DE3607819C1 - Process for preparing calcium hydroxide - Google Patents

Process for preparing calcium hydroxide

Info

Publication number
DE3607819C1
DE3607819C1 DE19863607819 DE3607819A DE3607819C1 DE 3607819 C1 DE3607819 C1 DE 3607819C1 DE 19863607819 DE19863607819 DE 19863607819 DE 3607819 A DE3607819 A DE 3607819A DE 3607819 C1 DE3607819 C1 DE 3607819C1
Authority
DE
Germany
Prior art keywords
calcium hydroxide
lime
reaction
specific surface
surface area
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
Application number
DE19863607819
Other languages
German (de)
Inventor
Heinz Bestek
Friedrich Dipl-Chem Dr Schmitz
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.)
Rheinische Kalksteinwerke GmbH
Original Assignee
Rheinische Kalksteinwerke GmbH
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
Priority claimed from DE3433228A external-priority patent/DE3433228C1/en
Application filed by Rheinische Kalksteinwerke GmbH filed Critical Rheinische Kalksteinwerke GmbH
Priority to DE19863607819 priority Critical patent/DE3607819C1/en
Application granted granted Critical
Publication of DE3607819C1 publication Critical patent/DE3607819C1/en
Expired legal-status Critical Current

Links

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
    • C04B2/00—Lime, magnesia or dolomite
    • C04B2/02—Lime
    • C04B2/04—Slaking
    • C04B2/06—Slaking with addition of substances, e.g. hydrophobic agents ; Slaking in the presence of other compounds

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)

Abstract

In the process according to the main Patent 3433228, the individual reaction steps in the dry slaking of lime (quicklime, calcium oxide) are controlled by them being separated in time and space in such a way that the use of reactive limes without strong grit formation is made possible even on a large industrial scale and a calcium hydroxide having a high specific surface area is obtained. The new process should further increase the specific surface area of the calcium hydroxide obtained and thus further improve the reactivity with gaseous materials. The slaking liquid is used in such an amount that from 3 to 12% of the lime are not converted into the calcium hydroxide. The specific surface area is about 10% larger than on reaction with the stoichiometric amount of water. Preparation of calcium hydroxide having improved absorbence.

Description

Das Hauptpatent 34 33 228 betrifft ein Verfahren zur Herstellung von trockenem Kalziumhydroxid durch Löschen von feinstückigem oder gemahlenem, weich gebranntem Kalk, wobei der Kalk mit einer Löschflüssigkeit, bestehend aus 30 bis 50 Volumenteilen Wasser und 50 bis 70 Volumenteilen eines reaktionsverzögernden organischen Lösungsmittels, bei einer Temperatur kleiner als 45°C in einem Mischgefäß (2) intensiv und homogen vermischt wird, die Reaktionsmischung in ein Hauptreaktionsgefäß (4) überführt wird, wo sie mittels einer Heizeinrichtung auf eine Temperatur von 50 bis 70°C gebracht wird, die Endreaktion in einem weiteren Reaktionsgefäß (5) stattfindet und im Mischgefäß (2) das Verhältnis von Kalk zu Löschflüssigkeit so gewählt wird, daß in dem weiteren Reaktionsgefäß (5) eine Reaktionsendtemperatur von 85 bis 110°C erreicht wird.The main patent 34 33 228 relates to a process for the production of dry calcium hydroxide by extinguishing finely divided or ground, softly burnt lime, the lime with an extinguishing liquid consisting of 30 to 50 parts by volume of water and 50 to 70 parts by volume of a reaction-delaying organic solvent Temperature below 45 ° C in a mixing vessel ( 2 ) is mixed intensively and homogeneously, the reaction mixture is transferred to a main reaction vessel ( 4 ), where it is brought to a temperature of 50 to 70 ° C by means of a heating device, the final reaction in one further reaction vessel ( 5 ) takes place and in the mixing vessel ( 2 ) the ratio of lime to extinguishing liquid is selected so that a final reaction temperature of 85 to 110 ° C is reached in the further reaction vessel ( 5 ).

Bei dem Verfahren nach dem Hauptpatent werden die einzelnen Reaktionsschritte bei der Trockenlöschung von Kalk durch zeitliche und räumliche Trennung so gesteuert, daß der Einsatz von reaktionsfähigen Kalken ohne starke Grießbildung auch großtechnisch möglich wird und dabei ein Kalziumhydroxid mit besonders großer spezifischer Oberfläche entsteht.In the procedure under the main patent, the individual reaction steps in the dry extinguishing of Lime controlled by temporal and spatial separation that the use of reactive limes without strong Semolina formation is also possible on an industrial scale while doing so a calcium hydroxide with a particularly large specific Surface arises.

Der Erfindung liegt die Aufgabe zugrunde, das Verfahren nach dem Hauptpatent dahingehend zu verbessern, daß bei dem erhaltenen Kalziumhydroxid die spezifische Oberfläche vergrößert und damit die Reaktionsfähigkeit mit gasförmigen Stoffen weiter verbessert wird.The object of the invention is the method to improve after the main patent so that at the specific surface area of the calcium hydroxide obtained enlarged and thus the responsiveness with gaseous substances is further improved.

Dies gelingt dadurch, daß die Löschflüssigkeit in einer solchen Menge eingesetzt wird, daß 3 bis 12% des Kalkes nicht in das Kalziumhydroxid überführt werden. Die spezifische Oberfläche ist dabei etwa 10% größer als bei Umsetzung mit der stöchiometrischen Menge Wasser.This is achieved in that the extinguishing liquid in a such amount is used that 3 to 12% of the lime  not be converted into calcium hydroxide. The specific surface area is about 10% larger than in Reaction with the stoichiometric amount of water.

Das nach dem erfinderischen Verfahren erhaltene Kalziumhydroxid hat wegen der großen spezifischen Oberfläche eine verbesserte Absorptionsfähigkeit, was insbesondere für den Einsatz zur Entgiftung von Abgasen bei Müllverbrennungsanlagen von Bedeutung ist.The one obtained by the inventive method Calcium hydroxide has great specificity Surface improved absorbency what especially for use in the detoxification of exhaust gases is important in waste incineration plants.

Claims (1)

Verfahren zur Herstellung von trockenem Kalziumhydroxid durch Löschen von feinstückigem oder gemahlenem, weich gebranntem Kalk, wobei der Kalk mit einer Löschflüssigkeit, bestehend aus 30 bis 50 Volumenteilen Wasser und 50 bis 70 Volumenteilen eines reaktionsverzögernden organischen Lösungsmittels, bei einer Temperatur kleiner als 45°C in einem Mischgefäß (2) intensiv und homogen vermischt wird, die Reaktionsmischung in ein Hauptreaktionsgefäß (4) überführt wird, wo sie mittels einer Heizeinrichtung auf eine Temperatur von 50 bis 70°C gebracht wird, die Endreaktion in einem weiteren Reaktionsgefäß (5) stattfindet und im Mischgefäß (2) das Verhältnis von Kalk zu Löschflüssigkeit so gewählt wird, daß in dem weiteren Reaktionsgefäß (5) eine Reaktionsendtemperatur von 85 bis 110°C erreicht wird, nach Patent 34 33 228, dadurch gekennzeichnet, daß die Löschflüssigkeit in einer solchen Menge eingesetzt wird, daß 3 bis 12% des Kalkes nicht in das Kalziumhydroxid überführt werden.Process for the production of dry calcium hydroxide by extinguishing finely divided or ground, softly burned lime, the lime with an extinguishing liquid consisting of 30 to 50 parts by volume of water and 50 to 70 parts by volume of a reaction-retarding organic solvent at a temperature below 45 ° C. a mixing vessel ( 2 ) is mixed intensively and homogeneously, the reaction mixture is transferred to a main reaction vessel ( 4 ), where it is brought to a temperature of 50 to 70 ° C by means of a heating device, the final reaction takes place in a further reaction vessel ( 5 ) and in the mixing vessel ( 2 ) the ratio of lime to extinguishing liquid is selected such that a final reaction temperature of 85 to 110 ° C is reached in the further reaction vessel ( 5 ), according to patent 34 33 228, characterized in that the extinguishing liquid in such an amount is used that 3 to 12% of the lime are not converted into the calcium hydroxide.
DE19863607819 1984-09-11 1986-03-08 Process for preparing calcium hydroxide Expired DE3607819C1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19863607819 DE3607819C1 (en) 1984-09-11 1986-03-08 Process for preparing calcium hydroxide

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3433228A DE3433228C1 (en) 1984-09-11 1984-09-11 Process for the production of calcium hydroxide
DE19863607819 DE3607819C1 (en) 1984-09-11 1986-03-08 Process for preparing calcium hydroxide

Publications (1)

Publication Number Publication Date
DE3607819C1 true DE3607819C1 (en) 1988-01-07

Family

ID=25824594

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19863607819 Expired DE3607819C1 (en) 1984-09-11 1986-03-08 Process for preparing calcium hydroxide

Country Status (1)

Country Link
DE (1) DE3607819C1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3826971A1 (en) * 1988-08-09 1990-02-15 Ftu Gmbh Process for preparing modified calcium hydroxides for gas and waste gas purification using concentrates of active substances
CN103495368A (en) * 2013-09-17 2014-01-08 南昌大学 Preparation method of thermo-magnetic dual responsive mesoporous silicon microspheres
US11059748B2 (en) * 2016-07-11 2021-07-13 General Electric Technology Gmbh Integrated lime hydrator

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
NICHTS ERMITTELT *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3826971A1 (en) * 1988-08-09 1990-02-15 Ftu Gmbh Process for preparing modified calcium hydroxides for gas and waste gas purification using concentrates of active substances
CN103495368A (en) * 2013-09-17 2014-01-08 南昌大学 Preparation method of thermo-magnetic dual responsive mesoporous silicon microspheres
US11059748B2 (en) * 2016-07-11 2021-07-13 General Electric Technology Gmbh Integrated lime hydrator

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