CN1130323C - process for preparing high-concentration granular composite N-K fertilizer - Google Patents
process for preparing high-concentration granular composite N-K fertilizer Download PDFInfo
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- CN1130323C CN1130323C CN 99127009 CN99127009A CN1130323C CN 1130323 C CN1130323 C CN 1130323C CN 99127009 CN99127009 CN 99127009 CN 99127009 A CN99127009 A CN 99127009A CN 1130323 C CN1130323 C CN 1130323C
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05C—NITROGENOUS FERTILISERS
- C05C9/00—Fertilisers containing urea or urea compounds
Abstract
The present invention relates to a method for manufacturing granular high-concentration N-K compound fertilizers. A semifinished high-concentration urea solution synthesized in a urea factory or meltwater of heating solid urea is mixed with heating potassium chloride or heating potassium sulfate, or the solid urea and the potassium chloride or the potassium sulfate are heated to form fusant containing suspended substances of the potassium chloride or the potassium sulfate, and the fusant slurry is dispersed into small droplets by a granulating device. Because of gravity, the small droplets fall into an air cooling tower, and are cooled and solidified to form the N-K compound fertilizers. Compound fertilizers containing secondary elements and trace elements, or color compound fertilizers can be manufactured by using the method. The method has the advantages of simple manufacturing process and no waste water, waste gas and waste slag, and the products can be used as base fertilizers of blended fertilizers, or are directly fertilized.
Description
The present invention relates to a kind of manufacture method of high-concentration granular composite N-K fertilizer, particularly relate to a kind of manufacture method of high-concentration granular composite N-K fertilizer of melt material tower granulation.
Composite fertilizer is the inexorable trend of chemical fertilizer industrial development in modern age, has accounted for 70%～80% of total fertilizer application amount in the country of chemical fertilizer industry prosperity.Blended fertilizer is an importance of composite fertilizer development, characteristics such as it has, and production technique is simple, flexible operation, production cost is low and penetration and promotion is easy.In addition, it can also prevent the Physical Loss or Damage of fertilizer effectively, the labor force aspect saving is prepared, transported, uses at fertilizer, and therefore, developed countries uses blended fertilizer quite general.For example, cover surplus the blended fertilizer device 8000 has been had the nineties in the U.S., and output accounts for 40% of world's total amount consumed, accounts for 70% of U.S.'s compound manure; The blended fertilizer output of Japanese nineteen eighty-three has reached 510,000 tons.China's blended fertilizer still is in the starting stage at present, and the major cause of slower development is the backwardness of granular urea and particulate state Repone K production technology, and output is less than normal, and is second-rate, can't satisfy the basic demand of blended fertilizer " material fertilizer ".
Blended fertilizer to one of the basic demand of its " material fertilizer " is: the base fertilizer that needs blending is particulate state all, and granular size, rerum natura form and material ratio heavy require haply consistent.The fertilizer that needs blending can be single fertilizer or compound manure, also can be certain combination of two kinds of fertilizer." material fertilizer " of the most frequently used blended fertilizer is monoammonium phosphate, diammonium phosphate, double superhosphate, Repone K, ammonium nitrate, urea and ammonium sulfate etc.Urea and Repone K are the main nitrogenous fertilizer and the potash fertilizer of blended fertilizer.Usually urea product is a pellet, and the Repone K product is powdery or xln.Two kinds of fertilizer need separately through producing granular urea as improving urea production process as " material fertilizer " of blended fertilizer after the special processing, and Repone K becomes oblate particle or random platy shaped particle by extruder grain.However, the granular mass of urea and Repone K product still is difficult to reach the desirable requirement of blended fertilizer, has influenced the quality of blended fertilizer and applies.
The characteristics of fused mass granulating technique are that material is in high temperature fused state, and water content is very low, and flowable melt directly sprays in the refrigerant (refrigerant is air or the undissolved liquid of melt material normally, as the mineral wet goods), and material is solidified into spheroidal particle when cooling; Perhaps flowable melt sprays on the interior returning charge particle of mechanical granulator, makes it to be coated with or to be bonded to satisfactory particle at tiny particle surface.The evaporation of solution or concentrate no doubt requires the expenditure of energy, but effective far beyond the dried particles product aspect utilizing at energy, can also make full use of reaction heat still more and come evaporation section even whole moisture in some production technique; General granulation process, drying machine are normally maximum and be the most expensive equipment in the production equipment, and the fused mass granulating technique drying-free has been saved investment and energy consumption.
Fused mass granulating legal system composite fertilizer technology is applied to monoammonium phosphate (MAP) the earliest, nitric acid ammonium phosphate (APN), urea ammonium phosphates (UAP) etc. in the production process of these fertilizer, can add sylvite or other solid materials and produce granular nitrogen phosphorus potassium complex fertilizer product.By the difference of granulation mode, fused mass granulating legal system compound fertilizer technology mainly can be divided into: prilling tower sprinkling pelleting technology, oil cooling granulation process, biaxial granulation technology, rotary drum prilling process, spray granulating technology, disk granulation technology, steel band granulation process etc.
Prilling tower sprinkling pelleting process application the earliest, occasion is the granulation of single nitrogenous fertilizer (as urea, ammonium nitrate etc.) the most widely, now expanded the granulation of nitrogen phosphorus and NpK complex fertilizer to.Prilling tower has circular and square two kinds, and in the majority with circle.Look actual conditions in the tower and can adopt natural ventilation or forced ventilation.The virtual height of tower is decided according to the drop cooling curing required time of melt, so relevant with material characteristic, size of particles and draft type etc.Granulating equipment has rotating sprinkler and oscillatory type shower nozzle two classes, and the latter is mainly used in square tower.
(1) Dutch Si Tamika this law (Stami Carbon) nitric acid ammonium-potassium phosphate Production Flow Chart:
(Jiang Shanxiang etc. write " phosphoric acid, phosphate fertilizer and composite fertilizer ", Chemical Industry Press, 1999) report, the technical process of Dutch Stamicarbon B.V. prilling tower sprinkling pelleting explained hereafter nitric acid ammonium-potassium phosphate is: concentration is 47%～55% nitric acid and 52%～54%P
2O
5Phosphoric acid by wet process mix after, sending into neutralizer, with ammonia nitration mixture to be neutralized to pH be 2.8～3.2, the nitric acid ammonium phosphate solution that generates is evaporated to water content about 1.8% in the single-effect evaporator (operating pressure of heating tube is 1.22～1.52MPa, about 200 ℃ of temperature) of natural circulation.Temperature is the header tank that 170 ℃ Melt Pump is delivered to the granulation cat head.Be ground to certain fineness and be preheated to 170 ℃ Repone K and in mixing tank, mix with nitric acid ammonium phosphate melt from header tank, require mixing time less than 1 minute, in order to avoid ammonium nitrate and the reaction of Repone K generation salt pair, make the viscosity increased of melt, melt flows into rotary nozzle and sprays into drop, drop in tower, descend and conduct heat with the airflow that rises, mass transfer, be solidified into particle and fall within the bottom of the tower.Temperature is about 90 ℃ granule materials through operations such as cooling, screening, face powders, and the qualified particle of 1.5～4.0mm is sent to the warehouse packing.Macrobead after fragmentation and tiny powdered material (account for total amount 3%～8%) circulation deliver to melt storage tank remix.Can produce nitrogen phosphorus binary compound fertilizer with this flow process, also can produce nitrogen phosphorus potassium Nitrogen, Phosphorus and Potassium, the main products specification has: 25-9-9,22-11-11,17-17-17,17-9-22,15-15-21 etc.
The Albright and the Weir inferior (Albright.Wilson Limited.Solids Handling and Metering an NPK Prilling Plant.Proceedings of theFertilizer Society.London.1994.) of the state-run mining company of Holland have been done improvement to above-mentioned technology, to produce nitric acid ammonium-potassium phosphate compound manure, it is 25-9-9 that plant-scale production equipment has been produced specification, 22-11-11, the NpK complex fertilizer of 17-9-22 and 15-15-21.
With ammonia to nitric acid the neutralization of pressurizeing produce ammonium nitrate, utilize the exhaust steam of its product, in vacuum-evaporator, the ammonium nitrate solution that generates is concentrated to 92%-94% from 72%.Then, this solution and concentration are 50%P
2O
5Phosphoric acid by wet process mix, mixture neutralizes with ammonia and only generates the monoammonium phosphate stage, concentrates in a vacuum-evaporator again, is formed on 175 ℃ of melts under the temperature.This melts water content is about 0.5%, and with the melts medial launder 2# that is pumped into the prilling tower top, mixes in the Special Mixed machine with Repone K preheating, Powdered, and the shower nozzle that mixture directly is discharged into rotation carries out granulation.
A particular requirement of this technology is that Repone K must grind very carefully, in case the eyelet of major structure grain shower nozzle stops up, and it to be preheating to sufficiently high temperature, to prevent the melts cooling, optimal Repone K fineness is less than 0.5 millimeter, and best preheating temperature scope is 140～160 ℃.Repone K is to prepare in a machinery with drying, grinding and heating function in the production process, and be transported to the feed bin that adds at prilling tower top by the pressurized air of heat, any detritus all will sieve as wood chip, paper or chopped cooked entrails of sheep metal, otherwise will stop up the shower nozzle eyelet.
Mixing time must be very short, because muriate can play the decomposition that katalysis impels ammonium nitrate.Because mixing time is shorter, advancing the melts of mixing machine and the input speed of Repone K must too much variation occur to prevent the mixture composition accurately with steady.
(2) Norway's Hydro method (Norsk Hydro) urea ammonium phosphate (UAP) and urea ammonium phosphate potassium (UAPK) Production Flow Chart [Urea-based NP and NPK Fertilizers.Phosphorus; Potassium (76): 48]:
Fusing urea (water content about 0.3%) is with after entering the mixing tank mixing together through solid phosphoric acid one ammonium of well heater preheating, Repone K (when producing UAP not need with) and returning charge, rotary nozzle by cat head sprays granulation, cooling curing became particle during drop descended in tower, through screening, go again after the macrobead fragmentation and sieve, undersize material is recovered to mixing tank as returning charge, and qualified particle is as finished product packing.If produce UAPK, then finished product need pass through surface treatment (adding the coating agent parcel) before packing, in case caking.All need not to cool off with this explained hereafter UAP and UAPK.
Pilot plant was once produced the UAP and the UAPK product of 29-29-0,36-18-0,19-19-19 and 22-11-22 specification with this flow process, and product has good physicals.
The advantage of prilling tower sprinkling pelleting technology system high-concentration compound fertilizer material can reduce:
(1) directly utilizes urea or ammonium nitrate strong solution or monoammonium phosphate melt, fragmentation procedure when having saved the sprinkling pelleting process of urea or ammonium nitrate solution and solid finished urea or ammonium nitrate compound fertilizer making, or the manufacturing processed of solid phosphoric acid one ammonium, simplified Production Flow Chart greatly.
(2) fused mass granulating technique makes full use of the heat energy of fusing urea, ammonium nitrate or monoammonium phosphate melt, and moisture content of material is very low, and the drying-free process has been saved energy consumption.
(3) qualified product particle percentage composition height, so production process returning charge amount is few.
(4) particle surface is smooth, mellow and full, and prevented from caking has the higher market competitiveness.
(5) good operational environment, three-waste free discharge belongs to process for cleanly preparing.
(6) prilling granulator than general is low usually for prilling tower sprinkling pelleting device initial cost and process cost, and the device that industrial scale is big is all the more so.
Above-mentioned two kinds of composite fertilizer manufacture method only limit to make nitro phosphor complex (urea ammonium phosphate) or NpK complex fertilizer (urea-monoammonium phosphate-KCl system), and " material fertilizer " that be used for blended fertilizer is subjected to certain limitation.
The manufacture method that the purpose of this invention is to provide a kind of high-concentration granular composite N-K fertilizer; this method has overcome behind the little and Repone K extruder grain of urea product particle oblate particle or platy shaped particle is used for the unfavorable defective of blended fertilizer " material fertilizer "; and fertilizer nitrogen potassium ratio can be adjusted within the specific limits, to adapt to the nutritional needs of different crops.
Another object of the present invention be in the compound manure manufacturing processed also the nutrient demand of visual crop add a certain amount of moderate-element compound or trace compound, make the granular nitrogen-potassium composite fertilizer that contains multi-nutrient element.
Further purpose of the present invention is also can add small amounts of pigment in the fertilizer manufacturing processed to make the colour composite fertilizer material.
The principle of the manufacture method of high-concentration granular composite N-K fertilizer of the present invention is: the characteristics that can form eutectic mixture according to urea and Repone K or vitriolate of tartar, different raw material fertilizer are heated to certain temperature after metering, in a mixing tank, mix, mixed slip enters a special prilling granulator, and prilling granulator can be rotating sprinkler or oscillatory type nozzle arrangement.The former is the back taper type, and the side has the eyelet of certain distribution, is driven along the axis direction rotation by variable-frequency motor, and molten slurry mat centrifugal force sprays from the shower nozzle eyelet becomes drop; The latter is the spray dish that has aperture, drives the vibration shower nozzle by variable-frequency motor, and molten slurry mat exciting force sprays from the shower nozzle eyelet becomes drop.Melt material becomes little globule by the aperture of shower nozzle, and mat gravity falls into atmospheric cooling tower, and cooling curing is the fertilizer small-particle, promptly obtains granular nitrogen-potassium composite fertilizer.
The present invention realizes like this.The step of manufacturing of high-concentration granular composite N-K fertilizer of the present invention comprises:
(1) the work in-process concentration in the urea synthesis greater than 98%, temperature is 135～145 ℃ urea strong solution or melt, perhaps solid urea is heated to 135～145 ℃ urea melt, with granularity less than 0.5 millimeter, be heated to 100～125 ℃ Repone K or vitriolate of tartar in advance and be mixed together 1～3 minute, generation contains the molten slurry of Repone K or vitriolate of tartar suspended substance, slurry temperature is 115～135 ℃, and the additional proportion of urea and Repone K or vitriolate of tartar is a urea: Repone K or vitriolate of tartar=0.5～10: 1 (weight ratio); Perhaps solid urea and Repone K or vitriolate of tartar heat the generation melt together, and temperature is 115～135 ℃, and the ratio of urea and Repone K or vitriolate of tartar is a urea: Repone K or vitriolate of tartar=0.5～10: 1 (weight ratio),
(2) molten slurry is separated into small droplets by prilling granulator, small droplets mat gravity falls into atmospheric cooling tower, cools off and is cured as 1～4.75 millimeter particle, promptly obtains high-concentration granular composite N-K fertilizer.
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 high-concentration granular composite N-K fertilizer of the present invention, in urea and 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-potassium composite 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, integration iron, zinc sulfate, zinc oxide, zinc chloride, manganous sulfate, manganese oxide, Manganous chloride tetrahydrates.
A spot of trace compound can preheating before adding or is directly joined in the fertilizer slurry without preheating, mixes the back granulation.Need be heated to 100～110 ℃ before the moderate-element compound.
The manufacture method of high-concentration granular composite N-K fertilizer of the present invention at the fertilizer solution blended simultaneously, also can add a certain amount of pigment and make color grains shape compound manure.Described pigment is acid pigment, as Xylene Red, acid blue, erie black, turmeric yellow etc.The add-on of pigment 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 pigment, 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 high-concentration granular composite N-K fertilizer of the present invention, in urea and Repone K or vitriolate of tartar blended while, also can optionally add the specification that certain quantity of additive is adjusted product, described additive is an inert material, as ground dolomite, talcum powder, wilkinite etc.The add-on of additive is 0%～25% (weight) of total inventory.
The manufacture method of high-concentration granular composite N-K fertilizer of the present invention, the also available anti-hard caking agent of granular compound fertilizer material carries out surface treatment, then with the processing of applying powder of the diatomite of finely powdered.Described anti-hard caking agent is the amine tensio-active agent.Diatomaceous fineness is 90% less than 20 microns, and 50% less than 3 microns.
The present invention compared with prior art has the following advantages:
1, can directly utilize work in-process---urea strong solution or melt in the urea plant urea synthesis, granular urea production and Repone K balling-up technology are combined, simplified Production Flow Chart, investment cost and process cost are lower, can change the single disadvantage of urea plant kind simultaneously.
2, melting granulating technology can make full use of the heat energy of former urea melt, and moisture content of material is very low, and the drying-free process has been saved energy consumption.And good operational environment, three-waste free discharge.
3, qualified product particle percentage composition is very high, so the returning charge amount is few in the production process.Product particle surface is slick and sly, and prevented from caking can directly be used or as " material fertilizer " of blended fertilizer.
4, product can be made into the compound manure that contains multiple middle amount, trace element or does not have the chlorine compound manure, to adapt to the requirement of Different Crop, soil, weather.Also can make the color grains compound manure by adding pigment makes product have more the market competitiveness.
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.
Embodiment 1
Get 10.4 kilograms of urea plant flash evaporator outlet urea soln or melts, concentration is greater than 98%, about 142 ℃ of temperature, add granularity and be preheated to 7.6 kilograms in about 105 ℃ white Repone K less than 0.5 millimeter, 1.5 kilograms of magnesium sulfate heptahydrates, add acid blue pigment 2.5 grams simultaneously, mixed about 1 minute, 115～130 ℃ of slurry temperatures, the slip that contains the Repone K suspended substance falls into prilling tower by the vibrating prilling device, cooling also is cured as 1～4 millimeter pellet, obtains blue particle shape high concentration N K compound fertilizer product, and this product contains N24.23%, K
2O22.66%, moisture 0.38%, and contain moderate-elements such as magnesium, sulphur, the granule strength of product greater than 30 newton/.
Embodiment 2
10.0 kilograms of solid ureas, being heated to 136 ℃ becomes fused solution, and granularity is less than 4.6 kilograms in 0.5 millimeter white Repone K, 1.0 kilograms of boric acid, 0.5 kilogram of cupric sulfate pentahydrate, 2.3 kilograms in calcium sulfate, be preheating to about 105 ℃ after, join in the molten urea solution, mixed about 3 minutes, 115～125 ℃ of slurry temperatures, the slip that contains the Repone K suspended substance falls into prilling tower by Fitz chilsonator, cooling also is cured as 1～4.75 millimeter pellet, obtains containing N24.88%, K
2The light blue composite N-K fertilizer of O12.10%, moisture 0.51%, this fertilizer contain moderate-element calcium and micronutrient boron, copper, the granule strength of product be 37.9 newton/.
Embodiment 3
Get 15.0 kilograms of urea plant flash evaporator outlet urea solns, concentration about 99%, about 142 ℃ of temperature, add granularity and be preheated to 1.88 kilograms in about 120 ℃ red Repone K, mixed 120～135 ℃ of slurry temperatures about 1 minute 15 seconds less than 0.5 millimeter, slip falls into prilling tower by the rotating granulation device, cooling also is cured as 1～4 millimeter pellet, obtains red granules shape composite N-K fertilizer product, and this product contains N38.68%, K
2O6.78%, moisture 1.02%, the granule strength of product greater than 20 newton/.
Embodiment 4
9.8 kilograms of solid ureas are pre-mixed for 1.2 kilograms with the white vitriolate of tartar of granularity less than 0.5 millimeter, add 1.5 kilograms of magnesium sulfate heptahydrates again, 0.5 kilogram in copper sulfate, 0.5 kilogram of ammonium molybdate, 0.5 kilogram in zinc sulfate, 0.5 kilogram of boric acid, 0.5 kilogram of manganous sulfate becomes molten slurry when being heated to about 120 ℃ jointly, this material falls into prilling tower by Fitz chilsonator, cooling also is cured as 1～4.75 millimeter pellet, obtains light light blue no chlorine granular nitrogen-potassium composite fertilizer, and this product contains N30.01%, K
2O3.98%, moisture 1.32% contain moderate-element sulphur, magnesium and trace copper, molybdenum, zinc, boron, manganese etc. simultaneously, the granule strength of product be 30.4 newton/.
Embodiment 5
9.8 kilograms of solid ureas, be heated to 140 ℃ and become fused solution, granularity is less than 2.5 kilograms in the Repone K of 0.5 millimeter redness, 2.5 kilograms in calcium sulfate, after being preheating to about 125 ℃ together, join in the molten urea solution, add Xylene Red pigment 1.5 grams simultaneously, after mixing about 1 minute, 120～135 ℃ of slurry temperatures, slip falls into prilling tower by Fitz chilsonator, cools off and is cured as 1～4.75 millimeter pellet, obtain red granules shape high concentration N K compound fertilizer product, this product contains N29.89%, K
2O10.18%, moisture 0.50% contain calcium, sulphur moderate-element simultaneously, the granule strength of product be 25.0 newton/.
Claims (7)
1. the manufacture method of a high-concentration granular composite N-K fertilizer is characterized in that this compound manure step of manufacturing comprises:
(1) the work in-process concentration in the urea synthesis greater than 98%, temperature is 135～145 ℃ urea strong solution or melt, perhaps solid urea is heated to 135～145 ℃ urea melt, with granularity less than 0.5 millimeter, be heated to 100～125 ℃ Repone K or vitriolate of tartar in advance and be mixed together 1～3 minute, generation contains the molten slurry of Repone K or vitriolate of tartar suspended substance, slurry temperature is 115～135 ℃, and the additional proportion of urea and Repone K or vitriolate of tartar is a urea: Repone K or vitriolate of tartar=0.5～10: 1 (weight ratio); Perhaps solid urea and Repone K or vitriolate of tartar heat the generation melt together, and temperature is 115～135 ℃, and the ratio of urea and Repone K or vitriolate of tartar is a urea: Repone K or vitriolate of tartar=0.5～10: 1 (weight ratio),
(2) molten slurry is separated into small droplets by prilling granulator, small droplets mat gravity falls into atmospheric cooling tower, cools off and is cured as 1～4.75 millimeter particle, promptly obtains high-concentration granular composite N-K fertilizer.
2. the manufacture method of high-concentration granular composite N-K fertilizer according to claim 1, it is characterized in that in urea and Repone K or vitriolate of tartar blended while, also can optionally add a certain amount of moderate-element compound or trace compound, in obtaining containing, the trace element high-concentration granular composite N-K fertilizer.
3. the manufacture method of high-concentration granular composite N-K 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. according to the manufacture method of claim 2 or 3 described high-concentration granular composite N-K fertilizers, it is characterized in that described moderate-element compound is one or more the mixture in calcium sulfate, nitrocalcite, sal epsom, potassium magnesium sulfate, the sulfur compound; Described trace compound is one or more the mixture in 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, the Manganous chloride tetrahydrate compound.
5. the manufacture method of high-concentration granular composite N-K fertilizer according to claim 1 and 2, it is characterized in that simultaneously at the fertilizer solution blended, also can add a certain amount of pigment and make color grains shape compound manure, described pigment is acid pigment Xylene Red, acid blue, erie black, turmeric yellow, and the add-on of pigment and the ratio of fertilizer are (0.0001～0.0003): 1 (weight ratio).
6. the manufacture method of high-concentration granular composite N-K fertilizer according to claim 1, it is characterized in that in urea and Repone K or vitriolate of tartar blended while, also can optionally add the specification that certain quantity of additive is adjusted product, described additive is inert material ground dolomite, talcum powder, wilkinite.
7. the manufacture method of high-concentration granular composite N-K fertilizer according to claim 1, it is characterized in that the also available anti-hard caking agent of granular compound fertilizer material after the granulation carries out surface treatment, described anti-hard caking agent is the amine tensio-active agent, then with the processing of applying powder of the diatomite of finely powdered.
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| CN 99127009 CN1130323C (en) | 1999-12-29 | 1999-12-29 | process for preparing high-concentration granular composite N-K fertilizer |
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Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100383091C (en) * | 2004-12-27 | 2008-04-23 | 上海化工研究院 | Granulating Method in tower type for producing complex fertilizer of nitrogen, phosphor and potass |
| CN101152622B (en) * | 2006-09-26 | 2013-04-10 | 霍尼韦尔国际公司 | Granulation method |
| CN102001871A (en) * | 2009-12-15 | 2011-04-06 | 深圳市芭田生态工程股份有限公司 | Method for producing granulated compound fertilizer by granulating through urea tower |
| CN102757279A (en) * | 2011-04-26 | 2012-10-31 | 冯涛 | Water-soluble topdressing composite fertilizer |
| CN102320885B (en) * | 2011-08-17 | 2013-07-31 | 交城县金兰化工有限公司 | Spherical magnesium nitrate and tower granulation method thereof |
| CN104418637B (en) * | 2013-08-19 | 2019-03-08 | 深圳市芭田生态工程股份有限公司 | A kind of colorful slow release compound fertilizer and preparation method thereof |
| CN104710213A (en) * | 2014-12-31 | 2015-06-17 | 北方华锦化学工业集团有限公司 | Rounded grain potash fertilizer production method |
| CN105110984B (en) * | 2015-09-21 | 2019-02-12 | 曲沃县杰俊绿色果蔬种植专业合作社 | A kind of fertilizing method of grape |
| CN107626255A (en) * | 2017-09-22 | 2018-01-26 | 河南心连心化肥有限公司 | A kind of device and collocation method for configuring urea ammonium nitrate solution |
| CN108975957A (en) * | 2018-08-29 | 2018-12-11 | 交城县金兰化工有限公司 | A kind of preparation method of quicksand like four water-calcium nitrate |
| CN109734543A (en) * | 2019-03-24 | 2019-05-10 | 云南云天化股份有限公司 | A kind of production method of Mei Gai boron compound fertilizer |
| CN113620750A (en) * | 2021-09-01 | 2021-11-09 | 徐州市芭田生态有限公司 | Large-particle fertilizer and production process thereof |
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1999
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