FIELD: chemistry.
SUBSTANCE: rare-earth metal phosphates are crystallised from supersaturated solutions of wet-process phosphoric acid using a solid seeding material - granular cerium phosphate hemihydrate. Continuous back and forth movement of said seeding material is generated in fluidised bed conditions. The fluidised bed is created by continuous flow of air from the bottom up, opposite to the movement of the wet-process phosphoric acid solution.
EFFECT: invention increases the degree of pickup of a concentrate of rare-earth metal phosphates while reducing consumption of seeding material.
2 tbl, 1 ex
| Title | Year | Author | Number |
|---|---|---|---|
| METHOD OF EXTRACTING RARE EARTH METALS FROM WET-PROCESS PHOSPHORIC ACID WHEN PROCESSING APATITE CONCENTRATES | 2016 |
|
RU2640479C2 |
| METHOD OF SULPHURIC ACID DECOMPOSITION OF REM-CONTAINING PHOSPHATE RAW MATERIAL | 2013 |
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| METHOD OF EXTRACTING RARE-EARTH ELEMENTS FROM WET-PROCESS PHOSPHORIC ACID | 2013 |
|
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| METHOD OF EXTRACTING RARE-EARTH METALS FROM PHOSPHOGYPSUM | 2012 |
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| METHOD OF EXTRACTING LANTHANIDES FROM WET-PROCESS PHOSPHORIC ACID | 2010 |
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| METHOD OF EXTRACTING RARE EARTH ELEMENTS FROM EXTRACTION PHOSPHORIC ACID | 2013 |
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| METHOD OF EXTRACTING RARE-EARTH ELEMENTS FROM WET-PROCESS PHOSPHORIC ACID WHEN PROCESSING KHIBINY APATITE CONCENTRATES | 2011 |
|
RU2528692C2 |
| METHOD OF PROCESSING PHOSPHOGYPSUM | 2012 |
|
RU2504593C1 |
| METHOD OF PROCESSING PHOSPHOGYPSUM FOR PRODUCTION OF CONCENTRATE OF RARE EARTH METALS AND GYPSUM | 2013 |
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RU2520877C1 |
| METHOD FOR PRODUCING EXTRACTIVE PHOSPHORIC ACID | 1994 |
|
RU2081819C1 |
