CN1398826A - Low-temperature melt process of producing granulated azophoska - Google Patents
Low-temperature melt process of producing granulated azophoska Download PDFInfo
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- CN1398826A CN1398826A CN 01126274 CN01126274A CN1398826A CN 1398826 A CN1398826 A CN 1398826A CN 01126274 CN01126274 CN 01126274 CN 01126274 A CN01126274 A CN 01126274A CN 1398826 A CN1398826 A CN 1398826A
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- urea
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- repone
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Abstract
The present invention is a low-temperature melt process for producing granulated azophoska. Melt material is first produced through mixing semi-finished product solid urea with sodium nitrate or potassium chloride or heating solid urea and sodium nitrate or potassium chloride, then it is mixed with solid ammonium phosphate to produce suspension melt slurry. The mixed melt slurry is dispersed into small liquid drops through a prilling granulator, and the small liquid drops are cooled, solidified in an oil cooling tank and separated to obtain the product. The said process may be also used in producing trace element fertilizer or color fertilizer. The said process has greatly lowered melt material temperature, no need of heating solid ammonium phosphate, simple production process, low cost, and no environmental pollution.
Description
Technical field
The present invention relates to a kind of manufacture method of granular nitrogen phospho potash complex fertilizer, relate to a kind of method that adopts the low-temperature melt method to produce the granular nitrogen phospho potash complex fertilizer or rather.
Background technology
In prior art, " chemical fertilizer handbook (China Translation and Publishing Corporation, 1984, the United Nations Industrial Development Organization compiled) report, the oil immersion prilling tower comminution granulation (Oil prilling) of relevant urea-ammonium polyphosphate mixture has been proved by nineteen sixty-eight U.S. TVA (TVA).Enter the granulation cup of rotation after the ammonium polyphosphate melts carries out pre-mixing with urea melt in this method in a groove, the temperature of mixed slurry is about 132 ℃, the slip tear drop that comes out from the granulation cup is through cooling off and being collected in the lightweight oil, this lightweight oil cools off holding temperature at about 38 ℃ by recirculated water, fertiliser granulates is separated from oil with centrifuging, and the fertiliser granulates size is 7～12 orders.The nitrogen phosphorus potassium (N-P of fertilizer product
2O
5-K
2O) formula of nutrient has 30-30-0,36-18-0,39-13-0.
" chemical fertilizer handbook (China Translation and Publishing Corporation, 1984, the United Nations Industrial Development Organization compiles) report, the result of study of carrying out oil immersion prilling tower granulation interim test based on the composite fertilizer of urea has been reported in Mitsui shipbuilding in 1972 (Misui Toatsu).Urea melt is with monoammonium phosphate and (in some cases) Repone K and the ammonium phosphate mixing of exsiccant and preheating, the mixture slip carries out the prilling tower granulation in one " prilling granulator (prilling device) ", and be captured in the low viscosity oil, fertiliser granulates is separated from oil by centrifuging.The nitrogen phosphorus potassium (N-P of fertilizer product
2O
5-K
2O) formula of nutrient has 18.6-18.6-18.6,18-21-17,28-28-0.The temperature of control slurry mixture is about 125 ℃, about 4 minutes of mixing time in the interim test.
Solid phosphorus ammonium or Repone K or vitriolate of tartar all need preheating in above-mentioned two kinds of composite fertilizer manufacture method, and the melt material temperature is greater than 120 ℃, and to the solid urea melting granulating technology, the Biuret Content of product is higher; Solid phosphorus ammonium adds pines for being easy to generate sheet material, stops up prilling spry.
Summary of the invention
The manufacture method that the purpose of this invention is to provide a kind of low-temperature melt granulated pellet shape NpK complex fertilizer, this method has overcome that solid phosphorus ammonium adds the agglomeration problems of thermogenesis and because the Biuret Content of the too high generation of melt material temperature is higher, problem such as ammonia effusion rate height in the mixing process, greatly reduce the energy consumption of production process simultaneously, and the fertilizer nitrogen phosphorus potassium proportion can be adjusted within the specific limits, can produce the granular nitrogen phospho potash complex fertilizer, also can produce nitrogen phosphorus, composite N-K fertilizer, to adapt to the nutritional needs of different crops.In addition, the compound manure manufacture method of the present invention also nutrient demand of visual crop adds a certain amount of moderate-element compound or trace compound, makes the granular nitrogen phospho potash complex fertilizer that contains multi-nutrient element.The present invention also can add a small amount of dyestuff and make colored fertilizer in the course of processing.
The principle of the manufacture method of granular nitrogen phospho potash complex fertilizer of the present invention is: according to urea and SODIUMNITRATE, Repone K can form the characteristics of eutectic mixture, different raw material fertilizer are mixed and heated to certain temperature after metering in a mixing tank, add solid phosphorus ammonium or Repone K (vitriolate of tartar) etc. then, mixed slip enters a prilling granulator that has many apertures, fertilizer slurry becomes little globule by aperture, mat gravity falls into the oil cooling groove with charge of oil in the certain altitude, bead drops in sedimentation in the oil, and cooling curing is the fertilizer small-particle, combine in the oil cooling bottom land, through promoting handling equipment the oil-containing granulated fertilizer is delivered to whizzer, with the oil on separating particles surface, promptly obtain the granular nitrogen phospho potash complex fertilizer.
The present invention realizes like this.The step of the method for low-temperature melt manufactured granular nitrogen phospho potash complex fertilizer of the present invention comprises:
(1) work in-process in urea synthesis, concentration is greater than 98% (weight), temperature is 135～145 ℃ urea strong solution or a melt, add SODIUMNITRATE or Repone K or vitriolate of tartar, generate melt material at 90～105 ℃, perhaps solid urea and SODIUMNITRATE or Repone K or vitriolate of tartar, be heated to 90～105 ℃ and generate melt material, the additional proportion of urea and SODIUMNITRATE and Repone K or vitriolate of tartar is 1: (0.02～0.2): (0～1) (weight ratio), the granularity of Repone K or vitriolate of tartar is less than 0.5 millimeter
(2) the phosphorus ammonium of granularity less than 0.5 millimeter added in the above-mentioned melt in proportion, mixed 1～3 minute, generate the molten slurry that contains phosphorus ammonium suspended substance, the additional proportion of urea and phosphorus ammonium is 1: (0～5) (weight ratio), slurry temperature are 80～105 ℃,
(3) above-mentioned molten slurry is separated into small droplets by prilling granulator, it is 25～45 ℃ oil cooling groove that small droplets mat gravity falls into oily temperature, cooling also is cured as 1～4 millimeter particle, the fertiliser granulates that falls into the oil cooling trench bottom is sent to whizzer separates overwhelming majority oil, promptly obtain the granular nitrogen phospho potash complex fertilizer of oleaginousness less than 1.5% (weight).
Cooling oil in the oil cooling groove of the present invention is a mineral oil, as machinery oil, quenching wet goods.Its heat is removed by water cooling.
Though the trace element that farm crop need seldom, the quality that improves crop yield and improve crop is had certain effect.The manufacture method of granular nitrogen phospho potash complex fertilizer of the present invention, in urea strong solution or melt and SODIUMNITRATE, Repone K or vitriolate of tartar blended while, also can add a certain amount of moderate-element compound or trace compound, in obtaining containing, the granular nitrogen phospho potash complex fertilizer of micronutrient according to the needs of crop or soil.
Moderate-element compound of the present invention is one or more the mixture in calcium cpd, magnesium compound, the sulphur compound, as compounds such as calcium sulfate, nitrocalcite, sal epsom, potassium magnesium sulfate, sulphur; Described trace compound is one or more the mixture in the compounds such as boron compound, copper compound, iron cpd, manganic compound, molybdenum compound, zn cpds, as compounds such as copper sulfate, cupric oxide, ammonium molybdate, Sodium orthomolybdate, boric acid, borax, ferrous sulfate, chelated iron, zinc sulfate, zinc oxide, zinc chloride, manganous sulfate, manganese oxide, Manganous chloride tetrahydrates.
A spot of trace compound directly joins in the fertilizer slurry, mixes the back granulation.
The manufacture method of granular nitrogen phospho potash complex fertilizer of the present invention at the fertilizer solution blended simultaneously, also can add a certain amount of dyestuff and make color grains shape compound manure.Described dyestuff is a matching stain, as Xylene Red, acid blue, erie black, turmeric yellow etc.The add-on of dyestuff and the ratio of fertilizer are (0.0001～0.0003): 1 (weight ratio).
The color of colored composite fertilizer can be used as the differentiation look of the brand mark of fertilizer enterprise or different varieties, trade mark fertilizer.But make colored fertilizer, except that the color that will consider dyestuff, also will consider of the influence of the intrinsic colour of the Repone K fertilizer that adds or some trace compounds, as red Repone K, copper sulfate etc. to the fertilizer color of required manufacturing.Should avoid making the influence of composite fertilizer required color by selecting different raw materials.
The manufacture method of granular nitrogen phospho potash complex fertilizer of the present invention, by the oleaginousness after centrifugal less than the also diatomite of the available finely powdered processing of applying powder of the granular compound fertilizer material of 1.5% (weight).Diatomaceous fineness is 90% less than 20 microns, and 50% less than 3 microns.
The present invention compares with existing fused mass granulating technology and has the following advantages:
1, can directly utilize work in-process---urea strong solution or melt in the urea plant urea synthesis, by introducing inorganic salt such as SODIUMNITRATE, Repone K, utilize it can form the characteristics of eutectoid point compound, got rid of the heat-processed of phosphorus ammonium, simplified Production Flow Chart greatly, investment cost and process cost are lower, can change the single disadvantage of original technology kind simultaneously.Granular nitrogen-phosphorus potassium Nitrogen, Phosphorus and Potassium can be produced, granular nitrogen-phosphorus, binary compound fertilizer containing nitrogen and potassium can be produced again.
2, melting granulating technology makes full use of the heat energy of former urea melt, and phosphorus ammonium (or Repone K) need not heating, and the melt material temperature reduces by 15～30 ℃, and moisture content is very low, and the drying-free process has been saved energy consumption.
3, qualified product particle percentage composition is very high, so does not have returning charge substantially in the production process.
4, the product nitrogen contains urea nitrigen, ammonia-state nitrogen and nitric nitrogen, and fertilizer efficiency is good.The product particle surface is slick and sly, and granule strength is big, good water solubility, prevented from caking.
5, product can be made into colour or contain multiple in the amount, the trace element compound manure, to adapt to the requirement of Different Crop, soil, weather.
6, good operational environment, three-waste free discharge.
Embodiment
In order to implement the present invention better, the present invention is further illustrated now to enumerate following embodiment, but embodiment is not a limitation of the present invention.Percentage ratio among the following embodiment all is weight percentage.
Embodiment 1
Get urea plant flash evaporator outlet urea soln or melt 200 grams, concentration is greater than 99%, about 140 ℃ of temperature, adding solid nitric acid sodium 36 grams and granularity restrain less than 0.5 millimeter white Repone K 180, add acid blue dye 0.08 gram simultaneously, mixed about 1 minute, 90～105 ℃ of slurry temperatures, granularity adds in the above-mentioned slip less than 0.5 millimeter solid phosphorus ammonium 116 grams, mixed 1～5 minute, contain the phosphorus ammonium, it is 25～45 ℃ oil cooling groove that the slip of Repone K suspended substance falls into oily temperature by Fitz chilsonator, cooling also is cured as 1～4 millimeter pellet, after the butyraceous granulated fertilizer separates most oil by whizzer, obtain blue particle shape NpK complex fertilizer product, this product contains N 20.6%, P
2O
59.6%, K
2O 20.3%, moisture 0.50%, the granule strength of product greater than 20 newton/.
Embodiment 2
Get urea plant flash evaporator outlet urea soln 200 grams, concentration about 99%, about 140 ℃ of temperature, adding solid nitric acid sodium 6 grams and granularity restrain less than 0.5 millimeter red Repone K 140, mixed about 1 minute, 90～105 ℃ of slurry temperatures, it is 25～45 ℃ oil cooling groove that slip falls into oily temperature by Fitz chilsonator, cooling also is cured as 1～4 millimeter pellet, after the butyraceous granulated fertilizer separates most oil by whizzer, obtain red granules shape composite N-K fertilizer product, this product contains N 26.6%, P
2O
50%, K
2O 24.3%, moisture 0.8%, the granule strength of product greater than 15 newton/.
Embodiment 3
Solid urea 300 grams, solid nitric acid sodium 48 grams, be heated to 100 ℃ and become fused solution, granularity restrains less than 0.5 millimeter phosphorus ammonium 200, boric acid 3 grams, magnesium sulfate heptahydrate 9 grams, join in the molten materials, mixed 1～5 minute, 80～95 ℃ of slurry temperatures, it is 25～45 ℃ oil cooling groove that the slip that contains phosphorus ammonium suspended solid falls into oily temperature by Fitz chilsonator, cools off and is cured as 1～4 millimeter pellet, the butyraceous granulated fertilizer obtains containing N 30.6%, P after separating most oil by whizzer
2O
516.1%, the nitro phosphor complex of moisture 0.50%, this fertilizer contains magnesium, sulphur moderate-element and micronutrient boron, the granule strength of product be greater than 20 newton/.
Embodiment 4
Solid urea 200 grams, solid nitric acid sodium 30 grams, solid Repone K 100 grams, be heated to 110 ℃ and become fused solution, granularity restrains less than 0.5 millimeter phosphorus ammonium 40, copper sulfate 4 grams, ammonium molybdate 4 grams join in the molten materials together, mix about 3 minutes, about 95 ℃ of slurry temperature, it is 25～45 ℃ oil cooling groove that this material falls into oily temperature by Fitz chilsonator, cools off and is cured as 1～4 millimeter pellet, after the butyraceous granulated fertilizer separates most oil by whizzer, obtain mazarine granular nitrogen phospho potash complex fertilizer, this product contains N 27.4%, P
2O
54.8%, K
2O 16.2%, moisture 0.50% contain sulphur moderate-element and trace copper and molybdenum simultaneously, the granule strength of product be 15 newton/.
Embodiment 5
Solid urea 200 grams, solid nitric acid sodium 33.6 grams, be heated to 100 ℃ and become fused solution, granularity is less than vitriolate of tartar 194.7 grams of 0.5 millimeter white, calcium sulfate 10 grams, zinc sulfate 4 grams, manganous sulfate 4 gram joins in the molten materials, mix about 2 minutes after, 95 ℃ of slurry temperatures, it is 25～45 ℃ oil cooling groove that the slip that contains the vitriolate of tartar suspended substance falls into oily temperature by Fitz chilsonator, cools off and is cured as 1～4 millimeter pellet, after the butyraceous granulated fertilizer separates most oil by whizzer, obtain amber granular nitrogen-potassium composite fertilizer product, this product N: K
2O=1: 1, contain N 22.7%, K
2O 22.7%, moisture 0.50% contain calcium, sulphur, zinc moderate-element and trace element simultaneously, the granule strength of product be 18 newton/.
Embodiment 6
Solid urea 100 grams, solid nitric acid sodium 17 grams, granularity is less than Repone K 40 grams of 0.5 millimeter white, be heated to 105 ℃ and become fused solution, add acid red dye 0.015 gram, solid phosphorus ammonium 55 grams, join in the molten materials, after mixing about 2 minutes, 95 ℃ of slurry temperatures contain the phosphorus ammonium, it is 25～45 ℃ oil cooling groove that the slip of Repone K suspended substance falls into oily temperature by Fitz chilsonator, cooling also is cured as 1～4 millimeter pellet, the butyraceous granulated fertilizer obtains large red granular nitrogen-potassium composite fertilizer product after separating most oil by whizzer, and this product contains N25.8%, P
2O
511.3%, K
2O 11.4%, moisture 0.50%, its granule strength be 16 newton/.
Embodiment 7
Solid urea 200 grams, solid nitric acid sodium 30 grams, be heated to 105 ℃ and become fused solution, granularity restrains less than 0.5 millimeter white Repone K 160, join in the molten urea solution, mixed about 1 minute, 95 ℃ of slurry temperatures, it is 25～45 ℃ oil cooling groove that the slip that contains the Repone K suspended substance falls into oily temperature by Fitz chilsonator, cooling also is cured as 1～4 millimeter pellet, the butyraceous granulated fertilizer obtains white granular composite N-K fertilizer product after separating most oil by whizzer, and this product contains N 24.8%, K
2O 24.6%, moisture 0.5%, granule strength greater than 18 newton/.
Claims (4)
1, a kind of method of low-temperature melt manufactured granular nitrogen phospho potash complex fertilizer is characterized in that the step of this method comprises:
(1) work in-process in urea synthesis, concentration is greater than 98% (weight), temperature is 135～145 ℃ urea strong solution or a melt, add SODIUMNITRATE or Repone K or vitriolate of tartar, generate melt material at 90～105 ℃, perhaps solid urea and SODIUMNITRATE or Repone K or vitriolate of tartar, be heated to 90～105 ℃ and generate melt material, the additional proportion of urea and SODIUMNITRATE or Repone K or vitriolate of tartar is 1: (O.02～0.2): (O～1) (weight ratio), the granularity of Repone K or vitriolate of tartar is less than 0.5 millimeter
(2) the phosphorus ammonium of granularity less than 0.5 millimeter added in the above-mentioned melt in proportion, mixed 1～3 minute, generate the molten slurry that contains phosphorus ammonium suspended substance, the additional proportion of urea and phosphorus ammonium is 1: (O～5) (weight ratio), slurry temperature are 80～105 ℃,
(3) above-mentioned molten slurry is separated into small droplets by prilling granulator, it is 25～45 ℃ oil cooling groove that small droplets mat gravity falls into oily temperature, cooling also is cured as 1～4 millimeter particle, the fertiliser granulates that falls into the oil cooling trench bottom is sent to whizzer separates overwhelming majority oil, promptly obtain the granular nitrogen phospho potash complex fertilizer of oleaginousness less than 1.5% (weight).
2, the manufacture method of granular nitrogen phospho potash complex fertilizer according to claim 1, it is characterized in that in urea strong solution or melt and SODIUMNITRATE blended while, also can add moderate-element compound or trace compound, in obtaining containing, the trace element the granular nitrogen phospho potash complex fertilizer.
3, the manufacture method of granular nitrogen phospho potash complex fertilizer according to claim 2 is characterized in that described moderate-element compound is one or more the mixture in calcium cpd, magnesium compound, the sulphur compound; Described trace compound is one or more the mixture in boron compound, copper compound, iron cpd, manganic compound, molybdenum compound, the zn cpds.
4,, it is characterized in that described moderate-element compound is one or more the mixture in the compounds such as calcium sulfate, nitrocalcite, sal epsom, potassium magnesium sulfate, sulphur according to the manufacture method of claim 2 or 3 described granular nitrogen phospho potash complex fertilizers; Described trace compound is one or more the mixture in the compounds such as copper sulfate, cupric oxide, ammonium molybdate, Sodium orthomolybdate, boric acid, borax, ferrous sulfate, chelated iron, zinc sulfate, zinc oxide, zinc chloride, manganous sulfate, manganese oxide, Manganous chloride tetrahydrate.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01126274 CN1398826A (en) | 2001-07-19 | 2001-07-19 | Low-temperature melt process of producing granulated azophoska |
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|---|---|---|---|
| CN 01126274 CN1398826A (en) | 2001-07-19 | 2001-07-19 | Low-temperature melt process of producing granulated azophoska |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102020513A (en) * | 2010-12-28 | 2011-04-20 | 瓮福（集团）有限责任公司 | Additive for tower-type pelletizing of compound fertilizer |
| CN103626568A (en) * | 2012-08-29 | 2014-03-12 | 谢树才 | Preparation technology for double-enzyme zinc and ammonium composite fertilizer |
-
2001
- 2001-07-19 CN CN 01126274 patent/CN1398826A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102020513A (en) * | 2010-12-28 | 2011-04-20 | 瓮福（集团）有限责任公司 | Additive for tower-type pelletizing of compound fertilizer |
| CN103626568A (en) * | 2012-08-29 | 2014-03-12 | 谢树才 | Preparation technology for double-enzyme zinc and ammonium composite fertilizer |
| CN103626568B (en) * | 2012-08-29 | 2015-08-12 | 谢树才 | A kind of two enzyme zinc ammonium compound fertilizer preparation technology |
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