FR2461538A1 - SELF-CURING MIXTURE FOR THE MANUFACTURE OF FOUNDRY MOLDS AND CORES - Google Patents

SELF-CURING MIXTURE FOR THE MANUFACTURE OF FOUNDRY MOLDS AND CORES Download PDF

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FR2461538A1
FR2461538A1 FR8015953A FR8015953A FR2461538A1 FR 2461538 A1 FR2461538 A1 FR 2461538A1 FR 8015953 A FR8015953 A FR 8015953A FR 8015953 A FR8015953 A FR 8015953A FR 2461538 A1 FR2461538 A1 FR 2461538A1
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mixture
weight
parts
magnesia
self
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FR2461538B1 (en
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July Moiseevich Junovich
Viktor Naumovich Pertsovsky
Igor Petrovich Renzhin
Sergei Semenovich Zhukovsky
Vyacheslav Sergeevi Kolesnikov
Olga Evgenievna Nevskaya
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N PROIZV OB TULATSCHERMET
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22CFOUNDRY MOULDING
    • B22C1/00Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
    • B22C1/16Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents
    • B22C1/18Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of inorganic agents
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22CFOUNDRY MOULDING
    • B22C1/00Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
    • B22C1/16Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents
    • B22C1/18Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of inorganic agents
    • B22C1/181Cements, oxides or clays
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    • C04B35/622Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/626Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
    • C04B35/63Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B using additives specially adapted for forming the products, e.g.. binder binders
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Abstract

L'INVENTION CONCERNE LA FONDERIE. LE MELANGE AUTODURCISSANT FAISANT L'OBJET DE L'INVENTION EST DU TYPE COMPRENANT UNE CHARGE REFRACTAIRE, DE L'ACIDE ORTHOPHOSPHORIQUE, UN MATERIAU A BASE DE MAGNESIE CUITE A MORT, ET DE L'EAU, ET EST CARACTERISE EN CE QUE LE MATERIAU A BASE DE MAGNESIE CUITE A MORT EST UN COMPOSE DU TYPE SPINELLE DE MAGNESIUM, CALCINE A UNE TEMPERATURE DE 1600 A 1900C PENDANT 40 A 1600H. LA COMPOSITION DUDIT MELANGE EST LA SUIVANTE (PARTIES EN POIDS): ACIDE ORTHOPHOSPHORIQUE, 2 A 10; COMPOSE DU TYPE SPINELLE DE MAGNESIUM, 2 A 20; EAU, 0,5 A 6,0; CHARGE REFRACTAIRE, LE SOLDE. LE MELANGE EN QUESTION PEUT ETRE UTILISE POUR LA PRODUCTION DE MOULAGES EN ACIER, EN FONTE ET EN METAUX NON FERREUX.THE INVENTION CONCERNS THE FOUNDRY. THE SELF-CURING MIXTURE WHICH IS THE OBJECT OF THE INVENTION IS OF THE TYPE INCLUDING A REFRACTORY CHARGE, ORTHOPHOSPHORIC ACID, A MATERIAL BASED ON DEADLY COOKED MAGNESIA, AND WATER, AND IS CHARACTERIZED IN THAT THE MATERIAL A DEATH-COOKED MAGNESIA BASE IS A SPINEL-TYPE COMPOUND OF MAGNESIUM, CALCINATED AT A TEMPERATURE OF 1600 TO 1900C FOR 40 TO 1600H. THE COMPOSITION OF THE SAID MIXTURE IS AS FOLLOWS (PARTS BY WEIGHT): ORTHOPHOSPHORIC ACID, 2 TO 10; MAGNESIUM SPINEL-TYPE COMPOUND, 2 TO 20; WATER, 0.5 to 6.0; REFRACTORY CHARGE, THE BALANCE. THE MIXTURE IN QUESTION CAN BE USED FOR THE PRODUCTION OF STEEL, CAST IRON AND NON-FERROUS METALS.

Description

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La présente invention concerne le domaine de la fonderie et a notamment pour objet un mélange autodurcissant  The present invention relates to the field of foundry and particularly relates to a self-hardening mixture

pour la fabrication de moules et de noyaux.  for making molds and cores.

Lesdits mélanges autodurcissants sont généralement utilisés pour fabriquer les noyaux et les moules employés dans la production de moulages en acier, en fonte et en  Said self-hardening mixtures are generally used to make the cores and molds used in the production of steel castings, cast iron castings and castings.

métaux non ferreux.non-ferrous metals.

On connaît un mélange autodurcissant pour la fabri-  A self-hardening blend is known to the manufac-

cation de moules et de noyaux, comprenant une charge ré-  cation of molds and cores, comprising a

fractaire, une magnésite métallurgique broyée et de l'acide orthophosphorique (demande de brevet japonais nO 52-23882, cl. 11A212, publiée le 28 Juin 1977). Ce mélange est caractérisé par une durée d'utilisation réduite, une résistance mécanique insuffisante à l'état  fractary, ground metallurgical magnesite and orthophosphoric acid (Japanese Patent Application No. 52-23882, Cl, 11A212, published June 28, 1977). This mixture is characterized by a reduced duration of use, insufficient mechanical strength in the state

durci et une basse résistanc+ l'effritement.  hardened and low resistance + crumbling.

On connait aussi un mélange autodurcissant pour la fabrication de moules et de noyaux de fonderie, comprenant une charge réfractaire, de l'acide orthophosphorique, de l'eau et un matériau à base de magnésie cuite à mort, à savoir, une poudre de magnésie ou de chromite-magnésie métallurgique. Ce mélange est caractérisé par une réactivité excessive de la magnésie ou de la chromite-magnésie métallurgique avec l'acide orthophosphorique, ce qui complique le réglage de la durée d'utilisation et de la vitesse de durcissement du mélange, s'exprimant par un accroissement de la résistance mécanique du mélange dans la plage nécessaire, et influe d'une manière défavorable sur la résistance mécanique des moules et des noyaux de fonderie. Ce mélange est caractérisé par une durée  Also known is a self-hardening mixture for the manufacture of molds and foundry cores, comprising a refractory filler, orthophosphoric acid, water and a magnesia material cooked to death, namely, a magnesia powder. or metallurgical chromite-magnesia. This mixture is characterized by an excessive reactivity of magnesia or metallurgical chromite-magnesia with orthophosphoric acid, which complicates the adjustment of the duration of use and the rate of hardening of the mixture, expressed by an increase in the mechanical strength of the mixture in the necessary range, and adversely affects the mechanical strength of the molds and foundry cores. This mixture is characterized by a duration

d'utilisation de 5 à 8 secondes et une résistance mécani-  from 5 to 8 seconds and a mechanical resistance

que de 2,5 kg/cm2 à l'issue de 0,5 heure et de 22 kg/cm2  than 2.5 kg / cm2 at the end of 0.5 hours and 22 kg / cm2

au bout de 24 heures.after 24 hours.

On s'est donc proposé d'élargir la plage de réglage de la durée d'utilisation du mélange autodurcissant et de sa vitesse de durcissement, ainsi que d'accroître la résistance mécanique des moules et des noyaux de fonderie, par un choix plus approprié du matériau à base de magnésie  It has therefore been proposed to widen the range of adjustment of the duration of use of the self-hardening mixture and of its curing speed, as well as to increase the mechanical strength of the molds and foundry cores, by a more appropriate choice. magnesia-based material

cuite à mort.cooked to death.

Ce problème est résolu grâce à un mélange autodurcis-  This problem is solved thanks to a self-hardening

sant pour la fabrication de moules et de noyaux de fonderie, du type comprenant une charge réfractaire, de l'acide orthophosphorique, un matériau à base de magnésie cuite à mort et de l'eau, dans lequel, d'après l'invention, le matériau à base de magnésie cuite à mort est un composé du type spinelle de magnésium, calciné à une température de 1600 à 19001C pendant 40 à 1600 h, la composition dudit mélange étant la suivante (parties en poids): acide orthophosphorique...... 2 à 10 composé du type spinelle de magnésium.................. 2 à 20 eau................  for the manufacture of molds and foundry cores, of the type comprising a refractory filler, orthophosphoric acid, a dead-burnt magnesia material and water, in which, according to the invention, the dead-burned magnesia material is a magnesium spinel compound, calcined at a temperature of 1600 to 1900 ° C. for 40 to 1600 hours, the composition of said mixture being the following (parts by weight): orthophosphoric acid ... ... 2 to 10 magnesium spinel compound .................. 2 to 20 water ................

......... 0,5 à 6,0..DTD: charge réfractaire............ le solde.  ......... 0,5 to 6,0..DTD: refractory load ............ the balance.

L'utilisation dudit composé du type spinelle de  The use of said spinel type compound of

magnésium permet d'élargir la plage des durées d'utilisa-  magnesium makes it possible to widen the range of

tion de 2 à 3 fois, d'élargir la plage des vitesses de durcissement de 2 à 4 fois et d'accroître la résistance mécanique aux étapes initiale et finale de durcissement  2 to 3 times, widen the range of curing rates from 2 to 4 times and increase the mechanical strength at the initial and final curing stages

de 1,5 à 2 fois.from 1.5 to 2 times.

Il est recommandé que ledit composé du type spinelle de magnésium entrant dans la composition du mélange autodurcissant soit un produit obtenu par broyage de briques de magnésie-chromite usées provenant de la voûte  It is recommended that said magnesium spinel compound in the composition of the self-hardening mixture be a product obtained by grinding spent magnesia-chromite bricks from the vault.

réfractaire d'appareils d'aciérie.  refractory steelmaking equipment.

Il est avantageux, afin d'accroître la vitesse initiale de durcissement et la résistance mécanique générale du mélange, que ledit composé du type spinelle de  It is advantageous, in order to increase the initial curing speed and the overall mechanical strength of the mixture, that said spinel type compound of

magnésium entrant dans la composition du mélange autodurcis-  magnesium component of the self-hardening

sant soit un produit obtenu par broyage de la partie active,  a product obtained by grinding the active part,

séparée au préalable, desdites briques usées de magnésie-  previously separated from said used magnesia bricks

chromite. Le mélange autodurcissant pour la fabrication de moules et de noyaux de fonderie, faisant l'objet de  chromite. The self-hardening mixture for the production of molds and foundry cores, subject to

l'invention, est préparé de la façon suivante.  the invention is prepared in the following manner.

La charge réfractaire, par exemple du sable quartzeux ou une autre charge quelconque employée en fonderie, est  The refractory filler, for example quartz sand or any other filler used in a foundry, is

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mélangée à la poudre de composé du type spinelle de magnésium, calciné à une température de 1600 à 1900 C  mixed with magnesium spinel compound powder, calcined at a temperature of 1600 to 1900 C

pendant 40 à 1600 h. Ensuite on ajoute l'acide orthophos-  during 40 to 1600 h. Then add the orthophosphoric acid

phorique et l'eau et on continue le brassage pendant 1 à 2 mn.  phoric and water and stirring continues for 1 to 2 minutes.

Le mélange autodurcissant faisant l'objet de l'inven-  The self-hardening mixture subject of the invention

tion contient de 2 à 20 parties en poids de composé du type spinelle de magnésium. L'abaissement de la quantité de ce composé au-dessous de 2 parties en poids ne permet pas d'obtenir un mélange de résistance mécanique nécessaire, et son augmentation au dessus de 20 parties en poids est irrationnelle, car la vitesse de durcissement du mélange  It contains from 2 to 20 parts by weight of magnesium spinel compound. Lowering the amount of this compound to less than 2 parts by weight does not provide a mixture of necessary strength, and its increase above 20 parts by weight is irrational because the rate of hardening of the mixture

devient excessive.becomes excessive.

Le composé du type spinelle de magnésium est calciné au préalable à une température de 1600 à 1900 C pendant à 1600 h. A ce régime de calcination il se forme une structure de spinelle de magnésium. Si la température  The magnesium spinel compound is calcined beforehand at a temperature of 1600 to 1900 ° C for 1600 hours. At this calcination regime a magnesium spinel structure is formed. If the temperature

est inférieure à 1600 C et la durée de calcination inférieu-  is less than 1600 C and the calcination time inferior to

re à 40 h, ladite structure ne se forme pas. La calcination  at 40 h, said structure is not formed. Calcination

à une température supérieure à 1900 C et une durée supé-  at a temperature above 1900 C and a longer duration

rieure à 1600 h sont irrationnelles, vu que les compositions quantitatives et qualitatives en phases et chimiques ont  1600 hours are irrational, since quantitative and qualitative phase and chemical

déjà atteint leurs valeurs optimales.  already reached their optimum values.

Le mélange autodurcissant conforme à l'invention  The self-hardening mixture according to the invention

contient 2 à 10 parties en poids d'acide orthophosphorique.  contains 2 to 10 parts by weight of orthophosphoric acid.

Une quantité d'acide orthophosphorique inférieure à 2 parties en poids ne permet pas d'obtenir un mélange de résistance mécanique nécessaire, et l'augmentation de cette quantité au-dessus de 10 parties en poids n'a pas une influence  An amount of orthophosphoric acid of less than 2 parts by weight does not provide a mixture of necessary mechanical strength, and increasing this amount above 10 parts by weight does not influence

sensible sur les propriétés technologiques du mélange.  sensitive on the technological properties of the mixture.

L' ideorophosphorque peut être uilisé sxsforme e solutia nsaq.e.s de diffétaes caoatraticms. la quaEt totae de salutoem s dNiedefqcn se la teneur en acide, comptée en acide non dilué, se situe entre 2 et 10 parties en poids. Pour utiliser un acide à concentration de 40 à 80%, on ajoute à l'acide concentré  The ideorophosphoric acid can be used as a soluti nsaq.e.s of different caoatraticms. The total amount of acid, counted as undiluted acid, is between 2 and 10 parts by weight. To use an acid concentration of 40 to 80%, it is added to the concentrated acid

0,5 à 6,0 parties en poids d'eau.0.5 to 6.0 parts by weight of water.

Dans le mélange faisant l'objet de l'invention, le composé du type spinelle du magnésium utilisé est un  In the mixture forming the subject of the invention, the magnesium spinel-type compound used is a

produit obtenu par broyage de briques usées de chromite-  product obtained by grinding spent chromite bricks

magnésie ou de magnésie-chromite, provenant de la voûte réfractaire d'appareils d'aciérie et ayant la composition chimique pondérale suivante oxyde de magnésium........... eu. 30 à 94% oxyde de fer (III)........... 2,0 à 40,0% oxyde de fer (II)............... 0,01 à 11,0% oxyde de chrome (III)........... 1,0 à 13,0% oxyde de silicium (IV).......... 2,0 à 8,0% oxyde d'aluminium............... 2,0 à 19,0% oxyde de calcium.............  magnesia or magnesia-chromite, originating from the refractory vault of steelmaking apparatus and having the following chemical weight composition magnesium oxide ......... eu. 30 to 94% iron (III) oxide ........... 2.0 to 40.0% iron oxide (II) ............... 0.01 to 11.0% chromium (III) oxide ............... 1.0 to 13.0% silicon oxide (IV) .......... 2 0 to 8.0% aluminum oxide ............... 2.0 to 19.0% calcium oxide .............

. 0,5 à 8,0% Il est évident que la formation d'une structure du type spinelle de magnésium est tributaire des matériaux de départ utilisés. Lors de la calcination des briques de magnésie-chromite et de chromitemagnésie, il se forme..DTD: une structure de spinelle-périclase.  . 0.5 to 8.0% It is evident that the formation of a magnesium spinel structure is dependent on the starting materials used. During the calcination of magnesia-chromite bricks and chromitemagnesia, DTD is formed: a spinel-periclase structure.

Il est avantageux d'utiliser un mélange contenant un produit obtenu en séparant au préalable des briques usées leur partie active se trouvant du côté du laboratoire de l'appareil d'aciérie et en la broyant, ladite partie active ayant par exemple la composition chimique pondérale suivante oxyde de magnésium..........o*o70,26% oxyde de fer (III). .. 7, 51% oxyde de fer (II)... 1,96% oxyde de chrome (III)..8,98% oxyde de silicium (IV)...... 6,78% oxyde d'aluminium.,............. 3,4% oxyde de calcium................ 1,0% pertes pendant la calcination.. 0,11% Dans ce dernier cas, dans la composition en phases du matériau, la part des composés ferro-magnésiens du type wustite ou fer magnésifère est accrue, tandis que celle du périclase est abaissée, et la composition chimique est caractérisé par une quantité accrue d'oxyde de fer et une quantité abaissée d'oxyde de mangésium comparativement à la composition des poudres obtenues en broyant toute la  It is advantageous to use a mixture containing a product obtained by first separating spent bricks from their active part located on the laboratory side of the steelmaking apparatus and by grinding it, said active part having, for example, the chemical weight composition. following magnesium oxide .......... o * o70,26% iron oxide (III). .. 7, 51% iron oxide (II) ... 1.96% chromium (III) oxide .. 8.98% silicon oxide (IV) ...... 6.78% oxide of iron aluminum., ............. 3,4% calcium oxide ................ 1,0% losses during calcination .. 0 In this last case, in the phase composition of the material, the part of the ferro-magnesian compounds of the wustite or magnesium iron type is increased, while that of the periclase is lowered, and the chemical composition is characterized by an increased quantity. of iron oxide and a reduced amount of manganese oxide compared to the composition of the powders obtained by grinding the entire

masse de briques.mass of bricks.

Le broyage des briques s'effectue à l'aide du matériel  The bricks are crushed using the material

standard employé d'ordinaire dans la préparation des maté-  standard used in the preparation of materials

riaux en poudre, broyeurs à boulets, à jets, vibrants et autres. La surface spécifique du produit obtenu à l'issue du broyage des briques usées se situe entre 500 et 5000  powder mills, ball mills, jet mills, vibratory mills and others. The specific surface of the product obtained after the grinding of used bricks is between 500 and 5000

cm2/g, de préférence entre 1200 et 3000 cm2/g, la détermi-  cm 2 / g, preferably between 1200 and 3000 cm 2 / g, the determination of

natbn s'effectuant par la méthode Kozeni-Karmann. Le tableau ci-après donne les compositions et les propriétés du mélange conforme à l'invention, comparées à celles du mélange connu faisant l'objet du certificat d'auteur  natbn taking place by the Kozeni-Karmann method. The table below gives the compositions and the properties of the mixture according to the invention, compared with those of the known mixture which is the subject of the author's certificate.

URSS n 605 364.USSR 605,364.

I. Composition des mélanges Désignation des constituants Sable quartzeux  I. Composition of mixtures Designation of constituents Quartz sand

Acide orthophosphori-Orthophosphoric acid

que Eauthat Water

Brique de magnésie-Brick of magnesia-

chromite, partie activechromite, active part

Brique de magnésie-Brick of magnesia-

chromite Magnésie-chromite Teneur en constituants, parties en poids mélange conforme mélange connu à l'invention (certif. d'auteu n 605 364 Ir métallurgique - - 10 II. Propriétés des mélanges  Chromite Magnesite-chromite Content of constituents, parts by weight Mixture according to the mixture known to the invention (Certif. No. 605 364 Ir metallurgical - II.

I 2 3 4I 2 3 4

Résistance à la com-Resistance to the com-

pression, kg/cm2: à l'issue de 0,5 h à l'issue de 1 h à l'issue de 4 h 9, 5 12,5 16,5 6,2 17,3 22,5 2,5 13,0 16,5  pressure, kg / cm2: after 0.5 hours after 1 hour after 4 hours 9, 5 12.5 16.5 6.2 17.3 22.5 2.5 13.0 16.5

2 4615382 461538

II. propriétés des mélanges (suite)  II. properties of the mixtures (continued)

1 2 3 41 2 3 4

à l'issue de 24 h 19,0 27,0 22,0 Effrittement, %: à l'issue de 24 h 0,1 0, 1 0,4 Durée d'utilisation mn 15 16 5 à 6  at the end of 24 h 19.0 27.0 22.0 Clear,%: after 24 h 0.1 0, 1 0.4 Operating time min 15 16 5 to 6

Le tableau fait apparattre que la résistance mécani-  The table shows that the mechanical resistance

que des mélanges est supérieure à la celle du mélange connu, tant dans la période initiale qu'au stade final du durcissement. Il est à noter que les mélanges conformes à l'invention conservent leurs hautes propriétés de résistan- ce mécanique même quand les teneurs en constituants sont minimales, et que quand ces teneurs sont maximales, la résistance mécanique des mélanges est supérieure à celle du mélange connu à toutes les étapes de durcissement. De plus l'effritement du mélange s'abaisse notablement. On peut faire varier la durée d'utilisation du mélange faisant l'objet de l'invention entre 9-10 et 20 mn, par modification de la composition dans les limites indiquées. Comparativement au mélange connu, la vitesse de durcissement du mélange conforme à l'invention, caractérisée par sa résistance mécanique 0,5 h après sa préparation, est bien plus élevée, la durée d'utilisation restant en même temps suffisante pour l'exécution de l'ensemble des opérations de fabrication des moules et des noyaux. D'autre part, de pair avec la grande vitesse de durcissement à l'étape initiale, la résistance mécanique continue à croître dans les périodes suivantes et, au bout de 24h, elle atteint des valeurs élevées, alors que les mélanges connues ont une vitesse de durcissement relativement faible et une résistance mécanique peu élevée à l'issue de 24 h. Pour mieux fixer les idées, plusieurs exemples concrets mais non limitatifs de réalisation de l'invention sont  that mixtures are greater than that of the known mixture, both in the initial period and in the final stage of hardening. It should be noted that the mixtures according to the invention retain their high mechanical strength properties even when the contents of constituents are minimal, and that when these contents are maximum, the mechanical strength of the mixtures is greater than that of the known mixture. at all stages of hardening. Moreover the crumbling of the mixture decreases significantly. The duration of use of the mixture which is the subject of the invention can be varied between 9-10 and 20 minutes, by modifying the composition within the limits indicated. Compared to the known mixture, the curing rate of the mixture according to the invention, characterized by its mechanical strength 0.5 h after its preparation, is much higher, the duration of use remaining at the same time sufficient for the performance of all manufacturing operations of molds and cores. On the other hand, together with the high curing speed at the initial stage, the mechanical strength continues to increase in the following periods and, after 24 hours, it reaches high values, while the known mixtures have a speed relatively low curing and low mechanical strength after 24 hours. To better fix the ideas, several concrete but non-limiting examples of embodiment of the invention are

décrits ci-après.described below.

2 46 15382 46 1538

Exemple 1.Example 1

On mélange 81 parties en poids de sable quartzeux avec 10 parties en poidscè produit obtenu par broyage (surface spécifique de 1900 à 2100 cm2/g) de la partie active, séparée au préalable, de briques usées de magnésie-chromite. On brasse le mélange pendant 1 à 2  81 parts by weight of quartz sand are mixed with 10 parts by weight of the product obtained by grinding (specific surface area 1900 to 2100 cm.sup.2 / g) of the active part, separated beforehand, of used magnesia-chromite bricks. Stir the mixture for 1 to 2

mn, puis on lui ajoute 5parties en poids d'acide ortho-  mn, then 5 parts by weight of orthoacid

phosphorique d'une densité de 1,58 à 1,60 g/cm3 et 3 parties en poids d'eau. On brasse de nouveau le mélange pendant 1 à 2 mn. Avec le mélange obtenu on confectionne des éprouvettes pour la détermination de la résistance à la compression, se présentant sous la forme des  phosphoric material with a density of 1.58 to 1.60 g / cm3 and 3 parts by weight of water. The mixture is stirred again for 1 to 2 minutes. With the obtained mixture, specimens for the determination of the compressive strength are prepared in the form of

cylindres de 50 mm de diamètre et de 50 mm de hauteur.  cylinders 50 mm in diameter and 50 mm in height.

La résistance à la compression est déterminée par la  The compressive strength is determined by the

méthode normalisée.standardized method.

Le mélange obtenu a les propriétés suivantes Résistance à la compression, kg/cm2 à l'issue de 0,5 h............ 9,5 à l'issue de 1 h... 19,5 à l'issue de 4 h.... 26,0 à l'issue de 24 h.... 30,0 Durée d'utilisation....  The resulting mixture has the following properties Compressive strength, kg / cm2 at the end of 0.5 h ............ 9.5 at the end of 1 hr ... 19 , After 4 hours .... 26.0 after 24 hours .... 30.0 Duration of use ....

............. 15mn Effritement à l'issue de 24 h...0 ,1% Exemple 2 On prépare le mélange de la même manière que dans l'exemple 1. On mélange 95, 5 parties en poids de sable quartzeux, 2 parties en poids de produit obtenu par broyage de la partie active de briques de magnésie-chromite ayant la même surface spécifique que dans l'exemple 1, 2 parties en poid d'acide orthophosphorique (densité de 1,58 à 1,60 g/cm3) et 0,5 partie en poids d'eau. Le mélange obtenu a les propriétés suivantes: Résistance à la compression, kg/cm à l'issue de 0,5h.... 6,0 à l'issue de 1 h..12,5 à l'issue de 4 h............16,5 à l'issue de 24 h.......... 19,0 durée d'utilisation......... 18 mn - Effritement à-l'issue de 24h 0,15%..DTD: Exemple 3  ............. 15mn Crumbling at the end of 24 hours ... 0, 1% Example 2 The mixture is prepared in the same manner as in Example 1. 5 parts by weight of quartz sand, 2 parts by weight of product obtained by grinding the active part of magnesia-chromite bricks having the same specific surface area as in Example 1, 2 parts by weight of orthophosphoric acid (density of 1.58 to 1.60 g / cm 3) and 0.5 parts by weight of water. The resulting mixture has the following properties: Compressive strength, kg / cm at the end of 0.5 h .... 6.0 at the end of 1 h.12.5 at the end of 4 h ............ 16,5 at the end of 24 hours .......... 19,0 duration of use ......... 18 mn - Crumbling at the end of 24h 0.15%. DTD: Example 3

On prépare le mélange de la même manière que dans l'exemple 1. On mélange 64 parties en poids de sable quartzeux, 10 parties en poids d'acide orthophosphorique (densité de 1,58 à 1,60 g/cm3), 5 parties en poids d'eau et 20 parties en poids de produit obtenu par broyage de la partie active de briques de magnésie-chromite, analogue  The mixture is prepared in the same manner as in Example 1. 64 parts by weight of quartz sand, 10 parts by weight of orthophosphoric acid (density of 1.58 to 1.60 g / cm 3), 5 parts are mixed. by weight of water and 20 parts by weight of product obtained by grinding the active part of bricks of magnesia-chromite, analogous

à celui de l'exemple 1.to that of Example 1.

Le mélange obtenu a les propriétés suivantes: Résistance-à la compression, kg/cm2: à l'issue de 0,5 h.......... 12 à l'issue de I h........... 24,5 à l'issue de 4 h...... 32,0 à l'issue de 24 h....... 43,0 Durée de l'utilisation........... 12 mn Effritement à l'issue de 24 h...... 0,1%  The resulting mixture has the following properties: Resistance-to compression, kg / cm2: at the end of 0.5 h .......... 12 at the end of I h ..... ...... 24.5 at the end of 4 h ...... 32.0 at the end of 24 h ....... 43.0 Duration of use ... ........ 12 mn Cracking after 24 h ...... 0.1%

Exemple 4Example 4

On prépare le mélange de la même manière que dans l'exemple 1. On mélange 81 parties en poids de sable quartzeux, 10 parties en poids de produit obtenu par broyage de briques usées de magnésie-chromite (surface spécifique de 1900 à 2100 cm2/g), 6 parties en poids d'acide orthophosphorique (densité de 1,58 à 1,60 g/cm3)  The mixture is prepared in the same manner as in Example 1. 81 parts by weight of quartz sand are mixed, 10 parts by weight of product obtained by grinding magnesium-chromite spent bricks (specific surface area 1900 to 2100 cm 2 / g), 6 parts by weight of orthophosphoric acid (density of 1.58 to 1.60 g / cm3)

et 3 parties en poids d'eau.and 3 parts by weight of water.

Le mélange obtenu a les propriétés suivantes: résistance à la compression, kg/cm2 àl'issue de 0,5 h....... 6,2 àl'issue de 1 h......17,3 à l'issue de 4 h..........22,5 à l'issue de 24 h..........27,0 Durée d'utilisation..  The resulting mixture has the following properties: compressive strength, kg / cm 2 at the end of 0.5 h ....... 6.2 at the end of 1 h ...... 17.3 at the end of 4 hours .......... 22.5 after 24 hours .......... 27.0 Duration of use ..

............16 mn Effritement à l'issue de 24 h.......0,1%..DTD: Exemple 5  ............ 16 min Cracking after 24 h ....... 0.1% .. DTD: Example 5

On prépare le mélange de la même manière que dans  The mixture is prepared in the same way as in

l'exemple 1oexample 1o

On mélange 86,25 parties en poids de sable quartzeux 10 parties en poids de produits obtenu par broyage de la  86.25 parts by weight of quartz sand 10 parts by weight of products obtained by grinding of the

partie active de briques usées de magnésie-chromite (sur-  active part of used magnesia-chromite bricks

face spécifique de 1900 à 2100 cm2/g), 3 parties en poids d'acide orthophosphorique (densité de 1,58 à 1,60 g/cm3  specific surface of 1900 to 2100 cm2 / g), 3 parts by weight of orthophosphoric acid (density of 1.58 to 1.60 g / cm3

et 0,75 partie en poids d'eau.and 0.75 parts by weight of water.

Le mélange obtenu a les propriétés suivantes Résistance à la compression, kg/cm2 à l'issue de 0,5 h....o.......0 14 à l'issue de 24 h.............. 21 Durée d'utilisation...................9 10 mn  The resulting mixture has the following properties Compressive strength, kg / cm2 at the end of 0.5 h .... o ....... 0 14 at the end of 24 h ..... ......... 21 Duration of use ................... 9 10 mn

Exemple 6Example 6

On prépare le mélange de la même manière que dans  The mixture is prepared in the same way as in

l'exemple lothe example lo

On mélange 81 parties en poids de sable quartzeux, 10 parties en poids de produit obtenu par broyage de la partie active de briques de magnésiechromite, analogue  81 parts by weight of quartz sand are mixed with 10 parts by weight of product obtained by grinding the active part of magnesium bromide bricks, analogous

à celui de l'exemple 5, 6 parties en poids d'acide ortho-  to that of Example 5, 6 parts by weight of orthoacidic acid

phosphorique (densité de 1,58 à 1,60 g/cm3) et 3 parties  phosphoric acid (density of 1.58 to 1.60 g / cm3) and 3 parts

en poids d'eau.by weight of water.

Le mélange obtenu a les propriétés suivantes Résistance à la compression, kg/cm2y à l'issue de 0,5 h............ 9,5 ò l'issue de 24 h........0...0. 30,0 Durée d'utilisation.................. 15 mn  The resulting mixture has the following properties Resistance to compression, kg / cm2y at the end of 0.5 h ............ 9.5 at the end of 24 h .... .... 0 ... 0. 30.0 Duration of use .................. 15 mn

Exemple 7Example 7

On prépare le mélange de la même manière que dans  The mixture is prepared in the same way as in

l'exemple 1.Example 1

On mélange 75,5 parties en poids de sable quartzeux 10 parties en poids de produit obtenu par broyage de la partie active de briques de magnésiechromite, analogue  75.5 parts by weight of quartz sand 10 parts by weight of product obtained by grinding the active part of magnesium bromide bricks, analogous

à celui de l'exemple 5,9 parties en poids d'acide ortho-  5.9 parts by weight of orthoacidic acid are

phosphorique (densité de 1,58 à 1,60 g/cm3) et 5,5 parties  phosphoric acid (density of 1.58 to 1.60 g / cm3) and 5.5 parts

246 1538246 1538

en poids d'eau.by weight of water.

Le mélange obtenu a les propriétés suivantes Résistance à la compression, kg/cm2: à l'issue de 0,5 h..vooeoo.ooo 7,6 à l'issue de 24 h...Oo......... 38 Durée d'utilisation.................... 20 mn  The resulting mixture has the following properties Compressive strength, kg / cm2: at the end of 0.5 h..vooeoo.ooo 7.6 at the end of 24 h ... Oo ...... ... 38 Duration of use .................... 20 mn

Exemple 8Example 8

On prépare le mélange de la même manière que dans  The mixture is prepared in the same way as in

l'exemple 1.Example 1

On mélange 81 parties en poids de sable quartzeux (grosseur moyenne des grains de 0,16 à 0,20 mm), 10 parties en poids de produit obtenu par broyage de briques usées de chromite-magnésie, 6 parties en poids d'acide orthophophorique (densité de 1,58 à 1,60 g/cmn) et 3  81 parts by weight of quartz sand (average grain size of 0.16 to 0.20 mm), 10 parts by weight of product obtained by grinding of spent chromite-magnesia bricks, 6 parts by weight of orthophophoric acid are mixed. (density of 1.58 to 1.60 g / cmn) and 3

parties en poids d'eau.parts by weight of water.

Le mélange obtenu a les propriétés suivantes: Résistance à la compression; kg/cm2: à l'issue de 0,5 h.... 6,0 à l'issue de 1 h.............. 15,5 à l'issue de 4 h. 20,0 à l'issue de 24 h.............. 25,5 Durée d'utilisation b 15 mn Effritement à l'issue de 24 h.......... 0,15% Bien entendu, l'invention n'est nullement limitée aux modes de réalisation décrits et représenta qui n'ont été donnés qu'à titre d'exemple. En particulier, elle  The resulting mixture has the following properties: Compressive strength; kg / cm2: at the end of 0.5 h .... 6.0 at the end of 1 h .............. 15.5 at the end of 4 h. 20.0 at the end of 24 hours .............. 25.5 Duration of use b 15 mn Crumbling at the end of 24 hours ........ .. 0.15% Of course, the invention is not limited to the embodiments described and represents that have been given as an example. In particular, she

comprend tous les moyens constituant des équivalents techni-  includes all means constituting technical equivalents

ques des moyens décrits, ainsi que leurs combinaisons, si celles-ci sont exécutées suivant son esprit et mises  the means described, as well as their combinations, if they are carried out according to his spirit and

en oeuvre dans le cadre de la protection comme revendiquée.  implemented in the context of protection as claimed.

1 11 1

R E V E N D I C AT I 0 N SR E V E N D I C AT I 0 N S

lo Mélange autodurcissant pour la fabrication de moules et de noyaux de fonderie du type comprenant une charge réfractaire, de l'acide orthophosphorique, un matériau à base de magnésie cuite à mort, et de l'eau, caractérisé en ce que le matériau à base de magnésie cuite à mort est un composé du type spinelle de magnésium, calciné à une températue de 1600 à 1900 C pendant 40 à 1600 h, 2. Mélange autodurcissant suivant la revendication 1, caractérisé en ce qu'il contient (parties en poids): acide orthophcsphorique.....000.. 2 à 10 composé du type spinelle de magnésium...............Èc..o 2 à 20 eau oooOO..oo..o.....o..O 0,5 à 5,0 charge réfractaire...0000.... le solde  lo Self-hardening mixture for the manufacture of molds and foundry cores of the type comprising a refractory filler, orthophosphoric acid, a dead-burnt magnesia material, and water, characterized in that the material based on burned magnesia is a magnesium spinel compound, calcined at a temperature of 1600 to 1900 C for 40 to 1600 h, 2. Self-hardening mixture according to claim 1, characterized in that it contains (parts by weight) : orthophosphoric acid ..... 000 .. 2 to 10 composed of magnesium spinel type ............... Èc..o 2 to 20 water ooooo..oo..o ..... o..O 0.5 to 5.0 refractory charge ... 0000 .... the balance

3o Mélange autodurcissant selon l'une des revendica-  3o self-hardening mixture according to one of the claims

tions 1 et 2, caractérisé en ce que le composé du type spinelle de magnésium entrant dans sa composition est un  1 and 2, characterized in that the magnesium spinel type compound used in its composition is a

produit obtenu par broyage de briques usées de magnésie-  product obtained by grinding used magnesia bricks

chromite provenant du garnissage réfractaire d'appareils d'aciérie.  chromite from the refractory lining of steelmaking equipment.

4. Mélange autodurcissant selon l'une des revendi-  4. Self-hardening mixture according to one of the

cations 1, 2 et 3, caractérisé en ce que le compose du type spinelle de magnésium entrant dans sa composition est un produit obtenu par broyage de la partie active,  cations 1, 2 and 3, characterized in that the magnesium spinel type compound used in its composition is a product obtained by grinding the active part,

séparée au préalable, desdites briques usées de magnésie-  previously separated from said used magnesia bricks

chromite.chromite.

FR8015953A 1979-07-19 1980-07-18 SELF-CURING MIXTURE FOR THE MANUFACTURE OF FOUNDRY MOLDS AND CORES Granted FR2461538A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SU792783403A SU942858A1 (en) 1979-07-19 1979-07-19 Self-hardenable mixture for producing casting moulds and cores

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FR2461538A1 true FR2461538A1 (en) 1981-02-06
FR2461538B1 FR2461538B1 (en) 1983-04-29

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* Cited by examiner, † Cited by third party
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GB2070627B (en) 1983-04-20
IT8023562A0 (en) 1980-07-18
GB2070627A (en) 1981-09-09
FR2461538B1 (en) 1983-04-29
SU942858A1 (en) 1982-07-15
SE8101093L (en) 1981-02-18
IT1150000B (en) 1986-12-10
DE3049730C1 (en) 1984-05-03
SE423190B (en) 1982-04-26
WO1981000224A1 (en) 1981-02-05

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