WO2020228905A1 - Ammoniumsulfat enthaltendes düngemittel-granulat sowie vorrichtung, verfahren und stoffgemisch zur dessen herstellung - Google Patents
Ammoniumsulfat enthaltendes düngemittel-granulat sowie vorrichtung, verfahren und stoffgemisch zur dessen herstellung Download PDFInfo
- Publication number
- WO2020228905A1 WO2020228905A1 PCT/DE2020/100402 DE2020100402W WO2020228905A1 WO 2020228905 A1 WO2020228905 A1 WO 2020228905A1 DE 2020100402 W DE2020100402 W DE 2020100402W WO 2020228905 A1 WO2020228905 A1 WO 2020228905A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- mixture
- ammonium sulfate
- calcium carbonate
- mass
- crystalline ammonium
- Prior art date
Links
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 title claims abstract description 53
- 229910052921 ammonium sulfate Inorganic materials 0.000 title claims abstract description 51
- 235000011130 ammonium sulphate Nutrition 0.000 title claims abstract description 51
- 239000000203 mixture Substances 0.000 title claims abstract description 39
- 239000008187 granular material Substances 0.000 title claims abstract description 35
- 239000003337 fertilizer Substances 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 11
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims abstract description 50
- 229910000019 calcium carbonate Inorganic materials 0.000 claims abstract description 26
- 229910001868 water Inorganic materials 0.000 claims abstract description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 23
- 238000005469 granulation Methods 0.000 claims description 21
- 230000003179 granulation Effects 0.000 claims description 21
- 239000000126 substance Substances 0.000 claims description 20
- 238000002156 mixing Methods 0.000 claims description 15
- 239000001166 ammonium sulphate Substances 0.000 claims description 10
- 230000008569 process Effects 0.000 claims description 10
- 238000000227 grinding Methods 0.000 claims description 8
- 238000011144 upstream manufacturing Methods 0.000 claims description 2
- 239000000463 material Substances 0.000 description 19
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 13
- 238000001035 drying Methods 0.000 description 12
- 239000000243 solution Substances 0.000 description 12
- 239000004571 lime Substances 0.000 description 10
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 9
- 235000011941 Tilia x europaea Nutrition 0.000 description 9
- 239000007858 starting material Substances 0.000 description 8
- 230000007480 spreading Effects 0.000 description 6
- 238000003892 spreading Methods 0.000 description 6
- 238000003860 storage Methods 0.000 description 6
- 229910021529 ammonia Inorganic materials 0.000 description 5
- 238000009826 distribution Methods 0.000 description 5
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 4
- 239000000654 additive Substances 0.000 description 4
- 230000000996 additive effect Effects 0.000 description 4
- 238000001704 evaporation Methods 0.000 description 4
- 230000008020 evaporation Effects 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- 238000002425 crystallisation Methods 0.000 description 3
- 230000008025 crystallization Effects 0.000 description 3
- 238000011038 discontinuous diafiltration by volume reduction Methods 0.000 description 3
- 235000015097 nutrients Nutrition 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000006227 byproduct Substances 0.000 description 2
- JYYOBHFYCIDXHH-UHFFFAOYSA-N carbonic acid;hydrate Chemical compound O.OC(O)=O JYYOBHFYCIDXHH-UHFFFAOYSA-N 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000010790 dilution Methods 0.000 description 2
- 239000012895 dilution Substances 0.000 description 2
- 239000002552 dosage form Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- JBKVHLHDHHXQEQ-UHFFFAOYSA-N epsilon-caprolactam Chemical compound O=C1CCCCCN1 JBKVHLHDHHXQEQ-UHFFFAOYSA-N 0.000 description 2
- 238000000855 fermentation Methods 0.000 description 2
- 230000004151 fermentation Effects 0.000 description 2
- 238000011049 filling Methods 0.000 description 2
- 229910000856 hastalloy Inorganic materials 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 230000008719 thickening Effects 0.000 description 2
- 238000009736 wetting Methods 0.000 description 2
- LRDIEHDJWYRVPT-UHFFFAOYSA-N 4-amino-5-hydroxynaphthalene-1-sulfonic acid Chemical compound C1=CC(O)=C2C(N)=CC=C(S(O)(=O)=O)C2=C1 LRDIEHDJWYRVPT-UHFFFAOYSA-N 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000013067 intermediate product Substances 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 229910001092 metal group alloy Inorganic materials 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000001863 plant nutrition Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05C—NITROGENOUS FERTILISERS
- C05C3/00—Fertilisers containing other salts of ammonia or ammonia itself, e.g. gas liquor
- C05C3/005—Post-treatment
Definitions
- Fertilizer granules containing ammonium sulphate as well as device, method and
- the invention relates to a fertilizer granulate containing ammonium sulfate and to a device, a method and a mixture of substances for its production.
- a device for thickening organic substrates with an external heat exchanger is known from German patent application 10 2017 118 356.
- the vapor produced during thickening contains ammonia, which is converted into ammonium sulphate and concentrated in a vapor scrubber by adding sulfuric acid.
- the ammonium sulfate solution obtained in this way can be used as fertilizer.
- ammonium sulfate solution (abbreviated ASL) must first be dried so that a slightly moist, crystalline ammonium sulfate is obtained.
- ASL ammonium sulfate solution
- German patent application 10 2016 220 648 discloses an ammonium sulphate-containing fertilizer granulate with a metal salt as a granulation additive. These granules are produced with a fluidized bed granulator.
- the starting material is crystalline ammonium sulfate, which is a by-product of caprolactam production or from coal stoves.
- the process consists in mixing the ammonium sulphate with an additive, which leads to significantly reduced dust formation during granulation. In addition, this addition should bring about a high pressure and shock resistance of the resulting granules.
- the liquid mixture is fed into a fluidized bed granulation unit via a spray device, where it is processed into solid granules.
- US Patent 4,589,904 also teaches the granulation of crystalline ammonium sulfate.
- the granulator is fed via four feed devices with a) crystalline ammonium sulfate (BY-PRODUCT A / S) with a fine size, with b) an ammonium sulfate solution (A / S H20
- the granulator consists of a Hastelloy Metal alloy dilution tube.
- the A / S water additive solution (or A / S acid additive water solution) is fed to the sprinkler located in the Hastelloy dilution pipe.
- gaseous anhydrous ammonia is fed to the ammonia sprinkler, which is also located in the granulator.
- the object of the invention is therefore to provide a simple composite
- This object is achieved with a device for the production of a fertilizer granulate containing ammonium sulfate, which has an inclined, rotatable tube as a drum generator, a fan heater which is arranged so that the hot air flow is guided from the end of the drum to its entrance and a metering device for the supply of crystalline ammonium sulfate mixed with calcium carbonate.
- Calcium carbonate granulation is achieved through a rotatable pipe that is open on both sides, for example a metal pipe, without further additional equipment such as sprinklers or other wetting systems and without additional downstream drying devices.
- This simple structure of the granulating device already enables the production of granulate fertilizer that can be used with conventional spreading devices.
- An advantageous embodiment of the invention is that the metering device is preceded by a mixing device with a first inlet for crystalline ammonium sulfate and a second inlet for calcium carbonate.
- the mixing device can advantageously be preceded by a pre-classifier and an intermediate grinding stage.
- a pre-classifier and an intermediate grinding stage.
- conglomerates of crystalline ammonium sulfate that are too large can first be sieved out and crushed in the intermediate grinding stage.
- a vacuum dryer with an integrated mixing device can also be used as a mixing device. This is advantageous because drying and mixing can be carried out in one container.
- Hot air return device is provided with a condenser and a heat exchanger. This means that the hot air loaded with moisture as it flows through the drum can be dehumidified again and then heated up so that there is always sufficient dry hot air available for drying during the granulation.
- the task of providing a granulatable substance mixture is achieved with a method in which a moist substance mixture of water and crystalline ammonium sulfate, with a dry substance content of 85% to 95% by mass, preferably 89% to 91%, is mixed with calcium carbonate so that the proportion of calcium carbonate in the mixture of substances is between 15% and 40% by mass, preferably 20% to 32%.
- the granulation can advantageously take place in a drum granulator, with a
- Hot air flow is guided in countercurrent through the tube, in particular with a
- the hot air stream exiting at the inlet of the drum granulator TG is dehumidified and then heated and circulated again through the drum granulator.
- the object of the invention is finally achieved by a mixture of substances consisting of water and crystalline ammonium sulphate, with a dry matter content of 85% to 95%, preferably 89% to 91%, and calcium carbonate, the proportion of calcium carbonate in the mixture of water and crystalline ammonium sulphate between 15% and 40%
- Mass fraction preferably 20% to 32%, is.
- the fertilizer granules claimed by the invention consist of crystalline
- Figure 1 shows an apparatus for producing an ammonium sulfate containing
- FIG. 2 shows an apparatus for producing an ammonium sulfate containing
- FIG. 3 shows an apparatus for producing an ammonium sulfate containing
- the devices shown schematically according to Figures 1 and 2 both have a drum granulator TG, which essentially consists of an elongated, rotatably mounted tube, at the end of which a hot air blower H is attached so that the hot air flow from the material outlet to the material inlet is guided through the tube "Attached to its end" does not mean that the hot air blower is mechanically connected to the pipe.
- the drum granulator TG which is essentially an elongated pipe, is shown horizontally, but in fact it is arranged at an angle. The rotation of the pipe is effected by a controllable or regulatable actuator, not shown here, the speed of which can be changed.
- the moisture of the starting material mixture, the material composition of the starting material mixture, the residence time in the pipe and the thermal energy input determine the process.
- the dwell time depends on the inclination, the length, the degree of filling, the drive speed and the charging method.
- the drum granulator TG is fed via an upstream metering device D with the mixture of substances described in more detail below.
- the metering device D can be, for example, a continuous conveyor with a pouring height limiter or a screw conveyor.
- the pouring height limiter can for example be a stripping plate which is attached above the continuous conveyor so that behind this stripping plate the material only has the height provided by the stripping plate.
- the dosed material feed, the speed and the angle of inclination of the pipe can regulate drying and the formation of grain shape and size distribution will.
- the dump height limiter in connection with the continuous conveying means ensures that the drum granulator TG is fed with material in portions.
- the majority of the substance mixture to be granulated is in a cascade movement at a defined filling level.
- the diligent air introduced at the material outlet absorbs the moisture bound to the material as it flows through the drum. Due to the cascade movement in connection with the resulting material mixing, the residual moisture is absorbed by the hot air stream and transported away. Due to the thermal energy introduced, the liquid bridges between the grains solidify like a solid, so that storage-stable and scatterable granules are created.
- the moist air exiting at the entrance of the drum granulator TG is cooled with the aid of the condenser K (dashed line L5).
- the moisture contained in the air flow condenses into water, which is discharged via a condensate outlet KA.
- a heat exchanger W connected downstream of the condenser K then raises the temperature level of the air flow again, so that its water absorption capacity is additionally increased.
- the axial fan used as a hot air blower H the hot air thus generated is added to the granulation process again.
- Granules with a grain size of 3 mm to 5 mm are drawn off with the aid of the lower screen deck of the finishing classifying device F via line L2 and fed to a packing station A.
- Granules with a grain size of less than 3 mm are collected separately in the packing station A via line L3.
- the fine grain fraction can be used when spreading of the fertilizer of the fraction between 3 mm and 5 mm are added proportionally, so that a granulate grain distribution that is suitable for the respective purpose is created. It is also conceivable that the fine grain fraction can be used separately as small amounts for household needs.
- the mixture of substances for the granulation is produced as follows.
- the ammonium sulfate solution generated, for example, from fermentation residue evaporation in a biogas plant is first fed to a vacuum dryer VT.
- the vacuum-tight container is double-walled, for example.
- the intermediate volume is flowed through by hot water via the supply and return lines VL, RL, so that the introduced solution is heated inside the container. Due to the thermal energy that acts, the water contained evaporates at a given pressure level, for example between 20 mbar and 250 mbar.
- the vapor stream is returned to an existing digestate evaporation GRV, for example, via the dashed line L4.
- the vacuum dryer VT Due to the volume reduction caused by the evaporation, the vacuum dryer VT is refilled cyclically, so that the volume-specific heat transfer surface and the inter-material heat transfer remain maximally usable.
- a spiral stirrer WR integrated in the VT vacuum dryer ensures that the ammonium sulphate solution is constantly rearranged and mixed. As soon as a state is reached in which the volume of the material corresponds to a desired dry matter content of 85% to 95%, preferably 89% to 91%, no more ammonium sulfate solution is added. The material is then dehumidified to the desired dry matter content.
- the vacuum dryer VT is batch-wise
- Calcium carbonate is supplied from the lime silo S.
- the spiral stirrer WR which keeps the increasingly concentrated suspension of crystalline ASL + water in suspension during the drying, ensures that the material is mixed with the calcium carbonate.
- the fine-grained lime particles are deposited around the
- Vacuum dryer VT returned.
- the pre-dried ammonium sulfate solution ASL is transferred to the mixing device M via the line L12 and, depending on the composition and the desired moisture content, mixed with water via the line L9 and with calcium carbonate xo «1mm from the silo S via the line L10.
- the carbonate of lime used in connection with the available moisture enables the material to develop interparticle
- the exemplary embodiment according to FIG. 3 differs from that according to FIG. 2 in the freeing position of the substance mixture for the granulation.
- the metering device D is preceded by a mixer M, a pre-classifier VK and an intermediate grinding stage ZM.
- the starting material that is fed to the pre-classification VK is pre-dried using a drying and crystallization unit TK, which is only shown schematically in FIG.
- TK drying and crystallization unit
- the ammonium sulfate solution predried in the drying and crystallization unit TK is temporarily stored on a suitable drainage dump EH.
- the crystalline intermediate product is dewatered to a steady moisture content by sedimentation.
- the heap rests on a water-permeable grate plate R.
- the interparticle freely available water flows through the pile structure, is collected below the grate R and can be fed to the mixer M via the line III if required.
- Described drying and crystallization unit TK and the dewatering heap EH can also be used in the embodiment of FIG.
- the crystalline ammonium sulfate additionally dehydrated in this way is withdrawn from the dewatering heap via line L6 and fed to the pre-classification VK. Any agglomerates formed are deposited as oversized grains and one
- the intermediate grinding stage ZM supplied via line L7.
- the intermediate grinding stage ZM can, for example, be in the form of a hammer mill or impact mill or similar
- Shredding machines be executed.
- the resulting comminution product is returned to the pre-classification VK, so that a grinding cycle is created, with the help of which coarse grain is avoided.
- the crystalline ammonium sulfate pre-screened in the pre-classification VK is then transferred to the mixing device M and depending on the composition and the desired
- Embodiment oversized granulate is returned from the final classifier F via the line LI to the intermediate grinding stage ZM.
- the starting material mixture for the production of the fertilizer by means of the granulation described is produced by thermal drying of the, for example, from the
- Fermentation residue evaporation GRV of a biogas plant obtained ammonium sulfate solution.
- the moist mixture of water and crystalline ammonium sulfate obtained in this way is mixed with calcium carbonate at a dry matter content of 85% to 95% by mass, preferably 89% to 91%. This creates a moist, coarse-grained one
- Dry matter content to over 98% by mass.
- the residual moisture contained is materially bound and can only be unlocked by strong additional thermal stress.
- the resulting granulate is therefore stable to classification and storage and can be spread.
- Substance proportions, the material residence time, the thermal energy input during mixing (substance proportions) or the granulation of the material - as described above - the size distribution can be controlled so that the proportion of granules with a diameter of less than / equal to 8 mm is around 95% by mass amounts.
- the generated granules can thus easily be used with the common agricultural
- the lines LI, L2, L3, L6, L7 L8 can be pipelines, although conveying means such as belt conveyors, screws, etc. are usually provided. L2 and L3 could also be downspouts.
- the line L4 is a pipe for discharging the vapor.
- L5 is an air duct. Those skilled in the art will employ the appropriate means as needed.
- the material composition of the fertilizer granulate obtained consists of: H20 less than or equal to 2%, (NH4) 2S04 between 78% and 63%, CaC03 between 22% and 35% (all proportions in mass% (mass percentage)
- the fertilizer can be spread without any problems using the common spreading technology
- the nutrients can be applied to the cultivation areas in a much more targeted manner
- the manufacturing process is completely emission-free.
- the solid-like granulate dosage form makes the material resistant compared to a temperature-dependent shift in the pFI value, the ammonia emissions being considerably reduced compared to ASL.
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Fertilizers (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE112020002369.9T DE112020002369A5 (de) | 2019-05-15 | 2020-05-12 | Ammoniumsulfat enthaltendes Düngemittel-Granulat sowie Vorrichtung, Verfahren und Stoffgemisch zur dessen Herstellung |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102019112681.9 | 2019-05-15 | ||
DE102019112681.9A DE102019112681A1 (de) | 2019-05-15 | 2019-05-15 | Ammoniumsulfat enthaltendes Düngemittel-Granulat sowie Vorrichtung, Verfahren und Stoffgemisch zur dessen Herstellung |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2020228905A1 true WO2020228905A1 (de) | 2020-11-19 |
Family
ID=71620101
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE2020/100402 WO2020228905A1 (de) | 2019-05-15 | 2020-05-12 | Ammoniumsulfat enthaltendes düngemittel-granulat sowie vorrichtung, verfahren und stoffgemisch zur dessen herstellung |
Country Status (2)
Country | Link |
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DE (2) | DE102019112681A1 (de) |
WO (1) | WO2020228905A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN113213509A (zh) * | 2021-04-26 | 2021-08-06 | 聊城市鲁西化工工程设计有限责任公司 | 一种硫酸铵溶液提浓干燥系统与工艺、应用 |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR786985A (fr) * | 1934-06-23 | 1935-09-14 | Ig Farbenindustrie Ag | Procédé pour préparer des engrais composés à partir du sulfate d'ammonium et decarbonates alcalino-terreux |
GB462244A (en) * | 1935-09-02 | 1937-03-02 | Ig Farbenindustrie Ag | Improvements in the manufacture and production of granular fertilisers |
DE2150916A1 (de) * | 1970-10-14 | 1972-04-20 | Fisons Ltd | Verfahren zur Granulierung |
US4589904A (en) | 1984-09-25 | 1986-05-20 | Tennessee Valley Authority | Granulation of crystalline by-product ammonium sulfate |
USH980H (en) * | 1989-05-11 | 1991-11-05 | Tennessee Valley Authority | Two-stage, single-unit, and energy-efficient granulator dryer |
CN107216190A (zh) * | 2017-05-24 | 2017-09-29 | 四川金象赛瑞化工股份有限公司 | 一种稳定的硝硫基钙镁肥生产方法 |
DE102016220648A1 (de) | 2016-10-20 | 2018-04-26 | Thyssenkrupp Ag | Ammoniumsulfat enthaltendes Granulat |
DE102017118356A1 (de) | 2017-08-11 | 2019-03-14 | Biogastechnik Süd GmbH | Vorrichtung zur Eindickung von organischen Substraten mit externem Wärmetauscher |
DE102018104877A1 (de) | 2018-03-03 | 2019-09-05 | Biogastechnik Süd GmbH | Vorrichtung und Verfahren zur Trocknung von Feststoff- Flüssigkeits- Gemischen |
-
2019
- 2019-05-15 DE DE102019112681.9A patent/DE102019112681A1/de not_active Withdrawn
-
2020
- 2020-05-12 WO PCT/DE2020/100402 patent/WO2020228905A1/de active Application Filing
- 2020-05-12 DE DE112020002369.9T patent/DE112020002369A5/de not_active Withdrawn
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR786985A (fr) * | 1934-06-23 | 1935-09-14 | Ig Farbenindustrie Ag | Procédé pour préparer des engrais composés à partir du sulfate d'ammonium et decarbonates alcalino-terreux |
GB462244A (en) * | 1935-09-02 | 1937-03-02 | Ig Farbenindustrie Ag | Improvements in the manufacture and production of granular fertilisers |
DE2150916A1 (de) * | 1970-10-14 | 1972-04-20 | Fisons Ltd | Verfahren zur Granulierung |
US4589904A (en) | 1984-09-25 | 1986-05-20 | Tennessee Valley Authority | Granulation of crystalline by-product ammonium sulfate |
USH980H (en) * | 1989-05-11 | 1991-11-05 | Tennessee Valley Authority | Two-stage, single-unit, and energy-efficient granulator dryer |
DE102016220648A1 (de) | 2016-10-20 | 2018-04-26 | Thyssenkrupp Ag | Ammoniumsulfat enthaltendes Granulat |
CN107216190A (zh) * | 2017-05-24 | 2017-09-29 | 四川金象赛瑞化工股份有限公司 | 一种稳定的硝硫基钙镁肥生产方法 |
DE102017118356A1 (de) | 2017-08-11 | 2019-03-14 | Biogastechnik Süd GmbH | Vorrichtung zur Eindickung von organischen Substraten mit externem Wärmetauscher |
DE102018104877A1 (de) | 2018-03-03 | 2019-09-05 | Biogastechnik Süd GmbH | Vorrichtung und Verfahren zur Trocknung von Feststoff- Flüssigkeits- Gemischen |
Non-Patent Citations (1)
Title |
---|
SLUIJMAN, C.M.J.: "Der Einfluß von Düngemitteln auf den Kalkzustand des Bodens", ZEITSCHRIFT FÜR PFLANZENERNÄHRUNG UND BODENKUNDE, 27 October 1969 (1969-10-27), pages 97 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN113213509A (zh) * | 2021-04-26 | 2021-08-06 | 聊城市鲁西化工工程设计有限责任公司 | 一种硫酸铵溶液提浓干燥系统与工艺、应用 |
Also Published As
Publication number | Publication date |
---|---|
DE112020002369A5 (de) | 2022-02-03 |
DE102019112681A1 (de) | 2020-11-19 |
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