DEP0049977DA - Procedure for removing scale - Google Patents
Procedure for removing scaleInfo
- Publication number
- DEP0049977DA DEP0049977DA DEP0049977DA DE P0049977D A DEP0049977D A DE P0049977DA DE P0049977D A DEP0049977D A DE P0049977DA
- Authority
- DE
- Germany
- Prior art keywords
- scale
- procedure
- removing scale
- lye
- iron
- 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.)
- Expired
Links
- 238000000034 method Methods 0.000 title claims description 3
- 229910001854 alkali hydroxide Inorganic materials 0.000 claims description 2
- 150000008044 alkali metal hydroxides Chemical class 0.000 claims description 2
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 23
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 10
- 235000011121 sodium hydroxide Nutrition 0.000 description 9
- 239000000243 solution Substances 0.000 description 6
- 229910052742 iron Inorganic materials 0.000 description 5
- 239000010802 sludge Substances 0.000 description 4
- 238000009835 boiling Methods 0.000 description 2
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Inorganic materials [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 1
- ZOMBKNNSYQHRCA-UHFFFAOYSA-J calcium sulfate hemihydrate Chemical compound O.[Ca+2].[Ca+2].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O ZOMBKNNSYQHRCA-UHFFFAOYSA-J 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000011507 gypsum plaster Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910000027 potassium carbonate Inorganic materials 0.000 description 1
- 235000019353 potassium silicate Nutrition 0.000 description 1
- 150000004760 silicates Chemical class 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Description
Verfahren zur Beseitigung von Kesselstein» Procedure for removing scale »
Es ist bekannt, daß man Kesselstein in manchen Fällen durch Behandeln mit wässrigen Lösungen von Säuren oder alkalisch wirkenden Stoffen wie Soda9 verdünnter Natronlauge usw. beseitigen kann» Doch, sind diese Mittel nicht allgemein anwendbar, sodaß eine vollständige Entfernung γοη Kesselstein auf diese Weise nicht möglich ist» Es wurde nun gefunden, daß man Kesselstein mit Sicherheit und in einem Arbeitsgang en-fcf ernen kann, wenn man ihn in der Wärme mit zweckmäßig konz» Lösungen von Alkalihydroxyden, die nötigenfalls mit Zusätzen -sur Verhinderung von Laugesprödigkeit versehen sein können, behandelt* Es empfiehlt sich, die Lösung in der Siedehitze auf den Kesselstein einwirken zu lassen» Die Behandlungsdauer richtet sich nach der Beschaffenheit des Kesselsteins, der Konzentration der Lauge und der Temperatur» In einer kochenden 50 %igen Natronlauge löst sich der übliches teils aus Gips, teils aus Kaliumcarbonat und Silikaten bestehende Kesselstein schon nach 4 ~ 5 Stunden« Ein chemischer Angriff des Eisens findet nicht statt» Die einmal gebrauchte Lauge kann nach Abtrennung des Kesselsteinschlamms immer wieder verwendet werden, nötigenfalls unter gelegentlicher Wiederaufkonzentration» Es kann zweckmäßig sein, die Behandlung unter Druck vorzunehmen, insbesondere 5 wenn mit verdünnteren Laugen gearbeitet wird oder wenn aus anderen Gründen höhere- Temperaturen erwünscht sind*It is known that you can remove scale in some cases by treating with aqueous solutions of acids or alkaline substances such as soda 9, dilute caustic soda, etc. "But, these agents are not generally applicable, so that a complete removal of γοη scale in this way is not possible It has now been found that scale can be removed with certainty and in one operation if it is heated with appropriately concentrated solutions of alkali hydroxides, which, if necessary, can be provided with additives to prevent lye brittleness, Treated * It is advisable to let the solution act on the scale at the boiling point »The duration of treatment depends on the nature of the scale, the concentration of the lye and the temperature» The usual s is partially dissolved in a boiling 50% sodium hydroxide solution Plaster of paris, scale consisting partly of potassium carbonate and silicates after 4 ~ 5 hours Mixed attack of the iron does not take place »Once the lye has been used, it can be used again and again after the limescale sludge has been separated off, if necessary with occasional re-concentration Reasons higher temperatures are desirable *
Eine Probe Kesselstein, von ungefährer Zusammensetzung?A sample of scale, of approximate composition?
29,ο $ SO3
44Sο % CaO29, ο $ SO 3
44 S ο % CaO
2*5 % MgO
1855 % GO2 2 * 5 % MgO
18 5 5 % GO 2
1,8 % SiO2 1.8 % SiO 2
295 % Wasser,2 9 5 % water,
wurde mit 5° $iger Katronlauge 3 Stunden am Rüokilußkühler gekocht» lach dem Abkühlen war der Kesselstein zu einem feinen Schlamm zerfallen» Die Lauge besaß nach. Abfilterung des Schlammes noch einen Gehalt von 49 % IaOH=it was boiled with 5% sodium hydroxide solution for 3 hours on the oil cooler. "After cooling, the scale had disintegrated into a fine sludge." The lye still possessed. Filtering off the sludge still has a content of 49 % IaOH =
^in mit Kesselstein verkrustetes Stück Eisenrohr wurde 6 Stunden lang mit 4o foiger Katronlauge am Rückflußkühler gekocht. Nach dieser Behandlung hatte sich der Kesselstein restlos vom Eisen gelöst und ließ sich,, teils als Schlamm? teils als Schalen durch Spülen aus dem Behälter entfernen.^ A piece of iron pipe encrusted with scale was refluxed for 6 hours with 40% sodium hydroxide solution. After this treatment, the scale had completely loosened from the iron and could be left, "partly as sludge?" partly removed as shells from the container by rinsing.
Ein weiteres mit Kesselstein verkrustetes Stück Eisenrohr wurde 8 Stunden lang in einer. 2o ^igen natronlauge auf 19o - 2oo unter 1o atü Druck erhitzt» Auch hier war ohne irgendwelche mechanische' Behandlung nach Beendigung des Versuches der Eesselstein vollständig v©m Eisen gelöste Another scale-encrusted piece of iron pipe was used in a. 2o ^ igen sodium hydroxide solution heated to 19o - 2oo under 10 atmospheric pressure » Here, too, without any mechanical treatment, the Eesselstein was completely dissolved from the iron after the end of the experiment
Claims (1)
Family
ID=
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