DE4426711A1 - Chemical and morphological transformation of asbestos material - Google Patents
Chemical and morphological transformation of asbestos materialInfo
- Publication number
- DE4426711A1 DE4426711A1 DE4426711A DE4426711A DE4426711A1 DE 4426711 A1 DE4426711 A1 DE 4426711A1 DE 4426711 A DE4426711 A DE 4426711A DE 4426711 A DE4426711 A DE 4426711A DE 4426711 A1 DE4426711 A1 DE 4426711A1
- Authority
- DE
- Germany
- Prior art keywords
- asbestos
- treatment
- hydrolysis
- agent according
- derivatives
- 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- Withdrawn
Links
- 239000010425 asbestos Substances 0.000 title claims abstract description 34
- 229910052895 riebeckite Inorganic materials 0.000 title claims abstract description 34
- 239000000463 material Substances 0.000 title claims abstract description 15
- 239000000126 substance Substances 0.000 title claims abstract description 6
- 230000006740 morphological transformation Effects 0.000 title abstract 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 16
- 230000007062 hydrolysis Effects 0.000 claims abstract description 12
- 238000006460 hydrolysis reaction Methods 0.000 claims abstract description 12
- 150000002148 esters Chemical class 0.000 claims abstract description 8
- 239000011248 coating agent Substances 0.000 claims abstract description 7
- 235000012239 silicon dioxide Nutrition 0.000 claims abstract description 5
- 238000003980 solgel method Methods 0.000 claims abstract description 5
- 239000002245 particle Substances 0.000 claims abstract description 4
- 230000035515 penetration Effects 0.000 claims abstract description 4
- 230000006735 deficit Effects 0.000 claims abstract description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 15
- 239000000835 fiber Substances 0.000 claims description 12
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 claims description 10
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical class O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 7
- 238000005470 impregnation Methods 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 230000000877 morphologic effect Effects 0.000 claims description 3
- -1 silicic acid ester Chemical class 0.000 claims description 3
- 239000000377 silicon dioxide Substances 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 239000002904 solvent Substances 0.000 claims description 2
- 239000003795 chemical substances by application Substances 0.000 claims 9
- 238000007598 dipping method Methods 0.000 claims 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims 1
- 150000003377 silicon compounds Chemical class 0.000 claims 1
- 238000005507 spraying Methods 0.000 claims 1
- 150000004703 alkoxides Chemical class 0.000 abstract description 2
- 125000005624 silicic acid group Chemical class 0.000 abstract 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 8
- 235000019441 ethanol Nutrition 0.000 description 7
- 238000000576 coating method Methods 0.000 description 4
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 4
- 230000002378 acidificating effect Effects 0.000 description 3
- 239000004566 building material Substances 0.000 description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 description 3
- 239000011707 mineral Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 229910052910 alkali metal silicate Inorganic materials 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000011777 magnesium Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 230000007903 penetration ability Effects 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 235000019353 potassium silicate Nutrition 0.000 description 2
- 230000009257 reactivity Effects 0.000 description 2
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- CWBIFDGMOSWLRQ-UHFFFAOYSA-N trimagnesium;hydroxy(trioxido)silane;hydrate Chemical compound O.[Mg+2].[Mg+2].[Mg+2].O[Si]([O-])([O-])[O-].O[Si]([O-])([O-])[O-] CWBIFDGMOSWLRQ-UHFFFAOYSA-N 0.000 description 2
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 description 1
- 239000011398 Portland cement Substances 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000006482 condensation reaction Methods 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 231100001261 hazardous Toxicity 0.000 description 1
- DKAGJZJALZXOOV-UHFFFAOYSA-N hydrate;hydrochloride Chemical compound O.Cl DKAGJZJALZXOOV-UHFFFAOYSA-N 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- 229910001425 magnesium ion Inorganic materials 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62D—CHEMICAL MEANS FOR EXTINGUISHING FIRES OR FOR COMBATING OR PROTECTING AGAINST HARMFUL CHEMICAL AGENTS; CHEMICAL MATERIALS FOR USE IN BREATHING APPARATUS
- A62D3/00—Processes for making harmful chemical substances harmless or less harmful, by effecting a chemical change in the substances
- A62D3/30—Processes for making harmful chemical substances harmless or less harmful, by effecting a chemical change in the substances by reacting with chemical agents
- A62D3/36—Detoxification by using acid or alkaline reagents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
- B09B3/0066—Disposal of asbestos
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/38—Fibrous materials; Whiskers
- C04B14/40—Asbestos
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/009—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone characterised by the material treated
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
- C04B41/50—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials
- C04B41/5018—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials with fluorine compounds
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/60—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone of only artificial stone
- C04B41/61—Coating or impregnation
- C04B41/65—Coating or impregnation with inorganic materials
- C04B41/66—Fluorides, e.g. ocratation
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/60—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone of only artificial stone
- C04B41/61—Coating or impregnation
- C04B41/65—Coating or impregnation with inorganic materials
- C04B41/68—Silicic acid; Silicates
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62D—CHEMICAL MEANS FOR EXTINGUISHING FIRES OR FOR COMBATING OR PROTECTING AGAINST HARMFUL CHEMICAL AGENTS; CHEMICAL MATERIALS FOR USE IN BREATHING APPARATUS
- A62D2101/00—Harmful chemical substances made harmless, or less harmful, by effecting chemical change
- A62D2101/40—Inorganic substances
- A62D2101/41—Inorganic fibres, e.g. asbestos
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- General Health & Medical Sciences (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Environmental & Geological Engineering (AREA)
- Civil Engineering (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
Description
In der deutschen Patentanmeldung P 43 44 478.4 ist ein Verfahren zur chemisch/morphologischen Umwandlung von Asbest beschrieben, das auf der Anwendung von sauren Solen der Kieselsäure bzw. ihren Derivaten beruht. Die dafür erforderlichen Kieselsäuren bzw. ihre Derivate können entsprechend dem Stand der Technik nach zwei Verfahren hergestellt werden, nach dem Hydrosolverfahren bzw. nach dem Alkoxid-Sol-Gel-Verfahren.In German patent application P 43 44 478.4 there is a Process for the chemical / morphological conversion of asbestos described that on the application of acidic sols Silicic acid or its derivatives is based. The one for that required silicas or their derivatives according to the state of the art by two methods are produced by the hydrosol process or Alkoxide-sol-gel process.
Im Falle der Anwendung des Hydrosol-Verfahrens dienen als Imprägnierungsmaterial zur Behandlung von Asbest und Asbest enthaltenden Materialien aus Wasserglaslösungen durch Ionenaustausch hergestellte polymere Kieselsäuren, wobei jedoch die Partikelgrößen dieser polymeren Kieselsäuren im wesentlichen identisch ist mit denen der aus Wasserglas hergestellten Alkalisilicat-Lösungen. Damit ist das Penetrationsvermögen von den nach dem Hydrosol-Verfahren erzeugten polymeren Kieselsäuren ähnlich demjenigen wäßriger Alkalisilicat-Lösungen.In case of application of the hydrosol process serve as impregnation material for the treatment of asbestos and Materials containing asbestos from water glass solutions Polymeric silicas produced by ion exchange, wherein however the particle sizes of these polymeric silicas in is essentially identical to that of water glass Alkali silicate solutions produced. That’s it Penetration ability by the hydrosol process produced polymeric silicas similar to that of aqueous Alkali silicate solutions.
Werden jedoch die zur Behandlung von Asbest und zementgebundenen Asbestfasern vorgesehenen Kieselsäuren und Kieselsäurederivate nach dem Alkoxid-Sol-Gel-Verfahren hergestellt und ist das Wasser/Ester-Verhältnis 4, so resultieren für den Beschichtungsvorgang hier Verbindungen mit nicht so hohen Molmassen und damit mit verbessertem Penetrationsvermögen.However, those used to treat asbestos and cement-bound asbestos fibers provided silicas and Silicic acid derivatives using the alkoxide sol-gel process prepared and the water / ester ratio is 4, so This results in connections for the coating process with not so high molecular weights and thus with improved Penetration ability.
Die vorliegende Erfindung hat die Aufgabe, gegenüber den o.a. Imprägnierungs- bzw. Beschichtungsstoffen solche bereitzustellen, die sich auf Grund ihrer geringen Molmasse und der Kleinheit der Partikel ganz besonders als Mittel mit hervorragenden Penetrationseigenschaften zur Behandlung von Asbestfasern und von asbesthaltigen Massen eignen und sich durch gute Haftfähigkeit auf mineralischen Baustoffen nach Behandlung mit dem Faserbindemittel auszeichnen.The present invention has the task over the o.a. Impregnation or coating materials to provide, due to their low molecular weight and the smallness of the particles especially as a means excellent penetration properties for the treatment of Asbestos fibers and masses containing asbestos are suitable and suitable due to good adhesion to mineral building materials Label treatment with the fiber binder.
Erfindungsgemäß wird die Aufgabe dadurch gelöst, daß zur Herstellung der Kieselsäurederivate auf der Grundlage des Alkoxid-Sol-Gel-Verfahrens mit einem Wasserdefizit bei der Hydrolyse der Siliciumester, deren Derivate und/oder einer Kombination verschiedener Ester und/oder Esterderivate gearbeitet wird, so daß zur Behandlung des Asbests oder der Asbest enthaltenden Materialien mit dem Ziel der chemisch/morphologischen Umwandlung des Asbests keine kolloiddispersen, sondern molekularedisperse Lösungen vorliegen, die dann auf Grund ihrer geringen Molekülgröße in den Asbest und in die Asbest enthaltenden Materialien besser als kolloiddisperse Lösungen einzudringen vermögen. Diese niedermolekularen reaktiven Verbindungen sind in der Lage, bei Einwirkung weiteren Wassers (z. B. Wasserdampf aus der Atmosphäre, Porenflüssigkeit in mineralischen Baustoffen) durch Fortsetzung der Hydrolyse- und Kondensationsreaktionen weiter zu vernetzen und es schließlich zur Gelbildung kommt, so daß auch in diesem Falle letztendlich anorganische Hochpolymere eine effektive Beschichtung und Faserbindung bewirken.According to the invention the object is achieved in that Production of the silica derivatives based on the Alkoxide-sol-gel process with a water deficit in the Hydrolysis of the silicon esters, their derivatives and / or one Combination of different esters and / or ester derivatives is worked so that for the treatment of asbestos or Materials containing asbestos with the aim of chemical / morphological conversion of asbestos none colloidally disperse, but molecularly disperse solutions are present, which are then due to their small molecular size in the asbestos and in the materials containing asbestos better are able to penetrate as colloidally disperse solutions. These low molecular weight reactive compounds are able upon exposure to further water (e.g. water vapor from the Atmosphere, pore fluid in mineral building materials) by continuing the hydrolysis and condensation reactions continue to network and eventually gel formation occurs so that even in this case ultimately inorganic High polymer an effective coating and fiber bonding effect.
Da die penetrierenden anhydrolysierten sauren Kieselsäureester für relativ lange Zeit flüssig bleiben, ist vor dem Eintreten der Vernetzung der Asbestfasern die Möglichkeit gegeben, daß die Magnesiumionen des Chrysotil- Asbests partiell oder vollständig durch Protonen des sauren flüssigen Mediums ersetzt werden und damit die chemische Zusammensetzung und Morphologie der gesundheitsgefährdenden Fasern nachhaltig verändert wird.Because the penetrating hydrolyzed acidic Silica ester remains liquid for a relatively long time before the crosslinking of the asbestos fibers occurs Possibility that the magnesium ions of the chrysotile Asbestos partially or completely by protons of the acidic liquid medium to be replaced and thus the chemical Composition and morphology of health hazardous Fibers is changed sustainably.
Die Reaktivität der erfindungsgemäß verwendeten Kieselsäureester bzw. ihrer Derivate läßt sich durch die Menge des zugesetzten Wassers und/oder die Zahl der Hydrolyseschritte variieren. Bei gleichem Wassergehalt führt eine im sauren Medium durchgeführte Mehrstufenhydrolyse im Vergleich zur Einstufenhydrolyse zu höheren Reaktivitäten.The reactivity of those used in the invention Silicic acid esters or their derivatives can be obtained through the Amount of water added and / or the number of Hydrolysis steps vary. With the same water content leads a multistage hydrolysis carried out in an acid medium Comparison to single-stage hydrolysis for higher reactivities.
Des weiteren ist die Mehrstufenhydrolyse auch in der Weise durchführbar, daß in der ersten Stufe säurekatalysiert anhydrolysiert und in der zweiten Stufe der Prozeß basekatalysiert weitergeführt wird. Dieser zweite Prozeßschritt kann beispielsweise auch durch die basische Porenflüssigkeit, wie sie in der Matrix von Portland-Zement gebundenen mineralischen Baustoffen auftritt, initiiert werden.Furthermore, the multi-stage hydrolysis is also in the Feasible in such a way that acid-catalyzed in the first stage hydrolyzed and in the second stage the process base-catalyzed. This second The process step can also be done, for example, through the basic step Pore fluid as found in the matrix of Portland cement bound mineral building materials occurs will.
Der Feststoffgehalt bei dem erfindungsgemäßen Imprägnier- und Beschichtungsmittel liegt im Bereich zwischen 5 und 25 Gew.-%, so daß sich dadurch ein vergleichsweise niedriger Gehalt an Lösungsmittel ergibt. Werden derart hochhonzentrierte Lösungen verwendet, dann haben diese Mittel immer noch und im Unterschied zu organischen Beschichtungsmittel eine wasserähnliche Konsistenz.The solids content in the impregnation and Coating agent is in the range between 5 and 25% by weight, so that this results in a comparatively low salary of solvent. Are so highly concentrated Solutions used, then these funds are still and im Difference to organic coating agents water-like consistency.
Die Erfindung wird nachfolgend an Beispielen erläutert, ohne sie damit einzuschränken.The invention is explained below using examples, without to limit them.
Man bereite bei 20°C eine Lösung aus Tetraethoxysilan (TEOS), Ethanol, Wasser und Salzsäure im molaren Verhältnis TEOS : C₂H₅OH : H₂O : HCl = 1 : 6 : 4 : 0.001, indem man TEOS und Ethanol vorlegt und das Wasser mit dem Katalysator (HCl) als entsprechend verdünnte Salzsäure zugibt. Der pH-Wert der Lösung ist etwa 2. Die Lösung ist bei Lagerung in einem geschlossenen Gefäß bei Raumtemperatur mindestens drei Monate anwendungsbereit.Prepare a solution of tetraethoxysilane at 20 ° C (TEOS), ethanol, water and hydrochloric acid in a molar ratio TEOS: C₂H₅OH: H₂O: HCl = 1: 6: 4: 0.001 by making TEOS and ethanol and the water with the catalyst (HCl) as appropriately diluted hydrochloric acid. The pH of the Solution is about 2. The solution is when stored in one closed vessel at room temperature for at least three months ready to use.
Man bereite bei 20°C eine Lösung aus TEOS, Ethanol, Wasser und HCl im molaren Verhältnis 1 : 4.5 : 1 : 0.01 durch Mischen der Komponenten. Die Lösung ist in einem geschlossenen Gefäß bei Raumtemperatur mindestens 1 1/2 Jahre haltbar.Prepare a solution of TEOS, ethanol, water at 20 ° C and HCl in a molar ratio of 1: 4.5: 1: 0.01 Mixing the components. The solution is in one closed vessel at room temperature for at least 1 1/2 years durable.
Man bereite bei 20°C eine Lösung aus TEOS, Ethanol, Wasser und HCl im molaren Verhältnis 1 : 4.5 : 1 : 0.01 durch Mischen der Komponenten. Anschließend wird die Lösung unter Rückfluß drei Stunden gekocht. Sie ist in einem verschlossenen Gefäß bei Raumtemperatur mindestens ein Jahr haltbar.Prepare a solution of TEOS, ethanol, water at 20 ° C and HCl in a molar ratio of 1: 4.5: 1: 0.01 Mixing the components. Then the solution is under Reflux cooked for three hours. It is in one sealed container at room temperature for at least one year durable.
Man bereite bei 20°C eine Lösung aus TEOS, Ethanol, Wasser und HCl im molaren Verhältnis 1 : 2 : 1 : 0.05, indem man TEOS in Ethanol vorlegt und das H₂O-HCl-Gemisch zufügt. Die Lösung wird bei 78°C drei Stunden unter Rückfluß gekocht und anschließend mit 0.7 Mol H₂O pro Mol TEOS der Ausgangsmischung versetzt. Die Lösung ist verschlossen bei Raumtemperatur mindestens ein Jahr haltbar.Prepare a solution of TEOS, ethanol, water at 20 ° C and HCl in a molar ratio of 1: 2: 1: 0.05 by Submit TEOS in ethanol and add the H₂O-HCl mixture. The Solution is refluxed at 78 ° C for three hours and then with 0.7 moles of H₂O per mole of TEOS Starting mixture added. The solution is closed at Room temperature can be kept for at least one year.
20 g Chrysotil-Asbest werden in dem nach Beispiel 1 hergestellten Kieselsol eine Stunde bei Raumtemperatur gelagert. Die Asbestfasern werden anschließend aus der Lösung herausgenommen und 14 Tage an der Luft getrocknet. Es entsteht eine verklebte feste Masse.20 g of chrysotile asbestos are in the according to Example 1 produced silica sol for one hour at room temperature stored. The asbestos fibers are then released from the solution removed and air dried for 14 days. It creates a bonded solid mass.
Nach EDX-Analysen beträgt das molare Mg/Si-Verhältnis im
Faserbereich etwa 0.1, was entweder auf eine starke SiO₂-
Beschichtung oder/und eine Mg-Substitution durch Protonen
schließen läßt. Die Zwischenfaserbereiche werden als 100%
SiO₂ identifiziert (Für diese Analysen wurden die Proben
zusätzlich bei 110°C eine Stunde getrocknet.).According to EDX analyzes, the molar Mg / Si ratio in the fiber area is about 0.1, which is either due to a strong SiO₂-
Coating or / and Mg substitution by protons can be concluded. The intermediate fiber areas are identified as 100% SiO₂ (For these analyzes, the samples were additionally dried at 110 ° C for one hour.).
Claims (8)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4426711A DE4426711A1 (en) | 1993-12-21 | 1994-07-20 | Chemical and morphological transformation of asbestos material |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4344478A DE4344478A1 (en) | 1993-12-21 | 1993-12-21 | Chemical and morphological alteration of asbestos, useful as precursor |
| DE4426711A DE4426711A1 (en) | 1993-12-21 | 1994-07-20 | Chemical and morphological transformation of asbestos material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE4426711A1 true DE4426711A1 (en) | 1996-01-25 |
Family
ID=25932520
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE4426711A Withdrawn DE4426711A1 (en) | 1993-12-21 | 1994-07-20 | Chemical and morphological transformation of asbestos material |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE4426711A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2755138A1 (en) * | 1996-10-24 | 1998-04-30 | Truyol Albert | PROCESS FOR THE PREPARATION OF A HYBRID SOL USABLE FOR INACTIVATION OF ASBESTOS |
| FR2755684A1 (en) * | 1996-11-14 | 1998-05-15 | Univ Lille Sciences Tech | PROCESS FOR TREATING MINERAL FIBROUS MATERIALS WITH TOXIC RISKS |
| EP0853959A1 (en) * | 1997-01-20 | 1998-07-22 | Inertec | Composition for treating asbestos |
-
1994
- 1994-07-20 DE DE4426711A patent/DE4426711A1/en not_active Withdrawn
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2755138A1 (en) * | 1996-10-24 | 1998-04-30 | Truyol Albert | PROCESS FOR THE PREPARATION OF A HYBRID SOL USABLE FOR INACTIVATION OF ASBESTOS |
| WO1998017709A1 (en) * | 1996-10-24 | 1998-04-30 | Albert Truyol | Method for preparing a hybrid sol to be used for the inactivation of asbestos |
| FR2755684A1 (en) * | 1996-11-14 | 1998-05-15 | Univ Lille Sciences Tech | PROCESS FOR TREATING MINERAL FIBROUS MATERIALS WITH TOXIC RISKS |
| WO1998021155A1 (en) * | 1996-11-14 | 1998-05-22 | Universite Des Sciences Et De Technologies De Lille | Method for treating fibrous mineral materials with toxic risks |
| EP0853959A1 (en) * | 1997-01-20 | 1998-07-22 | Inertec | Composition for treating asbestos |
| FR2758465A1 (en) * | 1997-01-20 | 1998-07-24 | Inertec | COMPOSITION FOR TREATING ASBESTOS |
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