DE4239565A1 - Easy setting cement mixt. - contg. decontaminated asbestos cement which is opt. neutralised and is free from water - Google Patents
Easy setting cement mixt. - contg. decontaminated asbestos cement which is opt. neutralised and is free from waterInfo
- Publication number
- DE4239565A1 DE4239565A1 DE4239565A DE4239565A DE4239565A1 DE 4239565 A1 DE4239565 A1 DE 4239565A1 DE 4239565 A DE4239565 A DE 4239565A DE 4239565 A DE4239565 A DE 4239565A DE 4239565 A1 DE4239565 A1 DE 4239565A1
- Authority
- DE
- Germany
- Prior art keywords
- cement
- decontaminated
- asbestos cement
- fluorine
- asbestos
- 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- Withdrawn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
- 239000004568 cement Substances 0.000 title claims abstract description 51
- 239000010425 asbestos Substances 0.000 title claims abstract description 36
- 229910052895 riebeckite Inorganic materials 0.000 title claims abstract description 36
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 7
- 150000007522 mineralic acids Chemical class 0.000 claims abstract description 14
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 9
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 9
- 239000004571 lime Substances 0.000 claims abstract description 9
- 239000002253 acid Substances 0.000 claims abstract description 6
- 238000002156 mixing Methods 0.000 claims abstract description 3
- 150000003839 salts Chemical class 0.000 claims abstract description 3
- 239000002994 raw material Substances 0.000 claims description 26
- 239000000203 mixture Substances 0.000 claims description 22
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims description 13
- 229910052731 fluorine Inorganic materials 0.000 claims description 13
- 239000011737 fluorine Substances 0.000 claims description 13
- 239000007864 aqueous solution Substances 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 8
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims description 7
- 150000008043 acidic salts Chemical class 0.000 claims description 5
- 239000003795 chemical substances by application Substances 0.000 claims description 5
- -1 hexafluoro silica acid Chemical compound 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 238000010304 firing Methods 0.000 claims description 3
- 239000008267 milk Substances 0.000 claims description 3
- 210000004080 milk Anatomy 0.000 claims description 3
- 235000013336 milk Nutrition 0.000 claims description 3
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 2
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 2
- 239000000654 additive Substances 0.000 claims description 2
- 230000000996 additive effect Effects 0.000 claims description 2
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 2
- 230000003472 neutralizing effect Effects 0.000 claims 1
- 238000002360 preparation method Methods 0.000 claims 1
- 239000000932 sedative agent Substances 0.000 claims 1
- 230000001624 sedative effect Effects 0.000 claims 1
- 239000004575 stone Substances 0.000 claims 1
- 239000004927 clay Substances 0.000 abstract description 7
- 239000000463 material Substances 0.000 abstract description 4
- 235000019738 Limestone Nutrition 0.000 abstract description 3
- 239000006028 limestone Substances 0.000 abstract description 3
- 238000010276 construction Methods 0.000 abstract description 2
- 239000004615 ingredient Substances 0.000 abstract 2
- 239000000835 fiber Substances 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 2
- 150000007513 acids Chemical class 0.000 description 2
- 239000007884 disintegrant Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 229910052708 sodium Inorganic materials 0.000 description 2
- ASZZHBXPMOVHCU-UHFFFAOYSA-N 3,9-diazaspiro[5.5]undecane-2,4-dione Chemical compound C1C(=O)NC(=O)CC11CCNCC1 ASZZHBXPMOVHCU-UHFFFAOYSA-N 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- LDDQLRUQCUTJBB-UHFFFAOYSA-O azanium;hydrofluoride Chemical compound [NH4+].F LDDQLRUQCUTJBB-UHFFFAOYSA-O 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 1
- 229910001634 calcium fluoride Inorganic materials 0.000 description 1
- 235000011116 calcium hydroxide Nutrition 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910000040 hydrogen fluoride Inorganic materials 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 159000000001 potassium salts Chemical class 0.000 description 1
- 239000011541 reaction mixture Substances 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 239000002699 waste material Substances 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
- C04B7/00—Hydraulic cements
- C04B7/24—Cements from oil shales, residues or waste other than slag
- C04B7/246—Cements from oil shales, residues or waste other than slag from waste building materials, e.g. waste asbestos-cement products, demolition waste
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Business, Economics & Management (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Emergency Management (AREA)
- Toxicology (AREA)
- Environmental & Geological Engineering (AREA)
- General Health & Medical Sciences (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
Description
Die Erfindung bezieht sich auf ein Verfahren zur Herstel lung von Zement unter Verwendung von dekontaminiertem Asbestze ment.The invention relates to a method of manufacture cement using decontaminated asbestos ment.
Asbestzement wurde viele Jahre als preisgünstiger Werk stoff in der Bauindustrie, z. B. als Verkleidungsmaterial und als Dachbedeckungsmaterial, verarbeitet. Im Wasserbau wurde es für Rohre verwendet, in Kraftwerken als Kondensatableiter in Kühltürmen. Es ist zwar wünschenswert, dieses gesundheitlich problematische Material zu entsorgen; es ist jedoch schwierig, die riesige Menge (geschätzt werden 25 Millionen Tonnen an Asbestzement in Deutschland) gefahrlos zu deponieren.Asbestos cement has been an inexpensive plant for many years fabric in the construction industry, e.g. B. as cladding material and processed as roofing material. It was in hydraulic engineering used for pipes, as steam traps in power plants Cooling towers. While it is desirable, this is health related dispose of problematic material; however, it is difficult the huge amount (estimated at 25 million tons Asbestos cement in Germany).
Aufgabe der vorliegenden Erfindung ist es, ein technisch durchführbares Verfahren anzugeben, welches die Wiederverwer tung von Asbestzement ermöglicht, ohne daß Abfallprodukte depo niert werden müssen. Diese Aufgabe wird durch die vorliegende Erfindung gelöst. Das erfindungsgemäße Verfahren zur Herstel lung von abbindefähigem Zement unter Vermischen der Rohstoffe zu einer Rohstoffmischung und Brennen der Rohstoffe ist dadurch gekennzeichnet, daß man die Rohstoffe teilweise oder vollstän dig durch dekontaminierten Asbestzement als Zuschlagstoff er setzt, wobei der dekontaminierte Asbestzement durch Behandeln von Asbestzement mit einer Fluor enthaltenden anorganischen Säure als Zersetzungsmittel, gegebenenfalls Abtrennen von Was ser, aus dem resultierenden Gemisch erhalten wurde.The object of the present invention is a technical feasible procedure specifying the reuse processing of asbestos cement without waste products being deposited must be renated. This task is accomplished by the present Invention solved. The method of manufacture according to the invention setting of cement that can be set while mixing the raw materials to a raw material mixture and burning of the raw materials characterized in that the raw materials are partially or completely dig by decontaminated asbestos cement as an additive sets, the decontaminated asbestos cement by treatment of asbestos cement with a fluorine-containing inorganic Acid as a decomposing agent, optionally separating what ser, was obtained from the resulting mixture.
Als Säure kann man beispielsweise Fluorwasserstoff, Hexa fluorokieselsäure oder Tetrafluordborsäure sowie deren Gemische verwenden. Als saures Salz kann man beispielsweise Ammonium-, Natrium- oder Kaliumsalze der genannten Säuren, beispielsweise Ammonium-, Natrium- oder Kaliumhydrogenfluorid verwenden. Ge wünschtenfalls kann man die Dekontamination des Asbestzements mit in reiner Form vorliegenden zersetzungsmitteln bewirken, gegebenenfalls unter Erhitzen. Beispielsweise kann man den Asbestzement mit Ammoniumhydrogenfluorid vermischen und erhit zen. Vorzugsweise geht man von wäßrigen Lösungen der Fluor enthaltenden anorganischen Säuren oder von wäßrigen Lösungen eines sauren Salzes einer Fluor enthaltenden anorganischen Säure aus. Bevorzugt verwendet man Flußsäure, Hexafluorokiesel säure oder ein Gemisch der beiden, insbesondere in Form wäß riger Lösungen. Besonders gute Wirkung erzielt man mit wäßrigen Lösungen, die 10 bis 40 Gew.-% des Zersetzungsmittels enthal ten. Es empfiehlt sich, den Asbestzement in kleinere Partikel zu überführen, z. B. durch Schreddern und Mahlen. Zweckmäßig neutralisiert man das nichtverbrauchte Zersetzungsmittel mit Kalk (CaO, Ca(OH)2 oder CaCO3) oder mit Kalkmilch und trennt Wasser, beispielsweise in einer Kammerfilterpresse, ab. Eine bevorzugte Ausführungsform der Erfindung ist daher dadurch gekennzeichnet, daß der dekontaminierte Asbestzement durch Behandeln von zerkleinertem Asbestzement mit einer wäßrigen Lösung einer Fluor enthaltenden anorganischen Säure oder einer wäßrigen Lösung eines sauren Salzes einer Fluor enthaltenden anorganischen Säure, Neutralisation des resultierenden Gemi sches mit Kalk oder Kalkmilch und gegebenenfalls Abtrennen von Wasser erhalten worden ist.Examples of acids which can be used are hydrogen fluoride, hexafluorosilicic acid or tetrafluoroboric acid and mixtures thereof. The acidic salt used can be, for example, ammonium, sodium or potassium salts of the acids mentioned, for example ammonium, sodium or potassium hydrogen fluoride. If desired, the asbestos cement can be decontaminated with disintegrants present in pure form, optionally with heating. For example, you can mix the asbestos cement with ammonium hydrogen fluoride and heat it. It is preferable to start from aqueous solutions of the fluorine-containing inorganic acids or from aqueous solutions of an acid salt of a fluorine-containing inorganic acid. Hydrofluoric acid, hexafluorosilicic acid or a mixture of the two, in particular in the form of aqueous solutions, is preferably used. A particularly good effect is achieved with aqueous solutions containing 10 to 40% by weight of the disintegrant. It is advisable to convert the asbestos cement into smaller particles, e.g. B. by shredding and grinding. It is advisable to neutralize the unused decomposing agent with lime (CaO, Ca (OH) 2 or CaCO 3 ) or with lime milk and separate water, for example in a chamber filter press. A preferred embodiment of the invention is therefore characterized in that the decontaminated asbestos cement by treating crushed asbestos cement with an aqueous solution of a fluorine-containing inorganic acid or an aqueous solution of an acidic salt of a fluorine-containing inorganic acid, neutralization of the resulting mixture with lime or lime milk and optionally separating water has been obtained.
Der Rohstoffmischung (übliche Rohstoffe wie Kalkstein, Ton, Kalkmergel, Tonmergel u. a. können verwendet werden) kann man den dekontaminierten Asbest in mehr oder weniger großer Menge zusetzen. Im Extremfall kann der dekontaminierte Asbest zement als einziger Rohstoff in den Zementofen gegeben werden; in diesem Fall ist der gesamte Rohstoff durch den dekontami nierten Asbestzement ersetzt. Vorteilhaft enthält die Rohstoff mischung vor dem Brennen 3 bis 100 Gew.-%, bezogen auf die Trockenmasse, des dekontaminierten Asbestzements. Selbstver ständlich kann man die Kennzahlen der Rohstoffe (Kalkstandard, Silikatmodul und Tonerdemodul) wie gewünscht einstellen.The raw material mixture (usual raw materials such as limestone, Clay, lime marl, clay marl and. a. can be used) one decontaminated asbestos in more or less large Add quantity. In extreme cases, the decontaminated asbestos cement is the only raw material to be placed in the cement kiln; in this case the entire raw material is through the decontami replaced asbestos cement. The raw material advantageously contains mixture before firing 3 to 100 wt .-%, based on the Dry matter, of decontaminated asbestos cement. Self ver the key figures of the raw materials (lime standard, Set the silicate module and clay module) as required.
Die Mischung wird dann in üblicher Weise gebrannt, wie üblich bei Temperaturen bis zu 1.500°C.The mixture is then burned in the usual manner, such as usual at temperatures up to 1,500 ° C.
Es ist ein Vorteil der Erfindung, daß Asbestzement, der ansonsten unter erhöhten Sicherheitsbedingungen deponiert wer den müßte, als Rohstoffquelle dient und eine rückstandslose Verarbeitung zu neuen hochwertigen Zementprodukten gewährlei stet wird. Natürliche Ressourcen werden daher geschont. Bei spielsweise kann man asbesthaltige Faserzementplatten, wie Eternitplatten, erfindungsgemäß über die Herstellung asbest freien Faserzements und Formung in asbestfreie Faserzementplat ten überführen. Außerdem hat sich gezeigt, daß durch Zugabe des mittels der angegebenen Zersetzungsmittels dekontaminierten Asbestzements ein Rohstoff oder eine Rohstoffmischung entsteht, welche eine herabgesetzte Sintertemperatur aufweist. Die Ener giekosten des Zementbrennens können daher gesenkt werden. Eine solche vorteilhafte Rohstoffmischung zum Herstellen von Zement ist ebenfalls Gegenstand der Erfindung. Die erfindungsgemäße Rohstoffmischung zum herstellen von Zement enthält übliche, CaO, SiO2, Al2O3 und Fe2O3 liefernde Rohstoffe, ist gekennzeich net durch einen Gehalt von, durch Kontaktieren von Asbestzement mit einer Fluor enthaltenden anorganischen Säure oder einem sauren Salz einer Fluor enthaltenden anorganischen Säure, er haltenen dekontaminierten Asbestzement.It is an advantage of the invention that asbestos cement, which would otherwise have to be deposited under increased security conditions, serves as a source of raw material and residue-free processing to new, high-quality cement products is guaranteed. Natural resources are therefore protected. For example, asbestos-containing fiber cement panels, such as Eternit panels, can be converted into asbestos-free fiber cement panels according to the invention via the production of asbestos-free fiber cement and molding. In addition, it has been found that adding the asbestos cement decontaminated by means of the specified decomposing agent produces a raw material or a raw material mixture which has a reduced sintering temperature. The energy costs of cement burning can therefore be reduced. Such an advantageous raw material mixture for producing cement is also the subject of the invention. The raw material mixture according to the invention for the production of cement contains conventional raw materials providing CaO, SiO 2 , Al 2 O 3 and Fe 2 O 3 , is characterized by a content of, by contacting asbestos cement with a fluorine-containing inorganic acid or an acidic salt Fluorine-containing inorganic acid, it contains decontaminated asbestos cement.
Eine besonders bevorzugte Rohstoffmischung ist gekenn zeichnet durch ein Gehalt von 3 bis 99 Gew.-% des dekontami nierten Asbestzements, insbesondere 50 bis 99 Gew.-%. Rest auf 100 Gew.-% sind übliche Rohstoffe wie Mergel, Tonmergel, Kalk stein, Ton, gegebenenfalls Wasser u. a. A particularly preferred mixture of raw materials is known characterized by a content of 3 to 99% by weight of the decontami asbestos cement, in particular 50 to 99% by weight. Rest on 100% by weight are common raw materials such as marl, clay marl and lime stone, clay, possibly water and. a.
Das folgende Beispiel soll die Erfindung weiter erläutern, ohne sie in ihrem Umfang einzuschränken. The following example is intended to explain the invention further, without restricting their scope.
10 kg Asbestzement (90 Gew.-% hydratisierter Zement) wurde geschreddert und auf eine Partikelgröße von maximal 0,5 mm gemahlen. Der Asbestzement wurde dann mit 5 l einer 20 Gew.-% HF enthaltenden wäßrigen Flußsäure-Lösung kontaktiert. Nach 15 Minuten wurde die entstehende Reaktionsmischung unter Ver setzten mit Kalkmilch neutralisiert. Die entstandene Suspension (eine breiige Masse) von Zement und Calciumfluorid wurde direkt in den Zementofen gegeben. Das Brennen erfolgte bei einer Tem peratur von 940°C.10 kg asbestos cement (90 wt .-% hydrated cement) was shredded and to a particle size of maximum 0.5 mm ground. The asbestos cement was then treated with 5 l of a 20% by weight HF containing aqueous hydrofluoric acid solution contacted. To The resulting reaction mixture was treated under Ver put neutralized with milk of lime. The resulting suspension (a pulpy mass) of cement and calcium fluoride became direct placed in the cement kiln. The firing was at a tem temperature of 940 ° C.
Claims (7)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4239565A DE4239565A1 (en) | 1992-11-25 | 1992-11-25 | Easy setting cement mixt. - contg. decontaminated asbestos cement which is opt. neutralised and is free from water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4239565A DE4239565A1 (en) | 1992-11-25 | 1992-11-25 | Easy setting cement mixt. - contg. decontaminated asbestos cement which is opt. neutralised and is free from water |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE4239565A1 true DE4239565A1 (en) | 1994-05-26 |
Family
ID=6473586
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE4239565A Withdrawn DE4239565A1 (en) | 1992-11-25 | 1992-11-25 | Easy setting cement mixt. - contg. decontaminated asbestos cement which is opt. neutralised and is free from water |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE4239565A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0658526A1 (en) * | 1993-12-17 | 1995-06-21 | Solvay Umweltchemie GmbH | Process for making asbestos-free binding material |
| EP0688742A1 (en) * | 1994-06-25 | 1995-12-27 | Institut für Baustoff- und Umweltschutz-Technologie IBU-tec | Method for treatment of asbestos-cement products and environmentally friendly use thereof |
| WO2024026575A1 (en) * | 2022-08-04 | 2024-02-08 | Envicore Inc. | Supplementary cementitious material composition and method of making |
-
1992
- 1992-11-25 DE DE4239565A patent/DE4239565A1/en not_active Withdrawn
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0658526A1 (en) * | 1993-12-17 | 1995-06-21 | Solvay Umweltchemie GmbH | Process for making asbestos-free binding material |
| EP0688742A1 (en) * | 1994-06-25 | 1995-12-27 | Institut für Baustoff- und Umweltschutz-Technologie IBU-tec | Method for treatment of asbestos-cement products and environmentally friendly use thereof |
| DE4423728A1 (en) * | 1994-06-25 | 1996-01-04 | Inst Baustoff Und Umweltschutz | Process for the treatment and environmentally sound recovery of asbestos cement products |
| US5676750A (en) * | 1994-06-25 | 1997-10-14 | Institut Fur Baustoff- Und Umweltshcutz-Technologie Ibu-Tec | Process of treatment and environment-friendly utilization of asbestos-cement products |
| WO2024026575A1 (en) * | 2022-08-04 | 2024-02-08 | Envicore Inc. | Supplementary cementitious material composition and method of making |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 8139 | Disposal/non-payment of the annual fee |