-40%, and pH value is 3-6.Urea gel sprays in the tablets press, and gas ammonia neutralizes sulfuric acid, and emits heat, provides material to gather granulated temperature.
The weight of compound is for adding the 51%-60% of tablets press total raw material weight in the tablets press of the present invention; The weight of urea gel is for adding the 13-33% of tablets press total raw material weight, and the weight of sal enixum slurry is for adding the 16-33% of tablets press total raw material weight.
Claims (4)
1. the method for spray granulating explained hereafter compound fertilizer for fixing nitrogen, dissolving phosphor and dissolving potassium, it is characterized in that: its process step is:
1. nitrogenous fertilizer, phosphate fertilizer, filler and trace element are mixed by weight inserting in the compound machine; Compound is transported to chapelet and rises to high-order storehouse; Claimed evenly to put in the tablets press by measuring belt, wherein trace element is zinc or boron or iron, and filler is a calcium salt; The weight ratio of nitrogenous fertilizer, phosphate fertilizer, filler and trace element is: nitrogenous fertilizer: phosphate fertilizer: filler: trace element=33-67:17-56:8-20:0-1;
2. the gel thin liquid being sent into reactor drum and sulfuric acid hybrid reaction, to generate urea gel subsequent use; Said sulfuric acid is the 5%-20% dilute sulphuric acid; Said gel thin liquid is processed by urea and synergistic agent reaction, and the weight ratio of urea and synergistic agent is 0.7-4:1, and said synergistic agent is formed mixed aqueous solution by 37% formaldehyde solution, Sodium salts humic acids and SAP 73; Its concentration is 30-50%, and the weight ratio of three kinds of components is 10-25:2-5:1-2.5;
3. the sal enixum slurry of getting after the neutralization is subsequent use;
4. the urea gel of step described in 2. and the step sal enixum slurry described in is 3. sprayed in the compound in the 1. said tablets press of step simultaneously, feed gas ammonia and continue the reaction mixing granulation;
5. behind the mixing granulation,, form the compound fertilizer for fixing nitrogen, dissolving phosphor and dissolving potassium product of nitrogen content at 18-30% again through the follow-up oven dry of spray granulating, sub-sieve, fluidized-bed cooling method for manufacturing;
The weight of compound is for adding the 51%-60% of tablets press total raw material weight in the described tablets press, and the weight of urea gel is for adding the 13-33% of tablets press total raw material weight, and the weight of sal enixum slurry is for adding the 16-33% of tablets press total raw material weight.
2. the method for spray granulating explained hereafter compound fertilizer for fixing nitrogen, dissolving phosphor and dissolving potassium according to claim 1; It is characterized in that: step 2. described in reaction times of urea and synergistic agent be 30-120 minute; Temperature of reaction is that 50-100 ℃, pH value are 7-10, and reaction is being processed under constantly stirring.
3. the method for spray granulating explained hereafter compound fertilizer for fixing nitrogen, dissolving phosphor and dissolving potassium according to claim 1 is characterized in that: the nitrogen content in the urea gel is 31-40%, and pH value is 3-6.
4. the method for spray granulating explained hereafter compound fertilizer for fixing nitrogen, dissolving phosphor and dissolving potassium according to claim 1 is characterized in that: urea gel sprays in the tablets press, and gas ammonia neutralizes sulfuric acid, and emits heat, provides the material adhesive aggregation granulated temperature.
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| CN102079678B (en) * | 2010-12-31 | 2013-10-16 | 邳州市金大地肥料有限公司 | Garlic special compound fertilizer containing aspartate and preparation method thereof |
| CN102241545A (en) * | 2011-03-09 | 2011-11-16 | 山东远东国际生物化工股份有限公司 | Process for producing polypeptide composite fertilizer by using ammonia-acid method |
| CN103804092B (en) * | 2014-02-24 | 2016-01-20 | 华强化工集团股份有限公司 | Sugarcane special-purpose fertilizer material and preparation method thereof |
| CN104844311B (en) * | 2015-03-31 | 2016-03-02 | 山东省林业科学研究院 | A kind of matrix and method improving drought and barren survival rate in forestation in mountainous areas |
| CN114984851A (en) * | 2022-06-27 | 2022-09-02 | 河南豫能化肥有限公司 | Method and device for manufacturing granular fertilizer by secondary guniting |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1128247A (en) * | 1995-10-12 | 1996-08-07 | 湖南省郴州化肥总厂 | Continuous production method of potassium sulphate type ternary granulated complex fertilizer by using potassium chloride |
| CN1491924A (en) * | 2002-10-25 | 2004-04-28 | 中国科学院沈阳应用生态研究所 | Humic acid long-acting compound fertilizer and its preparing method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1128247A (en) * | 1995-10-12 | 1996-08-07 | 湖南省郴州化肥总厂 | Continuous production method of potassium sulphate type ternary granulated complex fertilizer by using potassium chloride |
| CN1491924A (en) * | 2002-10-25 | 2004-04-28 | 中国科学院沈阳应用生态研究所 | Humic acid long-acting compound fertilizer and its preparing method |
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