Specialized metallurgical processes – compositions for use therei – Compositions – Solid treating composition for liquid metal or charge
Patent
1990-11-14
1992-07-07
Andrews, Melvyn J.
Specialized metallurgical processes, compositions for use therei
Compositions
Solid treating composition for liquid metal or charge
75470, 75472, C21B 504
Patent
active
051279398
ABSTRACT:
An improved iron ore sinter for use in a blast furnace is made from a raw sinter mix comprising: iron-bearing materials; basic fluxes including a source of CaO and a source of MgO; and solid carbon-bearing material usually coke breeze, used as a heat-generating combustible. To produce the sinter, the raw sinter mix is subjected to a sintering treatment at a high temperature in order to cause the iron-bearing materials, fluxes and carbon-bearing material to agglomerate and sinter by incipient fusion; an air-cooling treatment in order to produce a hard lumpy substance having a porous cellular structure; and a mechanical treatment to break the lumpy substance into a specific size range. The improvement to the above sinter lies in that the source of MgO in the raw sinter mix exclusively consists of synthetic olivine obtained by calcination of serpentinite. Such a use of synthetic olivine has numerous and unexpected advantages over the use of natural olivine as a source of MgO in the manufacture of iron ore sinter for blast furnace, especially in terms of enhanced sinter strength, improved sinter reduction properties and productivity.
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Legast Pierre
Panigrahy Sarat C.
Rigaud Michel G.
Andrews Melvyn J.
Ceram SNA Inc.
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