REDUCED IRON POWDER FOR EMITTING HEAT SLOWLY IN ATMOSPHERE AND ITS MANUFACTURE

PURPOSE:To obtain the titled reduced iron powder which emits heat slowly in the atmosphere and having excellent pyrogenic properties by crushing sponge iron obtained by reducing iron oxide to obtain iron powder contg. specified particle- size powder in a specified ratio, and purifying the iron powde...

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Bibliographic Details
Main Authors MAEDA YOSHIAKI, MINEGISHI TOSHIYUKI, OKABE RITSUO
Format Patent
LanguageEnglish
Published 26.12.1985
Subjects
ADHESIVES
CASTING
CHEMISTRY
DYES
MAKING METALLIC POWDER
MANUFACTURE OF ARTICLES FROM METALLIC POWDER
MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FORELSEWHERE
METALLURGY
MISCELLANEOUS APPLICATIONS OF MATERIALS
MISCELLANEOUS COMPOSITIONS
NATURAL RESINS
PAINTS
PERFORMING OPERATIONS
POLISHES
POWDER METALLURGY
TRANSPORTING
WORKING METALLIC POWDER
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Summary:PURPOSE:To obtain the titled reduced iron powder which emits heat slowly in the atmosphere and having excellent pyrogenic properties by crushing sponge iron obtained by reducing iron oxide to obtain iron powder contg. specified particle- size powder in a specified ratio, and purifying the iron powder by magnetic separation to obtain the powder having specified iron content. CONSTITUTION:Iron oxide such as mill scale is reduced by coke, etc. to obtain sponge iron. Then the sponge iron is crushed coarsely, then moderately, and finally pulverized successively through a coarse crusher, a moderate crusher, and a pulverizer to obtain iron powder in irregular form having <=60-mesh particle size, where the ratio of powder having <=200 mesh is regulated to 40-80wt%, based on the whole powder, and having >=0.120m /g specific surface. The iron powder is not submitted to finish reduction in an atmosphere contg. hydrogen, and the powder is directly purified by magnetic separation to obtain the iron powder contg. metallic iron in the range of 75-99%. The reduced iron powder emitting heat slowly in the atmosphere, having high leading temp. at an early stage, and capable of emitting heat for many hours can be obtained in this way.
Bibliography:Application Number: JP19840118787