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
  • C04B35/16—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 silicates other than clay
  • C04B35/20—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 silicates other than clay rich in magnesium oxide, e.g. forsterite
• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
  • C03B5/00—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture
  • C03B5/16—Special features of the melting process; Auxiliary means specially adapted for glass-melting furnaces
  • C03B5/235—Heating the glass
  • C03B5/237—Regenerators or recuperators specially adapted for glass-melting furnaces
  • C03B5/2375—Regenerator brick design ; Use of materials therefor; Brick stacking arrangements
• • 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
  • C04B35/04—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 magnesium oxide
  • C04B35/043—Refractories from grain sized mixtures
• • 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
  • C04B35/653—Processes involving a melting step
  • C04B35/657—Processes involving a melting step for manufacturing refractories
• • 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
  • C04B2235/3206—Magnesium oxides or oxide-forming salts thereof
• • 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
  • C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
  • C04B2235/3427—Silicates other than clay, e.g. water glass
  • C04B2235/3436—Alkaline earth metal silicates, e.g. barium silicate
  • C04B2235/3445—Magnesium silicates, e.g. forsterite
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
  • Y02P40/00—Technologies relating to the processing of minerals
  • Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping

Definitions

• the invention relates to a refractory ceramic offset, a refractory molding formed from this offset and the use of the molding.
• a process for the production of a burnt magnesia brick with a forsteritic matrix which contains 15 to 30% by mass of zirconium silicate (ZrSiO 4 ).
• ZrSiO 4 zirconium silicate
• These stones have basically proven themselves. They are used, for example, in the form of so-called lattice stones (also called pebbles) in regenerator lattices of glass melting furnaces.
• lattice stones also called pebbles
• their corrosion resistance and resistance to temperature changes and thermal shocks is especially for a long-term use of stones (> 10 years) can be improved.
• zirconium silicate is expensive.
• DE 102006007781 A1 describes a refractory offset with a basic main component based on MgO or MgO / CaO, the term main component being defined as being present in excess of 60% by mass.
• the remaining offset components consist of a forsterite material or a mixture that forms forsterite. From this offset refractory bricks are obtained after a fire, which can be used for example in rotary kilns for cement production or Kalkschachtöfen. It is emphasized that these stones in the said furnaces have a good resistance to silicate melt phases which originate from the kiln and in particular form a permanent deposit on the refractory lining in parts of rotary kilns.
• the object of the invention is to provide an offset for the production of a refractory in the application ceramic molding, preferably in the upper and middle grid area of a Regenerator- lattice of glass melting furnaces and in the baffle in the area Entrance of the grid can be used and is characterized by good thermal conductivity, heat storage capacity and corrosion resistance.
• melt forsterite can therefore be well above the lower limit of 30% by mass, based on the total offset, for example with lower limits of 40, 55, 65, 75 or 85% by mass. Accordingly, the proportion in particular of the coarse component is reduced, so that all offset components add up to 100 mass%.
• the proportion of the fine component is between 32 and 45% by mass, that of the coarse component between 55 and 68% by mass.
• Particularly good corrosion properties have stones which are formed from an offset, in which the mass fraction of the fine component is greater than the mass fraction of the coarse component.
• the ratio of fine component / coarse component may be, for example, 80/20, 85/15, 90/10 or 95/5.
• the proportions of the sintering aid and any other components are not taken into account. Their proportion reduces the mass fractions of the fine and coarse components accordingly.
• the melting forster of the fine component can be completely or partially replaced by Forsteritsinter.
• forsterite sinter can be used as the other component.
• the synthesized forsterite component (s) has the significant advantage of being largely free of iron oxide (FeOZFe 2 O 3 ).
• Another advantage, for example compared to in-situ formed forsterite, is that higher mass fractions can be achieved in the microstructure of the molding, since the in-situ forsterite formation is associated with an increase in volume.
• the offset should have a maximum content of FeO + Fe 2 O 3 ⁇ 1, 0% by mass, preferably ⁇ 0.5% by mass, preferably 0% by mass.
• the phase diagram of the mixture series Mg 2 SiO 4 - Fe 2 SiO 4 confirms the higher refractoriness of iron oxide-poor magnesia silicates. Further optimizations with regard to the corrosion behavior result when the CaO content is limited to ⁇ 2% by mass. This requires the use of a more or less pure MgO material as a coarse component.
• the content of ZrO 2 ZZrSiO 4 should be as low as possible, preferably ⁇ 0.5 mass%, based on the total offset. Offsets and molded parts free of ZrO 2 ZZrSiO 4 are preferred. By dispensing with ZrO 2 ZZrSiO 4 , the moldings are easier to burn out of the offset and the corrosion resistance under reducing conditions and with alkali attack is improved.
• the fine component may be present in a particle size ⁇ 0.7 mm, but it may also be much finer, for example ⁇ 100 microns.
• the coarse component typically has a grain size of up to 5 or 8 mm.
• a clay suspension is suitable.
• a refractory ceramic molded body can be produced by shaping and subsequent firing at temperatures above 1500 ° C, in such a way that the coarse component is embedded like an island in a Forsteritmatrix.
• FIG. (1) A microsection of a shaped body according to the invention is shown in FIG. (1) denotes MgO grains which are island-like in the forsterite matrix (2).
• Inventive moldings have a good corrosion resistance to sulfates and alkalis in the exhaust gas, as they occur especially in the middle region of regenerator grids (also called condensation zone).
• the term "middle area” refers to a viewing in the vertical direction, that is to say, the grid also has an area above this central area and an area below this middle section such as SiO 2 and / or CaO may be carried over the upper area of the grating through the central area into the lower area of the grating., Accordingly, the temperatures in the upper area of the grating are particularly high and can reach 1,500 ° C. In the middle chamber area, the temperature load by the exhaust gases at about 1,000 ° C, while in the lower part of the chamber lattice 800 ° C and less.
• the moldings have a high corrosion resistance, even against SiO 2 dust, which passes from the region of a glass trough in the hot areas of the baffle and the upper grid area of a Regeneratorgitt für
• the coarse component comprises magnesia in the form of fused or sintered magnesia with typical MgO contents of 85 to 99% by weight, preferably above 95% by weight.
• magnesia and quartz sand in addition to the sintering aid and any other minor components.

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• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Ceramic Engineering (AREA)
• Manufacturing & Machinery (AREA)
• Materials Engineering (AREA)
• Organic Chemistry (AREA)
• Structural Engineering (AREA)
• Inorganic Chemistry (AREA)
• Compositions Of Oxide Ceramics (AREA)
• Furnace Housings, Linings, Walls, And Ceilings (AREA)
• Building Environments (AREA)

Applications Claiming Priority (2)

Publications (1)

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• 2007
  • 2007-12-06 DE DE102007058665A patent/DE102007058665B4/de not_active Expired - Fee Related
• 2008
  • 2008-11-07 CN CN200880119341.3A patent/CN101970376B/zh not_active Expired - Fee Related
  • 2008-11-07 EP EP08857384A patent/EP2222617A1/de not_active Ceased
  • 2008-11-07 MX MX2010006047A patent/MX2010006047A/es unknown
  • 2008-11-07 AU AU2008333636A patent/AU2008333636B2/en not_active Ceased
  • 2008-11-07 BR BRPI0819999-0A patent/BRPI0819999A2/pt not_active IP Right Cessation
  • 2008-11-07 US US12/744,325 patent/US8138110B2/en not_active Expired - Fee Related
  • 2008-11-07 CA CA2706152A patent/CA2706152C/en not_active Expired - Fee Related
  • 2008-11-07 EA EA201000753A patent/EA022052B1/ru not_active IP Right Cessation
  • 2008-11-07 JP JP2010536343A patent/JP5608561B2/ja not_active Expired - Fee Related
  • 2008-11-07 WO PCT/EP2008/009423 patent/WO2009071162A1/de active Application Filing
• 2010
  • 2010-05-27 ZA ZA2010/03793A patent/ZA201003793B/en unknown

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