PRODUCTION OF ACICULAR HEMATITE PARTICLE POWDER

PURPOSE:To provide a process for the industrial production of an essentially high-density acicular hematite particle having improved crystallinity while keeping the acicular form of the starting material. CONSTITUTION:The objective acicular hematite particle having an average major axis diameter of...

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Bibliographische Detailangaben
Hauptverfasser:	HONNA TORAYUKI, NAKAMURA TATSUYA
Format:	Patent
Sprache:	eng
Schlagworte:	BASIC ELECTRIC ELEMENTS CHEMISTRY COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F ELECTRICITY INDUCTANCES INORGANIC CHEMISTRY MAGNETS METALLURGY SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES TRANSFORMERS
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Beschreibung
Zusammenfassung:	PURPOSE:To provide a process for the industrial production of an essentially high-density acicular hematite particle having improved crystallinity while keeping the acicular form of the starting material. CONSTITUTION:The objective acicular hematite particle having an average major axis diameter of 0.1-0.5gm and a specific surface area of 15-60m /g measured by BET method can be produced by heating and dehydrating acicular goethite particle at 250-400 deg.C to obtain acicular hematite particle having an average length of 0.1-0.5mum and a specific surface area of 70-150m /g measured by BET method and subjecting an aqueous dispersion containing the hematite particles to hydrothermal treatment at 150-250 deg.C.