CN100383091C - Granulating Method in tower type for producing complex fertilizer of nitrogen, phosphor and potass - Google Patents
Granulating Method in tower type for producing complex fertilizer of nitrogen, phosphor and potass Download PDFInfo
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- CN100383091C CN100383091C CNB2004100990366A CN200410099036A CN100383091C CN 100383091 C CN100383091 C CN 100383091C CN B2004100990366 A CNB2004100990366 A CN B2004100990366A CN 200410099036 A CN200410099036 A CN 200410099036A CN 100383091 C CN100383091 C CN 100383091C
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Abstract
The present invention relates to a method for producing a compound fertilizer containing nitrogen, phosphate and potassium through a tower type granulation, which comprises the steps of mixing melting urea bodies or low eutectic bodies containing urea with ammonium phosphate and potassium salts in a middle groove for melting objects so as to generate melting fertilizer slurry containing the suspended substances of the ammonium phosphate and the potassium salts, the melting urea bodies, the ammonium phosphate and the potassium salts have the proportion by weight of (1 to 5): 1: (1 to 3), and the temperature of the slurry is from 100 to 135 DEG C. The slurry is dispersed into small droplets by a granulation device positioned on the top of a granulation tower, and the small droplets fall down under the action of gravitation and buoyancy and contacts reverse cold air entering from the bottom of the granulation tower so that the small droplets are cooled and solidified into fertilizer granules The method directly uses the melting urea bodies to produce a granular mixed compound fertilizer without the need of drying; therefore, production processes are simplified, energy consumption is reduced, granulation rate is high, the surfaces of the granules are smooth, the uniformity of nutrient components is favorable, operational environment is good, and the production processes can be carried out without waste water, waste residue or waste gas.
Description
Technical field
The present invention relates to a kind of production method of NPK compound fertilizer, particularly relating to a kind of is the method for the melt material tower granulation production granular nitrogen PK compound fertilizer of nitrogenous source with urea.
Background technology
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.The production method of composite fertilizer has granulating method, slurry process, melting method, extrusion process and blending method etc., and they are that base fertilizer such as urea, ammonium chloride, coarse whiting, phosphorus ammonium, Repone K, vitriolate of tartar etc. are carried out the high concentration compound fertilizer that secondary processing is made various nutrient elements such as containing nitrogen, phosphorus, potassium.China's composite fertilizer production is based on granulating method.
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 these production methods, the plain material of the nitrogen of molten state or phosphorus only adds sylvite or other solid materials is produced granular nitrogen phosphorus potassium complex fertilizer product.By the difference of granulation mode, fused mass granulating legal system compound fertilizer process 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.
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 plant are normally maximum and be the equipment the most expensive, that energy consumption is the highest in the production equipment, and the fused mass granulating technique drying-free has been saved investment and energy consumption.
Prilling tower sprinkling pelleting process application is the granulation of single nitrogenous fertilizer (as urea, ammonium nitrate etc.) the earliest, the most widely, has now expanded the granulation of nitrogen phosphorus and NPK compound 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.
The technical process of Holland Stamicarbon B.V. prilling tower sprinkling pelleting explained hereafter nitric acid ammonium-potassium phosphate is (" phosphoric acid, phosphate fertilizer and a composite fertilizer ", Jiang Shanxiang etc. write, Chemical Industry Press, 1999): concentration is 47～55% nitric acid and 52～54%P
2O
5Phosphoric acid by wet process mix after, send into neutralizer and neutralize with ammonia, the nitric acid ammonium phosphate solution of generation is evaporated to water content about 1.8% in the single-effect evaporator of natural circulation, temperature is that 170 ℃ Melt Pump is delivered to the header tank that the top is taken in granulation.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, blend 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 finished product particle is sent to the warehouse packing.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 state-run mining company of Holland (Solids Handling and Metering an NPK PrillingPlant " Proceedings of the Fertilizer Society " London.1994.) has done improvement to above-mentioned technology, to produce nitric acid ammonium-potassium phosphate composite fertilizer, it is 25-9-9 that plant-scale production equipment has been produced specification, 22-11-11, the NPK compound 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 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 ℃.Mixing time must be very short, because muriate can play the decomposition that katalysis impels ammonium nitrate.
Norway Hydro (" Phosphorus; Potassium " (76): 48) with fusing urea (water content about 0.3%) with after entering the mixing tank mixing together through solid phosphoric acid one ammonium of preheating, Repone K (when producing urea ammonium phosphate 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.All need not to cool off with this explained hereafter urea ammonium phosphate and urea ammonium phosphate potassium.Pilot plant was once produced the particulate 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.
Summary of the invention
The invention provides a kind of method that adopts tower granulation production NPK compound fertilizer.Present method is directly utilized factory that makes urea's urea strong solution or melt, or the fused solution of solid urea, and with water content very low melt attitude slurry pelleting, drying-free in the production process has been simplified Production Flow Chart, has saved energy consumption.In addition, in the inventive method also the nutrient demand of visual crop add a certain amount of moderate-element compound or trace compound, make the granular nitrogen PK compound fertilizer that contains various nutrient elements.
The principle of the inventive method is: the characteristics that can form eutectic mixture according to urea and Repone K (vitriolate of tartar) or phosphorus ammonium, make fusion fertilizer slurry with good fluidity, this slip sprays by prilling granulator and is dispersed into small droplets, under gravity and buoyancy, land, contact with the cold air flow that enters under tower is reverse, produce the heat and mass effect each other, cooling curing is a small-particle, promptly obtains the granular nitrogen PK compound fertilizer.
The present invention realizes like this.The method of tower granulation production NPK compound fertilizer of the present invention may further comprise the steps:
(1) urea melt or contain the urea eutectic and phosphorus ammonium and sylvite mix in the melts medial launder, generation contains the fusion fertilizer slurry of phosphorus ammonium and sylvite suspended substance, the weight ratio of urea melt and phosphorus ammonium and sylvite is 1～5: 1: 1～3, and the temperature of fusion fertilizer slurry is 100～135 ℃
Described urea melt is urea plant flash evaporator outlet, the concentration urea melt greater than 99 weight %,
Described urea melt is behind the solid urea heating and melting, temperature is 135～145 ℃ urea melt,
The described urea eutectic that contains is the eutectic that solid urea and Repone K are heated to 100～125 ℃ of generations together, and the add-on of Repone K is 1～35 weight %,
Described urea melt or to contain the urea eutectic be with being pumped to the melts medial launder at prilling tower top,
In the described fusion fertilizer slurry, can also add weighting agent when mixed melting, the weighting agent add-on is 0～25 weight % of fertilizer total amount,
Described phosphorus ammonium, sylvite, weighting agent use the solids raised equipment lifting to the prilling tower top,
Described phosphorus ammonium, sylvite, weighting agent can separate or be heated to 80～140 ℃ together,
(2) the fusion fertilizer slurry is separated into small droplets by the prilling granulator of granulation cat head, lands under gravity and buoyancy, with reverse contact of cold air flow that enters from prilling tower bottom, cools off and is cured as the granular nitrogen PK compound fertilizer.
The described phosphorus ammonium of the inventive method is a monoammonium phosphate, and described sylvite is Repone K or vitriolate of tartar, and described weighting agent is ground dolomite or the Paris white of granularity less than 0.5mm.
The described prilling tower of the inventive method is circular Steel Concrete tower or steel structure tower, and the spray of prilling tower highly is 30～80m, and the internal diameter of tower is 10～24m.
The inventive method can be by improving the ability of heat exchange in the prilling tower top force ventilated mode of installation shaft flow fan, the cooling curing when helping fertiliser granulates and descending in prilling tower.
The described solids raised equipment of the inventive method is selected from bucket elevator, elevator, hoisting equipment or pneumatic conveyer.
The described prilling granulator of the inventive method is rotary differential shower nozzle.
Though the trace element that farm crop need seldom, the quality that improves crop yield and improve crop is had certain effect.The inventive method can add moderate-element compound or trace compound when preparation fusion fertilizer slurry, in obtaining containing, the granular nitrogen PK compound fertilizer of trace element.
Described moderate-element compound is selected from calcium cpd, magnesium compound, sulphur compound; Described trace compound is selected from boron compound, copper compound, iron cpd, manganic compound, molybdenum compound, zn cpds.
Described moderate-element compound is selected from calcium sulfate, nitrocalcite, sal epsom, potassium magnesium sulfate, sulphur; Described trace compound is selected from 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.
Amount and trace compound can preheatings before adding or directly join in the fertilizer slurry without preheating in a spot of, mix granulation afterwards.
The method of employing tower granulation production NPK compound fertilizer of the present invention compared with prior art has the following advantages:
1, the inventive method can directly be utilized the work in-process in the urea plant urea synthesis---urea strong solution or melt, has simplified Production Flow Chart, and investment cost and process cost are lower, can change the single disadvantage of urea plant kind simultaneously.
2, fusion tower granulation technology can make full use of the heat energy of original urea melt, and moisture content of material is very low, and the drying-free process has been saved energy consumption.Technology is simple, and qualified product particle percentage composition is very high, and the returning charge amount is few in the production process, and the product particle surface is slick and sly, prevented from caking, and can produce the high nitrogen compound fertilizer that conventional production of compound fertilizer technology is difficult to production.
3, the inventive method also can add moderate-element compound or trace compound when preparation fusion fertilizer slurry, makes the composite fertilizer that contains multiple middle amount, trace element, to adapt to the requirement of Different Crop, soil, weather.
4, the inventive method 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.
Embodiment 1
Get urea plant flash evaporator outlet urea soln or melt 200g, concentration is greater than 99 weight %, about 140 ℃ of temperature, the adding granularity is less than 1.0mm and be preheated to about 105 ℃ monoammonium phosphate 100g, Repone K 58g, mix about 2min, make the fusion fertilizer slurry that contains phosphorus ammonium and sylvite suspended substance, 115～120 ℃ of slurry temperatures, the slip that contains suspended solid is separated into small droplets by prilling granulator, is 10m from the tower internal diameter, spray highly is that the Steel Concrete granulation cat head of 40m falls, conduct heat and mass transfer with upstream, cool off and be cured as the pellet of 1～4mm, be granular nitrogen PK compound fertilizer product, this product contains N 28.5%, P
2O
512.1%, K
2O 9.5%, H
2O0.3%, the granule strength of product greater than 25 newton/.
Embodiment 2
Get urea plant flash evaporator outlet urea soln 200g, concentration 99 weight %, about 135 ℃ of temperature, add granularity respectively less than 1.0mm and be preheated to about 110 ℃ monoammonium phosphate 80g, granularity is less than 1.0mm and be preheated to about 120 ℃ Repone K 125g, granularity is less than 0.5mm and be preheated to about 120 ℃ ground dolomite 25g, the solid materials monoammonium phosphate, Repone K and weighting agent ground dolomite are to be promoted to the granulation cat head with bucket elevator, and be preheated to respectively to join in the urea soln again after the certain temperature and mix, mix about 4min, make the fusion fertilizer slurry that contains phosphorus ammonium and sylvite suspended substance, 120～125 ℃ of slurry temperatures, slip is separated into small droplets by prilling granulator, from the tower internal diameter is 24m, spray highly is that the Steel Concrete granulation cat head of 80m falls, and conducts heat and mass transfer with upstream, cools off and be cured as the pellet of 1～4mm, obtain granular nitrogen-potassium composite fertilizer product, this product contains N 23.1%, P
2O
58.0%, K
2O 17.2%, H
2O 0.2%, the granule strength of product greater than 40 newton/.
Embodiment 3
Solid urea 300g, be heated to 136 ℃ and become fused solution, granularity is less than the monoammonium phosphate 150g of 1.0mm, Repone K 150g, ground dolomite 30g, boric acid 3g, magnesium sulfate heptahydrate 9g, the solid materials monoammonium phosphate, Repone K, ground dolomite, boric acid, magnesium sulfate heptahydrate is delivered to the granulation cat head by gas delivery equipment respectively, be preheating to about 105 ℃ after, join in the molten urea solution respectively, mix 2～3min, make the fusion fertilizer slurry that contains phosphorus ammonium and sylvite suspended substance, 110～115 ℃ of slurry temperatures, the slip that contains suspended solid is dispersed into small droplets by rotary differential shower nozzle, from the tower internal diameter is 10m, spray highly is that the steel construction granulation cat head of 30m falls, conduct heat and mass transfer with upstream, cool off and be cured as the pellet of 1～4mm, obtain containing N 24.0%, P
2O
510.2%, K
2O 13.5%, H
2O 0.3%, NPK compound fertilizer, this fertilizer contains magnesium, sulphur moderate-element and micronutrient boron.
Embodiment 4
Solid urea 300g, Repone K 30g, be heated to 120 ℃ and become fused solution, granularity is less than the monoammonium phosphate 150g of 1.0mm, Repone K 100g, copper sulfate 4g, ammonium molybdate 4g, the solid materials monoammonium phosphate, Repone K, copper sulfate, ammonium molybdate is delivered to the granulation cat head by windlass respectively, be preheating to about 110 ℃ after, join in the fused solution together, mix about 2min, make the fusion fertilizer slurry that contains phosphorus ammonium and sylvite suspended substance, about 115 ℃ of slurry temperature, this material is separated into small droplets by prilling granulator, from the tower internal diameter is 15m, spray highly for falling in the Steel Concrete prilling tower of 60m, conducts heat and mass transfer with upstream, cools off and be cured as the pellet of 1～4mm, obtain the granular nitrogen PK compound fertilizer, this product contains N 26.0%, P
2O
512.6%, K
2O13.3%, H
2O 0.5%, contains sulphur moderate-element and trace copper and molybdenum simultaneously.
Embodiment 5
Solid urea 200g, being heated to 145 ℃ becomes fused solution, and granularity is preheating to about 100 ℃ less than the monoammonium phosphate 100g of 1.0mm; Granularity is less than 0.5mm vitriolate of tartar 200g, calcium sulfate 10g, zinc sulfate 4g, manganous sulfate 4g, be preheating to about 125 ℃ together after; Join respectively in the molten urea solution, mix about 2min after, make the fusion fertilizer slurry that contains phosphorus ammonium and sylvite suspended substance, 120～135 ℃ of slurry temperatures.Solid materials urea, monoammonium phosphate, vitriolate of tartar, calcium sulfate, zinc sulfate, manganous sulfate by elevator hoist to the granulation cat head.The slip that contains suspended solid is separated into small droplets by rotary differential shower nozzle, from the tower internal diameter is that 20m, spray highly fall for the Steel Concrete granulation cat head of 70m, conduct heat and mass transfer with upstream, cool off and be cured as the pellet of 1～4mm, obtain granular nitrogen PK compound fertilizer product, this product contains N 20.1%, P
2O
510.3%, K
2O 19.7%, H
2O 0.25%, contains calcium, sulphur, zinc moderate-element and trace element simultaneously.
Embodiment 6
Solid urea 300g, be heated to 140 ℃ and become fused solution, add granularity respectively less than 1.0mm and be preheating to about 100 ℃ monoammonium phosphate 80g, granularity less than 1.0mm and be preheating to about 110 ℃ of vitriolate of tartar 200g and granularity less than 0.5mm and be preheating to about 110 ℃ of Paris white 50g, after mixing about 3min, make the fusion fertilizer slurry that contains phosphorus ammonium and sylvite suspended substance, 110～115 ℃ of slurry temperatures.Solid materials urea, monoammonium phosphate, vitriolate of tartar, Paris white are promoted to the granulation cat head by windlass respectively.The slip that contains suspended solid disperses to become small droplets by rotary differential shower nozzle, from the tower internal diameter is that 12m, spray highly fall for the steel construction granulation cat head of 50m, conduct heat and mass transfer with upstream, cool off and be cured as the pellet of 1～4mm, obtain granular nitrogen PK compound fertilizer product, this product contains N 22.9%, P
2O
55.4%, K
2O 16.1%, H
2O0.25%.
Embodiment 7
Solid urea 200g, Repone K 10g, be heated to 125 ℃ and become fused solution, granularity is less than 1.0mm and be preheating to about 90 ℃ monoammonium phosphate 200g, granularity is less than 1.0mm and be preheating to about 130 ℃ of Repone K 200g and ground dolomite 90g, joins respectively in the molten urea solution, mixes about 4min, make the fusion fertilizer slurry that contains phosphorus ammonium and sylvite suspended substance, 115～120 ℃ of slurry temperatures.Solid materials urea, monoammonium phosphate, Repone K, ground dolomite are promoted to the granulation cat head by bucket elevator.The slip that contains suspended solid disperses to become small droplets by rotary differential shower nozzle, from the tower internal diameter is that 10m, spray highly fall for the Steel Concrete granulation cat head of 30m, conduct heat and mass transfer with upstream, cool off and be cured as the pellet of 1～4mm, obtain granular nitrogen PK compound fertilizer product, this product contains N 16.4%, P
2O
513.9%, K
2O 18.2%, H
2O 0.2%.
Claims (8)
1. the method for a tower granulation production NPK compound fertilizer is characterized in that this method may further comprise the steps:
(1) urea melt or contain the urea eutectic and phosphorus ammonium and sylvite mix in the melts medial launder, generation contains the fusion fertilizer slurry of phosphorus ammonium and sylvite suspended substance, the weight ratio of urea melt and phosphorus ammonium and sylvite is 1～5: 1: 1～3, and the temperature of fusion fertilizer slurry is 100～135 ℃
Described urea melt is urea plant flash evaporator outlet, the concentration urea melt greater than 99 weight %,
Described urea melt is behind the solid urea heating and melting, temperature is 135～145 ℃ urea melt,
The described urea eutectic that contains is the eutectic that solid urea and Repone K are heated to 100～125 ℃ of generations together, and the add-on of Repone K is 1～35 weight %,
Described phosphorus ammonium is a monoammonium phosphate, and described sylvite is Repone K or vitriolate of tartar,
Described urea melt or to contain the urea eutectic be with being pumped to the melts medial launder at prilling tower top,
In the described fusion fertilizer slurry, can also add weighting agent when mixed melting, described weighting agent is ground dolomite or Paris white, and the weighting agent add-on is 0～25 weight % of fertilizer total amount,
Described phosphorus ammonium, sylvite, weighting agent use the solids raised equipment lifting to the prilling tower top,
Described phosphorus ammonium, sylvite, weighting agent can separate or be heated to 80～140 ℃ together,
(2) the fusion fertilizer slurry is separated into small droplets by the prilling granulator of granulation cat head, lands under gravity and buoyancy, with reverse contact of cold air flow that enters from prilling tower bottom, cools off and is cured as the granular nitrogen PK compound fertilizer.
2. method according to claim 1 is characterized in that: the granularity of described weighting agent ground dolomite or Paris white is less than 0.5mm.
3. method according to claim 1 is characterized in that: described prilling tower is circular Steel Concrete tower or steel structure tower, and the spray of prilling tower highly is 30～80m, and the internal diameter of tower is 10～24m.
4. method according to claim 1 is characterized in that: described solids raised equipment is selected from bucket elevator, elevator, hoisting equipment or pneumatic conveyer.
5. method according to claim 1 is characterized in that: described prilling granulator is rotary differential shower nozzle.
6. method according to claim 1 is characterized in that: when preparation fusion fertilizer slurry, can add moderate-element compound or trace compound, in obtaining containing, the granular nitrogen PK compound fertilizer of trace element.
7. method according to claim 7 is characterized in that: described moderate-element compound is selected from calcium cpd, magnesium compound, sulphur compound; Described trace compound is selected from boron compound, copper compound, iron cpd, manganic compound, molybdenum compound, zn cpds.
8. according to claim 7 or 8 described methods, it is characterized in that: described moderate-element compound is selected from calcium sulfate, nitrocalcite, sal epsom, potassium magnesium sulfate, sulphur; Described trace compound is selected from 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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| CN102503640B (en) * | 2011-10-29 | 2014-05-14 | 史丹利化肥股份有限公司 | Special functional melt granulated humic acid fertilizer and production method thereof |
| CN102491855B (en) * | 2011-11-25 | 2013-07-24 | 史丹利化肥股份有限公司 | Zinc-rich efficient slow release special corn fertilizer and preparation method thereof |
| CN102491833B (en) * | 2011-11-25 | 2013-09-25 | 史丹利化肥股份有限公司 | Special melt granulation fertilizer for leaf vegetables and preparation method thereof |
| CN106748545A (en) * | 2017-02-16 | 2017-05-31 | 云南磷化集团有限公司 | A kind of plateau containing selenium apple specialing fertilizer and preparation method thereof |
| CN109133994A (en) * | 2018-08-29 | 2019-01-04 | 交城县金兰化工有限公司 | Spherical calcium nitrate and its tower granulation method |
| 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 |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1280972A (en) * | 1999-12-29 | 2001-01-24 | 化学工业部上海化工研究院 | process for preparing high-concentration granular composite N-K fertilizer |
| CN1365959A (en) * | 2002-01-31 | 2002-08-28 | 周建军 | Process for preparing high-concentration compound N-P-K fertilizer by tower-type granulating |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1280972A (en) * | 1999-12-29 | 2001-01-24 | 化学工业部上海化工研究院 | process for preparing high-concentration granular composite N-K fertilizer |
| CN1365959A (en) * | 2002-01-31 | 2002-08-28 | 周建军 | Process for preparing high-concentration compound N-P-K fertilizer by tower-type granulating |
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