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Process for consolidating coal and/or rock in mines

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Publication number
EP0008127A1
EP0008127A1 EP19790102934 EP79102934A EP0008127A1 EP 0008127 A1 EP0008127 A1 EP 0008127A1 EP 19790102934 EP19790102934 EP 19790102934 EP 79102934 A EP79102934 A EP 79102934A EP 0008127 A1 EP0008127 A1 EP 0008127A1
Authority
EP
Grant status
Application
Patent type
Prior art keywords
magnesium
consolidating
coal
oxide
rock
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.)
Granted
Application number
EP19790102934
Other languages
German (de)
French (fr)
Other versions
EP0008127B1 (en )
Inventor
Hans-Guido Dr. Klinkner
Günter Culmann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Saarbergwerke AG
Original Assignee
Saarbergwerke AG
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

Links

Classifications

    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D9/00Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
    • E21D9/001Improving soil or rock, e.g. by freezing; Injections
    • E21D9/002Injection methods characterised by the chemical composition used

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.

Description

  • [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 process 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 especially applied where tectonic faults hinder the drifting or complicate the coal mining in mining operations Ausböschungen of 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 a dispersion for injection 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. however, dispersions are needed for certain applications that 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 widely varied in a known from the DT-PS 2204281 method by changing the ratio of the shares of magnesium chloride solution, 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 for the curing is achieved, which can no longer be maintained.
  • [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 "Gluckauf-Forschungshefte", December 1976, No. 6, page 243-245, hochacktivem by adding a proportion of 2.5 wt .-% magnesium oxide to a Misctiung of concentrated magnesium chloride solution, calcined magnesite, and the curing time of the dispersion Bentonitmehl to further reduce and at the same time to improve the autogenous after short periods 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 the addition of a proportion of more than 2.5 wt .-% of highly active magnesium oxide, the values ​​for the adhesive strength during the setting process through a minimum, and then rises 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 type mentioned at the beginning, on the setting time of the dispersion is relatively short and in which the values ​​for the adhesive strength of the dispersion during the set continuously to the end value increase.
  • [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. According to the invention this is achieved in that a proportion of more than 2.5 wt .-% is added to highly active magnesium oxide and that in addition a setting time retarding the 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 of the dispersion up to 1 wt .-% added in an amount. 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 in that shortened by the addition of the setting retarder, the setting time, that the values ​​for the adhesive strength to rise continuously to the end value, and that the values ​​for the adhesive strength of the cured dispersion are higher than without the addition of retarding agent.
  • [0009] [0009]
    Hochaktives Magnesiumoxid wird durch Brennen von gefälltem Magnesiumoxid erhalten. Highly active magnesium oxide is obtained by firing of precipitated magnesium oxide. as verbessert die Verleimungsfähigkeit der Dispersion und ermöglicht ein Eindringen in sehr dünne Spalten im Gestein. as Verleimungsfähigkeit improves 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 magnesium oxide dispersion is also called cold operating points underground. Die Abbindezeit wird nicht proportional zum Anteil an zugesetztem hochsktivem Magnesiumoxid herabgesetzt. The setting time is not reduced in proportion to the 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 characteristics: 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 contained 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 corresponds to the time to reach 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 a glue joint between two unglazed tiles.
    Figure imgb0001
  • [0012] [0012]
    Die Abbindezeit der Dispersion erhöht sich linear mit den Anteil an zugesetztem Borax. The setting time 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 ), KMnO 4 (potassium permanganate), (NH 4) Mo 10 12O 41 .7H 2 O or (NH 4) 6 Mo 7 O 24 .4H 2 O (NH 4) 2 MoO 4 (ammonium molybdate) were tested extensively and as well as borax (Na 2 B 4 O 7) or Boraxdekahydrat have been found suitable.

Claims (14)

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 process for consolidating coal and / or rock in mining by the injection of a hardening after its penetration dispersion of a magnesium chloride solution, calcined magnesite, highly-active magnesium oxide, bentonite and water, characterized in that a proportion of more than 2.5 by weight % is added to highly active Magneaiumoxid and that additionally a Abbisdung the 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 of 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 of 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. A method according to one of the 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. A 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 of 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. A 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.
EP19790102934 1978-08-12 1979-08-13 Process for consolidating coal and/or rock in mines Expired EP0008127B1 (en)

Priority Applications (2)

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DE19782835451 DE2835451C2 (en) 1978-08-12 1978-08-12
DE2835451 1978-08-12

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EP0008127B1 EP0008127B1 (en) 1982-04-14

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