FIELD: secondary precious metal recovery.
SUBSTANCE: recovery of silver from waste, such as spent catalysts and ashes, us accomplished by charging waste into soda-borax melt taken in such proportions that weight of soda is by 2.0-3.5 times superior to that of oxide constituent of starting material and weight of borax constitutes 8-20% that of soda. Melting is effected at 1120-1350°C and melt is aged then for at least 15-20 min, after which products are separated and silver is recovered. Weight of charged waste (Pw) is found in dependence of content oxide constituent therein using formula (wt %): Pw = (11.5-16.7)MeO+(0.5-1.0)Na2B2O7+9SiO2 ( Me is Ca, Al, or 2Na).
EFFECT: achieved essentially complete recovery of silver.
1 tbl, 5 ex
| Title | Year | Author | Number |
|---|---|---|---|
| METHOD OF RECOVERING GOLD FROM GOLD ORE CONCENTRATES | 2004 |
|
RU2259410C1 |
| METHOD OF PROCESSING PRODUCTS CONTAINING CHALCOHENIDES OF NON-NOBLE METALS, LEAD, METALS OF PLATINUM GROUP, GOLD AND SILVER | 2005 |
|
RU2291212C1 |
| METHOD FOR REPROCESSING OF JUNKS OF MAGNESIUM CONTAINING BASED-BASED ALLOYS | 2003 |
|
RU2244027C1 |
| METHOD FOR REPROCESSING OF COPPER-CONTAINING SECONDARY RAW MATERIAL | 2000 |
|
RU2181386C1 |
| METHOD OF RECOVERY OF METALS OF PLATINUM GROUP FROM CONCENTRATES ON BASE OF FERROUS SULFIDES | 1998 |
|
RU2154117C2 |
| METHOD OF PROCESSING LEAD WASTES CONTAINING NOBLE AND RARE METALS | 2001 |
|
RU2191835C1 |
| METHOD OF RECOVERY OF NOBLE METALS FROM PRODUCTS CONTAINING SILVER CHLORIDE, METALS OF PLATINUM GROUP AND GOLD | 1999 |
|
RU2164255C2 |
| METHOD OF PLATINUM-GROUP METALS EXTRACTION FROM SPENT CATALYSTS ON CARRIERS OUT OF ALUMINIUM OXIDE | 2013 |
|
RU2564187C2 |
| METHOD OF PRODUCING NOBLE METALS FROM CARBONACEOUS MATERIALS | 1996 |
|
RU2114202C1 |
| METHOD OF RECOVERY OF NON-FERROUS METALS FROM COPPER-AND-LEAD WASTES CONTAINING TIN AND ANTIMONY | 1999 |
|
RU2154682C1 |
