WO1990015642A1 - Procede et produits ameliores de traitement d'amiante - Google Patents

Procede et produits ameliores de traitement d'amiante Download PDF

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Publication number
WO1990015642A1
WO1990015642A1 PCT/US1990/003333 US9003333W WO9015642A1 WO 1990015642 A1 WO1990015642 A1 WO 1990015642A1 US 9003333 W US9003333 W US 9003333W WO 9015642 A1 WO9015642 A1 WO 9015642A1
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WO
WIPO (PCT)
Prior art keywords
asbestos
solution
acid
weight
weak
Prior art date
Application number
PCT/US1990/003333
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English (en)
Inventor
William Mirrick
Walter B. Forrister
Original Assignee
Tony Nocito Inc.
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
Priority claimed from US07/366,589 external-priority patent/US5041277A/en
Application filed by Tony Nocito Inc. filed Critical Tony Nocito Inc.
Priority to CA002060500A priority Critical patent/CA2060500C/fr
Priority to DE69031657T priority patent/DE69031657T2/de
Publication of WO1990015642A1 publication Critical patent/WO1990015642A1/fr

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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
    • A62D3/35—Processes for making harmful chemical substances harmless or less harmful, by effecting a chemical change in the substances by reacting with chemical agents by hydrolysis
    • 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

Definitions

  • the invention relates to a method for treating asbestos so as to render it harmless, and to a solution effective for use in such treatment.
  • the other varieties of asbestos are silicates of magnesium, iron, calcium, and sodium. These varieties of asbestos belong to the amphibole (straight fiber) group of minerals. About 95% of world production is the chrysotile form of asbestos.
  • the reaction that is believed to initiate fibrosis should be blocked and biological hazards associated with exposure of living organisms to asbestos should be reduced. Accordingly, it is an object of the present invention to provide a process for rendering asbestos harmless by destroying its crystalline structure and fibrous nature.
  • weak acid is used herein in its generally understood sense, i.e., an acid is defined as being “weak” if its protolysis reaction with water does not go essentially to completion unless the solution is extremely dilute.
  • the method may be used .in situ by spraying asbestos- containing materials which are in place, for instance, in a building, with the weak acid solution.
  • the weak acid solution Depending on what acid is used, one is able to achieve 90% and preferably greater conversion of the asbestos such that what remains is a non-asbestos material which, however, retains fire retardant properties.
  • 90% or more of asbestos is converted in accordance with the method of the present invention, the remaining material no longer has the characteristic asbestos fibrous nature and so is essentially no longer asbestos.
  • the asbestos-containing materials preferably receive more than one, e.g., two to six or more, spray applications of an aqueous solution of a weak organic acid, such as trifluoroacetic acid, to achieve a 98% or more conversion of the asbestos.
  • a weak organic acid such as trifluoroacetic acid
  • the converted material can be left in place and still retain good insulating and fire retardant properties.
  • a stabilizing agent which may preferably comprise a resin in combination with a sodium silicate material, is applied to the converted material.
  • the stabilizing agent binds the converted material together and to the substrate and prevents them from becoming airborne.
  • the asbestos-containing materials are sprayed in situ with an aqueous solution containing a weak acid and a source of fluoride ions, such as ammonium fluoride (NH4F) or sodium fluoride (NaF) .
  • the aqueous solution should comprise about 1-25%, preferably about 5-15%, by weight of a weak organic acid, and about 1-10%, preferably about 2-8%, by weight of the fluoride ion source.
  • the concentration of the acid in the solution should be higher than that of the fluoride ion source such that their molar ratio is maintained at greater than one during use.
  • a solution containing both a dilute weak acid and a source of fluoride ions attacks asbestos in two ways.
  • the acid attacks the MgO layers in the crystal structure of chrysotile asbestos.
  • the fluoride ions attack the silica layers, converting them into fluorosilicate.- Adding fluoride ions to the treatment solution greatly speeds up the rate of conversion of asbestos. It is believed that the fluoride ion increases the rate at which the weak acid diffuses into the magnesia layers. It also makes the solution much more effective in converting forms of asbestos other than chrysotile, such as amosite, which are not attacked very strongly by the weak acid solution alone.
  • the solution of the invention useful for converting asbestos to a non-crystalline material comprises an aqueous solution of between about 1-25%, preferably about 5-15%, by weight of a weak organic acid and about 1-10%, preferably about 2-8% by weight of a fluoride ion source.
  • FIGs 1-3 are photomicrographs of untreated chrysotile asbestos fibers at magnifications of 1000X, 500OX, and 10,00OX respectively.
  • FIGs 4-6 are photomicrographs of chrysotile asbestos after treatment in accordance with the process of the present invention at magnifications of 1000X, 5000X, and 10,000X respectively.
  • the present invention is primarily intended for the conversion of the chrysotile form of asbestos to a non-asbestos material, it is also effective. particularly when a source of fluoride ions is included, for the conversion of other forms of asbestos, such as amosite.
  • untreated chrysotile asbestos is shown at magnifications ranging from 1000X to 10,000X.
  • the serpentine fibers characteristic of chrysotile asbestos are clearly evident in these photomicrographs. The harmful effects of these fibers is well documented at this time.
  • asbestos such as is shown in FIGs 1-3 is treated, for example by spraying or immersion, with a dilute aqueous solution of a weak acid having a concentration of about 1 to 25%, and preferably 5 to 15%, by weight of the weak acid.
  • the solution also contains about 1 to 10%, most preferably about 2 to 8%, by weight of a source of fluoride ions.
  • concentrations of weak acid and fluoride ion source may be used but increase expense and materials handling problems, without having been found to provide significant increased benefits.
  • the concentrations of the fluoride ion source is further limited by its solubility.
  • the weak acid is a weak organic acid having a pH in the range of about 2 to 6.
  • acetic acid p-cyanobenzoic acid
  • trifluoroacetic acid lactic acid, benzoic acid
  • lactic acid benzoic acid
  • formic acid trifluoroacetic acid
  • trifluoroacetic acid is substantially slower acting than the others, so that it is less preferred.
  • Weak acids having lower pH's are normally preferred over ones having higher pH's.
  • any water soluble weak acid may be used, particularly any organic weak acid. The reaction rates and other characteristics of particular acids may make them undesirable, however.
  • Dilute solutions of organic weak acids are preferred because, in accordance with the invention, they have been found to wet the asbestos-containing materials extremely well, and obviate the need for any separate wetting agent.
  • All forms of asbestos are crystalline minerals.
  • the conversion process of the invention converts the asbestos to a noncrystalline material, such as a glass, or at least to a material which no longer has more than trace amounts of asbestos crystallinity when measured by currently accepted methods, such as polarizing light microscopy, TEM or X-ray diffraction.
  • all traces of asbestos crystallinity are destroyed by the process of the invention.
  • reductions in crystallinity are referred to herein, it is referring to the reduction or substantial elimination of asbestos crystallinity.
  • the process of the invention is referred to as converting the asbestos- containing material to a non-fibrous material, it refers to the elimination of asbestos fibers.
  • Other types of fibers, such as fine glass fibers may remain, particularly if the process is performed completely in situ.
  • FIGs 4-6 show chrysotile asbestos at magnifications ranging from 1000X to 10,000X after being immersed in a 5% aqueous solution of trifluoroacetic acid in accordance with the method of the present invention.
  • FIGs 4-6 show the dramatic differences resulting from treatment of chrysotile asbestos with a dilute weak acid solution in accordance with the method of the present invention.
  • the fibrous nature of asbestos is destroyed and only non-fibrous silica particles remain.
  • the weak acid that is chosen and its concentration it is possible to achieve more than 90% reduction of the crystallinity of asbestos by means of the present invention.
  • All that is necessary is to wet the chrysotile fibers with the weak acid solution, for instance, either by spraying or immersing the asbestos material with or in the solution.
  • asbestos-containing building materials such as fireproofing materials on girders and decking, this can be done in situ by spraying the weak acid solution directly onto the asbestos-containing materials.
  • an anionic surfactant such as sodium dodecyl sulfate or a non-ionic surfactant such as Surfynol 465, a product sold by the Air Products Company
  • an anionic surfactant such as sodium dodecyl sulfate or a non-ionic surfactant such as Surfynol 465, a product sold by the Air Products Company
  • the asbestos-containing material is to be removed from the building component or other- substrate to which it is applied, or if loose asbestos-containing material is to be treated in accordance with the invention, it is frequently preferable to immerse the asbestos-containing material in the weak acid solution to insure complete wetting.
  • the solution is preferably agitated, for instance with the use of a propeller-type mixer such as is commonly used in industrial settings, which significantly speeds the conversion of the asbestos.
  • the conversion can be further speeded, if desired, by heating the solution. Heating the solution usually has less effect on the conversion rate in spraying operations because the mass and thermal inertia of the material being treated is normally much greater than that of the solution being applied.
  • the conversions shown in Table 1 take place in periods ranging from 2 days to 4 weeks. In large measure, these long periods of time are required by the slow nature of the reaction, particularly the slow rate at which the weak acids diffuse through the silica layers. Some acids, such as trifluoroacetic acid, react much faster than others and are preferred. In some cases, the slow reaction is due to the difficulty in actually wetting the asbestos fibers contained therein. For example, it is much easier to wet the exposed asbestos fibers in pipe insulation than it is to wet asbestos fibers which are tightly bound to a binder such as, for example, transite board or floor tile. In order to ensure that as much conversion as possible takes place in in situ conversion treatments, the asbestos fibers are preferably subjected to successive sprayings with the weak acid solution.
  • the materials can be wet a second and successive times, preferably with about 12 to 24 hours between each application, until the destruction of the asbestos fibers is achieved.
  • the number of wettings or sprayings required for complete destruction of the asbestos fiber depends on a variety of factors, such as the amount and porosity of the binder with which the asbestos fibers are mixed, the particular weak acid employed, whether a fluoride ion source is included in the solution, and the type of asbestos fibers being treated. It has been found, in accordance with the invention, that the effectiveness of the individual sprayings is substantially increased if the material being treated is permitted to dry between each successive spray application. It is believed that the reason for this is that degradation products produced by the reaction become hydrated and impede transport of fresh treatment solution to the asbestos fibers during subsequent applications. Drying the asbestos-containing material between applications obviates this problem.
  • the resulting non-fibrous material may be left in place to perform the fireproofing or other function for which the asbestos was originally installed provided it has retained its physical integrity and adheres adequately to the underlying substrate.
  • the resulting material is preferably sprayed or washed with a mild alkaline solution, such as of sodium bicarbonate, in order to neutralize any remaining acid in the material.
  • the material is fully neutralized when the pH of a sample placed in water is at 7.
  • the material may be stabilized by applying a stabilizing or fixing agent to the material to bind it together.
  • the stabilizing agent should contain a resin-like material, such as a latex resin, as a binder.
  • the stabilizing agent also contains a sodium silicate material which helps to bind and harden the material.
  • the stabilizing agent may also include an alkaline neutralizing material, in which case the neutralizing and stabilizing steps may be combined, so that the need for a separate neutralizing step is obviated.
  • One suitable stabilizing agent comprises about 25% by volume N-sodium silicate, 25% by volume acrylic latex (Rohm and Haas) , 5% by volume latex (BF Goodrich) , 10% by volume alkaline cleaner (Du Bois) , 5% by volume water softener (Calgon) , 5% by volume wetting and dispersing additive (Byk) , and 25% by volume water.
  • Other stabilizing agents may include styrene-butadiene or polyvinyl chloride resins. Such resins may be used with or without sodium silicate.
  • Yet another stabilizing agent includes a urethane resin and no sodium silicate. The stabilizing agent is applied, preferably by spraying, after the asbestos-containing material has been treated sufficiently to effectively destroy the fibrous asbestos.
  • the stabilizing agent typically requires about 4 to 8 hours to cure, depending on the atmospheric humidity. If necessary, for additional fire-retardant characteristics, a layer of non-asbestos-containing fireproofing material can be sprayed over the stabilized material.
  • the addition of a source of fluoride ions to the treatment solution both dramatically speeds the rate of conversion of the asbestos to a non-fibrous material and makes the process of the invention effective for the conversion of other types of asbestos, such as amosite, to a non-fibrous material.
  • the treatment solution of the invention converts the asbestos to a noncrystalline product by the fluoride ions attacking the silica content of the asbestos. To do this it is necessary that the fluoride ions be in an acid environment.
  • Suitable fluoride ion sources include, for example, ammonium fluoride (NH4F) , alkali metal fluorides (LiF, NaF, KF, CsF) , and hydrofluoric acid (HF) and mixtures of the above.
  • the fluoride ion especially in weak acid solution, is believed to attack the silica layers and greatly enhances the rate at which the weak acid attacks the MgO units in chrysotile asbestos.
  • An HF solution may be used alone both as the acid and the fluoride ion source but extreme care must be exercised in handling it and it is not preferred.
  • An important advantage of the preferred treatment solutions of the invention is that they can be handled with only reasonable precautions.
  • the asbestos-containing material is removed from the substrate to which it has been applied, preferably while still wet from one or more initial spray applications of the treatment solution of the invention, and digested by immersion in the solution,' preferably with heat and agitation, until the asbestos is destroyed.
  • the process of the invention may typically include the steps of removing any obstructions, such as interior partitions, ceilings and column covers to expose the suspected asbestos-containing materials, sampling and testing the suspected asbestos-containing materials in accordance with applicable standards to determine its composition and other relevant characteristics, determining an optimum formulation for a treatment solution depending on such composition and characteristics, including the need for a separate wetting agent and suitable types and concentrations of weak acids and fluoride ion sources, providing a sufficient amount of such treatment solution, repeatedly spraying the asbestos-containing material .
  • any obstructions such as interior partitions, ceilings and column covers
  • the surfaces that were coated with such asbestos-containing material are refireproofed by either neutralizing and stabilizing the converted material jln situ, or by applying a non- asbestos-containing fireproofing material on such surfaces from which the asbestos has been removed.
  • a final light spray application or misting of the treatment solution to the surfaces is desirable to convert any remaining asbestos fibers which have been missed by the removal process.
  • the surface be dry before the misting.
  • the surfaces are also preferably neutralized by spraying with mild alkaline solutions.
  • an additional layer of fireproofing material can be applied over the stabilized material.
  • the asbestos abatement process may also be carried out by spraying the asbestos-containing material one or more times with the treatment solution, removing the asbestos-containing material while still wet and disposing of it in a conventional manner.
  • the underlying substrate can then be misted with the treatment solution (after drying, if desired) , neutralized, and then refireproofed as described above.
  • the particular composition of the solution used for the various spray applications, or for an initial spray application and immersion may be varied if desired, but are referred to herein collectively as a singular solution. For instance, the concentration of the solution used for the digestion step might preferably be higher than that used for the spray application steps for safety reasons.
  • this dust may be dealt with easily and much less expensively by spraying it in situ with the solution of the invention, repeatedly if necessary, in order to convert any asbestos in the dust to a non-fibrous, non-hazardous material. Thereafter the dust may be collected and removed by inexpensive, conventional means, since it no longer contains asbestos.
  • the initial generation of the dust during the removal of asbestos-containing material from the underlying substrate is preferably minimized in accordance with the invention by wetting the material with the treatment solution of the invention before removal and by keeping such material wet with such solution while it is removed from the substrate.
  • the asbestos-containing materials are collected and digested by immersion in a vat containing the treatment solution preferably with stirring or agitation, it is also often desirable to grind up the asbestos-containing material either before or during immersion. This is particularly in the case when the asbestos-containing material is non-porous and not attacked by the treatment solution. Typical examples of such materials are transite board or pipe and asbestos-containing tiles. In such situations it is necessary to grind up the material to enable the treatment solution to contact the asbestos fibers. In accordance with the invention, this .grinding is preferably performed while the material is immersed in or being wet down by the treatment solution in order to prevent the generation of asbestos-containing dust.
  • a substantial portion of the material dissolves in the treatment solution, thus reducing the volume of material to be disposed of in a landfill site.
  • a dilute solution of a strong acid rather than a weak acid for digesting the asbestos- containing material after it has been sprayed in situ with the weak acid solution and removed from the substrate.
  • suitable acids include hydrochloric, * hydrofluoric, sulfuric and nitric acids. In all cases except hydrofluoric acid it is preferred to include a fluoride ion source in the solution for the purposes described above.
  • the strong acids have the advantage of being faster acting, but have the disadvantage of requiring much more careful handling and a higher potential for causing serious injury or damage if they are mishandled.
  • the solution be neutralized and the fluoride ions be tied up in compounds having low solubility in water.
  • One way of dealing with the fluoride ions is to merely add sand to the used solution to exhaust the fluoride ions and form fluorosilicates upon neutralization having low solubility in water.
  • Neutralization can be accomplished by adding any alkaline species to the used solution. For instance, sodium hydroxide, sodium bicarbonate or calcium hydroxide could be used, with calcium hydroxide having the advantage that it will tend to form calcium fluoride with any remaining fluoride ions, that is very insoluble in water.
  • the treatment solution in some situations it is desirable for the treatment solution to contain about 20 to 50% by weight of ethanol in order to increase the rate of evaporation. It should be kept in mind, however, that a treatment solution containing fluoride ion should not be allowed to come into contact with any glass surfaces which would be etched by the fluoride ions.
  • Example 1 A 5% by weight aqueous solution of trifluoroacetic acid was applied to various different kinds of chrysotile-containing building materials. Different asbestos-containing materials required different reaction times depending on factors such as binder, asbestos fiber length, asbestos fiber content and other fibers present. When thermal insulation, such as used for insulating pipe runs and boilers, was washed a first time with the acid solution, allowed to penetrate for 24 hours, and then washed a second time with the solution, a reduction in crystallinity of 98% or greater was achieved in periods ranging from 2 to 4 days.
  • Example 2 A 5% by weight aqueous solution of trifluoroacetic acid was applied to various different kinds of chrysotile-containing building materials. Different asbestos-containing materials required different reaction times depending on factors such as binder, asbestos fiber length, asbestos fiber content and other fibers present. When thermal insulation, such as used for insulating pipe runs and boilers, was washed a first time with the acid solution, allowed to penetrate for 24 hours, and then washe
  • Example 3 A 5% solution of lactic acid was used to wash chrysotile asbestos-containing thermal insulation. Six successive washings spaced from one another by approximately 24 hours resulted in a 95% reduction of the chrysotile crystalline structure.
  • Chrysotile asbestos was removed from an asbestos rock with tweezers, resulting in fiber bundles of various sizes ranging in size up to a few mils in diameter.
  • 0.5 grams of the asbestos fiber bundles was soaked in a solution of 2.5 g of trifluoroacetic acid in 47.5 g water for about 48 hours without agitation.
  • a small sample was collected and examined by X-ray analysis and showed a reduction of about 75% in crystallinity. Further examination of the remaining soaking material over the following 2 weeks showed little further reduction.
  • Example 7 1.437g of the chrysotile/mineral wool sample of Example 6 was stirred magnetically in 90 ml of an aqueous solution of ten volume percent trifluoroacetic acid and five * weight percent ammonium fluoride. The temperature was raised to 55-60°C and maintained. After one hour, most of the material had visibly dissolved. A portion was removed and the insoluble matter collected on a 0.2 micron filter. TEM analysis of this residue revealed very few remaining fibers (estimated at less than one percent) , most of the material being in the form of particulate matter.
  • Example 9 0.365g of the chrysotile/mineral wool sample was magnetically stirred in 20ml of the solution used in Example 7; no heat was applied. The bulk of the material had obviously dissolved after one hour, but the reaction was continued for three hours. A small amount of solid residue was collected on a 0.2 micron filter; TEM analysis showed no fibers remaining.
  • 0.265g of the chrysotile/mineral wool sample was magnetically stirred in an aqueous solution of ten volume percent formic acid (a weaker acid than trifluoroacetic) and five weight percent ammonium fluoride. Stirring at room temperature was continued for three hours, at which time undissolved material was collected on a 0.2 micron filter. TEM analysis of the residue showed a low percentage of fibers which appeared under TEM examination not to be asbestos remaining (estimated at ca. 1-2%) .
  • Example 13 0.300g of a sample of pure long fiber amosite asbestos was stirred at room temperature for 15 hours in 20ml of the solution used in Example 7. Most of the material was dissolved; the small amount of remaining insoluble material was not fibrous in nature.
  • chrysotile/mineral wool sample was situated on the raised area of a plastic 4 ounce specimen cup such that any drainage could be removed.
  • the sample was treated dropwise with 3.6 ml of the solution used in Example 7 over a period of three minutes. Approximately 1.5 ml of drainage was removed. The sample was then allowed to dry at ambient temperature. The treatment cycle was then repeated as described a total of ten times, with a minimum of 12 hours between treatments. Since the total amount of residue declined during the treatments, the amount of solution added per cycle was gradually lowered to a final value of 2.0 ml.
  • the TEM micrographs show that the appearance of the treated fibers differs from untreated fibers, although many of the fibers continued to exhibit chrysotile asbestos SAED patterns. After six treatments, the appearance of the fibers is significantly altered. None of the fibers exhibited SAED patterns. Further treatments continued to lower the total residue remaining, but some fibrous material was still present at ten treatments.

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  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Processing Of Solid Wastes (AREA)
  • Fire-Extinguishing Compositions (AREA)
  • Chemical Or Physical Treatment Of Fibers (AREA)

Abstract

Selon un procédé utile pour rendre inoffensive la serpentine fibreuse, on humidifie les fibres d'amiante avec une solution aqueuse contenant entre 1 et 25 % en poids d'un faible acide organique, tel que l'acide trifluoroacétique. Facultativement, la solution aqueuse contient en outre entre 1 et 10 % en poids d'une source d'ions fluorure, telle que le fluorure d'ammonium. La faible solution acide hydrolyse les unités d'oxyde de magnésium dans l'amiante alors que les ions de fluorure attaquent les couches intercalées de silice dans la structure cristalline de l'amiante, détruisant la nature fibreuse de l'amiante.
PCT/US1990/003333 1989-06-15 1990-06-13 Procede et produits ameliores de traitement d'amiante WO1990015642A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CA002060500A CA2060500C (fr) 1989-06-15 1990-06-13 Methode et produits pour le traitement de l'amiante
DE69031657T DE69031657T2 (de) 1989-06-15 1990-06-13 Verfahren und erzeugnisse für die asbestbehandlung

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US366,589 1989-06-15
US07/366,589 US5041277A (en) 1989-06-15 1989-06-15 Method for treating asbestos
US50957190A 1990-04-13 1990-04-13
US509,571 1990-04-13

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WO1990015642A1 true WO1990015642A1 (fr) 1990-12-27

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CA (1) CA2060500C (fr)
DE (1) DE69031657T2 (fr)
WO (1) WO1990015642A1 (fr)

Cited By (4)

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EP0546984A1 (fr) * 1991-12-04 1993-06-16 SOLVAY UMWELTCHEMIE GmbH Décomposition semi-continue d'amiante
EP2946813A1 (fr) * 2014-05-21 2015-11-25 Euro Environmental Services Ltd Procédé et composition de solutions pour l'élimination sélective de l'amiante dans des produits à base de ciment et d'amiante et détoxification totale de produits de décomposition
US9283417B2 (en) 2013-11-27 2016-03-15 Korea Institute Of Geoscience And Mineral Resources Method of detoxifying asbestos by using room-temperature recrystallization scheme
CN113443869A (zh) * 2021-04-01 2021-09-28 罗安锰 一种石棉水泥及其生产工艺

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JP2008296117A (ja) * 2007-05-30 2008-12-11 Sumitomo Osaka Cement Co Ltd アスベストの無害化処理方法及びアスベストの無害化処理水溶液
JP5234903B2 (ja) * 2007-11-02 2013-07-10 一般財団法人ファインセラミックスセンター アスベスト含有材料の処理方法
JP2010185182A (ja) * 2009-02-10 2010-08-26 Shimizu Corp アスベスト含有吹付け材の除去方法
WO2010110477A1 (fr) * 2009-03-27 2010-09-30 嘉納 輝明 Agent dissolvant l'amiante et procédé de traitement humide pour la détoxification de l'amiante
JP5263538B2 (ja) * 2009-07-28 2013-08-14 直 岩附 アスベスト溶解剤およびアスベスト無害化湿式処理方法
JP2011196169A (ja) * 2010-02-24 2011-10-06 Shimizu Corp アスベスト含有材の除去方法
KR101184037B1 (ko) 2012-08-08 2012-09-18 주식회사 삼신기업 고침투형 석면 안정화제 및 이를 이용한 석면 안정화공법
EP2772284B1 (fr) 2013-02-26 2018-07-04 Korea Institute Of Geoscience & Mineral Resources Procédé d'élimination d'amiante à partir de matériaux contenant de l'amiante à 99% par un traitement thermique à basse température
KR101326741B1 (ko) 2013-06-25 2013-11-08 한국지질자원연구원 폐슬레이트의 석면 무해화 처리 방법, 및 이렇게 하여 얻은 무해화된 석면
KR20160147951A (ko) * 2014-04-29 2016-12-23 레브스 에스.알.엘. 석면-함유 물질의 생화학적 변성방법

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Title
CHEMICAL ABSTRACTS, Vol. 105, No. 6, 11 August 1986, (Columbus, Ohio, US), L. HEASMAN et al.: "The Destruction of Chrysotile Asbestos using Waste Acids", see page 347* Abstract 48387v, & Waste Manage. Res. 1986, 4(2), 215-23* *
CHEMICAL ABSTRACTS, Vol. 109, No. 20, 14 November 1988, (Columbus, Ohio, US), G. BALDWIN et al.: "An Environmentally Acceptable Treatment Method for Chrysotile Asbestos Wastes", see page 335* Abstract 175675v, & Chem. Environ., Proc. Int.Conf. 1986, 36-46* *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0546984A1 (fr) * 1991-12-04 1993-06-16 SOLVAY UMWELTCHEMIE GmbH Décomposition semi-continue d'amiante
US9283417B2 (en) 2013-11-27 2016-03-15 Korea Institute Of Geoscience And Mineral Resources Method of detoxifying asbestos by using room-temperature recrystallization scheme
EP2946813A1 (fr) * 2014-05-21 2015-11-25 Euro Environmental Services Ltd Procédé et composition de solutions pour l'élimination sélective de l'amiante dans des produits à base de ciment et d'amiante et détoxification totale de produits de décomposition
CN113443869A (zh) * 2021-04-01 2021-09-28 罗安锰 一种石棉水泥及其生产工艺

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CA2060500A1 (fr) 1991-10-14
DE69031657D1 (de) 1997-12-04
CA2060500C (fr) 2001-02-13
JP3066976B2 (ja) 2000-07-17
JPH04506165A (ja) 1992-10-29
DE69031657T2 (de) 1998-06-10

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