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
  • C04B33/00—Clay-wares
  • C04B33/02—Preparing or treating the raw materials individually or as batches
  • C04B33/13—Compounding ingredients
  • C04B33/132—Waste materials; Refuse ; Residues
  • C04B33/1324—Recycled material, e.g. tile dust, stone waste, spent refractory material
• • 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
  • C04B2235/3418—Silicon oxide, silicic acids or oxide forming salts thereof, e.g. silica sol, fused silica, silica fume, cristobalite, quartz or flint
• • 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
  • Y02P40/60—Production of ceramic materials or ceramic elements, e.g. substitution of clay or shale by alternative raw materials, e.g. ashes

Definitions

• the present invention relates to use of grinding swarfs of conglomerated stone production as an ingredient of clay raw material for brickware, earthenware and similar ceramic products, which are processed during their manufacturing by temperatures exceeding 900 0 C.
• the swarfs may contain 30 to 50 percent by weight of water, 75 to 85 percent by weight of silicon dioxide, 6 to 10 percent by weight of organic matter and 2 to 5 percent by weight of metal salt.
• the organic matter contained in the swarf is typically represented by residues of polymerized resin that is used as a binding agent for all substrate components employed for conglomerated stone manufacturing.
• the content of heavy metal is low and does not exceed the natural background that results from prevailing use of natural resources for conglomerated stone manufacturing, which level does not go beyond 30 mg.kg "1 .
• the object of the present invention is to find out a solution to stop wasteful treatment of grinding swarfs and to exploit their positive physical and chemical features for their secondary processing while respecting environmental issues regarding the waste treatment, whereby this specific goal is achieved by the use of grinding swarfs of conglomerated stone production as an ingredient of clay raw material for brickware, earthenware and similar ceramic products, which are processed during their manufacturing by temperatures exceeding 900 0 C.
• grinding swarfs of conglomerated stone production as an ingredient of clay raw material for brickware, earthenware and similar ceramic products is particularly advantageous in the case where natural plastic raw clays, representing the basic raw material, do not contain the necessary content of siliceous chemicals, especially of silicon dioxide required to obtain quality final products.
• the use of grinding swarfs represents an issue for achieving an optimum composition of the mentioned basic raw material, especially for eliminating the effects of the lack of the mentioned silicon dioxide etc.
• the organic matter that are contained in grinding swarfs burn completely during the processing of the brickware, earthenware and other clay raw material and due to its calorific capacity influences positively the calorific balance of the baking process.
• the ceramic products are manufactured by mixing suitable plastic clays with water completed by their shaping, drying, and baking.
• the plastic clays represent not solidified sedimentary rock constituted by a mixture of hydrated aluminic siliceous minerals whose structure is able to absorb a large amount of molecularly bound water.
• the choice of natural raw material and the following manufacturing process are deciding for quality and properties ceramic products. If, for instance, the plastic clay based brick-clay that is the basic raw material for brickware, contains a lower proportion of silicon dioxide and other silicon modifications, this lack is eliminated by addition of silicon dioxide either in the form, for instance, of native amorphous silicates or natrium silicate or similar that ensure a sufficient viscosity of the brickware raw material and, possibly, even easier transformation of heavy metal oxides into insoluble silicates during the baking process by temperatures exceeding 900 0 C.
• the grinding swarfs are put into the mixing device for basic plastic clay-based raw material preparation for ceramic products, for instance in the following proportion:
• the basic raw material with addition of the grinding swarfs and other components is processed with usual pressing, cutting and shaping to obtain desired forms.
• Other processing steps as raw product drying and its baking follow in a usual way it means after drying follows one baking step at least by temperatures of 900 0 C to 1 500 0 C, without any negative impact of the grinding swarfs on these processes, except that they take partly part, together with other usual ingredients, as wood sawdust, in the calorific balance of the baking process and the subsequent product porosity and the like.
• the grinding swarfs may possibly contain even some polymerized residues of the material substrate for artificial stone manufacturing that were scraped down from the walls of the manufacturing equipment during preventive maintenance.

Landscapes

• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Ceramic Engineering (AREA)
• Environmental & Geological Engineering (AREA)
• Dispersion Chemistry (AREA)
• Materials Engineering (AREA)
• Structural Engineering (AREA)
• Organic Chemistry (AREA)
• Compositions Of Oxide Ceramics (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

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Family Applications (1)

Country Status (3)

Family Cites Families (8)

• 2007
  • 2007-01-05 CZ CZ20070014A patent/CZ302929B6/cs not_active IP Right Cessation
  • 2007-12-20 WO PCT/CZ2007/000115 patent/WO2008080371A1/en not_active Ceased
  • 2007-12-20 EP EP07855990A patent/EP2104652A1/en not_active Withdrawn

Non-Patent Citations (1)

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