DE4444522A1 - Process for recycling esp. asbestos contg. cement materials - Google Patents
Process for recycling esp. asbestos contg. cement materialsInfo
- Publication number
- DE4444522A1 DE4444522A1 DE4444522A DE4444522A DE4444522A1 DE 4444522 A1 DE4444522 A1 DE 4444522A1 DE 4444522 A DE4444522 A DE 4444522A DE 4444522 A DE4444522 A DE 4444522A DE 4444522 A1 DE4444522 A1 DE 4444522A1
- Authority
- DE
- Germany
- Prior art keywords
- asbestos
- cement
- contg
- clinker
- esp
- 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- Withdrawn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
- 238000000034 method Methods 0.000 title claims abstract description 16
- 239000004568 cement Substances 0.000 title claims abstract description 10
- 239000010425 asbestos Substances 0.000 title claims abstract description 8
- 229910052895 riebeckite Inorganic materials 0.000 title claims abstract description 8
- 239000000463 material Substances 0.000 title claims abstract description 7
- 238000004064 recycling Methods 0.000 title 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000010802 sludge Substances 0.000 claims abstract description 4
- 239000007858 starting material Substances 0.000 claims abstract description 3
- 230000015572 biosynthetic process Effects 0.000 claims abstract 2
- 239000000203 mixture Substances 0.000 claims description 7
- 239000000835 fiber Substances 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims description 3
- 238000010304 firing Methods 0.000 claims description 2
- 238000002485 combustion reaction Methods 0.000 abstract 1
- 239000002912 waste gas Substances 0.000 abstract 1
- 239000002994 raw material Substances 0.000 description 6
- 238000001035 drying Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 235000019738 Limestone Nutrition 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 239000008207 working material Substances 0.000 description 1
Classifications
-
- 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
-
- 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
-
- 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
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
Description
In der Zementindustrie werden insbesondere zwei Verfahrensprinzipien bei der Herstellung des Rohmaterials, welches meistens aus einer Mischung aus Kalkstein und Ton im Verhältnis von rund 4 : 1 (üblich sind auch Sandzusätze) besteht, angewandt. Gegenüber dem Trockenverfahren zur Aufbereitung der Rohmischung wird beim Naßverfahren das Rohmaterial mit Überschußwasser zu einem Schlamm vermahlen, welcher 35 bis 40 Gew.-% Wasser, das vor dem Brennen im Drehrohrofen verdampft, enthält. Durch den Wassergehalt der Mischung ist allerdings die benötigte Energiemenge im Vergleich zum Trockenverfahren etwa doppelt so hoch. Neue Öfen für das Naßverfahren werden nur noch für extreme Rohmaterialbedingungen (z. B. Wassergehalt des Rohmaterials < 20 Gew.-%, in der chemischen Zusammensetzung schwankende Vorkommen bzw. Ausgangsstoffe) gebaut (vgl. dazu: Umwelt- Handbuch - Arbeitsmaterialien zur Erfassung und Bewertung von Umweltwirkungen. Bd. II: Agrarwirtschaft, Bergbau/Energie, Industrie/Gewerbe. Hrsg.: Bundesministerium für wirtschaftliche Zusammenarbeit. Friedr. Vieweg & Sohn Verlagsgesellschaft GmbH, Braunschweig 1993). In the cement industry there are two in particular Process principles in the production of the raw material, which mostly consists of a mixture of limestone and clay in the Ratio of around 4: 1 (sand additives are also common) exists, applied. Compared to the dry process for Preparation of the raw mixture is the wet process Grind raw material with excess water to a sludge, which 35 to 40 wt .-% water, which before burning in Rotary tube furnace evaporates, contains. Due to the water content of the Mixing is, however, the amount of energy required in the About twice as high compared to the dry process. New Ovens for the wet process are only used for extreme ones Raw material conditions (e.g. water content of the raw material < 20 wt .-%, fluctuating in the chemical composition Occurrence or raw materials) (see also: environmental Manual - Working materials for the collection and evaluation of Environmental impacts. Vol. II: Agriculture, Mining / Energy, Industry / trade. Ed .: Federal Ministry of economic Cooperation. Friedr. Vieweg & Sohn Verlagsgesellschaft GmbH, Braunschweig 1993).
Erfindungsgemäß wird das Naßverfahren zur Aufbereitung von Rohmischungen für den Brennprozeß angewandt, wenn es gilt, asbesthaltige zementgebundene Massen, insbesondere Asbestzement risikoarm zu entsorgen und das umgewandelte Material, in dem keine Fasern mehr vorhanden sind, als Wertstoff in den Stoffkreislauf zurückzuführen, indem aus dem Abfallmaterial, üblicherweise gemeinsam mit konventionellen Rohstoffen, ein hydraulisch aktives Bindemittel hergestellt wird.According to the wet process for the preparation of Raw mixes used for the firing process when it applies cementitious compositions containing asbestos, in particular Dispose of asbestos cement with little risk and the converted Material in which there are no more fibers than Recyclable material in the material cycle by from the Waste material, usually together with conventional ones Raw materials, a hydraulically active binder becomes.
Die asbesthaltigen Massen werden erfindungsgemäß als zumindest ein Ausgangsstoff für die Rohmischungen eingesetzt, unter Wasserzusatz in Rohrmühlen zu Rohschlamm vermahlen, so daß dabei keinerlei Faseremissionen in die Atmosphäre möglich sind, und anschließend im Drehrohrofen des Naßverfahrens getrocknet und durch den bei etwa 140°C ablaufenden Brennprozeß in Zementklinker umgewandelt, wobei die Zementanlage zweckmäßigerweise mit einer Filtervorrichtung ausgestattet ist, um eventuell auftretende Faseremissionen aus der Trockenphase des Prozesses (im Abgas) zu verhindern.The asbestos-containing compositions are as at least one starting material used for the raw mixtures, ground to raw sludge with the addition of water in tube mills, that no fiber emissions into the atmosphere are possible are, and then in the rotary kiln of the wet process dried and by the running at about 140 ° C. Burning process converted into cement clinker, the Cement plant expediently with a filter device is equipped to detect any fiber emissions to prevent from the dry phase of the process (in the exhaust gas).
Claims (1)
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4444522A DE4444522A1 (en) | 1994-11-30 | 1994-11-30 | Process for recycling esp. asbestos contg. cement materials |
| DE19509706A DE19509706A1 (en) | 1994-11-30 | 1995-03-09 | Process for recycling asbestos cement without environmental hazard |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4444522A DE4444522A1 (en) | 1994-11-30 | 1994-11-30 | Process for recycling esp. asbestos contg. cement materials |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE4444522A1 true DE4444522A1 (en) | 1996-06-05 |
Family
ID=6535788
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE4444522A Withdrawn DE4444522A1 (en) | 1994-11-30 | 1994-11-30 | Process for recycling esp. asbestos contg. cement materials |
| DE19509706A Withdrawn DE19509706A1 (en) | 1994-11-30 | 1995-03-09 | Process for recycling asbestos cement without environmental hazard |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE19509706A Withdrawn DE19509706A1 (en) | 1994-11-30 | 1995-03-09 | Process for recycling asbestos cement without environmental hazard |
Country Status (1)
| Country | Link |
|---|---|
| DE (2) | DE4444522A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998002392A1 (en) * | 1996-07-15 | 1998-01-22 | Eternit Ag | Method for disposing of fibre cement waste products |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3061733A1 (en) * | 2015-02-24 | 2016-08-31 | Ecological Services for Environment S.r.l. | Process for inerting residual materials containing asbestos |
-
1994
- 1994-11-30 DE DE4444522A patent/DE4444522A1/en not_active Withdrawn
-
1995
- 1995-03-09 DE DE19509706A patent/DE19509706A1/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998002392A1 (en) * | 1996-07-15 | 1998-01-22 | Eternit Ag | Method for disposing of fibre cement waste products |
Also Published As
| Publication number | Publication date |
|---|---|
| DE19509706A1 (en) | 1996-09-12 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| AG | Has addition no. |
Ref country code: DE Ref document number: 19509706 Format of ref document f/p: P |
|
| 8139 | Disposal/non-payment of the annual fee | ||
| 8170 | Reinstatement of the former position | ||
| 8139 | Disposal/non-payment of the annual fee |