PRODUCTION OF GRANULAR GOETHITE FINE-PARTICLE POWDER AND PRODUCTION OF GRANULAR IRON OXIDE FINE-PARTICLE POWDER USING THE POWDER
PURPOSE:To obtain a granular goethite fine-particle powder excellent in particle size dispersion by allowing a ferrous salt soln. to react with a specified aq. alkali soln. and to obtain a granular iron oxide fine-praticle powder excellent in dispersibility by heating and dehydrating or heating and...
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| creator | KUROKAWA HARUMI |
| description | PURPOSE:To obtain a granular goethite fine-particle powder excellent in particle size dispersion by allowing a ferrous salt soln. to react with a specified aq. alkali soln. and to obtain a granular iron oxide fine-praticle powder excellent in dispersibility by heating and dehydrating or heating and burning the powder. CONSTITUTION:An aq. ferrous salt soln. contg. 0.3-0.6mol/l Fe is allowed to react with an aq. alkali soln. free of ammonia, contg. 0.1-0.3mol of alkali hydroxide per mol of alkali carbonate and with the total amt. controlled to >=1.0 equivalent with respect to Fe in a nonoxidizing atmosphere to obtain a suspension contg. an iron-contg. precipitate. The suspension is kept at 50-65 deg.C and agitated for 30 to 360min, then 0.5-5.0 atomic % water-soluble silicate, expressed in terms of Si and based of Fe, is added, the silicate is oxidized at 50-60 deg.C by passing air through the suspension, and the precipitate is filtered off, washed and dried to obtain a goethite fine-particle powder. The powder is heated at 250-500 deg.C and dehydrated or further heated at 300-800 deg.C and burnt to obtain a granular iron oxide fine-particle powder. |
| format | Patent |
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CONSTITUTION:An aq. ferrous salt soln. contg. 0.3-0.6mol/l Fe<2+> is allowed to react with an aq. alkali soln. free of ammonia, contg. 0.1-0.3mol of alkali hydroxide per mol of alkali carbonate and with the total amt. controlled to >=1.0 equivalent with respect to Fe<2+> in a nonoxidizing atmosphere to obtain a suspension contg. an iron-contg. precipitate. The suspension is kept at 50-65 deg.C and agitated for 30 to 360min, then 0.5-5.0 atomic % water-soluble silicate, expressed in terms of Si and based of Fe<2+>, is added, the silicate is oxidized at 50-60 deg.C by passing air through the suspension, and the precipitate is filtered off, washed and dried to obtain a goethite fine-particle powder. The powder is heated at 250-500 deg.C and dehydrated or further heated at 300-800 deg.C and burnt to obtain a granular iron oxide fine-particle powder.</description><edition>6</edition><language>eng</language><subject>ADHESIVES ; BASIC ELECTRIC ELEMENTS ; CHEMISTRY ; COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F ; DYES ; ELECTRICITY ; INDUCTANCES ; INORGANIC CHEMISTRY ; MAGNETS ; METALLURGY ; MISCELLANEOUS APPLICATIONS OF MATERIALS ; MISCELLANEOUS COMPOSITIONS ; NATURAL RESINS ; PAINTS ; POLISHES ; PREPARATION OF CARBON BLACK ; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES ; TRANSFORMERS ; TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS,TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES</subject><creationdate>1995</creationdate><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&date=19951009&DB=EPODOC&CC=JP&NR=H07257929A$$EHTML$$P50$$Gepo$$Hfree_for_read</linktohtml><link.rule.ids>230,308,776,881,25543,76294</link.rule.ids><linktorsrc>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&date=19951009&DB=EPODOC&CC=JP&NR=H07257929A$$EView_record_in_European_Patent_Office$$FView_record_in_$$GEuropean_Patent_Office$$Hfree_for_read</linktorsrc></links><search><creatorcontrib>KUROKAWA HARUMI</creatorcontrib><title>PRODUCTION OF GRANULAR GOETHITE FINE-PARTICLE POWDER AND PRODUCTION OF GRANULAR IRON OXIDE FINE-PARTICLE POWDER USING THE POWDER</title><description>PURPOSE:To obtain a granular goethite fine-particle powder excellent in particle size dispersion by allowing a ferrous salt soln. to react with a specified aq. alkali soln. and to obtain a granular iron oxide fine-praticle powder excellent in dispersibility by heating and dehydrating or heating and burning the powder. CONSTITUTION:An aq. ferrous salt soln. contg. 0.3-0.6mol/l Fe<2+> is allowed to react with an aq. alkali soln. free of ammonia, contg. 0.1-0.3mol of alkali hydroxide per mol of alkali carbonate and with the total amt. controlled to >=1.0 equivalent with respect to Fe<2+> in a nonoxidizing atmosphere to obtain a suspension contg. an iron-contg. precipitate. The suspension is kept at 50-65 deg.C and agitated for 30 to 360min, then 0.5-5.0 atomic % water-soluble silicate, expressed in terms of Si and based of Fe<2+>, is added, the silicate is oxidized at 50-60 deg.C by passing air through the suspension, and the precipitate is filtered off, washed and dried to obtain a goethite fine-particle powder. 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CONSTITUTION:An aq. ferrous salt soln. contg. 0.3-0.6mol/l Fe<2+> is allowed to react with an aq. alkali soln. free of ammonia, contg. 0.1-0.3mol of alkali hydroxide per mol of alkali carbonate and with the total amt. controlled to >=1.0 equivalent with respect to Fe<2+> in a nonoxidizing atmosphere to obtain a suspension contg. an iron-contg. precipitate. The suspension is kept at 50-65 deg.C and agitated for 30 to 360min, then 0.5-5.0 atomic % water-soluble silicate, expressed in terms of Si and based of Fe<2+>, is added, the silicate is oxidized at 50-60 deg.C by passing air through the suspension, and the precipitate is filtered off, washed and dried to obtain a goethite fine-particle powder. The powder is heated at 250-500 deg.C and dehydrated or further heated at 300-800 deg.C and burnt to obtain a granular iron oxide fine-particle powder.</abstract><edition>6</edition><oa>free_for_read</oa></addata></record> |
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| subjects | ADHESIVES BASIC ELECTRIC ELEMENTS CHEMISTRY COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F DYES ELECTRICITY INDUCTANCES INORGANIC CHEMISTRY MAGNETS METALLURGY MISCELLANEOUS APPLICATIONS OF MATERIALS MISCELLANEOUS COMPOSITIONS NATURAL RESINS PAINTS POLISHES PREPARATION OF CARBON BLACK SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES TRANSFORMERS TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS,TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES |
| title | PRODUCTION OF GRANULAR GOETHITE FINE-PARTICLE POWDER AND PRODUCTION OF GRANULAR IRON OXIDE FINE-PARTICLE POWDER USING THE POWDER |
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