GB394115A - Improvements in or relating to sintered magnesia and refractory materials containing sintered magnesia - Google Patents

Improvements in or relating to sintered magnesia and refractory materials containing sintered magnesia

Info

Publication number
GB394115A
GB394115A GB11707/32A GB1170732A GB394115A GB 394115 A GB394115 A GB 394115A GB 11707/32 A GB11707/32 A GB 11707/32A GB 1170732 A GB1170732 A GB 1170732A GB 394115 A GB394115 A GB 394115A
Authority
GB
United Kingdom
Prior art keywords
lime
ferric oxide
magnesia
added
calcium ferrite
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.)
Expired
Application number
GB11707/32A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Alterra AG
Original Assignee
Alterra AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Alterra AG filed Critical Alterra AG
Publication of GB394115A publication Critical patent/GB394115A/en
Expired legal-status Critical Current

Links

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
    • C04B2/00—Lime, magnesia or dolomite
    • C04B2/10—Preheating, burning calcining or cooling
    • C04B2/104—Ingredients added before or during the burning process
    • 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
    • C04B35/01—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
    • C04B35/0435—Refractories from grain sized mixtures containing refractory metal compounds other than chromium oxide or chrome ore

Abstract

Refractory sintered magnesia is produced from raw materials low in iron by adding to the charge a small proportion of preformed calcium ferrite, or iron oxide and calcium oxide, or substances yielding these compounds, in such relation that the proportion of lime to ferric oxide is not greater than the stoichiometric proportion corresponding to the compound calcium ferrite CaO.Fe2O3, additions of a kind other than lime and ferric oxide being made, or being present as impurities, only in such quantities that the formation of calcium ferrite is not impeded. The lime may be present in the raw material as an impurity. Where the raw material contains acid silicates, or substances yielding such silicates on calcination, sufficient basic material is added to combine with the silicates, and if lime is this basic material sufficient is added to provide an excess to combine with the added ferric oxide. The magnesite may be in a coarsely crushed form and the additions finely crushed. In addition to preformed calcium ferrite, ferric oxide or materials yielding ferric oxide may be added to the charge. The process may also be applied to improve magnesia that has already been sintered. The amount of the ferruginous additions is usually smaller than 10 per cent by weight of the magnesia, but in special cases, e.g. for bricks resistant to sudden changes of temperature, may be equal to or even greater than the magnesia content. In an example, magnesite poor in lime, silica and iron, is mixed with 15 per cent of quick lime and 5 per cent of ferric oxide and is fired at 1350 DEG C. Other examples are given.
GB11707/32A 1931-04-25 1932-04-23 Improvements in or relating to sintered magnesia and refractory materials containing sintered magnesia Expired GB394115A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT394115X 1931-04-25

Publications (1)

Publication Number Publication Date
GB394115A true GB394115A (en) 1933-06-22

Family

ID=3673395

Family Applications (1)

Application Number Title Priority Date Filing Date
GB11707/32A Expired GB394115A (en) 1931-04-25 1932-04-23 Improvements in or relating to sintered magnesia and refractory materials containing sintered magnesia

Country Status (1)

Country Link
GB (1) GB394115A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2851639A (en) * 1952-03-27 1958-09-09 Mosaic Tile Company Electrically-conductive ceramic floortile units and floors composed of such conductive units

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2851639A (en) * 1952-03-27 1958-09-09 Mosaic Tile Company Electrically-conductive ceramic floortile units and floors composed of such conductive units

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