Acicular goethite particle prodn

Producing goethite particles involves: (a) adding a sub-stoichiometric amount of alkali to an aq. Fe(II) salt soln. to ppte. a complex intermediate product; (b) oxidising the Fe(II) in the ppte. to Fe(III) at a mean oxidn. rate of less than 10 (pref. 2-9) g produced Fe(III)/l./hr., until 20-70 mol%...

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Bibliographische Detailangaben
Hauptverfasser:	BLAGEV, ALBENA V., ST. PAUL, MINN., US, ENDRES, GERALD C., ST. PAUL, MINN., US
Format:	Patent
Sprache:	eng ; ger
Schlagworte:	BASIC ELECTRIC ELEMENTS CASTING CHEMISTRY COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F ELECTRICITY INDUCTANCES INFORMATION STORAGE INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER INORGANIC CHEMISTRY MAGNETS MAKING METALLIC POWDER MANUFACTURE OF ARTICLES FROM METALLIC POWDER METALLURGY PERFORMING OPERATIONS PHYSICS POWDER METALLURGY SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES TRANSFORMERS TRANSPORTING WORKING METALLIC POWDER
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Beschreibung
Zusammenfassung:	Producing goethite particles involves: (a) adding a sub-stoichiometric amount of alkali to an aq. Fe(II) salt soln. to ppte. a complex intermediate product; (b) oxidising the Fe(II) in the ppte. to Fe(III) at a mean oxidn. rate of less than 10 (pref. 2-9) g produced Fe(III)/l./hr., until 20-70 mol% of the Fe(II) is converted into Fe(III); and (c) increasing the mean oxidn. rate to more than 10 (pref. more than 12) g produced Fe(III)/l./hr. so that goethite seed particles are formed.