发明名称 |
METHOD OF RECOVERING RARE-EARTH ELEMENTS FROM PHOSPHOGYPSUM |
摘要 |
FIELD: rare-earth element technology. ^ SUBSTANCE: invention relates to technology of recovering rare-earth elements from phosphogypsum obtained from processing of apatite concentrate into mineral fertilizers. Phosphogypsum is treated with 22-30% sulfuric acid solution at liquids-to-solids ratio 1.8-2.2 to recover rare-earth elements and sodium into solution. Insoluble precipitate is separated and degree of oversaturation of solution regarding rare-earth elements is increased by means of providing sodium concentration 0.4-1.2 g/L, after which crystallization of rare-earth element concentrate is allowed to proceed and concentrate is then separated from mother liquor. Treatment duration is 20-30 min to prevent spontaneous crystallization of rare-earth element concentrate in solution before insoluble precipitate is separated. Content of sodium in solution is controlled by adding a sodium salt thereto, preferably sodium sulfate or sodium carbonate. Degree of recovery of rare-earth elements from phosphogypsum into concentrate achieves 71.4%. ^ EFFECT: increased degree of rare-earth element recovery and simplified procedure due to eliminated operation of dilution of recycle sulfuric acid solutions and shortened sulfuric acid treatment duration by a factor of 2-3. ^ 2 cl, 1 tbl, 3 ex |
申请公布号 |
RU2293781(C1) |
申请公布日期 |
2007.02.20 |
申请号 |
RU20050120944 |
申请日期 |
2005.07.04 |
申请人 |
INSTITUT KHIMII I TEKHNOLOGII REDKIKH EHLEMENTOV I MINERAL'NOGO SYR'JA IM. I.V. TANANAEVA KOL'SKOGONAUCHNOGO TSENTRA ROSSIJSKOJ AKADEMII NAUK |
发明人 |
LOKSHIN EHFROIM PINKHUSOVICH;KALINNIKOV VLADIMIR TROFIMOVICH;IVLEV KONSTANTIN GENNAD'EVICH;LEVIN BORIS VLADIMIROVICH;POGREBNJAK OLEG STEPANOVICH |
分类号 |
C22B59/00;C22B3/08 |
主分类号 |
C22B59/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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