FIELD: process engineering.
SUBSTANCE: invention can be used in chemical industry and production of construction materials. Proposed method comprises processing phosphogypsum by sulfuric solution, filtration, extraction of precipitate of rare-earth metal insoluble compounds and separation of precipitate by filtration. Rare-earth metals are extracted from solution by oxalic acid or its soluble salts at consumption of 250-300 mol % while solution is neutralised to pH=1.0-2.5. Obtained precipitate of oxalates is separated from mother solution, rinsed, dried and calcined.
EFFECT: better ecology, higher quality of rare-earth metal concentrate, rules out application of toxic hydrofluoric acid.
4 tbl, 6 ex
| Title | Year | Author | Number |
|---|---|---|---|
| METHOD FOR EXTRACTION OF RARE EARTH METALS FROM SEMIHYDRATE PHOSPHOGYPSUM | 2021 |
|
RU2770118C1 |
| METHOD OF PROCESSING RARE-EARTH CONCENTRATE | 2014 |
|
RU2573905C1 |
| METHOD OF PROCESSING PHOSPHOGYPSUM WASTES TO OBTAIN A CONCENTRATE OF REE AND GYPSUM PLASTER | 2019 |
|
RU2708718C1 |
| METHOD OF PROCESSING PHOSPHOGYPSUM WASTES TO OBTAIN A CONCENTRATE OF RARE-EARTH ELEMENTS AND GYPSUM PLASTER | 2019 |
|
RU2706401C1 |
| METHOD OF EXTRACTING RARE-EARTH METALS (REM) FROM PHOSPHOGYPSUM | 2013 |
|
RU2526907C1 |
| UNIT FOR EXTRACTION OF RARE EARTH METALS FROM PHOSPHOGYPSUM AND OBTAINING RAW GYPSUM FOR THE PRODUCTION OF CONSTRUCTION MATERIALS | 2022 |
|
RU2802843C1 |
| METHOD OF EXTRACTING RARE-EARTH METALS FROM PHOSPHOGYPSUM | 2012 |
|
RU2491362C1 |
| METHOD OF PROCESSING PHOSPHOGYPSUM | 2012 |
|
RU2504593C1 |
| METHOD OF EXTRACTING RARE-EARTH METALS (REM) FROM PHOSPHOGYPSUM | 2012 |
|
RU2492255C1 |
| METHOD OF EXTRACTING RARE-EARTH ELEMENTS FROM PHOSPHOGYPSUM | 2017 |
|
RU2663512C1 |
