FIELD: technological processes.
SUBSTANCE: invention can be used in the preparation of fluoride salts used in the production of aluminum by electrolysis. Treatment of the regeneration cryolite is carried out with aluminum sulfate or aluminum chloride at a temperature of 60–80 °C for 20–120 minutes while maintaining pH 2–4. After this, the product is dehydrated and dried. Invention makes it possible to obtain a mixture of cryolite and chiolite with a low sodium content without the use of hydrofluoric acid and corrosion-resistant equipment.
EFFECT: reduced sodium content in the regenerated fluoride salts allows to return more salts to production.
1 cl, 1 dwg, 3 tbl, 1 ex
| Title | Year | Author | Number |
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SU1047836A1 |
