FIELD: metallurgy.
SUBSTANCE: procedure for production of refined silver consists in leaching industrial products containing silver in nitric acid, in separation of non-soluble residue from nitrate solution of silver, in silver reduction, in separation of produced silver powder from solution and its re-melting. Upon separation of non-soluble residue nitrate solution of silver is treated with hydroxide of alkali metal to pH (1-3) and is heated to temperature 80-100°C. Silver is reduced by treatment of nitrate solution of silver with sulphite of alkali metal or ammonia, and reduction is finished, when value of redox potential (relative to a chlorine-silver reference electrode) reaches 200-250 mV. Before re-melting produced silver powder is flushed in diluted solution of hydrofluoric acid.
EFFECT: production of refined silver of high quality.
2 tbl, 1 ex
| Title | Year | Author | Number |
|---|---|---|---|
| METHOD OF SILVER RECEIVING | 2008 |
|
RU2378398C2 |
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| METHOD OF PREPARING AFFINATED SILVER FROM INDUSTRIAL PRODUCTS | 1993 |
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| METHOD OF PROCESSING WASTE POTASSIUM BIFLUORIDE | 2016 |
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| METHOD OF RECOVERY OF NOBLE METALS FROM PRODUCTS CONTAINING SILVER CHLORIDE, METALS OF PLATINUM GROUP AND GOLD | 1999 |
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| TREATMENT METHOD OF ZINC-BEARING GOLDEN-SILVER CYANIC SEDIMENTS | 2007 |
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| METHOD OF PRODUCING SILVER NITRATE OF HIGH PURITY | 2015 |
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RU2585788C1 |
| METHOD FOR EXTRACTION OF SILVER FROM REFINING INTERMEDIATE PRODUCTS CONTAINING SILVER CHLORIDE | 1993 |
|
RU2038394C1 |
