EP0426783A1 - Procede pour fabriquer des materiaux pelletises destines a etre utilises dans des reactions chimiques dans l'industrie ou l'agriculture - Google Patents

Procede pour fabriquer des materiaux pelletises destines a etre utilises dans des reactions chimiques dans l'industrie ou l'agriculture

Info

Publication number
EP0426783A1
EP0426783A1 EP90905194A EP90905194A EP0426783A1 EP 0426783 A1 EP0426783 A1 EP 0426783A1 EP 90905194 A EP90905194 A EP 90905194A EP 90905194 A EP90905194 A EP 90905194A EP 0426783 A1 EP0426783 A1 EP 0426783A1
Authority
EP
European Patent Office
Prior art keywords
weight
pellets
water
magnesium
reaction
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP90905194A
Other languages
German (de)
English (en)
Inventor
Zbigniew Dr. Boguslawski
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AQUAMOT AG
Original Assignee
AQUAMOT AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by AQUAMOT AG filed Critical AQUAMOT AG
Publication of EP0426783A1 publication Critical patent/EP0426783A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
    • C—CHEMISTRY; METALLURGY
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • C05B—PHOSPHATIC FERTILISERS
    • C05B19/00—Granulation or pelletisation of phosphatic fertilisers, other than slag
    • C—CHEMISTRY; METALLURGY
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • C05D—INORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C; FERTILISERS PRODUCING CARBON DIOXIDE
    • C05D3/00—Calcareous fertilisers
    • C05D3/02—Calcareous fertilisers from limestone, calcium carbonate, calcium hydrate, slaked lime, calcium oxide, waste calcium products
    • C—CHEMISTRY; METALLURGY
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
    • C05G5/00—Fertilisers characterised by their form
    • C05G5/10—Solid or semi-solid fertilisers, e.g. powders
    • C05G5/12—Granules or flakes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/30—Wastewater or sewage treatment systems using renewable energies
    • Y02W10/37—Wastewater or sewage treatment systems using renewable energies using solar energy

Definitions

  • the invention relates to a process for the production of pelletized feedstocks for use in chemical conversion processes d industry • or agriculture, for example in the cleaning of municipal, industrial and private • wastewater, in fertilization or deacidification used for agricultural or forestry purposes or the like.
  • One of the main problems in the chemical reaction process is to control the reaction rate and in particular to regulate the amount of reagents used. This applies in particular to reaction processes in which water-soluble materials are used as reagents, the reaction material is still in an aqueous solution and one longer contact time between the reagent and the solution is unavoidable. This is the case, for example, in the deacidification of soils in agriculture and forestry and in a large number of chemical conversion processes in industry, for example in wastewater treatment.
  • the materials that are spread to improve the soil are permanently exposed to the effects of soil moisture, which is particularly the case during rainy periods leads to an excessive dissolution of the soil improvement with the consequence that on the one hand the materials used to improve the soil due to their oversupply themselves damage the gusts - z -
  • Biological processes are limited to one another by the fact that only substances that fit into the metabolism of the bacteria are recorded and absorbed and implemented in the biological system (aeration tank, trickling filter) within the retention time, i.e. be dismantled.
  • the biological system aseration tank, trickling filter
  • the biologically undetectable residual loads from the biological treatment processes will increase.
  • the chemical processes of wastewater treatment are of particular importance in the future protection of the aquatic part of our ecosystem.
  • E SS known for the neutralization of acid wastewater use so-called neutralization boxes, which are filled with a basic feed and into which the acidic solution drips, reacting with the reaction material during the more or less long residence time.
  • the main disadvantage of the known methods is, on the one hand, the high material consumption caused by complete saturation of the condensates and, moreover, in particular the fact that, on the one hand, high proportions of the neutralization material dissolve during the dwell time of the wastewater and thus lead to an excessive load and that in particular removal of the heavy metals contained in the wastewater is not possible. It is an object of the invention to provide a method which enables the production of feedstocks for use in chemical conversion processes with consumption regulated in a metered manner as a function of the desired conversion rate.
  • micro-coated build-up agglomeration Through the use of feed materials with an extremely different solubility product on the one hand and their pelletization in a specific granulation, to be referred to as "micro-coated build-up agglomeration", through the formation of initially pelletizing germs and their connection, a feed material is achieved which, upon contact with the Solution containing reactive substances is implemented in a targeted manner and in a quasi-buffered manner in such a way that the more easily soluble materials are protected from premature release and thus excessive accumulation in the solution by the more difficult to poorly soluble materials.
  • the formation of pellets ensures that the solution containing the reaction substances has a large contact area and thus the direct contact of the reaction substance which is usually only present in a large dilution in the solution with the reagent and thus its implementation is ensured.
  • Reaction material is available, but it is achieved by the special in particular in the outer layers of the germs and the pellets materials with extremely low solubility product targeted buffering, which excessive dissolution and thus i i same way as the acidification prevents environmentally harmful excessive neutralization (slow-release effect).
  • Another essential Before part of the invention is also to be seen in that, simultaneously with the New sewage treatment tralization a complete elimination of the heavy metals can be obtained, consisting in the gradual transition of the Abwas S ers from the acidic phase to the basic phase the solution precipitate into such particle sizes that they are initially physically bound to the surface of the pellets and can be collected in a special filter layer when washed out of the pellet bed.
  • the structure mentioned of germs and matrix material of different solubility products is of crucial importance, the achievement of which is the metered addition of the pelletizing water during their production.
  • the build-up granulation is based on the fact that, in view of the greatly reduced supply of pelletizing water in the nucleation phase, the surfaces of the more easily soluble mineral particles begin to dissolve, which thus preferably agglomerate with the binding of only small amounts of the less soluble material during dissolving of the surfaces of the particles of the less soluble material takes place at a much later time, so that after the end of the pelleting process, this material is predominantly in de outer layers including germs and residual amounts of non-pre-germinated material with greater solubility product.
  • pellets of 40 to 65 preferably 45 to 55% by weight of dolomite, 10 to 25, preferably 15, 20% by weight calcium carbonate, 2.5 to 7.5, preferably 4 5% by weight disodium monohydrogen phosphate, 2.5 and 7.7, preferably 4% by weight calcium hydrogen phosphate, 10 up to 15, preferably 6.5 to 7% by weight calcium hydroxide, 2.5 to 7.5, preferably 4.5 to 5.0% by weight bentonite, 1 to 5.0, preferably 2.5 3.0% by weight feldspar, 1.5 to 5.0, preferably 2.5 to 3.0% by weight potassium silicate, and 1.5 to 5.0, preferably 3.5% by weight magnesium oxide.
  • the pelleting is advantageously polidisperse, that is to say with widely differing sizes, with a proportion of small-grained material which is inversely proportional to the pH of the soil treating z.
  • the time and speed of action i.e. the time within which a soil with a pH of For example, 2 given the weather conditions to a pH between 6 and brought and then maintained at this value.
  • the pelleting of dolomite (calcium magnesium carbonate) with a solubility product of 2.6 x 10 ⁇ ⁇ for magnesium carbonate and 4.7 10 ⁇ * for calcium carbonate can buffer that in the nucleation phase instead of calcium hydroxide (solubility product 3.9 x 10 "*) magnesium hydroxide (1.5 x 10 ⁇ 12 ), aluminum hydroxide (1.9 x 10" 31 ) or iron hydroxide (5.0 x 10 -3 ”) as a binder uses and thereby specifically causes a more or less strong buffering of the active material, through which the dissolution of the material is delayed accordingly.
  • active bentonite and or sodium sulfate decahydrate for regulating the water balance in the soil, of which active bentonite is capable of storing water in an amount of 30 times its weight, while this sodium sulfate decahydrate congruently splits off its crystal water at a temperature of over 30 ° C.
  • an active substance can be added to the pellets, through which the plant absorbs the ozone which is absorbed by the leaves due to the sun's rays and which has a detrimental effect on the plant organ.
  • This can either be a buffer agent imparting a weakly alkaline reaction - pH> 7 - to the plant juices or an agrotechnologically justifiable catalyst, for example manganese sulfa (MnSO- *), which causes the decomposition of the ozone, the rate of decomposition increasing with increasing alkalinity of the solution (plant juice ) decreases.
  • MnSO- * manganese sulfa
  • active substances for the production of pellets for the removal of nitrogen impurities and in connection therewith phosphorus impurities and possibly heavy metals as use or.
  • phosphate salts of a cation of the 2nd main and subgroups of the periodic table (MeHPO), in particular magnesium hydrogen phosphate (MgHPO.), and / or phosphate salts, in particular the orthophosphate salts , a cation of the 2nd main and subgroups of the periodic table, in particular tri-magnesium-di-phosphate, the phosphate salt, in particular the orthophosphate forming one of the active substances, being synthesized in the first pelletizing stage in such a way that initially a partial amount of metal oxide is reacted with a sufficient amount of phosphoric acid for the reaction and then further magnesium oxide is added, whereupon after complete reaction the pelleting takes place using the magnesium hydroxide formed in the second reaction stage as a binder in conjunction with the excess water of reaction formed in the first reaction stage .
  • MeHPO magnesium hydrogen phosphate
  • / or phosphate salts in particular the orthophosphate salts , a cation of the 2nd main and subgroup
  • the process of the invention can furthermore be used with great advantage in the production of pellets for the neutralization of acids with, if appropriate, simultaneous removal of heavy metals.
  • the pelleting is expediently carried out in such a way that initially nuclei are formed with a nucleus essentially consisting of bases from the second main group of the periodic system, in particular magnesium hydroxide, and a coating of iron III hydroxide and the nuclei subsequently in pelletized in a matrix, pellets with different composition, ie in particular pellets with a different magnesium hydroxide / iron III hydroxide ratio can be formed, of which the pellets containing a high proportion of magnesium hydroxide of the (rapid ) Neutralization of the acids dissolved in the treated liquid and the pellets containing a higher proportion of iron-III-hydroxide serve the stronger inclusion (encapsulation) of magnesium hydroxide with the effect that in the neutralization phase with the aim of separating the heavy metals to a value above elevated pH to the more environmentally friendly value of about 7, 5 to
  • the weakly acidic effect of the iron hydroxide is based on the fact that the iron hydroxide is in the form of a trivalent hydrated iron ion, which is derived from this - - For gradually converting i Fe (H3J ⁇ ) s: (OH) * ⁇ .- with continuous elimination of hydrogen ions.
  • the pellets produced in this way that heavy metals contained in the solution precipitate out in the phase of the increased pH (> 9) and the precipitate a in colloidal form present iron hydroxide is adsorbed.
  • the invention is explained below using a few examples:
  • the mixture is homogenized intensively. Now 2.5 kg of water, 2.5 kg of magnesium oxide and 5.0 kg of white lime are added "and mixed intensively. After the exothermic reaction of the lime quenching has ended, the mixture is pelleted with the addition of 4.5 kg of pelletizing water until the germination stage, whereupon the final pelleting with the addition of a further 0.5 to 0.6 kg of water until the desired micro-coated germ-based pellet with a grain size of between 3 and 6 mm is formed, they contain water in an amount of approximately 2.0 to 2.2 kg, have a deactivating effect Ozone solutions show a pH in water of about 11.6, in acidic water - starting value 3.8 - a buffered value of 7.35.
  • pelletizing water is then added to the cooled reaction mass in three steps with constant pelleting, and initially an amount of about 2.75 kg, then after a time of about 1 minute another 1.35 kg. After a pelleting time of a further 10 minutes, pelletizing nuclei have formed which, after the addition of a further 1.35 k of pelleting water, are finally pelleted to pellets of a size between 3 mm and 6 m.
  • the moist pellets are powdered with about 2.5 kg of magnesium oxide and air-dried for 12 hours.
  • Pelletizing water processed into pellets which are suitable for pH adjustment.
  • the production takes place in the same, shown in example

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Engineering & Computer Science (AREA)
  • Hydrology & Water Resources (AREA)
  • Pest Control & Pesticides (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Processing Of Solid Wastes (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
  • Glanulating (AREA)
  • Removal Of Specific Substances (AREA)

Abstract

Dans le procédé décrit, des composés alcalins pulvérulents sont pelletisés avec des hydroxides de substances présentant des produits de solubilité différant considérablement. Dans une première phase, une faible quantité d'eau de pelletisation est ajoutée pour former des germes d'une granulométrie comprise entre 0,05 et 0,15 mm, qui se combinent pour former des pellets lors de l'adjonction d'une quantité supplémentaire d'eau de pelletisation. La quantité d'eau de pelletisation ajoutée au matériau dans cette première phase doit suffire à son hydratation mais ne doit pas être notablement plus importante. Après le commencement de la formation des germes, on n'ajoute plus d'eau jusqu'à ce que la matière première soit complètement hydratée et ce n'est qu'après que l'on ajoute la quantité d'eau de pelletisation nécessaire à la poursuite de la formation des germes. Pour fabriquer des pellets destinés à éliminer des impuretés azotées, conjointement avec des impuretés phosphorées et éventuellement des métaux lourds, les substances actives utilisées sont des phosphates d'hydrogène ou des phosphates d'un cation des deuxièmes groupes principal et auxiliaire du système périodique.
EP90905194A 1989-03-23 1990-03-21 Procede pour fabriquer des materiaux pelletises destines a etre utilises dans des reactions chimiques dans l'industrie ou l'agriculture Withdrawn EP0426783A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH1082/89A CH680586A5 (fr) 1989-03-23 1989-03-23
CH1082/89 1989-03-23

Publications (1)

Publication Number Publication Date
EP0426783A1 true EP0426783A1 (fr) 1991-05-15

Family

ID=4202037

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90905194A Withdrawn EP0426783A1 (fr) 1989-03-23 1990-03-21 Procede pour fabriquer des materiaux pelletises destines a etre utilises dans des reactions chimiques dans l'industrie ou l'agriculture

Country Status (4)

Country Link
EP (1) EP0426783A1 (fr)
CA (1) CA2029887A1 (fr)
CH (1) CH680586A5 (fr)
WO (1) WO1990011264A2 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4009082A1 (de) * 1990-03-21 1991-09-26 Aquamot Ag Verfahren zur reinigung von industriellen, landwirtschaftlichen oder privaten abwaessern von ihren verunreinigungen an ammoniumverbindungen
DE4324116A1 (de) * 1993-07-20 1995-01-26 Boguslawski Zbigniew Verfahren zur Reinigung von sauren oder alkalischen Abwässern und flüssigen Rohkondensaten, insbesondere der Kondensate aus Rauchgasen der mit fossilen Brennstoffen betriebenen Verbrennungsanlagen
DE19503599C2 (de) * 1995-02-03 2000-08-10 Eberhard Koenig Granulat mit Magnesiumhydrogenphosphat-3-Hydrat als Aktivkomponente, Verfahren zu dessen Herstellung sowie Verwendung des Granulates in der Abwasserreinigung
DE102006014601B4 (de) * 2006-03-29 2010-10-14 Grünbeck Wasseraufbereitung GmbH Verfahren, Vorrichtung, Behälter sowie Mittel zur Behandlung von saurem Kondenswasser aus Feuerungsanlagen
FR2946975B1 (fr) * 2009-06-18 2015-05-29 Dupoteau Catherine Journel Dispositif autonome de correction et neutralisation du ph d'une eau acide a l'aide de substances alcalinisantes a dissolution progressive et dependante du ph
LT5921B (lt) * 2011-06-13 2013-04-25 UAB "ARVI" ir ko Biriųjų sudėtinių trąšų gamybos būdas

Family Cites Families (10)

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Publication number Priority date Publication date Assignee Title
FR469685A (fr) * 1914-03-16 1914-08-06 Chaux-Magnesie Engrais-amendement
DE397474C (de) * 1922-07-04 1924-06-21 Waldhof Zellstoff Fab Verfahren zur Herstellung eines Duengemittels
DE880877C (de) * 1941-01-14 1953-06-25 Hoechst Ag Verfahren zur Herstellung eines Flockungsmittels fuer die Wasserreinigung
GB1199077A (en) * 1967-08-02 1970-07-15 Wintershall Ag Slow Release Potassium Containing Fertilisers
DE2529099A1 (de) * 1975-06-30 1977-01-27 Hans Heidenreich Abwasser-reinigungsmittel mit mineralischen reaktionsverzoegerern und verfahren zur herstellung dieser abwasser- reinigungsmittel
DE2626903A1 (de) * 1976-06-16 1977-12-29 Harzer Dolomitwerke Gmbh Verfahren zur herstellung eines granulierten langzeitduengemittels
DE2801034A1 (de) * 1978-01-11 1979-07-12 Hoechst Ag Flockungsmittel zur reinigung von abwaessern
SE7902651L (sv) * 1979-03-23 1980-09-24 Boliden Ab Flockningsmedel, forfarande for dess framstellning och dess anvendning
WO1987004452A1 (fr) * 1986-01-22 1987-07-30 Gattys Technique S.A. Matiere a repandre et son procede de production
DE3541184A1 (de) * 1985-11-21 1987-05-27 Kali & Salz Ag Verfahren zum granulieren von gesteins- und schlackenmehl mit kieserit

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9011264A2 *

Also Published As

Publication number Publication date
WO1990011264A3 (fr) 1990-11-15
WO1990011264A2 (fr) 1990-10-04
CA2029887A1 (fr) 1990-09-24
CH680586A5 (fr) 1992-09-30

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