CA1203818A - Calcium aluminate based cement, and its manufacture - Google Patents

Abstract

A calcium aluminate powder is mixed with water and with a powder or granule of a product insoluble in water, but melting between 700 and 1400.degree.C and silica of any particle size. The mixture, once hardened, is heated between 700 ent 1400.degree.C. The product obtained has increased hardness, cohesion and impermeability compared to calcium aluminate without addition. The product obtained is different in its appearance, its formula, its crystallization and its properties compared to calcium aluminate.

Description

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The present invention relates to a product obtained from some calcium.
The aluminate of ~ ~ lcil ~ gives, with water of ~ h ~ o ~
a hard but non-cohesive mass and F ~ rm ~ hle / because, p ~ r drying, there are pores that l ~ iq ~ s ~ nt water droplets ~ lo ~ q in the mass and evaporated.
This is the purpose ~ Pn ~ ral of the present invention of ~ l ~ -L ~ L
hardness, coh ~ i ~ n, 1'1r ~ er ~ hility and the appearance of cement has base of ~ min ~ te of ~ Al ~ m ~ and to obtain a product which is refrac-shut up and that allows a mpil ~ ellr ~ mRi ~ age. According to the invention, onmixing in the dry state a powder of ~ ll ~; n ~ calcium te with a powder or granulate of a product; n ~ lllhle in water and melting between . 700 and 1400C and, preferably, silica of any kind ~ nlll ~ n ~ sort.
The oh adds the mixing water and the ~ l ~ nge is allowed to harden ~
room temperature. Then the mass, once hardened, is es1 cooked at a ~ eL ~ Lul ~ between 700 and 1400 &. The product: ~ nqo ~ llhle in the water serves as the background ~ nt.
Uncured mPl ~ n ~ e is placed in molds to obtain blocks in the form of plates or any other form. The blocks, once hardened and before c ~ n, can be covered with email which spreads very evenly ~ "~ l ~ lL during cooking.
tion of the product jncnlllhle in water by L ~ JLL with the mixture the dry state can vary between 20 ~ and 80% by weight. The ~ L ~ LLion silica, Fa ~ - Ld ~ L ~ in the dry state mixture ~ may vary -between 0% and 60 ~ by weight. The gr ~ n ~ mPtrie of 1 ~ powder ~ e ~ of alu- -. .
m calcium and product mate; nsolllhle in water can vary between 200 and 6 mesh.
Alum ~ calcium nate has a relative content of ~ l ~ 03 varying between 70 ~; and 40 ~ by weight and a relative content e ~ n CaO

varying between 29% early 38% by weight.
The product; n ~ olllh1e in water and flux is chosen among:

.,, -. , ~.,. ..... ~ ~.

~ 203 ~ 3 ~ 8 1) rocks

2) silicates

3) any product ~ h; m; ~ l ~ giving the same results

4) a mixture of the products mentioned under 1), 2) or 3).
Xoches are p ~ Lu ~ L rocks, hi ~ lPs, such as ~
albite, nPph ~ l; nP, syenite, leucite, orthosis, mic ~ ocline ~ pa ~ io-class, analcime, natrolite, Si02, anorthosis, wollastoni ~ e, amphi-bole, oligoclase, andesite, lAhrA ~ lnrite and all the rocks of the family of silicates, such as porphyries and porph ~ res arti-official.
Among the silicates, the em emplies the insoluble silicates bles in water and melt at high temperature, such as silicate calcium ....; silicates ~ hle ~ of one Quelcc ~ que des ~ n ~ fmhl following:
a) sodium, potA. ~ calcium b) sodium, calcium '~) pO1-A f ~ GA 1 G; 1 lm d) sodium, calcium, plc oxide ~ b e) po ~ s. ~ i-lm, cAlrilrnt c ~ yde de plc ~ nb f) pot ~ l ~, sodium, ~ alkium, ~ plc xyde ~ b and all silicates m ~ nlllhl ~ s and melting at high ~ temperature.
As a source of silicates, powdered glass can be used OR grAnlll e lx. . , ~. ~, .. ..
Among the products ~ h; mi ~ lP ~, 11 we use the ~ ~ te lithium, mAn silicate ~ nasp ~ plca silicate ~ b, others lead salts, sodium fluoride, cryolite and any other pro-chemical product melting in a mass; n. ~ olnhlel hard and stA ~ ble ~

Here are some ~ x ~ rl ~. ~ Of mixtures, in the dry state "which give a finished product with the desired properties:
in weight 10% silica blend mi ~ te key CA 1 ~ m 35%

powdered glass or gr ~ mllell ~ 55 ~
100 ~, .

~ 2038 ~ 8 ., in polda Mix B ~ ilice 10%
calcium aluminate 30%
powdered or gritty glass 60Z.
100%
Mixture C silica ~ 20%
pyromorphic rocks ~ 30%
calclum aluminate 30%
~ double ilicate 20%
100%
Silica mixture, 20%
calcium aluminate 40%
nepheline, ayenite 4 ~ /, 100%
Mixture E silica 15%
calcium aluminate 25%
double silicates - 50%
sodium fluoride lOZo 100%
Mixture of calcium aluminate 30%
rock ~ pyromorphic. 60%
double sillcates 3 ~ 10%
100%
~ a colorant is added to the ~ mixture) G silica blend 20%
al ~ minate of calcium 25%
albite, 20%
nepheline 20%
sodium iluoride 5 ~ / O
5% lithium silicon 5% cryolite 100%

~ 2 ~ 38 ~ 3 The product obtained can be aoua ~ block elm, brlqu ~, of plate or any other form and can be é ~ illé in toutea couleura or colored in the maase; this is how we can produce dea molding ~ in bas-rellefs, dea lavaboa, dea bainoirea, ~ tc.

:.

Claims (23)

THE ACHIEVEMENTS OF THE INVENTION ABOUT WHICH A RIGHT
EXCLUSIVE OF OWNERSHIP OR PRIVILEGE IS CLAIMED, ARE
DEFINED AS FOLLOWS:

l. A cement block with improved properties, no-especially as regards its hardness, its cohesion, its impermeability and its refractory nature; said block being obtained at from a mixture in the dry state comprising: aluminum powder calcium minate and a granulated product; mixing water having diluted the said mixture so that the latter hardens to a room temperature so that it is then cooked to a temperature erasure which can vary between seven hundred and one thousand four hundred Centigrade degrees; said granulated product representing between twenty and eighty percent by weight of said mixture to dry state; said granulated product being characterized by its insolubility in water and by a melting temperature varying between seven hundred and one thousand four hundred degrees Centigrade. 2. A cement block as defined in the claim tion 1, wherein said mixture in the dry state further comprises a silica-based agent. 3. Cement block as defined in claim 2, where said silica can constitute up to sixty percent hundred percent by weight of said mixture in the dry state. 4. Cement block as defined in claim 2, where said granulated product is chosen from the group including:
a) pyromorphic rocks; and b) silicates insoluble in water and at a temperature of high cast iron. 5. Cement block as defined in claim 4, where the silicas are powdered or granular glass. 6. Cement block as defined in any one of claims 1, 2 or 3, wherein the particle size of said mixture in the dry state can vary between six and two hundred mesh. 7. Cement block as defined in any one claims 1, 2 or 3, wherein said calcium aluminate has a relative content of aluminum trioxide which can vary between forty and seventy percent by weight, and a relative content tive in calcium monoxide which can vary between twenty-nine and thirty-eight percent. 8. Cement block as defined in claim 4, where said pyromorphic rocks are chosen from the group including albite, nepheline, syenite, leucite, orthosis, microcline, pagioclase, analcime, natrolite, silicon dioxide, anorthose, wollastonite, amphibole, oligoclase, andesite and labradorite. 9. Cement block as defined in any one claims 4 or 8, wherein said silicates insoluble in water are porphyries, including artificial porphyries. 10. Cement block according to any one of the res-dications 4 or 8, where said water-insoluble silicates are calcium silicates. 11. Cement block as defined? claim 8, wherein said ole-insoluble silicates are double silicates chosen from the group of mixtures following:
a) calcium and potassium;
b) calcium and sodium;
c) calcium, potassium and sodium;
d) calcium, lead oxide and sodium;
e) calcium, lead oxide and potassium; and f) calcium, lead oxide, potassium and sodium. 12. Cement block as defined in claim 11, where said granulated product is also chosen from the following products: lithium silicates, manga-lead and lead; sodium fluoride; and the cryolite. 13. Cement block according to any one of claims 8, 11 or 12, the relative content of which by weight is twenty percent silica, calcium aluminate, forty percent and a substance selected from the group including nepheline and syenite, forty percent. 14, Cement block as defined in any one claims 11 or 12, the relative content of which by weight of calcium aluminate is thirty percent, that of thirty percent pyromorphic rocks, that of silicates double twenty percent, and that of silica twenty percent. 15. Cement block as defined in claim 12, of which the relative content by weight of silica is fifteen percent, calcium aluminate, twenty-five percent, double silicates, fifty percent and sodium fluoride, ten percent. 16. Cement block as defined in claim 12, the relative content by weight of silica of which is twenty percent, calcium aluminate, twenty-five percent, albite, twenty percent, nepheline, twenty percent, sodium fluoride, five percent, lithium silicate, five percent and cryolite, five percent. 17. Cement block as defined in the claim tion 5, the relative silica content of which is ten percent by weight, in calcium aluminate of thirty-five percent by weight, and a powdered glass, fifty-five percent in weight. 18. Cement block as defined in claim 5, the relative silica content of which is ten percent by weight, in calcium aluminate, thirty percent by weight and in powdered glass, sixty percent by weight. 19. Cement block as defined in any one claims 11 or 12, the relative aluminate content of which of calcium is thirty percent by weight, in pyromor-phiques, sixty percent by weight and double silicates, ten percent by weight. 20. Cement block as defined in the claims 1, 2 or 5, wherein said dry mixture comprises moreover a coloring agent. 21. Method of manufacturing a block of cement from a mixture in the dry state based on calcium aluminate, a product insoluble in water and melting at a temperature which can vary?
between seven hundred and one thousand four hundred degrees Centigrade; and a silica product; said method comprising the steps following pes:
1) dilute said mixture in the dry state in water mixing, so as to produce a composition;
2) pouring said composition into one or more molds;
3) allow the said composition to completely harden as room temperature; and d) baking said cured composition at a temperature which can vary between seven hundred and one thousand four hundred degrees Centi-grade; said product insoluble in water serving fondant. 22. The manufacturing method as described to claim 21, further comprising a fifth step intermediate in said steps 3 and 4, which consists in covering said cured composition placed in said molds of a enamel, so that it spreads evenly over the entire surface of the cement block during the firing. 23. The tell manufacturing method as described in claim 21, wherein the dry mixing contains a coloring agent.