GB2042499A - Stabilised dead-burned dolomite - Google Patents
Stabilised dead-burned dolomite Download PDFInfo
- Publication number
- GB2042499A GB2042499A GB7906409A GB7906409A GB2042499A GB 2042499 A GB2042499 A GB 2042499A GB 7906409 A GB7906409 A GB 7906409A GB 7906409 A GB7906409 A GB 7906409A GB 2042499 A GB2042499 A GB 2042499A
- Authority
- GB
- United Kingdom
- Prior art keywords
- mixture
- magnesia
- dead
- dolomite
- weight
- 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.)
- Withdrawn
Links
- 239000010459 dolomite Substances 0.000 title claims abstract description 26
- 229910000514 dolomite Inorganic materials 0.000 title claims abstract description 26
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 77
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 39
- 239000000203 mixture Substances 0.000 claims abstract description 36
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 32
- 239000003381 stabilizer Substances 0.000 claims abstract description 17
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 16
- 239000002243 precursor Substances 0.000 claims abstract description 15
- JHLNERQLKQQLRZ-UHFFFAOYSA-N calcium silicate Chemical compound [Ca+2].[Ca+2].[O-][Si]([O-])([O-])[O-] JHLNERQLKQQLRZ-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000003112 inhibitor Substances 0.000 claims abstract description 10
- 239000011819 refractory material Substances 0.000 claims abstract description 10
- 229910052918 calcium silicate Inorganic materials 0.000 claims abstract description 7
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims abstract description 6
- 235000012241 calcium silicate Nutrition 0.000 claims abstract description 6
- HCWCAKKEBCNQJP-UHFFFAOYSA-N magnesium orthosilicate Chemical compound [Mg+2].[Mg+2].[O-][Si]([O-])([O-])[O-] HCWCAKKEBCNQJP-UHFFFAOYSA-N 0.000 claims abstract description 5
- 239000000391 magnesium silicate Substances 0.000 claims abstract description 5
- 235000019792 magnesium silicate Nutrition 0.000 claims abstract description 5
- 229910052919 magnesium silicate Inorganic materials 0.000 claims abstract description 5
- 229910019142 PO4 Inorganic materials 0.000 claims abstract description 4
- 239000010452 phosphate Substances 0.000 claims abstract description 4
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims abstract description 4
- BTBUEUYNUDRHOZ-UHFFFAOYSA-N Borate Chemical compound [O-]B([O-])[O-] BTBUEUYNUDRHOZ-UHFFFAOYSA-N 0.000 claims abstract description 3
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 claims abstract description 3
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical compound [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 claims abstract description 3
- 229910000423 chromium oxide Inorganic materials 0.000 claims abstract description 3
- LBSANEJBGMCTBH-UHFFFAOYSA-N manganate Chemical compound [O-][Mn]([O-])(=O)=O LBSANEJBGMCTBH-UHFFFAOYSA-N 0.000 claims abstract description 3
- 238000000034 method Methods 0.000 claims description 25
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 14
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 14
- 239000004571 lime Substances 0.000 claims description 14
- 239000002245 particle Substances 0.000 claims description 9
- 239000011230 binding agent Substances 0.000 claims description 6
- 235000014380 magnesium carbonate Nutrition 0.000 claims description 6
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 claims description 6
- 239000000347 magnesium hydroxide Substances 0.000 claims description 6
- 229910001862 magnesium hydroxide Inorganic materials 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 6
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 claims description 5
- 239000001095 magnesium carbonate Substances 0.000 claims description 5
- 229910000021 magnesium carbonate Inorganic materials 0.000 claims description 5
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 claims description 4
- 239000004327 boric acid Substances 0.000 claims description 4
- 239000012535 impurity Substances 0.000 claims description 4
- LSNNMFCWUKXFEE-UHFFFAOYSA-L sulfite Chemical group [O-]S([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-L 0.000 claims description 4
- JXLHNMVSKXFWAO-UHFFFAOYSA-N azane;7-fluoro-2,1,3-benzoxadiazole-4-sulfonic acid Chemical compound N.OS(=O)(=O)C1=CC=C(F)C2=NON=C12 JXLHNMVSKXFWAO-UHFFFAOYSA-N 0.000 claims description 2
- 229920005610 lignin Polymers 0.000 claims description 2
- 239000000292 calcium oxide Substances 0.000 abstract description 6
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 abstract description 6
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 abstract description 5
- 239000010450 olivine Substances 0.000 abstract description 5
- 229910052609 olivine Inorganic materials 0.000 abstract description 5
- 238000006243 chemical reaction Methods 0.000 abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 3
- WYTGDNHDOZPMIW-RCBQFDQVSA-N alstonine Natural products C1=CC2=C3C=CC=CC3=NC2=C2N1C[C@H]1[C@H](C)OC=C(C(=O)OC)[C@H]1C2 WYTGDNHDOZPMIW-RCBQFDQVSA-N 0.000 abstract description 2
- 239000000454 talc Substances 0.000 abstract description 2
- 229910052623 talc Inorganic materials 0.000 abstract description 2
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 abstract 1
- 239000000047 product Substances 0.000 description 8
- 238000002156 mixing Methods 0.000 description 7
- 239000008188 pellet Substances 0.000 description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 229910052681 coesite Inorganic materials 0.000 description 3
- 229910052906 cristobalite Inorganic materials 0.000 description 3
- 235000012239 silicon dioxide Nutrition 0.000 description 3
- 239000002893 slag Substances 0.000 description 3
- 229910052682 stishovite Inorganic materials 0.000 description 3
- 229910052905 tridymite Inorganic materials 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000003518 caustics Substances 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- BCAARMUWIRURQS-UHFFFAOYSA-N dicalcium;oxocalcium;silicate Chemical compound [Ca+2].[Ca+2].[Ca]=O.[O-][Si]([O-])([O-])[O-] BCAARMUWIRURQS-UHFFFAOYSA-N 0.000 description 1
- 239000012065 filter cake Substances 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 239000011451 fired brick Substances 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 235000010755 mineral Nutrition 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000005453 pelletization Methods 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 238000005549 size reduction Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 235000019976 tricalcium silicate Nutrition 0.000 description 1
- 229910021534 tricalcium silicate Inorganic materials 0.000 description 1
- 239000011452 unfired brick Substances 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
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
- C04B35/03—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 magnesium oxide, calcium oxide or oxide mixtures derived from dolomite
- C04B35/06—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 magnesium oxide, calcium oxide or oxide mixtures derived from dolomite based on oxide mixtures derived from dolomite
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Treating Waste Gases (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
Abstract
A refractory material is obtained by pelletising and-dead-burning dolomite and optionally magnesium oxide, or a precursor therefor, in the presence of a stabilising agent which is an oxide or precursor therefor which reacts in the dead-burning with the calcium oxide of the calcined dolomite to produce a product less susceptible to reaction with water. Suitable oxides are chromium oxide, zirconia or silica, or a magnesium silicate such as talc, serpentine or olivine. Where the reaction produces dicalcium silicate the mixture should include an inhibitor for the inversion of beta to gamma dicalcium silicate e.g. a chromate, phosphate, manganate or borate.
Description
SPECIFICATION
Stabilised dead-burned dolomite
The present invention relates to refractory materials based on dolomite.
Dolomite is a naturally occurring mineral containing both calcium carbonate and magnesium carbonate.
When this is dead-burned it is useful as a refractory material. However dead-burned dolomite has serious shortcomings as a refractory material since it has a low resistance to chemical attack by metallurgical slags and the calcium oxide component has a marked tendency to hydrate thereby seriously degrading the refractory properties of the dead-burned dolomite.
It has now been found that if dolomite is stabilised in a particular way and optionally appropriately treated with magnesia its refractory properties are much improved.
Accordingly the present invention provides a method for preparing a dead-burned refractory material which method comprises pelletising a mixture containing dolomite and a stabilising agent (as hereinafter defined), and optionally magnesia or a magnesia precursor, and dead-burning the pelletised mixture.
A "stabilizing agent" in this specification means on oxide, or a material which forms an oxide on dead-burning in admixture with dolomite, which reacts in the dead-burning with the calcium oxide produced from the dolomite and thereby decreases reactivity of the dead-burned product with water, provided that where the said reaction produces dicalcium silicate, the mixture also includes an inhibitor for the inversion of beta dicalcium silicate to gamma dicalcium silicate upon cooling.
"Stabilised calcium oxide" as used in this specification, means the reaction product of calcium oxide and a stabilising agent as defined above. Suitable stabilising agents include zirconia, chromium oxide, silica or a magnesium silicate such as talc, serpentine or olivine. In the case of silica-containing stabilising agents, the lime component is converted into di- and/or tricalcium silicate (2CaO, SiO2 and 3CaO, SiO2). Effectively therefore the amount of silica-type stabilising agent which should be added is preferably such that the weight ratio of lime to silica in the mixture after dead-burning is in the range 1.87 to 2.95, preferably in the range 2.55 to 2.75.
The purpose of the inhibitor included in certain of the stabilising agents is to inhibit the inversion of beta dicalcium silicate to gamma dicalcium silicate during cooling of the dead-burnt pelletised mixture. Suitable inhibitors include compounds which provide ions such as chromate, phosphate, manganate and borate.
Preferably boric acid is used. Since inhibitors such as boric acid adversely affect refractory properties it is obviously desirable to use the minimum quantity which is effective.
In order to obtain strong pellets during the pelletisation step and to minimise pellet breakdown during firing, the mixture preferably also contains a carbonisable binding agent such as sulphite lye or other lignin sulphonate. The quantity of binding agent is desirably in the range 0.1% to 5% by weight based on the weight of the mixture for example in the range 0.25% to 2% by weight.
The magnesia when used in the present invention may be caustic or active magnesia (i.e. lightly calcined) or dead-burned magnesia. The magnesia precursor may be magnesium carbonate, natural magnesite or magnesium hydroxide. In all these cases the silica content of the magnesia or the magnesia precursor, which may be significant in relation to natural magnesites, will have to be taken into account in calculating the amount of stabilising agent, including inhibitor, required.
The dolomite and optionally the magnesia or magnesia precursor are preferably used in such proportions in the mixture that the amount of MgO in the product is 40% to 90% desirably 55% or even 60% to 85% by weight based on the weight of the dead-burned product. The proportion of lime component of the dolomite to magnesia is therefore preferably approximately in the range 60:40 to 10:90 by weight. It is thought that the provision of magnesia or a precursor therefor in the mixture increases the resistance of the product to attack by metallic slags.
The mixture may be formed by merely blending together in a suitable mixer the various ingredients of the mixture. However it is preferred to form the mixture in an apparatus which combines the functions of mixing and size reducing.
Desirably the mixing should be intimate, so as to produce a substantially uniform distribution of particles of dolomite and particles of magnesia or magnesia precursor.
The dolomite and the stabilising agent are preferably first intimately mixed dry by any means which involves size reduction while mixing although this does not mean that the materials to be mixed cannot be in an already finely divided condition. In general, tumbling mills are very suitable such mills including ball, pebble, rod, tube and compartment mills.
It has been found that the particle size of the components of the blend after mixing is an important feature in ensuring that, after dead burning, a product is obtained having a microstructure in which lime-containing grains are surrounded by grains of magnesia. After mixing, the size range should preferably be such that 100% passes through a 72 BS sieve, preferably 100% passes through a 100 BS mesh sieve.
Preferably the other components of the mixture are incorporated after mixing the dolomite and the stabilising agent. Preferably the magnesium hydroxide is added as filter cake containing 5% to 45% by weight of water.
It is preferred to use magnesia or magnesia precursor the impurity content of which, discounting lime, is a minimum, for example which is less than 6% by weight preferably less than 2.5% by weight. Typical impurities in magnesia are silica, iron, alumina, manganese and boron.
The pelletising of the ground mixture may be carried out in a mechanical or hydraulic press or pelletising apparatus to form shapes or pieces, for example, cubes, prisms, ovoids, or cylinders having e.g. diameters of the order of 0.25 to 1.25 inches. The pressure employed must be sufficient to enable the pressed material to pass through the subsequent dead-burning process without appreciable breakdown. A minimum pressure of 5 tons per square inch is necessary to obtain a low porosity in the final product. Pressures in the range 1 to 40 tons per square inch may be employed but it is preferred of from 15 to 40 tons per square inch. A wet mixture may be extruded.
The dead-burning of the pressed mixture may be carried out for example in a rotary kiln, a travelling grate kiln or a shaft kiln. The dead-burning temperature may be in the range 1350"C to 2000"C but is preferably in the range 1400into 1900"C.
It is to be understood that the present invention also includes a dead-burned refractory material whenever prepared by the process as hereinbefore described.
The appropriate treatment of dolomite in the preferred manner described above results in an improved refractory material the improvement in which it is believed can be attributed to the fact that the original lime component of the dolomite is converted completely into non-hydratable calcium silicates the particles of which are further to a great extent enveloped in a coating of magnesia. The present invention includes a refractory dead-burned material having a micro-structure in which particles of stabilised lime (as herein defined) are at least partially enveloped in or coated with magnesia.
The preferred products of the present invention are hydration resistant materials which are densified easily, are resistant to iron-containing slags and find application for a wide variety of refractory purposes such as fired or unfired bricks, and in slinging, gunning, ramming, casting and moulding mixes.
The following Examples in which parts and percentages are by weight is given to illustrate the present invention.
Example 1
62.6 parts of raw dolomite, 16.7 parts of olivine, 74 parts of magnesium hydroxide, 0.15 parts of boric acid and 1.5 parts of dry sulphite lye were fed to a ball mill and co-milled to -200 BS mesh.
The dolomite, olivine and magnesium hydroxide analysed as follows:
SiO2 Fe2O3 Al203 CaO MgO Ign loss
Dolomite 0.40 0.43 0.15 30.70 21.74 46.59
Olivine 41.55 7.86 0.80 0.38 .46.89 1.77
Magnesium
Hydroxide 0.60 1.30 0.40 1.00 96.7
The blend obtained by the milling step was pressed by means of a Komarek-Greaves double roll press at 20 tons per square inch into pellets about an inch in width. These pellets were fired in a rotary kiln designed to hold the pellets at 1800"C for 3 hours.
The sintered pellets had a lime/silica ratio of 2.6 and a magnesia content of 70%. A study of the microstructure showed it to be made up of grains of lime surrounded by grains of magnesia. The pellets showed no signs of deterioration by the action of moisture upon storage for 6 weeks.
Example 2
The procedure of Example 1 was repeated using the following mixture:
67 parts Dolimite
11 parts Silica - stabilising agent
0.12 parts Calsium Phosphate - inhibitor
0.15 parts Sulphite lye - binder
After calcination, the microstructure of the product and its stability to storage was found to be similar to the product of Example 1.
Claims (20)
1. A method for preparing a dead-burned refractory material which method comprises pelletising a mixture containing dolomite and a stabilising agent (as hereinbefore defined), and optionally magnesia or a magnesia precursor, and dead-burning the pelletised mixture.
2. A method as claimed in claim 1 wherein the mixture contains dolomite and optionally magnesia or precursor therefor which is present in the mixture in an amount such that the amount of MgO in the product is from 40 to 95% by weight.
3. A method as claimed in claim 2 wherein the mixture contains dolomite and optionally magnesia or precursor therefor which is present in the mixture in an amount such that the amount of MgO in the product is from 60 to 85% by weight.
4. A method as claimed in claim 1 wherein the mixture contains magnesia, magnesium carbonate, natural magnesite, or magnesium hydroxide.
5. A method as claimed in any one of claims 1 to 4 wherein the mixture contains magnesia or a precursor therefor and the impurity content of the magnesia or magnesia precursor, discounting lime, is less than 6% by weight.
6. A method as claimed in any one of claims 1 to 5 wherein the impurity content of the magnesia or magnesia precursor, discounting lime, is less than 2.5% by weight.
7. A method as claimed in any preceding claim wherein the stabilising agent is zirconia or chromium oxide or silica or a magnesium silicate used with an inhibitor for the inversion of beta dicalcium silicate to gamma-dicalcium silicate.
8. A method as claimed in claim 7 wherein an amount of silica or a magnesium silicate is present in the mixture such as to provide a weight ratio of lime to silica in the range of from 1.87:1 to 2.95:1.
9. A method as claimed in claim 8 wherein an amount of silica or a magnesium silicate is present in the mixture such as to provide a weight ratio of lime to silica in the range of from 2.55:1 to 2.75:1.
10. A method as claimed in any preceding claim wherein the stabilising agent includes an inhibitor for the inversion of beta-dicalcium silicate to gamma dicalcium silicate which is a chromate, phosphate, manganate or borate.
11. A method as claimed in any one of claims 1 to 9 wherein the stabilising agent includes an inhibitor for the inversion of beta-dicalcium silicate to gamma dicalcium silicate which is a boric acid.
12. A method as claimed in any preceding claim wherein the mixture also contains a carbonisable binding agent.
13. A method as claimed in claim 12 wherein the binding agent is sulphite lye or lignin sulphonate.
14. A method as claimed in claim 12 or claim 13 wherein the quantity of binding agent present is from 0.1 to 5% by weight of the mixture.
15. A method as claimed in any preceding claim wherein the dolomite and stabilising agent are simultaneously mixed and reduced in particle size before being pelletised.
16. A method as claimed in any preceding claim wherein the particle size of the components ofthe mixture is such that the mixture will pass a 72 BS sieve.
17. A method as claimed in claim 16 wherein the particle size of the components of the mixture is such that the mixture will pass a 100 BS sieve.
18. A method for preparing a dead-burned refractory material substantially as herein before described in
Example 1 or Example 2.
19. A refractory material produced by a method as claimed in any preceding claim.
20. A refractory dead-burned material having a micro-structure in which particles of stabilised lime (as hereinbefore defined) are at least partially enveloped in or coated with magnesia.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB7906409A GB2042499A (en) | 1979-02-23 | 1979-02-23 | Stabilised dead-burned dolomite |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB7906409A GB2042499A (en) | 1979-02-23 | 1979-02-23 | Stabilised dead-burned dolomite |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB2042499A true GB2042499A (en) | 1980-09-24 |
Family
ID=10503384
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB7906409A Withdrawn GB2042499A (en) | 1979-02-23 | 1979-02-23 | Stabilised dead-burned dolomite |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2042499A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0229025A3 (en) * | 1986-01-07 | 1988-07-20 | Quigley Company Inc. | Slaking-resistant refractory aggregates and process for producing the same |
| US5908801A (en) * | 1997-05-23 | 1999-06-01 | Servicios Industriales Penoles, S.A. De C.V. | Process for the production of synthetic dolomite |
| WO2007096246A3 (en) * | 2006-02-20 | 2008-01-17 | Refratechnik Holding Gmbh | Fire-resistant ordinary ceramic batch, and fire-resistant product therefrom |
| CN107188584A (en) * | 2017-07-18 | 2017-09-22 | 海城市中兴镁质合成材料有限公司 | A kind of fused magnesite and its preparation technology using dicalcium silicate as combination phase |
| CN112266235A (en) * | 2020-10-30 | 2021-01-26 | 湖北冶金地质研究所(中南冶金地质研究所) | Method for preparing dolomite brick from calcium-magnesium phosphate ore tailings and composite magnesium raw materials |
| WO2021165300A1 (en) * | 2020-02-20 | 2021-08-26 | Refractory Intellectual Property Gmbh & Co. Kg | Grains for the production of a sintered refractory product, a batch for the production of a sintered refractory product, a process for the production of a sintered refractory product and a sintered refractory product |
| CN117024017A (en) * | 2023-08-17 | 2023-11-10 | 同济大学 | A kind of preparation method of β-C2S crystal structure |
-
1979
- 1979-02-23 GB GB7906409A patent/GB2042499A/en not_active Withdrawn
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0229025A3 (en) * | 1986-01-07 | 1988-07-20 | Quigley Company Inc. | Slaking-resistant refractory aggregates and process for producing the same |
| US5908801A (en) * | 1997-05-23 | 1999-06-01 | Servicios Industriales Penoles, S.A. De C.V. | Process for the production of synthetic dolomite |
| WO2007096246A3 (en) * | 2006-02-20 | 2008-01-17 | Refratechnik Holding Gmbh | Fire-resistant ordinary ceramic batch, and fire-resistant product therefrom |
| CN101384520A (en) * | 2006-02-20 | 2009-03-11 | 耐火材料控股有限公司 | Refractory ordinary ceramic blank and refractory product prepared from same |
| CN101384520B (en) * | 2006-02-20 | 2013-06-12 | 耐火材料控股有限公司 | Refractory ordinary ceramic blanks and refractory products prepared therefrom |
| CN107188584A (en) * | 2017-07-18 | 2017-09-22 | 海城市中兴镁质合成材料有限公司 | A kind of fused magnesite and its preparation technology using dicalcium silicate as combination phase |
| WO2021165300A1 (en) * | 2020-02-20 | 2021-08-26 | Refractory Intellectual Property Gmbh & Co. Kg | Grains for the production of a sintered refractory product, a batch for the production of a sintered refractory product, a process for the production of a sintered refractory product and a sintered refractory product |
| CN114945544A (en) * | 2020-02-20 | 2022-08-26 | 里弗雷克特里知识产权两合公司 | Grain for producing sintered refractory product, batch for producing sintered refractory product, method for producing sintered refractory product, and sintered refractory product |
| JP2023514492A (en) * | 2020-02-20 | 2023-04-06 | リフラクトリー・インテレクチュアル・プロパティー・ゲー・エム・ベー・ハー・ウント・コ・カーゲー | Particles for producing sintered refractory products, batches for producing sintered refractory products, methods for producing sintered refractory products and sintered refractory products sex product |
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| CN112266235A (en) * | 2020-10-30 | 2021-01-26 | 湖北冶金地质研究所(中南冶金地质研究所) | Method for preparing dolomite brick from calcium-magnesium phosphate ore tailings and composite magnesium raw materials |
| CN117024017A (en) * | 2023-08-17 | 2023-11-10 | 同济大学 | A kind of preparation method of β-C2S crystal structure |
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