Filterability of the suspension from germanium precipitation with aqueous tannin extract solution
We have already described the use of a neutral aqueous solution of tannin extract to recover germanium from collecting-mains liquor in coking plants. Further pilot commercial trials have encountered problems with the poor filterability of the precipitate obtained when germanium is extracted with this reagent in alkaline media. There are published references to the colloidal nature of the precipitated tannin-germanium complex. It is also known that the alkalinity of the medium influences the degree of association in colloidal systems to a marked extent. Accordingly, special research was needed to establish the relationship between the pH of the precipitation medium and the filterability of the germanium deposit. Samples of collecting-mains liquor were taken from one of the southern coking plants to determine the optimum filtration behavior. The collecting-mains liquor should first be purged of volatile ammonia and then adjusted to pH = 6.5 to 6.7 for precipitation.
- OSTI ID:
- 6277328
- Journal Information:
- Coke Chem. USSR (Engl. Transl.); (United States), Vol. 6; Other Information: Translated from Koks Khim.; No. 6, 40-41(1978)
- Country of Publication:
- United States
- Language:
- English
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