GB2514898A - A method of producing refractory material - Google Patents

A method of producing refractory material Download PDF

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Publication number
GB2514898A
GB2514898A GB1406133.7A GB201406133A GB2514898A GB 2514898 A GB2514898 A GB 2514898A GB 201406133 A GB201406133 A GB 201406133A GB 2514898 A GB2514898 A GB 2514898A
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Prior art keywords
screened
particles
feed material
dolomite
sintered
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GB201406133D0 (en
GB2514898B (en
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John Carlill
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Steetley Dolomite Ltd
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Steetley Dolomite Ltd
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    • 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
    • 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
    • C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/62204—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products using waste materials or refuse
    • 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
    • C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
    • C04B35/62605—Treating the starting powders individually or as mixtures
    • C04B35/6261—Milling
    • 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
    • C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/64—Burning or sintering processes
    • 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
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/3205—Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
    • C04B2235/3208—Calcium oxide or oxide-forming salts thereof, e.g. lime
    • C04B2235/321—Dolomites, i.e. mixed calcium magnesium carbonates
    • 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
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/327—Iron group oxides, their mixed metal oxides, or oxide-forming salts thereof
    • C04B2235/3272—Iron oxides or oxide forming salts thereof, e.g. hematite, magnetite
    • 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
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
    • C04B2235/54—Particle size related information
    • C04B2235/5418—Particle size related information expressed by the size of the particles or aggregates thereof
    • C04B2235/5427—Particle size related information expressed by the size of the particles or aggregates thereof millimeter or submillimeter sized, i.e. larger than 0,1 mm
    • 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
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
    • C04B2235/54—Particle size related information
    • C04B2235/5463—Particle size distributions

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Compositions Of Oxide Ceramics (AREA)
  • Processing Of Solid Wastes (AREA)

Abstract

Refractory material is produced using dolomite feed material, which is sintered and then screened. Screened particles of 2mm and above are conveyed for use in a refractory process. Screened particles of less than 2mm to be recycled as part of the feed material for the sintering step. The sintering step may include the addition of Fe2O3. Also disclosed is a method where in the screening step the sintered dolomite is screened to isolate particles of between 2mm and substantially 8mm for use in refractory material, and which takes screened particles over 8mm in size, crushes them and returns them to the screening step.

Description

A method of producing refractory material The present invention relates to a method of producing refractory material.
Refractory materials are used in structures that are exposed to high temperature environments, such as furnaces or kilns. Superior refractory material is required for structures such as electric arc furnaces, where the material may be exposed to temperatures of up to 3000°C.
It is known to produce superior monolithic hearth repair material for electric arc furnaces using premitun quality magnesia or magnesium oxide (MgO). However, there are drawbacks to the use of MgO. Energy costs for production of MgO are high, and it is produced from a raw material which is in limited supply.
The applicant has recognised that a combination of sintered dolomite and MgO can lead to a refractory material having the superior quality of MgO refractory material and of similar value for use in an electric furnace. The production cost of such a material is lower than that of an MgO-onIy refractory material due to the lower production cost of sintered dolomite.
There are drawbacks to the use of sintered dolomite. Particles of sintered dolomite having a size smaller than 2mm are less refractory than required, so waste away with molten steEl when used in a furnace. This can he addressed by using a coarser grade of sintered dolomite, so that the proportion of particles less than 2mm is decreased. However, this can lead to issues with inconsistency of the product, especiafly as segregation of particles according to size can occur prior to packaging of the sintered dolomite.
Refractory material comprised of 70% MgO and 30% sintered dolomite, where the sintered dolomite has a particle size of 2mm to 8mm, has been found to produce the best results, giving an effect equal to refractory material made from 100% MgO at a lower cost. There are difficulties in producing sintered dolomite of optimum particle size, density and chemical structure at the required low production cost.
The present invention pnvides an improved method of sintered dolomite production.
According to an aspect of the present invention there is provided a method of producing refractory material, the method comprising the steps of: a) providing a dolomite feed material; b) sintering the feed material; c) screening the sintered feed material: d) conveying screelled particles of substantially 2mm and above for use in a refractory process; and e) conveying screened particles of less than substantially 2mm to be recycled as part of the feed material in step a).
The particles smaller than 2mm that are recycled as feed material in step a) reach a high density and agglomerate into larger particulates upon sintering in step b). Re-using the particles smaller than 2mm reduces dolomite waste, saving cost and contributing to the economic viability of the use of dolomite.
In step e), the recycled particles may make up between substantially 7% and sLibstantially 11% of feed material in step a), preferably substantiafly 9% of feed materiaL This proportion of particles smaller than 2mm allows tile sintered dolomite production to he commercially viahe, and aids sintering of the feed material.
In step c), the sintered dolomite may he screened to isolate particles of between substantially 2mm and substantially 8mm for use in refractory materiaL Step c) may comprise a single screening process for isolating particles below substantially 2mm and above substantially 8mm, increasing efficiency of the method.
The method may further comprise the step f) of crushing screened particles over sLibstantially 8mm in size and returning them to the screening process of step c).
Crushing and returning the oversize particles reduces waste of material, thus reducing cost.
In step c), the sintered dolomite may be screened such that the screened sintered dolomite comprises less than substantially 1% particles of a size greater than substantially 8mm.
in step c), the sintered dolomite may be screened such that the screened sintered dolomite comprises less than 2% particles of a size smaller than substantially 2mm.
Restricting the levels of dolomite particles outside the desired size in this way provides suitably consistent grading of the screened sintered dolomite.
The screened sintered dolomite may have a bulk density above substantially 3.lg/cm3, preferably above substantially 3.2g/cm3, more preferably in the range of substantially 3.2g/cm3 to 3.25g1cm3.
The high density improves the refractory properties of the refractory material produced from the screened sintered dolomite.
In step h), Fe203 may he added to the feed materiaL Preferably, the proportion of Fe203 to screened sintered dolomite is between substantially 6% and substantially i 0%, more preferably substantiafly 8%.
Adding Fe203 gives optimum high density of the sintered dothmite.
The Fe203 added to the feed material may be obtained from waste product, preferably from miliscale.
Obtaining Fe203 from waste product advantageously reduces cost.
In step c), screening maybe carried out using a liner.
There is further provided a method of producing refractory material comprising the steps of: a) providing dothmite feed material: b) sintering the feed material; and c) screening the sintered dolomite to isolate particles of between substantially 2mm and substantially 8mm for use in refractory material.
As mentioned above, it has been found that sintered dolomite with a particle size of between 2mm and 8mm leads to the best results in refractory material.
The method may further comprise step d) of crushing screened particles over 8mm in size and returning them to the screening process of step c).
Crushing and returning the oversize particles reduces waste of material, thus reducing cost.
In step c), the sintered dolomite may he screened such that the screened sintered dolomite contains less than substantially I % particles of a size greater than substantially 8mm.
In step c), the sintered dolomite may he screened such that the screened sintered dolomite contains less than substantially 2% of particles of a size smaller than substantially 2mm.
Restricting the levels of dothmite particles outside the desired size in this way provides suitahy consistent grading of the screened siritered dolomite.
The screened sintered dolomite may have a bulk density above substantially 3.lg/cm3, preferably substantially above substantially 3.2g/cm3.
The high density improves the refractory properties of the refractory material produced from the screened sintered dolomite.
In step h), Fe203 may he added to the feed materiaL Preferably, the proportion of Fe203 to screened sintered dolomite is between substantially 6% and substantially iO%, more preferably substantiafly 8%.
The addition of Fe203 to the feed material gives optimum high density of the sintered dolomite.
The Fe203 added to the feed material may be obtained from waste product, preferably from miliscale.
As stated above, obtaining Fe203 from waste product advantageously reduces cost.
In step c), screening may be carried out using a liner.
Other aspects and features of the invention will be apparent from the claims and following description of embodiments, made by way of example, with reference to the following drawings, in which: Figure I is a schematic diagram showing a first process of the invention; and Figure 2 is a schematic diagram showing a second process of the invention.
Figures I and 2 show an exemplary method for the production of sintered dolomite refractory material. The method in this embodiment includes first and second main processes 10, 50.
The first process 10 is sintering of dolomite, and is shown in Figure I. Figure 2 shows the second process 50 of screening and crushing of the sintered dolomite produced by the first process 10 to provide suitable refractory material 64. The refractory material 64 can be combined with MgO refractory material to create a refractory material of 30% sintered dolomite refractory material, 70% MgO refractory material.
In the first process 10, dolomite stone or dolostone feed material 13 is sintered and calcined in a rotary kiln 14, using suitable fLiel I 5 such as petleiim coke. The majority of the feed material i 3 is raw dolomite stone i 2. The resulting product is sintered dolomite 16.
The sintered dolomite I 6 is then screened, to ensure that only particles of a predetermined size make up the finished product 64. In this embodiment, a first screening 52 of the sintered dolomite 16 takes place to remove particles 54 having a diameter of more than 8mm. The particles 54 are conveyed to a crusher 55, where crushing 56 takes place. The particles 54 are then returned for screening 52. This avoids waste of the over-sized particles, in this embodiment, the crusher 55 is a cone crusher, although other suitable crushers may be used.
Particles 58 of a maximum diameter of 8mm or less are conveyed to a second screening 60, where particles 62 having a diameter of less than 2mm are removed.
in an alternative embodiment, the first and second screenings 52, 60 take place simultaneously, or the second screening 60 takes place prior to the first screening 52.
The particles 62 are conveyed to a silo (not shown) and fed to the kiln 14, and so are recycled as feed material 13 in the first process 10. When sintered in the kiln i 4, the particles 62 agglomerate into larger particles, and form part of the sintered dolomite 16 used in the second process 50. Re-using the particles 62 advantageously reduces dolomite waste. Tn this exemplary embodiment, the recycled particles 62 form between 7% and Ii %, preferably 9%, of the feed material 13 sintered and calcined in the kiln 14, though in alternative embodiments the recycled particles may form some other suitable proportion of the feed material i 3.
The recycled particles 62 are in this embodiment supplied to the kiln 14 hi a homogenous feed at a constant rate of 3 tonnes per hour, controlling the proportion of particles 62 in the feed material 13. Raw dolomite stone 12 is supplied at a rate of 30 tonnes per hour. The raw dolomite stone 12 is calcined in the kiln 14 as described above. The recycled particles 62, however, are already calcined, and so no further calcining of these particles 62 takes place.
The proportion of the recycled particles 62 in the finished refractory material product 64 is therefore between substantially 14% and 22%, preferably substantially 18%.
The remaining particles 66 are those having a maximum diameter of between substantiafly 2mm and substantially 8mm. These particles 66 form the refractory material 64.
As described above, the sintered dolomite 16 is screened to control the particle size of the refractory material 64. In this embodiment the first screening 52 ensures that the refractory material 64 includes 1% or less by weight of particles of a size greater than substailtially 8mm. In this embodiment, the second screening 60 ensures that the refractory material 64 includes 2% or less by weight of particles of a size smaller thall substantially 2mm. The screening 52, 60 thus provides highly consistent grading of the refractory material 64. In alternative embodiments, other suitable proportions of these particle sizes may be used.
During the first process 10, iron oxide (Fe203) 18 is added to the dolomite feed material 13 in the kiln 14. The addition of Fe203 18 increases the density of the sintered dolomite 16. In this exemplary embodiment, the proportion of Fe203 18 to dothmite in the refractory materia' 64 is between 6% and 10%, preferably 8%. The amount of Fe203 added to the kiln 14 is controlled in order to ensure that the refractory material 64 has a small standard deviation in iron content. This proportion of Fe203 18 optimises the density of sintered dolomite 16 and thus the refractory material 64, and also provides refractory material 64 with properties similar to those of refractory material produced using magnesite. The kiln 14 is in this embodiment at a temperature of at least 1800°C. At this temperature, depending on the levEl of iron oxide, the dolomite becomes substantially molten.
In this exemplary embodiment, the refractory material 64 has a hulk density above substailtially 3. lg/cm3, preferably above substantially 3.2 g/cm3. The term bulk density is here used to indicate the mass of a number of particles of the material divided by the total volume occupied by those particles.
The Fe203 18 is in this embodiment obtained from waste product in order to save costs. The Fe203 of this exemplary embodiment is high quality millscale obtained from steel rolling mills, which is inexpensive and in plentiful supply. In alternative embodiments other waste product sources of Fe203 may he used.
Screening 52, 60 of the sintered dolomite 62 is carried out in this embodiniefit with a liller 68, though in alternative embodiments other suitable screening methods may be used. The liner 68 is in this embodiment part of the crusher 55, so that crushing 56 and screening 52, 60 take place at the same locatioll.
The liller 68 is configured to allow a minimum of particles of a size less than 2mm into the refractory material 64, so that the refractory material 64 advantageously includes 2% or less by weight of particles of a size smaller than substantially 2mm as described above.
The method of producing refractory material 64 described above provides refractory material of suitably high density, with consistent Fe2O: content and consistent particle size grading.
Recycling of particles smaller than 2mm improves efficiency and reduces cost of the method.
Segregation of the particles prior to packaging is limited due to the r&ative similarity of partide size.

Claims (35)

  1. Claims A method of producing refractory material, the method comprising the steps of: a) providing a dolomite feed materiaL h) sintering the feed material; c) screening the suitered feed materiaL d) conveying screelled particles of substantially 2mm and above for use in a refractory process; and e) conveying screened particles of less than substantially 2mm to be recycled as part of the feed material in step a); wherein in step b), Fe203 is added to the feed material.
  2. 2. A method according to claim 1, wherein the proportion of Fe203 to screened sintered dolomite is between substantially 6% and substantially 10%.
  3. 3. A method according to claim 2, wherein the proportion of Fe203 to screened sintered dolomite is substantially 8%.
  4. 4. A method according to any one of claims I to 3, wherein the Fe203 added to the feed material is obtained from waste product.
  5. 5. A method according to claim 4, wherein the Fe203 added to the feed material is obtained from mifiscale.
  6. 6. A method according to any one of claims I to 5, wherein in step c), the sintered dolomite is screened such that the screened sintered dolomite comprises less than substailtially 2% of particles of a size smaller than substantially 2mm.
  7. 7. A method according to any one of claims 1 to 6, wherein the screened sintered dolomite has a bulk density above substantially 3.lgIcm3. tO
  8. 8. A method according to any one of claims I to 6 wherein the screened sintered dolomite has a hifik density above substantially 3.2g/cm3.
  9. 9. A method according to any preceding claim, wherein in step c) screening is carried out using a liner.
  10. 10. A method of producing refractory material comprising the steps of: a) providing dolomite feed material: b) sintering the feed material; c) screening the sintered dolomite to isolate particles of between substantially 2mm and substantially 8mm for use in refractory material; and d) crushing screened particles over substantiafly 8mm in size and returning them to the screening process of step c).
  11. 11. A method according to claim 10, wherein in step c) the sintered dolomite is screened such that the screened sintered dolomite contains less than substantially 1% particles of a size greater than suhstantiafly 8mm.
  12. 12. A method according to daim 10 or claim i I, wherein in step c) the sintered dolomite is screened such that the screened sintered dolomite contains tess than substantially 2% of partides of a size smaller than substantially 2mm.
  13. 13. A method according to any one of claims 10 to 12, wherein the screened sintered dolomite has a hifik density above substantially 3.! g/cm3.
  14. 14. A method according to any one of claims 10 to 12, wherein the screened sintered dolomite has a bulk density above substantially 3.2g/cm3.
  15. 15. A method according to any one of claims 10 to 14, wherein in step b) Fe203 is added to the feed material. Ii
  16. 16. A method according to claim 15, wherein the proportion of Fe203 to screened sintered dolomite is between sLibstantially 6% and substantiafly 10%.
  17. 17. A method according to claim 17, wherein the proportion of Fe203 to screened sintered dolomite is substantially 8%.
  18. 18. A method accordifig to any one of claims 15 to 17, wherein the Fe203 added to the feed material is obtained from waste product.
  19. 19. A method according to claim 18, wherein the Fe203 added to the feed material is obtained from miliscale.
  20. 20. A method according to any one of daims 10 to 19, wherein screening is carried out using a liner.
  21. 21. A method of producing refractory material, the method comprising the steps of: a) providing a dolomite feed materiaL h) sintering the feed material; c) screening the sintered feed materiaL d) conveying screened particles of substantially 2mm and above for use in a refractory process; and e) conveying screened particles of less than substantially 2mm to he recycled as part of the feed materia' in step a).
  22. 22. A method according to claim 21, wherein in step e), the recycled partic'es make tip between 7% and Ii % of feed material in step a).
  23. 23. A method according to claim 21 or claim 22, wherein in step c), the sintered dolomite is screened to isolate particles of between substantially 2mm and substarnially 8mm for use in refractory material.
  24. 24. A method according to claim 23, wherein step c) comprises a single screening process for isolating particles below substantially 2mm and above substantially 8mm.
  25. 25. A method according to claim 23 or claim 24, further comprising the step f) of crushing screened particles over substantially 8mm in size and returning them to the screenillg process of step c).
  26. 26. A method according to any one of claims 23 to 25, wherein in step c), the sintered dolomite is screened such that the screened sincereci dolomite comprises less than substantially 1% of particles of a size greater than substantially 8mm.
  27. 27. A method according to any one of claims 21 to 26, wherein in step c), the sintered dolomite is screened such that the screened sintered dolomite comprises less than substantially 2% of particles of a size smaller than substantially 2mm.
  28. 28. A method according to any one of claims 21 to 27, wherein the screened sintered dolomite has a hifik density above substantially 3.! g/cm3.
  29. 29. A method according to any one of claims 2! to 28, wherein the screened sintered dolomite has a hifik density above substantially 3.2g/cm3.
  30. 30. A method according to any of claims 2! to 2, wherein in step h) Fe203 is added to the feed material.
  31. 31. A method according to claim 30, wherein the proportion of Fe203 to screened sintered dolomite is between sLibstantially 6% and substantiafly 10%.
  32. 32. A method according to claim 31, wherein the proportion of Fe203 to screened sintered dolomite is substantially 8%.
  33. 33. A method according to any one of claims 30 to 32, wherein the Fe2Oi added to the feed material is obtained from waste productS
  34. 34. A method according to daim 33, wherein the Fe203 added to the feed material is obtained from mifiscale.
  35. 35. A method according to any of claims 21 to 34, wherein in step c) screeiug is carried out using a liner.amendments to the claims have been filed as follows 1. A method of producing refractory material, the method comprising the steps of: a) providing a dolomite feed material; b) sintering the feed material; c) screening the sintered feed material; d) conveying screened particles of 2mm and above for use in a refractory process; and e) conveying screened particles of less than 2mm to be recycled as part of the feed material in step a); wherein in step b), Fe203 is added to the feed material.2. A method according to claim 1, wherein the proportion of Fe203 to screened sintered dcilomite is between 6% and 10%.*.-15 o 3, A method according to claim 2, wherein the proportion of Fe203 to screened sintered dolomite is 8%.CC) 4. A method according to any one of claims 1 to 3, wherein the Fe203 added to the feed material is obtained from waste product.5. A method according to claim 4, wherein the Fe203 added to the feed material is obtained from millscale, 6. A method according to any one of claims 1 to 5, wherein in step c), the sintered d&omite is screened such that the screened sintered dolomite comprises less than 2% of particles of a size smaller than 2mm.7. A method according to any one of claims I to 6, wherein the screened sintered dolomite has a bulk density above 3. Ig/cm3.8. A method according to any one of claims I to 6, wherein the screened sintered dolomite has a bulk density above 3.2g/cm3.9, A method according to any preceding claim, wherein in step c) screening is carried outusingaliner.10, A method according to any one of claims 1 to 9, wherein in step e), the recycled particles make up between 7% and 11% of feed material in step a).11. A method according to any one of claims 1 to 10, wherein in step c), the sintered dolomite is screened to isolate particles of between 2mm and 8mm for use in refractory material.12. A method according to claim 11, wherein step c) comprises a single screening process -.-15 for isolating particles below 2mm and above 8mm.13. A method according to claim 1! or claim 12, further comprising the step f) of 0 crushing screened particles over 8mm in size and returning them to the screening process of C) step c).14. A method according to any one of claims II to 13, wherein in step c), the sintered dolomite is screened such that the screened sintered dolomite comprises less than 1% of particles of a size greater than 8mm.
GB1406133.7A 2013-04-04 2014-04-04 A method of producing refractory material Active GB2514898B (en)

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Citations (4)

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Publication number Priority date Publication date Assignee Title
US3940279A (en) * 1974-06-17 1976-02-24 Corning Glass Works Size-graded ternary batch for bonded basic refractory shapes
RO96940A2 (en) * 1987-02-17 1989-04-28 Institutul De Cercetari Metalgice,Ro PROCESS FOR OBTAINING DOLOMITIC OR MAGNESIVE NONFACONNED PRODUCTS
US20060122051A1 (en) * 2003-01-17 2006-06-08 Refractory Intellectual Property Gmbh & Co. Kg Batch for producing a refractory ceramic shaped body, shaped body made therefrom, and a use thereof
CN102167607A (en) * 2011-01-27 2011-08-31 营口鲅鱼圈耐火材料有限公司 Dolomite non-burning carbon brick and preparation method thereof

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3940279A (en) * 1974-06-17 1976-02-24 Corning Glass Works Size-graded ternary batch for bonded basic refractory shapes
RO96940A2 (en) * 1987-02-17 1989-04-28 Institutul De Cercetari Metalgice,Ro PROCESS FOR OBTAINING DOLOMITIC OR MAGNESIVE NONFACONNED PRODUCTS
US20060122051A1 (en) * 2003-01-17 2006-06-08 Refractory Intellectual Property Gmbh & Co. Kg Batch for producing a refractory ceramic shaped body, shaped body made therefrom, and a use thereof
CN102167607A (en) * 2011-01-27 2011-08-31 营口鲅鱼圈耐火材料有限公司 Dolomite non-burning carbon brick and preparation method thereof

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GB2517098A (en) 2015-02-11
GB2514899B (en) 2015-07-29
GB2517098B (en) 2015-07-29
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GB2519702A (en) 2015-04-29
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