METHOD FOR RECOVERING RARE EARTH ELEMENT FROM USED RARE EARTH ELEMENT TYPE ABRASIVE MATERIAL
PROBLEM TO BE SOLVED: To recover a rare earth element from a used rare earth element type abrasive material as hydroxide or oxide in high purity at a relatively low cost. SOLUTION: A used rare earth element type abrasive material is treated with an aq. mineral acid soln. to dissolve the rare earth e...
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| creator | UCHINO YOSHIJI |
| description | PROBLEM TO BE SOLVED: To recover a rare earth element from a used rare earth element type abrasive material as hydroxide or oxide in high purity at a relatively low cost. SOLUTION: A used rare earth element type abrasive material is treated with an aq. mineral acid soln. to dissolve the rare earth element and the resultant soln. is separated from the undissolved material and recovered. Oxalic acid and an aq. alkali oxalate soln. are added to the recovered soln. so that the soln. is adjusted to |
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SOLUTION: A used rare earth element type abrasive material is treated with an aq. mineral acid soln. to dissolve the rare earth element and the resultant soln. is separated from the undissolved material and recovered. Oxalic acid and an aq. alkali oxalate soln. are added to the recovered soln. so that the soln. is adjusted to <=pH 5 and the rare earth element is deposited as oxalate. This oxalate is recovered by solid-liquid separation and converted into hydroxide by treatment with an aq. alkali hydroxide soln. The hydroxide of the rare earth element and an aq. alkali oxalate soln. formed by the treatment are recovered by solid-liquid separation. The recovered aq. alkali oxalate soln. is reutilized in the oxalate depositing step.</description><edition>7</edition><language>eng</language><subject>CHEMISTRY ; CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS ; COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM,CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THERARE-EARTH METALS ; FERROUS OR NON-FERROUS ALLOYS ; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC ; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS ; INORGANIC CHEMISTRY ; METALLURGY ; PRETREATMENT OF RAW MATERIALS ; PRODUCTION AND REFINING OF METALS ; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS ; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE ; TREATMENT OF ALLOYS OR NON-FERROUS METALS</subject><creationdate>2000</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=20000328&DB=EPODOC&CC=JP&NR=2000087154A$$EHTML$$P50$$Gepo$$Hfree_for_read</linktohtml><link.rule.ids>230,308,780,885,25564,76547</link.rule.ids><linktorsrc>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&date=20000328&DB=EPODOC&CC=JP&NR=2000087154A$$EView_record_in_European_Patent_Office$$FView_record_in_$$GEuropean_Patent_Office$$Hfree_for_read</linktorsrc></links><search><creatorcontrib>UCHINO YOSHIJI</creatorcontrib><title>METHOD FOR RECOVERING RARE EARTH ELEMENT FROM USED RARE EARTH ELEMENT TYPE ABRASIVE MATERIAL</title><description>PROBLEM TO BE SOLVED: To recover a rare earth element from a used rare earth element type abrasive material as hydroxide or oxide in high purity at a relatively low cost. SOLUTION: A used rare earth element type abrasive material is treated with an aq. mineral acid soln. to dissolve the rare earth element and the resultant soln. is separated from the undissolved material and recovered. Oxalic acid and an aq. alkali oxalate soln. are added to the recovered soln. so that the soln. is adjusted to <=pH 5 and the rare earth element is deposited as oxalate. This oxalate is recovered by solid-liquid separation and converted into hydroxide by treatment with an aq. alkali hydroxide soln. The hydroxide of the rare earth element and an aq. alkali oxalate soln. formed by the treatment are recovered by solid-liquid separation. 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SOLUTION: A used rare earth element type abrasive material is treated with an aq. mineral acid soln. to dissolve the rare earth element and the resultant soln. is separated from the undissolved material and recovered. Oxalic acid and an aq. alkali oxalate soln. are added to the recovered soln. so that the soln. is adjusted to <=pH 5 and the rare earth element is deposited as oxalate. This oxalate is recovered by solid-liquid separation and converted into hydroxide by treatment with an aq. alkali hydroxide soln. The hydroxide of the rare earth element and an aq. alkali oxalate soln. formed by the treatment are recovered by solid-liquid separation. The recovered aq. alkali oxalate soln. is reutilized in the oxalate depositing step.</abstract><edition>7</edition><oa>free_for_read</oa></addata></record> |
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| subjects | CHEMISTRY CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM,CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THERARE-EARTH METALS FERROUS OR NON-FERROUS ALLOYS GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS INORGANIC CHEMISTRY METALLURGY PRETREATMENT OF RAW MATERIALS PRODUCTION AND REFINING OF METALS TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE TREATMENT OF ALLOYS OR NON-FERROUS METALS |
| title | METHOD FOR RECOVERING RARE EARTH ELEMENT FROM USED RARE EARTH ELEMENT TYPE ABRASIVE MATERIAL |
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