WO1996009903A1 - Method of treating surface-contaminated (e.g. oil contaminated) sands, fine sands and coarse clays - Google Patents

Method of treating surface-contaminated (e.g. oil contaminated) sands, fine sands and coarse clays Download PDF

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Publication number
WO1996009903A1
WO1996009903A1 PCT/EP1995/003790 EP9503790W WO9609903A1 WO 1996009903 A1 WO1996009903 A1 WO 1996009903A1 EP 9503790 W EP9503790 W EP 9503790W WO 9609903 A1 WO9609903 A1 WO 9609903A1
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WIPO (PCT)
Prior art keywords
contaminated
fine
sands
grinding
attraction
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Application number
PCT/EP1995/003790
Other languages
German (de)
French (fr)
Inventor
Thomas Neesse
Original Assignee
Hans Huber Gmbh Maschinen- Und Anlagenbau
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Publication of WO1996009903A1 publication Critical patent/WO1996009903A1/en

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B03SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03BSEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B5/00Washing granular, powdered or lumpy materials; Wet separating
    • B03B5/02Washing granular, powdered or lumpy materials; Wet separating using shaken, pulsated or stirred beds as the principal means of separation
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B02CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02CCRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C17/00Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
    • B02C17/18Details
    • B02C17/20Disintegrating members
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B03SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03BSEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B9/00General arrangement of separating plant, e.g. flow sheets
    • B03B9/02General arrangement of separating plant, e.g. flow sheets specially adapted for oil-sand, oil-chalk, oil-shales, ozokerite, bitumen, or the like
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B09DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09CRECLAMATION OF CONTAMINATED SOIL
    • B09C1/00Reclamation of contaminated soil
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B09DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09CRECLAMATION OF CONTAMINATED SOIL
    • B09C1/00Reclamation of contaminated soil
    • B09C1/02Extraction using liquids, e.g. washing, leaching, flotation

Definitions

  • the invention relates to a method for processing surface-contaminated, e.g. oil-contaminated sands, fine sands and silt in the range of 20-200 ⁇ m, which are pre-cleaned by wet digestion and separation of the fine grain ⁇ 10 ⁇ m as well as organic components of low density.
  • it is a process for the treatment of oil sands that are heavily contaminated with mineral oils.
  • oil sands occur primarily as sand trap residues, in particular also from petrol stations or motor vehicle workshops.
  • the method should also be used to improve sand cleaning> 0.1 mm.
  • a cleaning process is known (WLB Wasser, Lucas und Boden 6, 1994, pages 76/77).
  • the sand trap residues are digested wet and, with the addition of surfactants as emulsifiers, fed to a two-stage attraction. This results in partial oil film detachment from the particle surface and an emulsion formation in the wash water. After the fine grain has been separated off, the washing water must be subjected to extensive emulsion splitting.
  • the invention is based on the object of simplifying a method of the type specified above with regard to technology, particularly with regard to wastewater treatment, wherein process steps previously considered necessary, such as oil recycling, should be avoided as far as possible. It is said to be practically residue-free be worked. Furthermore, the cleaning should also be extended to the fine grain range 20 ... 200 ⁇ m, which is not possible according to the prior art.
  • the highly thickened suspension is therefore subjected to a grinding attraction; a high-oil-containing fine grain phase is formed by the addition of solidly dispersed adsorbents or by the autogenous production of fine grain, which is separated from the cleaned sand or silt phase by a subsequent separation according to the density or grain size.
  • DE 41 40 845 A1 discloses a process for removing contaminants from contaminated soils by adding hydrophobic solids with a defined particle size distribution.
  • a hydrophobic solid which is not mechanically changed during the washing process
  • granular adsorption agent is put into a grinding attrition, i.e. there with finely ground, i.e. is changed mechanically.
  • this is of essential importance for the effect, because when the carrier material is ground, a fresh surface is formed with surface charges that have not set, which are particularly adsorption-intensive.
  • a complete process for the treatment of contaminated soils is also known from EP 0 313 116 A2: a slurry is placed in a rotary drum at the head of this technology. However, this has nothing to do with the grinding attraction according to the finding to do. Lumps of soil up to 200 mm are used as the input material, the separation of fine material and cleaned soil takes place at about 1 mm. The ball sizes for that process are diameters of 20 - 100 mm, which means completely different proportions! If the prior art is still directed towards the coarse grain, a solution for the fine and fine grain area is proposed according to the invention, which means a qualitatively new step, ie a cleaning of the otherwise rejected contaminated fine grain.
  • the secondary fine grain ⁇ 5-10 ⁇ m which is formed during the attraction is preferably diluted with water and subjected to desludging at 5-10 ⁇ m in hydrocyclones, centrifuges and hydroseparators.
  • the pre-cleaned sands or fine sands are subjected to an additional intensive attack, in which, for the adsorption of the oil, additionally finely dispersed particles in the range ⁇ 5-10 ⁇ m have to be crushed.
  • This fine grain can either be formed automatically by grinding the surface layer of the sand grains by grinding attrition, and / or an adsorbent with low density and good grindability is mixed in, which is finely ground during the attrition. It can be assumed that the fresh surface formed in the course of the grinding attraction is particularly adsorptive.
  • fine-grained metallic grinding media can be added to the attrition in stirring vessels, which remain in the grinding chamber while the attracted sand is discharged with the flow.
  • the micro grinding media can have a size of 0.2-2 mm.
  • the newly formed, highly contaminated fine grain is separated off in a subsequent classification process. This is followed by the solid / liquid separation of this flocculated fine grain.
  • the conventional attrition is additionally compared with the attrition grinding according to the invention, which consists in particular in peeling off the outer mineral layer.
  • a sand 315-1000 ⁇ was attracted - in a small-scale attraction system at a speed of 1400 per minute.
  • the energy requirement was 40 kWh / t with an attraction time of 20 minutes.
  • Grinding bodies with a diameter of 1.1 mm and a solid / water ratio of 2: 1 were used.
  • the graphic 1 shows the direct comparison of the attrition with the milling attrition under comparable process conditions. It can be seen that the fine grain abrasion ⁇ 10 ⁇ m could be increased from 1% to 8.5% with a grinding attrition. There was also an increase in the oil depletion in the grain fraction from 12% to 51%.
  • Sand with an oil content of 2517 mg / kg was attracted.
  • the cleaned material (coarse material) contained 950 mg / kg, while the highly contaminated fine grain contained 12620 mg / kg oil.
  • This silt in the grain size range of 20-200 ⁇ m is adjusted to a solid / liquid ratio of 1: 1 with make-up water 2 and fed to the attrition grinding 3.
  • the attrition grinding is intensified by the addition of micro-grinding bodies 4 with a grain size of 0.2-0.4 mm. In this case, no adsorbents are added.
  • the fine grain ⁇ 5 (10) ⁇ m is autogenously formed by the fine sand itself.
  • the attrited suspension is mixed with make-up water 5. thins and the sludge 6 fed. With a separating cut of approx.
  • a wastewater 8 with contaminated fine grain is separated into this slurry with a centrifuge or hydrocyclone or hydroseparator. Furthermore, a cleaned fine sand 7 ⁇ 200 ⁇ m is obtained as a thick sludge discharge.
  • the sludge discharge from the centrifuge 6 in the circuit 8 can be returned to the attraction grinding 3.

Abstract

The invention concerns a method of treating surface-contaminated, in particular oil-contaminated, sands, fine sands and coarse clays in the 20-200 νm range, the materials first undergoing preliminary cleaning by wet disintegration and separation of the finest grains < 10 νm) and low-density organic components. The proposed process is characterized by the fact that the highly concentrated suspension undergoes grinding in a stirring vessel containing microscopic grinding bodies (0.2-2 mm).

Description

Verfahren zur Aufbereitung oberflächenverunreinigter, z.B. ölverunreinigter Sande, Feinsande und Schluffe Process for the treatment of surface contaminated e.g. oil-contaminated sands, fine sands and silt
Die Erfindung betrifft ein Verfahren zur Aufbereitung oberflä¬ chenverunreinigter, z.B. ölverunreinigter Sande, Feinsande und Schluffe im Bereich von 20-200 μm, die durch Naßaufschluß und Abtrennung des Feinstkornes < 10 μm sowie organischer Bestand¬ teile geringer Dichte vorgereinigt sind. Insbesondere geht es um ein Verfahren zur Aufbereitung von ölsanden, die stark mit Mine¬ ralölen verunreinigt sind. Solche ölsande fallen vor allen Din¬ gen als Sandfangrückstände, insbesondere auch solche von Tank¬ stellen oder Kraftfahrzeugwerkstätten an. Das Verfahren soll sich aber auch für die Verbesserung der Sandreinigung > 0,1 mm anbieten.The invention relates to a method for processing surface-contaminated, e.g. oil-contaminated sands, fine sands and silt in the range of 20-200 μm, which are pre-cleaned by wet digestion and separation of the fine grain <10 μm as well as organic components of low density. In particular, it is a process for the treatment of oil sands that are heavily contaminated with mineral oils. Such oil sands occur primarily as sand trap residues, in particular also from petrol stations or motor vehicle workshops. The method should also be used to improve sand cleaning> 0.1 mm.
Bekannt ist ein Reinigungsverfahren (WLB Wasser, Luft und Boden 6, 1994, Seite 76/77). Bei diesem Verfahren werden die Sandfang¬ rückstände naß aufgeschlossen und unter Zugabe von Tensiden als E ulgatoren einer zweistufigen Attrition zugeführt. Dabei kommt es zu einer teilweisen Ölfilmablösung von der Teilchenoberfläche und zu einer Emulsionsbildung im Waschwasser. Nach Abtrennung des Feinkornes muß das Waschwasser einer aufwendigen Emulsions¬ spaltung unterzogen werden.A cleaning process is known (WLB Wasser, Luft und Boden 6, 1994, pages 76/77). In this process, the sand trap residues are digested wet and, with the addition of surfactants as emulsifiers, fed to a two-stage attraction. This results in partial oil film detachment from the particle surface and an emulsion formation in the wash water. After the fine grain has been separated off, the washing water must be subjected to extensive emulsion splitting.
Bekannt ist auch ein Verfahren (DE 3 910 842 AI), bei dem das in die wäßrige Phase überführte öl mit Hilfe von pulverförmigen Adsorptionsmitteln gebunden und in den Schlamm überführt wird. Dieses Verfahren kann angewendet werden, wenn relativ grobes Korn und ein hoher Anteil von freiem öl vorhanden ist. Nachtei¬ lig ist bei diesem Verfahren, daß ein hoher Aufwand besonders in der Abwasseraufbereitung betrieben wird und der Effekt der ein¬ zelnen Prozeßstufen hinsichtlich des Reinigungserfolges unbe¬ friedigend ist.Also known is a process (DE 3 910 842 AI) in which the oil transferred into the aqueous phase is bound with the aid of powdered adsorbents and transferred into the sludge. This method can be used when there is relatively coarse grain and a high proportion of free oil. The disadvantage of this process is that a high level of effort is involved, particularly in wastewater treatment, and the effect of the individual process stages is unsatisfactory with regard to the cleaning success.
Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren der oben angegebenen Art hinsichtlich der Technologie zu vereinfachen, besonders im Hinblick auf die Abwasserreinigung, wobei möglichst auf bisher als notwendig erachtete Prozeßstufen, wie das ölrecy- cling, verzichtet werden soll. Es soll praktisch rückstandsfrei gearbeitet werden. Weiterhin soll die Reinigung auch auf den Feinkornbereich 20 ... 200 μm ausgedehnt werden, was nach dem bisherigen Stand der Technik nicht möglich ist.The invention is based on the object of simplifying a method of the type specified above with regard to technology, particularly with regard to wastewater treatment, wherein process steps previously considered necessary, such as oil recycling, should be avoided as far as possible. It is said to be practically residue-free be worked. Furthermore, the cleaning should also be extended to the fine grain range 20 ... 200 μm, which is not possible according to the prior art.
Erreicht wird dies bei einem Verfahren der oben genannten Art überraschend dadurch, daß die hocheingedickte Suspension in einem Rührgefäß attritiert wird, in dem sich Mikromahlkörper der Größe von 0,2 - 2 mm befinden.This is surprisingly achieved in a method of the type mentioned above in that the highly thickened suspension is attracted in a stirring vessel in which there are micromilling bodies with a size of 0.2-2 mm.
Die hocheingedickte Suspension wird also einer mahlenden Attri- tion unterzogen; dabei wird durch Zusatz festdisperser Adsorp¬ tionsmittel bzw. durch autogene Erzeugung von Feinstkorn eine hochδlhaltige Feinkornphase gebildet, die durch eine anschlie¬ ßende Trennung nach der Dichte bzw. Korngröße von der gesäuber¬ ten Sand- bzw. Schluffphase abgetrennt wird.The highly thickened suspension is therefore subjected to a grinding attraction; a high-oil-containing fine grain phase is formed by the addition of solidly dispersed adsorbents or by the autogenous production of fine grain, which is separated from the cleaned sand or silt phase by a subsequent separation according to the density or grain size.
Wurde bei Behandlungen der eingangs genannten Art bisher noch kontaminiertes Feinkorn abgestoßen, das einer Reinigung unter¬ zogen werden mußte, so ist das Ergebnis gemäß der Erfindung überraschend.If contaminated fine grain which had to be subjected to cleaning has been rejected in treatments of the type mentioned at the outset, the result according to the invention is surprising.
Bekannt ist aus der DE 41 40 845 AI ein Verfahren zur Entfernung von Verunreinigungen aus kontaminierten Böden durch Zugabe hy¬ drophober Feststoffe mit definierter Korngrößenverteilung. Es geht aber ausschließlich um einen hydrophoben Feststoff, der während des Waschvorgangs mechanisch nicht verändert wird, wo¬ gegen erfindungsgemäß ja gerade körniges Adsoprtions ittel in eine mahlende Attrition gegeben, also dort mit feinstgemahlen, d.h. mechanisch verändert wird. Dies ist aber für den Effekt von wesentlicher Bedeutung, denn bei der Aufmahlung des Trägermate¬ rials wird frische Oberfläche mit nicht abgebundenen Oberflä¬ chenladungen gebildet, die besonders adsorptionsintensiv sind.DE 41 40 845 A1 discloses a process for removing contaminants from contaminated soils by adding hydrophobic solids with a defined particle size distribution. However, it is only a matter of a hydrophobic solid which is not mechanically changed during the washing process, whereas according to the invention, granular adsorption agent is put into a grinding attrition, i.e. there with finely ground, i.e. is changed mechanically. However, this is of essential importance for the effect, because when the carrier material is ground, a fresh surface is formed with surface charges that have not set, which are particularly adsorption-intensive.
Auch bekannt ist aus der EP 0 313 116 A2 ein komplettes Verfah¬ ren zur Aufbereitung von kontaminierten Böden: am Kopf dieser Technologie wird eine Aufschlämmung in eine Drehtrommel gegeben. Dies hat aber nichts mit der mahlenden Attrition gemäß der Er- findung zu tun. Als Einsatzmaterial werden Bodenbrocken bis 200 mm verwendet, die Trennung von Feingut und gereinigtem Boden erfolgt bei etwa 1 mm. Als Kugelgrößen für jenen Prozeß werden Durchmesser von 20 - 100 mm angegeben, also größenordnungsmäßig völlig andere Verhältnisse! Ist der Stand der Technik noch auf das Grobkorn gerichtet, so wird erfindungsgemäß eine Lösung für den Fein- und Feinstkornbereich vorgeschlagen, was einen quali¬ tativ neuen Schritt bedeutet, d.h. eine Reinigung des sonst abgestoßenen kontaminierten Feinkorns. Wesentlich ist die erfin¬ dungsgemäße Verwendung von Mikromahlkörpern in der Größe zwi¬ schen 0,2 und 2 mm. Bei dieser mahlenden Attrition in einer sol¬ chen Mikromahlkörperaufschlämmung gelingt es, Sand > 0,1 mm und Feinsandteilchen im Bereich zwischen 20 und 200 μm zu attritie- ren, wobei ausschließlich Feinstkorn im Bereich < 5 - 10 μm unter speziellen Bedingungen gebildet werden kann. Die Kunst besteht dabei darin, so zu verfahren, daß keine tatsächlichen Kornbrüche auftreten, sondern daß nur die oberste Teilchen¬ schicht definitionsgemäß abgerieben wird.A complete process for the treatment of contaminated soils is also known from EP 0 313 116 A2: a slurry is placed in a rotary drum at the head of this technology. However, this has nothing to do with the grinding attraction according to the finding to do. Lumps of soil up to 200 mm are used as the input material, the separation of fine material and cleaned soil takes place at about 1 mm. The ball sizes for that process are diameters of 20 - 100 mm, which means completely different proportions! If the prior art is still directed towards the coarse grain, a solution for the fine and fine grain area is proposed according to the invention, which means a qualitatively new step, ie a cleaning of the otherwise rejected contaminated fine grain. What is essential is the use according to the invention of micromilling bodies in the size between 0.2 and 2 mm. With this grinding attraction in such a micro grinding slurry it is possible to attract sand> 0.1 mm and fine sand particles in the range between 20 and 200 μm, whereby only fine particles in the range <5 - 10 μm can be formed under special conditions. The trick is to proceed in such a way that no actual grain breaks occur, but that only the uppermost particle layer is rubbed off by definition.
Vorzugsweise wird das bei der Attrition gebildete Sekundär¬ feinstkorn < 5 - 10 μm mit Wasser verdünnt und einer Entschläm- mung bei 5 - 10 μm in Hydrzyklonen, Zentrifugen und Hydrosepara- toren unterzogen.The secondary fine grain <5-10 μm which is formed during the attraction is preferably diluted with water and subjected to desludging at 5-10 μm in hydrocyclones, centrifuges and hydroseparators.
Besonders zweckmäßig ist es, wenn in das Attritionsgefäß Zusätze festdisperser leicht zerkleinerbarer Adsorptionsmittel zugegeben werden und im Zuge der Attrition ebenfalls auf eine Korngröße < 5 - 10 μm zerkleinert werden.It is particularly expedient if additions of solidly dispersible, easily comminuted adsorbents are added to the attraction vessel and are also comminuted to a particle size of <5-10 μm in the course of the attraction.
Mit der Maßnahme nach der Erfindung kann man wesentlich intensi¬ ver arbeiten, hohe Verunreinigungsgrade an den Teilchenoberflä¬ chen werden beherrscht, die umfangreichen Aufwendungen für die Abwasserreinigung durch Emulsionsspaltung oder andere Verfahren der Abwasserreinigung können überraschend umgangen werden.With the measure according to the invention it is possible to work much more intensively, high levels of contamination on the particle surfaces are mastered, the extensive outlay for wastewater treatment by emulsion splitting or other wastewater treatment processes can be surprisingly avoided.
Erfindungsgemäß werden also nach der üblichen nassen Vorreini¬ gung mit den Prozeßstufen Naßaufschluß, Siebung, Hydrozyklon- trennung die vorgereinigten Sande bzw. Feinsande einer zusätzli¬ chen Intensivattrition unterzogen, bei der für die Adsorption des Öls zusätzlich feindisperse Teilchen im Bereich < 5 - 10 μm zerkleinert werden müssen. Dieses Feinstkorn kann entweder auto¬ gen gebildet werden, indem durch Mahlattrition die Oberflächen¬ schicht der Sandkörner abgerieben wird, und/oder es wird ein Adsorptionsmittel mit geringer Dichte und guter Mahlbarkeit zugemischt, das bei der Attrition fein gemahlen wird. Dabei ist davon auszugehen, daß die im Verlaufe der mahlenden Attrition gebildete frische Oberfläche besonders adsorptionsaktiv ist.According to the invention, after the usual wet pre-cleaning with the process stages wet digestion, sieving, hydrocyclone separation, the pre-cleaned sands or fine sands are subjected to an additional intensive attack, in which, for the adsorption of the oil, additionally finely dispersed particles in the range <5-10 μm have to be crushed. This fine grain can either be formed automatically by grinding the surface layer of the sand grains by grinding attrition, and / or an adsorbent with low density and good grindability is mixed in, which is finely ground during the attrition. It can be assumed that the fresh surface formed in the course of the grinding attraction is particularly adsorptive.
Zur Intensivierung des Attritionsprozesses im Sinne einer mah¬ lenden Attrition können bei der Attrition in Rührgefäßen fein¬ körnige metallische Mahlkörper zugegeben werdebn, die im Mahl¬ raum verbleiben, während der attritierte Sand mit der Strömung ausgetragen wird.In order to intensify the attrition process in the sense of a grinding attrition, fine-grained metallic grinding media can be added to the attrition in stirring vessels, which remain in the grinding chamber while the attracted sand is discharged with the flow.
Die Mikromahlkörper können eine Größe von 0,2 - 2 mm haben.The micro grinding media can have a size of 0.2-2 mm.
Das neu gebildete hochkontaminierte Feinstkorn wird in einem anschließenden Klassierprozeß abgetrennt. Daran schließt sich die Fest-/Flüssigtrennung dieses geflockten Feinstkornes an.The newly formed, highly contaminated fine grain is separated off in a subsequent classification process. This is followed by the solid / liquid separation of this flocculated fine grain.
Wesentlich gegenüber dem bisherigen Stand der Technik ist, daß das öl auschließlich an eine feinkörnige Phase gebunden wird und somit in den Schlamm vollständig ausgebracht wird. Es war nicht vorhersehbar, daß man auf ein ölrecycling völlig verzichten kann. Wesentlich wird die Reinigung durch Intensivattrition unter Erzeugung von Feinstkorn innerhalb des Reinigungsverfah¬ rens erreicht.It is essential compared to the previous state of the art that the oil is bound exclusively to a fine-grained phase and is therefore completely discharged into the sludge. It was not foreseeable that oil recycling could be completely avoided. The cleaning is essentially achieved by intensive intensification with the production of very fine particles within the cleaning process.
Besonders günstig ist es hinsichtlich des Attritionsaufwandes, wenn die nach der Klassierung gesäuberte Sand- bzw. Schluffphase im Teilstrom wieder zur mahlenden Attrition zurückgeführt wird.It is particularly favorable with regard to the effort required for the attraction if the sand or silt phase cleaned after the classification is returned to the grinding attraction in the partial flow.
Wichtig ist auch, daß ohne den Zusatz von Tensiden gearbeitet werden kann. Beispielsweise Ausführungsformen der Erfindung sollen nun mit Bezug auf die beiliegenden Bilder näher erläutert werden, ohne die Erfindung in irgendeiner Weise zu beschränken.It is also important that you can work without the addition of surfactants. For example, embodiments of the invention will now be explained in more detail with reference to the accompanying pictures, without restricting the invention in any way.
Im Beispiel 1 wird zusätzlich auch die herkömmliche Attrition mit der Attritionsmahlung nach der Erfindung, die insbesondere im Abschälen der äußeren Mineralschicht besteht, verglichen bzw. dieser gegenübergestellt.In example 1, the conventional attrition is additionally compared with the attrition grinding according to the invention, which consists in particular in peeling off the outer mineral layer.
Beispiel 1example 1
Attritiert wurde ein Sand 315-1000 μ - in einer kleintechnischen Attritionsanlage bei einer Drehzahl von 1400 pro Minute. Der Energiebedarf betrug bei einer Attritionszeit von 20 Minuten 40 kWh/t. Es wurden Mahlkörper von 1,1 mm Durchmesser bei einem Feststoff/Wasserverhältnis von 2:1 verwendet. Die Graphik 1 zeigt den unmittelbaren Vergleich der Attrition mit der Mahl¬ attrition unter vergleichbaren Prozeßbedingungen. Man sieht, daß der Feinkornabrieb < 10 μm bei einer Mahlattrition von 1 % auf 8,5 % gesteigert werden konnte. Ebenso ergab sich eine Steige¬ rung der ölabreicherung in der Kornfraktion von 12 % auf 51 %. Attritiert wurde ein Sand mit einem ölgehalt von 2517 mg/kg. Das gereinigte Gut (Grobgut) enthielt 950 mg/kg, während das hoch¬ kontaminierte Feinstkorn 12620 mg/kg öl enthielt.A sand 315-1000 μ was attracted - in a small-scale attraction system at a speed of 1400 per minute. The energy requirement was 40 kWh / t with an attraction time of 20 minutes. Grinding bodies with a diameter of 1.1 mm and a solid / water ratio of 2: 1 were used. The graphic 1 shows the direct comparison of the attrition with the milling attrition under comparable process conditions. It can be seen that the fine grain abrasion <10 μm could be increased from 1% to 8.5% with a grinding attrition. There was also an increase in the oil depletion in the grain fraction from 12% to 51%. Sand with an oil content of 2517 mg / kg was attracted. The cleaned material (coarse material) contained 950 mg / kg, while the highly contaminated fine grain contained 12620 mg / kg oil.
Beispiel 2Example 2
Als Vorlauf liegt hier ein vorgereinigter, d.h. bei 20 μm ent¬ schlammter Feinsand 1 vor. Dieser Schluff im Korngrößenbereich von 20 - 200 μm wird mit Zusatzwasser 2 auf ein Fest/Flüssig¬ verhältnis von 1:1 eingestellt und der Attritionsmahlung 3 zu¬ geführt. Die Attritionsmahlung wird intensiviert durch die Zu¬ gabe von Mikromahlkörpern 4 mit einer Korngröße von 0,2 - 0,4 mm. Auf die Zugabe von Adsorptionsmitteln wird in diesem Fall verzichtet. Das Feinstkorn < 5 (10) μm wird hier autogen durch den Feinsand selbst gebildet. Im Anschluß an die Attritionsmah¬ lung 3 wird die attritierte Suspension mit Zusatzwasser 5 ver- dünnt und der Entschlämmung 6 zugeführt. In diese Einschlämmung mit Zentrifuge oder Hydrozyklon oder Hydroseparator wird bei einem Trennschnitt von ca. 5 (10) μm ein Abwasser 8 mit kontami¬ niertem Feinstkorn abgetrennt. Weiterhin fällt als Dickschlam- maustrag ein gereinigter Feinsand 7 < 200 μm an. Zur Verhinde¬ rung einer Übermahlung kann der Schlammaustrag der Zentrifuge 6 im Kreislauf 8 zur Attritionsmahlung 3 zurückgeführt werden. A pre-cleaned fine sand 1, that is to say desludged at 20 μm, is present as the lead. This silt in the grain size range of 20-200 μm is adjusted to a solid / liquid ratio of 1: 1 with make-up water 2 and fed to the attrition grinding 3. The attrition grinding is intensified by the addition of micro-grinding bodies 4 with a grain size of 0.2-0.4 mm. In this case, no adsorbents are added. The fine grain <5 (10) μm is autogenously formed by the fine sand itself. Following the attrition grinding 3, the attrited suspension is mixed with make-up water 5. thins and the sludge 6 fed. With a separating cut of approx. 5 (10) μm, a wastewater 8 with contaminated fine grain is separated into this slurry with a centrifuge or hydrocyclone or hydroseparator. Furthermore, a cleaned fine sand 7 <200 μm is obtained as a thick sludge discharge. In order to prevent over-grinding, the sludge discharge from the centrifuge 6 in the circuit 8 can be returned to the attraction grinding 3.

Claims

Patentansprüche claims
1. Verfahren zur Aufbereitung oberflächenverunreinigter, ins¬ besondere ölverunreinigter Sande, Feinsande und Schluffe im Bereich von 20 - 200 μm, die durch Naßaufschluß und Abtrennung des Feinstkornes < 10 μm sowie organischer Bestandteile geringer Dichte vorgereinigt sind, dadurch gekennzeichnet, daß die hoch¬ eingedickte Suspension in einem Rührgefäß attritiert wird, in dem sich Mikromahlkörper der Größe von 0,2 - 2 mm befinden.1. Process for the preparation of surface-contaminated, in particular oil-contaminated sands, fine sands and silt in the range from 20 to 200 μm, which are pre-cleaned by wet digestion and separation of the fine grain <10 μm and organic components of low density, characterized in that the highly thickened Suspension is attracted in a stirring vessel in which there are micro-grinding bodies with a size of 0.2-2 mm.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß das bei der Attrition gebildete Sekundärfeinstkorn < 5 - 10 μm mit Wasser verdünnt wird und einer Entschlämmung bei 5 - 10 μm in Hydrozyklonen, Zentrifugen oder Hydroseparatoren unterzogen wird.2. The method according to claim 1, characterized in that the secondary fine grain formed in the attraction <5 - 10 microns is diluted with water and subjected to a desludging at 5 - 10 microns in hydrocyclones, centrifuges or hydroseparators.
3. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß in das Attritionsgefäß Zusätze festdisperser, leicht zerkleiner¬ barer Adsorptionsmittel zugegeben werden und im Zuge der Attri¬ tion ebenfalls auf eine Korngröße < 5 - 10 μm zerkleinert wer¬ den.3. The method according to claim 1, characterized in that additions of solidly dispersed, easily crushable adsorbent are added to the attraction vessel and are also crushed to a grain size of <5 - 10 μm in the course of the attraction.
4. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die nach der Klassierung gesäuberte Feinsand- bzw. Schluffphase im Teilstrom wieder zur attritierten Mahlung zurückgeführt wird.4. The method according to claim 1, characterized in that the fine sand or silt phase cleaned after classification is returned to the attrited grinding in the partial flow.
5. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die durch Klassierung abgeschiedenen Feinstschlämme anschließend durch Flockung, Sedimentation, Filtration abgeschieden werden und die wäßrige Phase in den Verfahrenskreislauf zurückgeführt wird. 5. The method according to claim 1, characterized in that the fine sludge separated by classification are then separated by flocculation, sedimentation, filtration and the aqueous phase is returned to the process cycle.
PCT/EP1995/003790 1994-09-27 1995-09-25 Method of treating surface-contaminated (e.g. oil contaminated) sands, fine sands and coarse clays WO1996009903A1 (en)

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DE4434531 1994-09-27
DEP4434531.3 1994-09-27

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WO1999052656A3 (en) * 1998-04-09 2000-01-06 Bertwin Langenecker Decontaminating contaminated soil and sludge
EP0997202A2 (en) * 1998-10-30 2000-05-03 Kabushiki Kaisha Kumagaigumi Method and system for carrying out treatment of granular substances with pollutants adhered

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DE19740842A1 (en) * 1997-09-17 1999-03-18 Dortmunder Gusasphalt Gmbh & C Reprocessing of building material containing harmful chemicals
DE19907513C1 (en) * 1999-02-22 2000-08-10 Akw Apparate Verfahren Process for purifying granular material e.g. oil-contaminated sand comprises adjusting the solids content in the attritor by removing coarse material and by controlled recycling of this coarse fraction for addition to the attrition vessel

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WO1999052656A3 (en) * 1998-04-09 2000-01-06 Bertwin Langenecker Decontaminating contaminated soil and sludge
EP0997202A2 (en) * 1998-10-30 2000-05-03 Kabushiki Kaisha Kumagaigumi Method and system for carrying out treatment of granular substances with pollutants adhered
EP0997202A3 (en) * 1998-10-30 2002-09-25 Kabushiki Kaisha Kumagaigumi Method and system for carrying out treatment of granular substances with pollutants adhered

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