GB793743A - Fused magnesia and process of making the same - Google Patents

Fused magnesia and process of making the same

Info

Publication number
GB793743A
GB793743A GB985156A GB985156A GB793743A GB 793743 A GB793743 A GB 793743A GB 985156 A GB985156 A GB 985156A GB 985156 A GB985156 A GB 985156A GB 793743 A GB793743 A GB 793743A
Authority
GB
United Kingdom
Prior art keywords
per cent
magnesia
calcining
product
graded
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
GB985156A
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.)
Norton Grinding Wheel Co Ltd
Original Assignee
Norton Grinding Wheel Co Ltd
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 Norton Grinding Wheel Co Ltd filed Critical Norton Grinding Wheel Co Ltd
Priority to GB985156A priority Critical patent/GB793743A/en
Publication of GB793743A publication Critical patent/GB793743A/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
    • 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

Landscapes

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

Abstract

Periclase of high electrical resistance is made by fusing magnesia in an electric furnace with the addition of up to 10 per cent of carbon, preferably 3 to 5 per cent of petroleum coke. The product is broken up, ground and graded, and the sized material is then calcined in an oxidizing atmosphere at about 1300 DEG C. Amorphous magnesia containing 90 per cent or more of MgO, obtained by calcining Indian magnesite is preferred but other forms, e.g. sea-water magnesia, may be used, in the form of fines or pellets. This is mixed with coke of 10 mesh size and fused in an arc furnace. The product is free from alkali and alkaline earth salts, and is readily broken up. The graded material after calcining may be used as an insulator for electric heating elements.ALSO:Periclase of high electrical resistance is made by fusing magnesia in an electric furnace with the addition of up to 10 per cent by weight of carbon, preferably 3 to 5 per cent of petroleum coke. The product is broken up, ground, and graded; the sized material is then calcined in an oxidising atmosphere at about 1300 DEG C. Amorphous magnesia containing 90 per cent or more of MgO obtained by calcining Indian magnesite is preferred, but other forms, e.g., sea water magnesia may be used, in the form of fines or pellets. This is mixed with coke of 10 mesh size and fused in an arc furnace. The product is free from alkali or alkaline earth salts, and is readily broken up. The graded material, after calcining may be used as an insulator for electric heating elements.
GB985156A 1956-03-29 1956-03-29 Fused magnesia and process of making the same Expired GB793743A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB985156A GB793743A (en) 1956-03-29 1956-03-29 Fused magnesia and process of making the same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB985156A GB793743A (en) 1956-03-29 1956-03-29 Fused magnesia and process of making the same

Publications (1)

Publication Number Publication Date
GB793743A true GB793743A (en) 1958-04-23

Family

ID=22150133

Family Applications (1)

Application Number Title Priority Date Filing Date
GB985156A Expired GB793743A (en) 1956-03-29 1956-03-29 Fused magnesia and process of making the same

Country Status (1)

Country Link
GB (1) GB793743A (en)

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