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Publication numberEP0008127 A1
Publication typeApplication
Application numberEP19790102934
Publication date20 Feb 1980
Filing date13 Aug 1979
Priority date12 Aug 1978
Also published asDE2835451A1, DE2835451C2, EP0008127B1
Publication number1979102934, 79102934, 79102934.1, EP 0008127 A1, EP 0008127A1, EP-A1-0008127, EP0008127 A1, EP0008127A1, EP19790102934, EP79102934
InventorsHans-Guido Dr. Klinkner, Günter Culmann
ApplicantSaarbergwerke Aktiengesellschaft
Export CitationBiBTeX, EndNote, RefMan
External Links: Espacenet, EP Register
Process for consolidating coal and/or rock in mines
EP 0008127 A1
Abstract
1. A process for consolidating coal and/or rock in mining by the injection of a dispersion which hardens after its entry and which comprises a magnesium chloride solution, calcined magnesite, highly-active magnesium oxide, bentonite and water, characterized in that an amount of more than 2.5 % by weight of hyghly-active magnesium oxide is admixed and that, additionally, a chemical substance which retards setting is added.
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Claims(14)  translated from German
1. Verfahren zum Verfestigen von Kohle und/oder Gestein im Bergbau durch Injizieren einer nach ihrem Eindringen erhärtenden Dispersion aus einer Magnesiumchloridlösung, gebrannten Magnesit, hochaktivem Magnesiumoxid, Bentonit und Wasser, dadurch gekennzeichnet, daß ein Anteil von mehr als 2,5 Gew.-% an hochaktivem Magneaiumoxid beigemengt wird und daß zusätzlich ein die Abbisdung verzögernder chemischer Stoff zugesetzt wird. 1. A method for consolidating coal and / or rock in mining by injecting a hardening after its penetration dispersion of a magnesium chloride solution, burnt magnesite, highly active magnesium oxide, bentonite and water, characterized in that a proportion of more than 2.5 wt % is added to highly active Magneaiumoxid and that additionally the Abbisdung retarding chemical substance is added.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß der chemische Stoff in einer Gewichtsmenge bis zu 1% hinzugefügt wird. 2. The method according to claim 1, characterized in that the chemical substance is added in an amount by weight up to 1%.
3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß als chemischer Stoff ein Borat hinzugefügt wird. 3. The method according to claim 1 or 2, characterized in that a borate is added as the chemical substance.
4. Verfahren nach Anspruch 3, dadurch gekennzeichnet, daß als chemischer Stoff Borax hinzugefügt wird. 4. The method according to claim 3, characterized in that is added as the chemical substance borax.
5. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß als chemischer Stoff ein Natriumsalz einer Phosphorsäure zugesetzt wird. 5. The method according to claim 1 or 2, characterized in that a sodium salt of phosphoric acid is added as the chemical substance.
6. Verfahren nach Anspruch 5, dadurch gekennzeichnet, daß Natriumphosphat hinzugefügt wird. 6. The method according to claim 5, characterized in that sodium phosphate is added.
7. Verfahren nach einen der Ansprüche 1 oder 2, dadurch gekennzeichnet, daß als chemischer Stoff ein Sulfat hinzugefügt wird. 7. Method according to one of claims 1 or 2, characterized in that a sulphate is added as the chemical substance.
8. Verfahren nach Anspruch 7, dadurch gekennzeichnet, daß Natriumsulfat (Na 2 SO 4 ) hinzugefügt wird. 8. The method according to claim 7, characterized in that sodium sulphate (Na 2 SO 4) is added.
9. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß als chemischer Stoff ein Permanganat hinzugefügt wird. 9. The method according to claim 1 or 2, characterized in that a permanganate is added as the chemical substance.
10. Verfahren nach Anspruch 9, dadurch gekennzeichnet, daß Kuliumpermaganat (KMnO 4 ) hinzugefügt wird. 10. The method according to claim 9, characterized in that Kuliumpermaganat (KMnO 4) is added.
11. Verfahren nach einem der Ansprüche 1 oder 2, dudurch gekennzeichnet, daß als chemischer Stoff ein Fluorid hinzugefügt wird. 11. The method according to any one of claims 1 or 2, dudurch in that a fluoride is added as the chemical substance.
12. Verfahren nach Anspruch 11, dadurch gekennzeichnet, daß Natriumfluorid (NaF) hinzugefügt wird. 12. The method according to claim 11, characterized in that sodium fluoride (NaF) is added.
13. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß als chemischer Stoff ein Molybdat hinzugefügt wird. 13. The method according to claim 1 or 2, characterized in that a molybdate is added as the chemical substance.
14. Verfahren nach einem der Ansprüche 1-13, dadurch gekennzeichnet, daß der chemische Stoff wasserlöslich ist und der Magnesiumchloridlösung zugesetzt wird. 14. The method according to any one of claims 1-13, characterized in that the chemical substance is water-soluble and the magnesium chloride solution is added.
Description  translated from German
  • [0001] [0001]
    Die Erfindung bezieht sich auf ein Verfahren zum Verfestigen von Kohle und/oder Gestein durch Injizieren einer nach ihrem Eindringen erhärtenden Dispersion aus einer Magnesiumchloridlösung, gebranntem Magnesit, hochaktivem Magnesiumoxid, Bentonit und Wasser. The invention relates to a method for consolidating coal and / or rock by injecting a hardening after its penetration dispersion of a magnesium chloride solution, calcined magnesite, highly active magnesium oxide, bentonite and water.
  • [0002] [0002]
    Derartige Verfahren werden besonders dort angewendet, wo tektonische Störungen den Streckenvortrieb behindern bzw. in Abbaubetrieben Ausböschungen des Kohlestoßes die Kohlegewinnung erschweren. Such methods are used especially where tectonic faults impede tunneling or hinder the coal extraction in mining operations Ausböschungen the coal shock.
  • [0003] [0003]
    Voraussetzung für den praktischen Einsatz einer Injektionsdispersion untertage ist neben niedriger Viskosität und guter Verleimungsfähigkeit eine ausreichend lange Aushärtungszeit. Prerequisite for the practical use of an injection dispersion underground is next to low viscosity and good Verleimungsfähigkeit a sufficiently long curing time. Für bestimmte Anwendungsfälle werden dagegen Dispersionen benötigt, die relativ schnell aushärten. For certain applications, on the other hand, dispersions are required which cure relatively quickly. Die Aushärtungszeit kann bei einem aus der DT-PS 2204281 bekannten Verfahren durch Veränderung des Verhältnisses der Anteile an Magnesiumchloridlösung, Magnesiumoxid und Bentonitmehl weitgehend variiert werden. The curing time can be varied widely in a known from DT-PS 2204281 process by changing the ratio of the shares of magnesium chloride, magnesium oxide and Bentonitmehl. Bei einem bestimmten Mischungsverhältnis wird jedoch ein unterer Grenzwert für die Aushärtezeit erreicht, der nicht mehr unterschritten werden kann. At a certain mixing ratio, however, a lower limit value for the curing is reached which can not be undershot.
  • [0004] [0004]
    Bekannt ist es aus "Glückauf-Forschungshefte", Dezember 1976, Heft 6, Seite 243-245, durch Zusatz eines Anteils von 2,5 Gew.-% hochacktivem Magnesiumoxid zu einer Misctiung aus konzentrierter Magnesiumchloridlösung, gebranntem Magnesit und Bentonitmehl die Aushärtezeit der Dispersion weiter zu verkürzen und zugleich die sich nach kurzen Standzeiten einstellenden Festigkeitswerte zu verbessern. It is known from "Glückauf Forschungshefte", December 1976, Issue 6, page 243-245, by the addition of a proportion of 2.5 wt .-% magnesium hochacktivem to Misctiung of concentrated magnesium chloride solution, calcined magnesite and Bentonitmehl the curing of the dispersion to further reduce and at the same time to improve the self-adjusting to short service lives strength values. Nachteilig ist, daß bei Zugabe eines Anteils von mehr als 2,5 Gew.-% hochaktivem Magnesiumoxid die Werte für die Klebkraft im Verlauf des Abbindevorgang ein Minimum durchlaufen, um danach wieder anzusteigen. A disadvantage is that with the addition of a proportion of more than 2.5 wt .-% of highly active magnesium oxide, the values for the bond strength during the setting process through a minimum and then increases again.
  • [0005] [0005]
    Aufgabe der Erfindung ist es daher, ein Verfahren der Eingangs genannten Art zu schaffen, bei den die Abbindezeit der Dispersion relativ kurz ist und bei den die Werte für die Klebkraft der Dispersion während des Abbindevorgangs kontinuierlich bis zum Endwert ansteigen. The object of the invention is therefore to provide a method of the aforementioned type, in which the setting of the dispersion is relatively short and in the values of the bond strength of the dispersion during setting continuously increase until the end value.
  • [0006] [0006]
    Erfindungsgemäß wird dies dadurch erreicht, daß ein Anteil von mehr als 2,5 Gew.-% an hochaktivem Magnesiumoxid beigemengt wird und daß zusätzlich ein die Abbindung verzögernder chemischer Stoff zugesetzt wird. This is inventively achieved by a share of more than 2.5 wt .-% is added to highly active magnesium oxide and in addition a the tying retarding chemical substance is added.
  • [0007] [0007]
    Als Abbindeverzögerer geeignete chemische Stoffe sind beispielsweise Borax, Natriumsulfat, Natriumfluorid, Kaliumpermanganat und Ammoniuamolybdat. As a retardant suitable chemical substances, for example borax, sodium sulfate, sodium fluoride, potassium permanganate and Ammoniuamolybdat.
  • [0008] [0008]
    Die Abbindeverzögerer werden der Dispersion in einer Menge bis zu 1 Gew.-% zugesetzt. The retarders are wt .-% of the dispersion is added in an amount up to the first Vorteilhaft ist, daß sich durch den Zusatz des Abbindeverzögerers die Abbindezeit verkürzt, daß die Werte für die Klebekraft kontinuierlich bis zum Endwert ansteigen und daß die Werte für die Klebkraft der ausgehärteten Dispersion höher sind als ohne Zusatz von Abbindeverzögerer. It is advantageous that shortens by adding the setting retarder setting time, that the values for the adhesive force continuously increases to the final value, and that the values of the bond strength of the cured dispersion are higher than without the addition of a retardant.
  • [0009] [0009]
    Hochaktives Magnesiumoxid wird durch Brennen von gefälltem Magnesiumoxid erhalten. Highly active magnesium oxide obtained by firing of precipitated magnesium. as verbessert die Verleimungsfähigkeit der Dispersion und ermöglicht ein Eindringen in sehr dünne Spalten im Gestein. as improves Verleimungsfähigkeit the dispersion and allows penetration into very thin fissures in the rock. Eine relativ schnelle Aushärtung der mit hochtktivem Magnesiumoxid versetzten Dispersion erfolgt auch an sogenannten kalten Betriebspunkten untertage. A relatively rapid curing of the offset with hochtktivem magnesia dispersion is also called cold operating points underground. Die Abbindezeit wird nicht proportional zum Anteil an zugesetztem hochsktivem Magnesiumoxid herabgesetzt. The setting is not proportional to the reduced amount of added magnesia hochsktivem.
  • [0010] [0010]
    Die Erfindung wird anhand von Versuchsergebnissen näher erläutert. The invention will be explained in more detail based on experimental results. Die bei den Versuchen verwendeten Materialien hatten folgende Eigenschaften: Technischer gebrannter Magmssit enthielt bei der chemische Analyse ca. 86,4 Gew.-% Magnesiumoxid; The materials used in the experiments had the following properties: Technical fired Magmssit contained in the chemical analysis of about 86.4 wt .-% magnesium oxide; die technisch konzentrierte Magnesiumchloridlösung hatte ein spezifisches Gewicht von 1,334 g/cm 3 ; the technically concentrated magnesium chloride solution had a specific gravity of 1.334 g / cm 3; hochaktives gefällten und gebranntes Magnesiumoxid enthielt 99 Gew.-% MgO; highly active precipitated and burned magnesium oxide containing 99 wt .-% MgO; das als Abbindeverzögerer im Versuch benutzte Borax lag in Form von Boraxdekahydrat vor. the borax used as a retardant in the experiment was in the form of Boraxdekahydrat.
  • [0011] [0011]
    Die Abbindezeit entspricht der Zeit bis zum Erreichen der Maximaltemperatur der aushärtenden Dispersion. The setting time corresponds to the time until reaching the maximum temperature of the curing dispersion. Die Klebkraft der erhärtenden Dispersion wird als Scherfestigkeit einer Leimfuge zwischen zwei unglasierten Kacheln gemessen. The bond strength of the hardening dispersion is measured as the shear strength of an adhesive joint between two unglazed tiles.
    Figure imgb0001
  • [0012] [0012]
    Die Abbindezeit der Dispersion erhöht sich linear mit den Anteil an zugesetztem Borax. The setting of the dispersion increases linearly with the amount of added borax.
    Figure imgb0002
    Ein Zusatz eines geringen Anteils von Boraxdekahydrat erhöht die Scherfestigkeit der ausgehärteten Dispersion und verlängert die Abbindezeit geringfügig. An addition of a small proportion of Boraxdekahydrat increases the shear strength of the cured dispersion and prolongs setting slightly.
  • [0013] [0013]
    Anstelle von konzentrierter technischer Magnesiumchloridlösung können auch Magnesiumchlorid-Flocken analog verwendet werden. Instead of concentrated technical magnesium chloride solution and magnesium chloride flakes can be used analogously.
  • [0014] [0014]
    Weitere Abbindeverzögerer sind andere borsaure Salze, Phosphate, Fluoride, Sulfate, Permanganate und Molybdate, wobei Na a SO 4 (Natriumsulfat), NaB0 2 (Natriumaetaborat), Na 3 PO 4 · 12H 2 O (Trinatriumorthophospmat bzw. Natriumphosphat), NaF (Natriumfluorid), KMnO 4 (Kaliumpermanganat), (NH 4 ) 10 Mo 12O 41 · 7H 2 O bzw. (NH 4 ) 6 Mo 7 O 24 · 4H 2 O (NH 4 ) 2 MoO 4 (Ammoniummolybdat) eingehend erprobt wurden und sich ebenso wie Borax (Na 2 B 4 O 7 ) bzw. Boraxdekahydrat als geeignet erwiesen haben. Other retarders are other borates, phosphates, fluorides, sulfates, permanganates and molybdates, with Na a SO 4 (sodium sulfate), NaB0 2 (Natriumaetaborat), Na 3 PO 4 · 12H 2 O (Trinatriumorthophospmat or sodium phosphate), NaF (sodium fluoride ), KMnO4 (potassium permanganate), (NH 4) 10 Mo 12O 41 .7H 2 O and (NH 4) 6 Mo 7 O 24 .4H 2 O (NH 4) 2 MoO 4 (ammonium) widely tested and as well as borax (Na 2 B 4 O 7) or Boraxdekahydrat have been found suitable.
Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
DE2204281B2 *29 Jan 197231 Jul 1975Saarbergwerke Ag, 6600 SaarbrueckenTitle not available
FR416683A * Title not available
FR1037566A * Title not available
GB1480161A * Title not available
US2543959 *1 Sep 19456 Mar 1951Fmc CorpMagnesium oxychloride cement mix and method of making
Non-Patent Citations
Reference
1 *H. KUHL, "Zement-Chemie", 3. Auflage, Band III, 1961, VEB-Verlag Technik, Berlin Seiten 299 bis 304.
2 *THE OIL AND GAS JOURNAL, 14. Marz 1977, P.N. PARKER et al. "Additives tailor cement to individual wells" Seiten 54 bis 58.
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Classifications
International ClassificationE21D9/00
Cooperative ClassificationE21D9/002
European ClassificationE21D9/00B2
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