DE733879C - Process for the manufacture of refractory products - Google Patents

Process for the manufacture of refractory products

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Publication number
DE733879C
DE733879C DES121636D DES0121636D DE733879C DE 733879 C DE733879 C DE 733879C DE S121636 D DES121636 D DE S121636D DE S0121636 D DES0121636 D DE S0121636D DE 733879 C DE733879 C DE 733879C
Authority
DE
Germany
Prior art keywords
melting
manufacture
zirconium
refractory products
zirconium silicate
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
DES121636D
Other languages
German (de)
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.)
Compagnie de Saint Gobain SA
Original Assignee
Compagnie de Saint Gobain SA
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
Application filed by Compagnie de Saint Gobain SA filed Critical Compagnie de Saint Gobain SA
Application granted granted Critical
Publication of DE733879C publication Critical patent/DE733879C/en
Expired legal-status Critical Current

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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
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/48—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on zirconium or hafnium oxides, zirconates, zircon or hafnates
    • C04B35/484—Refractories by fusion casting

Description

Verfahren zur Herstellung feuerfester Erzeugnisse Die Erfindung betrifft :ein Verfahren zur Herstellung feuerfester Erzeugnisse aus kristallisierte Zirkunerde enthaltenden Stoffen durch Schmelzen von Gemischen aus Zirkon (Zirkoniumsilicat) und Tonerde oder Magnesia.Process for making refractory articles The invention relates to : a process for the manufacture of refractory products from crystallized zirconia containing substances by melting mixtures of zirconium (zirconium silicate) and clay or magnesia.

Es ist bereits vorgeschlagen worden, keramische feuerfeste Erzeugnisse durch Brennen von Gemischen aus Zirko@niumsilicat und Aluminiumoxyd ohne Schmelzen herzustellen, wobei das Aluminiumoxyd in solchen Mengen zugesetzt wird, daß beim Bremen die gesamte freie Kieselsäure, die aus dem Zerfall des Zirkoniumsilicats herrührt, zu Aluminium-- Silicat gebunden wird.Ceramic refractory products have already been proposed by firing mixtures of zirconium silicate and aluminum oxide without melting produce, the aluminum oxide is added in such amounts that when Bremen all the free silica that comes from the decay of the zirconium silicate is bound to aluminum silicate.

Bei diesem Verfahren erfolgt also die Umsetzung in Gestalt einer Reaktion im festen Zustande lediglich durch den keramischen Brand und aus diesem Grunde ohne eine völlige Sicherheit dafür, daß die Zersetzung des Zirkoniumsilicats vollständig erfolgt und daß die zersetzten Stoffe im End,-rzeugnis irz völlig kristallisierter Form vorliegen.In this process, the conversion takes place in the form of a reaction in the solid state only through the ceramic fire and for this reason without complete assurance that the decomposition of the zirconium silicate will be complete takes place and that the decomposed substances in the end product are completely crystallized Form.

Ferner ist es bekannt, Zirkon enthaltende Stoffe mit Verbindungen des Calciums ])ei liolicn Temperaturen in Reaktion zu bringen.It is also known to use zirconium-containing substances with compounds of calcium]) to bring liolicn temperatures into reaction.

Die 1?rfinduug besteht demgegenüber darin, daß die Umsetzung im Verlauf eines Schmelzprozesses durchgeführt wird, derart, daß durch Schmelzen des Gemisches die gesamte freie Kieselsäure, die aus dem Zerfall des Zirkoniumsilicats herrührt, zu kristallisierten Verbindungen des Aluminiums oder Magnesiums gebunden wird.The 1? Rfinduug, on the other hand, is that the implementation in the course a melting process is carried out such that by melting the mixture all of the free silica resulting from the decomposition of the zirconium silicate, is bound to crystallized compounds of aluminum or magnesium.

Hierbei werden wesentlich höhere Temperaturcii als bei dem bcl,:annteal Verfahren,angewendet, und es wird ein Erzeugnis :erzielt, in welchem die Silicate des Aluminiums oder Magnesiums ebenso wie das von der Kieselsäure befreite Zirkonoxpd in kristallisierter Form vorhanden sind, d.h. es wird- ein völlig kristallisicrttr Körper erzeugt, der aus Zirkonoxyd einerseits und Aluminium oder Magnesiumsilicaten andcrscits besteht und der infolge des Fehlens von Kieselsäure in der glasigen Phase-eine außerordentliche Härte und Feuerfestigkeit besitzt.In this case, considerably higher temperatures are achieved than in the case of the bcl,: annteal Process, applied, and a product: obtained in which the silicates of aluminum or magnesium as well as zirconium oxide from which the silica has been removed are present in crystallized form, i.e. it becomes a completely crystallized form Body produced from zirconium oxide on the one hand and aluminum or magnesium silicates andcrscits exists and which is due to the absence of silica in the glassy phase-a possesses extraordinary hardness and fire resistance.

Das hergestellte Erzeugnis ist je nach seinem Gehalt an Zirkonerde geeignet als Schlcifmittcl, elektrischer Isolierstoff oder feuerfester «-"crkstotf; es besitzt auch eine aul,ic#rordentlich hohe Widerstandsfähigkeit geben chemische und mechanische Eingriffe wie die, dcncii 1),-ispi;-lsweisc die Ausmauerun-en von Glasschmelzöfen ausgesetzt sind.The product made is depending on its zirconia content suitable as a grinding material, electrical insulating material or fireproof "-" crkstotf; It also possesses an extremely high chemical resistance and mechanical interventions like the, dcncii 1), -ispi; -asweisc the walling out of Glass melting furnaces are exposed.

Die anteilige @1Icngc an kristallisierter Zirlcoiicrclc: im fertigen Erzeugnis kann man dadurc-li crliülicn, daß man dem zu schmelzenden Gemisch Zirkonerde als solche zufügt; man kann auch den Anteil an Silicaten erhöhen, indem man dem Gemisch IGeselsäure zusetzt, 'wobei natiülich zu beachten ist, daß- eine hinreichende Menge.. an Tonerde oder Magnesia vorhanden sein muß, um die gesamte Menge der hiesclsäure zu binden.The proportion of crystallized Zirlcoiicrclc: in the finished The product can be dadurc-li crliülicn by adding zirconia to the mixture to be melted as such inflicts; man can also increase the proportion of silicates, by adding i-gelic acid to the mixture, whereby it must of course be observed that- A sufficient amount .. of clay or magnesia must be present to make up the whole Amount of local acid to bind.

Claims (3)

PATENTANSPRÜCHE: i. Verfahren zur Herstellung feuerfester Erzeugnisse aus kristallisierter Zirkonerdv enthaltenden Stoffen durch Schmelzen von Gemischen aus Zirkon (Zirkoniumsilicat) und Tonerde oder Mac-nesia. dadurch gekennzeichnet, daß durch Schmelzen die freie Kieselsäure, die aus dem Zerfall des Zirkoniumsilicats herrührt, zu. 'lkrietä.llisierten Verbindungen des. Alumiiiiums.Ider Magnesiums gebunden wird. PATENT CLAIMS: i. Process for the manufacture of refractory products from substances containing crystallized zirconia by melting mixtures made of zirconium (zirconium silicate) and clay or Mac-nesia. characterized, that by melting the free silicic acid that results from the decomposition of the zirconium silicate stems from. Oiled compounds of aluminum and magnesium is bound. 2. Verfahren nach Anspruch i, dadurch gekennzeichnet, daß man dem Gemisch vor dem Schmelzen Zirkonerde hinzufügt. 2. The method according to claim i, characterized in that the Add zirconia to mixture before melting. 3. Verfahren nach Anspruch i, dadurch gekennzeichnet, daß man dem Gemisch vor dem Schmelzen Kieselsäure zufügt.3. The method according to claim i, characterized characterized in that silica is added to the mixture before melting.
DES121636D 1932-12-23 1933-03-19 Process for the manufacture of refractory products Expired DE733879C (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR733879X 1932-12-23

Publications (1)

Publication Number Publication Date
DE733879C true DE733879C (en) 1943-04-05

Family

ID=9127169

Family Applications (1)

Application Number Title Priority Date Filing Date
DES121636D Expired DE733879C (en) 1932-12-23 1933-03-19 Process for the manufacture of refractory products

Country Status (1)

Country Link
DE (1) DE733879C (en)

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