CN102701846A - Method for controlling content of biuret in compound fertilizers for melt granulation in prilling tower - Google Patents
Method for controlling content of biuret in compound fertilizers for melt granulation in prilling tower Download PDFInfo
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Abstract
The invention provides a method for controlling the content of biuret in compound fertilizers for melt granulation in a prilling tower. A low melting point mixture is formed by urea and compounds in a melting tank, and is melted completely at the temperature ranging from 104 to 114 DEG C; nitrogen fertilizers, phosphate fertilizers, potash fertilizers, fillers and trace elements are used for melting urine and production compound fertilizers and are added in a mixer according to product demand ratios, are premixed rapidly under the temperature condition ranging from 90 to 110 DEG C, then are mixed through a slurry emulsifying machine at a high speed so as to form emulsified slurry, and then are processed through the procedures such as granulation, cooling sieving and the like in the prilling tower so as to produce the granular compound fertilizers with low content of biuret; in addition, the content of biuret in the compound fertilizers that are produced by adopting the method is less than 0.6 percent, the quality is safe, and fertilizer damages cannot be caused. The method belongs to a novel environment-friendly production method with low consumption, which can produce the granular compound fertilizers on the basis of urea-based prilling tower melt granulation technology.
Description
Technical field
The present invention relates to the control method of Biuret Content in a kind of high tower fused melt granulated compound fertilizer material.
Background technology
The urine base is high tower fused melt granulated to be liquid phase with the urea melting, forms with other pulverulent material and mixes the solid solution mixed system entering high tower pellatizer machine sprinkling granulating that forms good fluidity, forms high tower compound fertilizer.Because having determined in its production fusion, mixing process, to be prone to polycondensation, the physico-chemical property of urea self is formed with the harmful substances biuret; Add that composite fertilizer (compound manure) national standard (GB15063-2009) does not all explicitly call for the biuret index; The biuret index is not essential items for inspection; Therefore pay close attention to very few to the control of biuret index; Especially with the compound manure of high tower fused melt granulated explained hereafter, its Biuret Content all is higher than 1.0%, the report that exceeds standard and harm the crops because of biuret often occurs.
In existing high tower fused melt granulated production compound fertilizer technology technology; The overwhelming majority all adopts behind the finished urea second melting other powder of liquid-phase mixing as fused mass granulating; Because biuret of agricultural urea itself high (1.0%～1.5%) and fusion need reach certain temperature (125 ℃～132.7 ℃) and time, so manage to reduce prilling temperature, reduce the residence time, reduce the main means that amount of urea becomes the generation of control biuret.The Repone K and the urea that generally adopt at present form two-dimentional lower melting point system, and its fusing point can be reduced to about 125 ℃, but cooling extent is limited; Realize the complete uniform mixing of solid-liquid phase; Must guarantee that amount of liquid phase (amount of urea) can not be less than 35% (quality); Cross low amount of liquid phase or prilling temperature and be unfavorable for that all the thorough mixing of molten urea solution and powder is even, cause not well-mixed particle plugging prilling spry and influence normal continuous production.
Some producer; Directly utilize the molten urea solution of urea plant to produce compound manure, seemingly reduce the second melting of urea outwardly, reduce the generation of biuret; But the urine of coming because of urea plant is pure urea liquation; Temperature is all on the fusing point (132.7 ℃) of urea, and the pipe-line transportation of long distance and the insulation of the warming and pressurizing in the pipe conveying procedure all creating conditions for biuret produces, and is higher with the compound manure Biuret Content of this method production.
Summary of the invention
The present invention is intended to overcome the defective that exists in the above-mentioned technology; The control method of Biuret Content in a kind of high tower fused melt granulated compound fertilizer material is provided, produces and contain the required nitrogen of farm crop, phosphorus, the foster element of three kinds of main managements of potassium and the low biuret of other trace element, efficient, safe high tower fused melt granulated compound fertilizer material.
For realizing the foregoing invention purpose, the present invention adopts following technical scheme:
The control method of Biuret Content in a kind of high tower fused melt granulated compound fertilizer material said method comprising the steps of:
A) urea is delivered to fusion tank through handling equipment, and adds in entry, chlorate compounds and the ammonium salt compounds more than one, form eutectic system, material forms molten urea solution at 100 ~ 120 ℃;
B) with the molten urea solution overflow to mixing tank, and add substituting nitrogenous fertilizer, phosphate fertilizer, potash fertilizer, stopping composition, trace element, make its pre-mixing in mixing tank;
C) mixture flow that pre-mixing is obtained is gone into the emulsification of slip mulser, obtains the emulsification slip;
D) the emulsification slip is fed high tower pellatizer machine spray granulating;
E) compound fertilizer granules collection, cooling, the screening with the steps d gained obtains compound manure.
Preferably, said handling equipment comprises that bucket elevator is carried or pipeline is air conveying.
Preferably, the chlorate compounds described in the step a comprises more than one in Repone K, ammonium chloride and the sodium-chlor; Said ammonium salt compounds comprises more than one in ammonium phosphate and an ammonium nitrate;
Stopping composition described in the step b comprises more than one in clay, attapulgite, zeolite powder, ground dolomite and the Paris white;
Trace element described in the step b comprises more than one in sulphur compound, calcium cpd, manganic compound, magnesium compound, molybdenum compound, zn cpds, iron cpd, copper compound and the boron cpd.
Preferably, said substituting nitrogenous fertilizer comprises more than one in ammonium sulfate, ammonium chloride, an ammonium nitrate and the urea powder;
Wherein, described urea powder is different from the powder or the powdered urea of urea, and this material is insoluble in water, white powder, more than nitrogenous 40% (quality), but none standard name still at present, circulation all is referred to as with the urea powder on the market.
Said phosphate fertilizer comprises more than one in monoammonium phosphate, diammonium phosphate, fused(calcium magnesium)phosphate, Calcium hydrogen carbonate, double superhosphate, superphosphate of lime and the Lin Suanergai;
Said potash fertilizer comprises more than one in vitriolate of tartar, Repone K, potassium primary phosphate and the saltpetre.
The amount of the water that preferably, adds in the fusion tank, chlorate compounds or ammonium salt compounds accounts for 0.5% ~ 15% of quality of material ratio in the fusion tank; The fusion under 100 ~ 120 ℃ of temperature, agitation condition of material and urea.
Agitation condition is meant and uses the employed paddle formula of common high tower fused melt granulated fusion tank to stir.
Preferably, premixed temperature is 90 ~ 110 ℃ in the mixing tank; The slurry temperature that gets into the slip mulser is 90 ~ 110 ℃; The slurry temperature that gets into tablets press is 90 ~ 110 ℃.
Wherein, the residence time of material is no more than 20min in said fusion tank and the mixing tank.
Preferably, using substituting nitrogenous fertilizer mass ratio is 0 ~ 40%, and the mass ratio of urea is 25～50%.
Biuret quality percentage composition is lower than 0.6% in the compound manure that the inventive method is produced.
Preferably, refrigerating work procedure equipment is one or more combinations in rotating cylinder water cooler, vibrated fluidized bed water cooler and the liquid bed water cooler; The screening processing apparatus is one or more combinations in vibratory screening apparatus, liquid bed water cooler and the straight line shaker.
Beneficial effect of the present invention:
A, pass through the inventive method; Make material construction become composite fertilizer's multidimensional eutectoid point system, 100 ℃～120 ℃ can fusing urea etc. raw material, realize that from the source haveing suffered production process carries out under low temperature (100 ℃～120 ℃); Reduce production energy consumption greatly, reduce the generation of biuret simultaneously;
Increased the slip mulser in b, the production technique; Solved that the high tower solids ratios is big, the solid-liquid proportional imbalance is difficult to a granulated Technology difficult problem; Can realize the urea quality ratio be low to moderate 25% or the solidliquid mixture rapid and uniform of substituting nitrogen fertilizer amount during up to 35% (quality) mix fully; Form mobile slip, do not need high temperature can make the thorough mixing of molten urea solution and powder even simultaneously, thereby reduced the generation of biuret;
The material that is used to make up the eutectoid point system among c, the present invention is the cheap raw material that is easy to obtain, and the production use does not only increase any cost, and can also save production cost;
The compound manure proportioning that d, the present invention produce is more extensive, and flexibility is stronger, can satisfy different nitrogen nutrients, the biuret mass content is lower than 0.6% granular compound fertilizer material manufacturing technique demand;
E, the present invention make up from physico-chemical property, realize temperature production, cut down the consumption of energy, and belong to process for cleanly preparing;
F, control method of the present invention can be controlled biuret process generation in 0.15% (quality), and biuret quality percentage composition is lower than 0.6% in the compound manure of being produced.
Description of drawings
Fig. 1 is a process flow sheet of the present invention.
Embodiment
The principle of the invention is, urea and certain compound mixed by a certain percentage making up the eutectoid point system, makes its Flashmelt, mixing, granulation at low temperatures, and effectively control produces the most important condition of biuret from the source; Out of proportion through slip mulser solution solid-liquid simultaneously, coldcondition mixes the inhomogeneous technical barrier that influences granulation down, realizes effective control of Biuret Content in the high tower fused melt granulated compound fertilizer material.
Following combination embodiment does to explain further and explanation that following examples do not constitute any limitation the present invention to the present invention.
Embodiment 1:
A) 35kg urea is delivered to fusion tank through handling equipment, and adds 3kg Repone K, 1kg an ammonium nitrate, form eutectic system, material forms molten urea solution at 114 ℃; Be provided with the automatic overflow device in the fusion tank, the continuous production charging, molten urea solution promptly begins automatic overflow to mixing tank after liquid level surpasses certain liquid level;
B) with the molten urea solution overflow to mixing tank, and add ammonium chloride 2kg, vitriolate of tartar 12kg, ground dolomite 30kg, monoammonium phosphate 16kg, trace element (zinc sulfate, manganous sulfate mixture) 1kg makes it in mixing tank, 102 ℃ of following pre-mixings; Be provided with the automatic overflow device in the mixing tank, continuous production, slip promptly begins automatic overflow to mulser after liquid level surpasses certain liquid level;
C) mixture that pre-mixing is obtained flows into the emulsification of constant temperature slip mulser, obtains the emulsification slip; Adopt constant temperature emulsification, promptly temperature is consistent in emulsifying temperature and the mixing tank; The emulsifier unit that uses is separated slip before and after the emulsification, and slip sucks after emulsification fully through the mulser opening for feed and discharges (it is complete that the slip that can discharge through the mulser outlet smoothly is emulsification, the emulsification terminal point) from the outlet material;
D) the emulsification slip is fed high tower pellatizer machine spray granulating; Prilling temperature and emulsifying temperature are constant;
E) compound fertilizer granules collection, cooling, the screening with the steps d gained obtains compound manure.
The compound manure of gained is nitrogenous 18.54% (quality), phosphorus 8% (quality), potassium 7.8% (quality), the high tower fused melt granulated compound fertilizer material of total nutrient 34.34% (quality).Detection method is with reference to GB15063-2009 composite fertilizer (compound manure) examination criteria
The Biuret Content detection method is with reference to GB15063-2009 composite fertilizer (compound manure) examination criteria.The urea biuret that uses in the present embodiment is 1.0% (quality), and the biuret value of the finished product is 0.35%～0.5% (quality).
Embodiment 2:
A) 25kg urea is delivered to fusion tank through handling equipment, and adds 3kg Repone K, 0.5kg an ammonium nitrate and 0.5kg water, form eutectic system, material forms molten urea solution at 110 ℃;
B) with the molten urea solution overflow to mixing tank, and add Repone K 20kg, ground dolomite 40kg, monoammonium phosphate 10kg, trace element (ferrous sulfate, ammonium molybdate mixture) 1kg makes it in mixing tank, 108 ℃ of following pre-mixings;
C) mixture that pre-mixing is obtained flows into the emulsification of constant temperature slip mulser, obtains the emulsification slip;
D) the emulsification slip is fed high tower pellatizer machine spray granulating;
E) compound fertilizer granules collection, cooling, the screening with the steps d gained obtains compound manure.
The compound manure of gained is nitrogenous 12.55% (quality), phosphorus 5% (quality), potassium 13.8% (quality), the high tower fused melt granulated compound fertilizer material of total nutrient 31.35% (quality).Detection method is with reference to GB15063-2009 composite fertilizer (compound manure) examination criteria
The Biuret Content detection method is with reference to GB15063-2009 composite fertilizer (compound manure) examination criteria.The urea biuret that uses in the present embodiment is 1.0% (quality), and the biuret value of the finished product is 0.35%～0.5% (quality).
Embodiment 3:
A) 45kg urea is delivered to fusion tank through handling equipment, and adds 4kg ammonium chloride, 2kg Repone K and 1kg water, form eutectic system, material forms molten urea solution at 108 ℃;
B) with the molten urea solution overflow to mixing tank, and add ammonium chloride 25kg, ammonium sulfate 5kg, Repone K 5kg, monoammonium phosphate 12kg, trace element (ferrous sulfate, borax, ammonium molybdate mixture) 1kg makes it in mixing tank, 105 ℃ of following pre-mixings;
C) mixture that pre-mixing is obtained flows into the emulsification of constant temperature slip mulser, obtains the emulsification slip; 105 ℃ of emulsifying temperatures;
D) the emulsification slip is fed high tower pellatizer machine spray granulating; 105 ℃ of prilling temperatures;
E) compound fertilizer granules collection, cooling, the screening with the steps d gained obtains compound manure.
The compound manure of gained is nitrogenous 30.2% (quality), phosphorus 6% (quality), potassium 5.4% (quality), the high tower fused melt granulated compound fertilizer material of total nutrient 41.6% (quality).Detection method is with reference to GB15063-2009 composite fertilizer (compound manure) examination criteria
The Biuret Content detection method is with reference to GB15063-2009 composite fertilizer (compound manure) examination criteria.The urea biuret that uses in the present embodiment is 1.0% (quality), and the biuret value of the finished product is 0.35%～0.5% (quality).
Embodiment 4:
A) 27kg urea is delivered to fusion tank through handling equipment, and adds 3kg water, form eutectic system, material forms molten urea solution at 112 ℃;
B) with the molten urea solution overflow to mixing tank, and add Repone K 20kg, ground dolomite 39kg, monoammonium phosphate 10kg, trace element (ferrous sulfate, sour copper, ammonium molybdate mixture) 1kg makes it in mixing tank, 105 ℃ of following pre-mixings;
C) mixture that pre-mixing is obtained flows into the emulsification of constant temperature slip mulser, obtains the emulsification slip; 105 ℃ of emulsifying temperatures;
D) the emulsification slip is fed high tower pellatizer machine spray granulating; 105 ℃ of prilling temperatures;
E) compound fertilizer granules collection, cooling, the screening with the steps d gained obtains compound manure.
The compound manure of gained is nitrogenous 13.42% (quality), phosphorus 5% (quality), potassium 12% (quality), the high tower fused melt granulated compound fertilizer material of total nutrient 30.42% (quality).Detection method is with reference to GB15063-2009 composite fertilizer (compound manure) examination criteria
The Biuret Content detection method is with reference to GB15063-2009 composite fertilizer (compound manure) examination criteria.The urea biuret that uses in the present embodiment is 1.0% (quality), and the biuret value of the finished product is 0.35%～0.5% (quality).
According to the announcement and the instruction of above-mentioned specification sheets, those skilled in the art in the invention can also change and revise above-mentioned embodiment.Therefore, the embodiment that discloses and describe above the present invention is not limited to also should fall in the protection domain of claim of the present invention modifications more of the present invention and change.In addition, although used some specific terms in this specification sheets, these terms are explanation for ease just, the present invention is not constituted any restriction.
Claims (10)
1. the control method of Biuret Content in the high tower fused melt granulated compound fertilizer material is characterized in that, said method comprising the steps of:
A) urea is delivered to fusion tank through handling equipment, and adds in entry, chlorate compounds and the ammonium salt compounds more than one, form eutectic system, material forms molten urea solution at 100 ~ 120 ℃;
B) the molten urea solution overflow is to mixing tank, and adds substituting nitrogenous fertilizer, phosphate fertilizer, potash fertilizer, stopping composition, trace element, makes its pre-mixing in mixing tank;
C) mixture flow that obtains of pre-mixing is gone into the emulsification of slip mulser, obtains the emulsification slip;
D) the emulsification slip is fed high tower pellatizer machine spray granulating;
E) compound fertilizer granules collection, cooling, the screening with the steps d gained obtains compound manure.
2. the control method of Biuret Content according to claim 1 is characterized in that: said handling equipment comprises that bucket elevator is carried or pipeline is air conveying.
3. the control method of Biuret Content according to claim 1, it is characterized in that: the chlorate compounds described in the step a comprises more than one in Repone K, ammonium chloride and the sodium-chlor; Said ammonium salt compounds comprises more than one in ammonium phosphate and an ammonium nitrate;
Stopping composition described in the step b comprises more than one in clay, attapulgite, zeolite powder, ground dolomite and the Paris white;
Trace element described in the step b comprises more than one in sulphur compound, calcium cpd, manganic compound, magnesium compound, molybdenum compound, zn cpds, iron cpd, copper compound and the boron cpd.
4. the control method of Biuret Content according to claim 1, it is characterized in that: said substituting nitrogenous fertilizer comprises more than one in ammonium sulfate, ammonium chloride, an ammonium nitrate and the urea powder;
Said phosphate fertilizer comprises more than one in monoammonium phosphate, diammonium phosphate, fused(calcium magnesium)phosphate, Calcium hydrogen carbonate, double superhosphate, superphosphate of lime and the Lin Suanergai;
Said potash fertilizer comprises more than one in vitriolate of tartar, Repone K, potassium primary phosphate and the saltpetre.
5. the control method of Biuret Content according to claim 1 is characterized in that: the amount of the water that adds in the fusion tank, chlorate compounds or ammonium salt compounds accounts for 0.5% ~ 15% of quality of material ratio in the fusion tank; Material fusion under 100 ~ 120 ℃ of temperature, agitation condition.
6. the control method of Biuret Content according to claim 1, it is characterized in that: premixed temperature is 90 ~ 110 ℃ in the mixing tank; The slurry temperature that gets into the slip mulser is 90 ~ 110 ℃; The slurry temperature that gets into tablets press is 90 ~ 110 ℃.
7. the control method of Biuret Content according to claim 1, it is characterized in that: the residence time of material is no more than 20min in fusion tank and the mixing tank.
8. the control method of Biuret Content according to claim 1, it is characterized in that: using substituting nitrogenous fertilizer mass ratio is 0 ~ 40%, and the mass ratio of urea is 25 ~ 50%.
9. the control method of Biuret Content according to claim 1, it is characterized in that: biuret quality percentage composition is lower than 0.6% in the compound manure of being produced.
10. the control method of Biuret Content according to claim 1, it is characterized in that: refrigerating work procedure equipment is one or more combinations in rotating cylinder water cooler, vibrated fluidized bed water cooler and the liquid bed water cooler; The screening processing apparatus is one or more combinations in vibratory screening apparatus, liquid bed water cooler and the straight line shaker.
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| CN103449878A (en) * | 2013-08-06 | 2013-12-18 | 深圳市芭田生态工程股份有限公司 | Method for lowering biuret content in high-tower granulated compound fertilizer and production facility thereof |
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