Method of purifying ammonium fluoride solutions

Details Method of purifying ammonium fluoride solutions Method of purifying ammonium fluoride solutions

1974-11-07

1976-12-28

Stern, Edward

Chemistry of inorganic compounds

Halogen or compound thereof

Ammonium halide

23293R, C01C 116

Patent

active

040002519

ABSTRACT:
Newly precipitated MnO(OH).sub.2 is either added to an NH.sub.4 F solution that has been made slightly basic or this compound is formed in the NH.sub.4 F solution by adding an Mn (II) and an Mn (VII) salt solution. MnO(OH).sub.2 absorbs As and noble metal ions. The purity obtained is 10.sup..sup.-8 per cent by weight (starting from .ltoreq.10.sup..sup.-5 per cent by weight) of NH.sub.4 F solution.

REFERENCES:
patent: 2780522 (1957-02-01), Gloss et al.
patent: 2816818 (1957-12-01), Gross
patent: 3201193 (1965-08-01), Baumann

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