C - Chemistry – Metallurgy – 03 – C
Patent
C - Chemistry, Metallurgy
03
C
149/17
C03C 15/02 (2006.01)
Patent
CA 1151514
A b s t r a c t The invention relates to a polishing method for pressed glass or ground glass articles. As is conventional, polishing is effected in a bath containing sulfuric acid and hydrofluoric acid. Rinsing with a sulfuric acid and/or water washing bath intervenes and follows the polishing process. according to the method of the invention, the sodium and/or potassium ions resulting from the dissolution of glass constituents are removed from the polishing bath by the following means: a) by adding fluorosilioic acid to the polishing bath, pre- cipitating the correspoinding silicofluorides and filter- ing off the solid matter, b) by electrolysis in a mercury cell with the formation of sodium- and/or potassium amalgam, c) by electrolysis in a cell having a cation semi-permeable membrane or d) with the aid of cation exchangers. 8199III
366267
Salzle Erich
Sim & Mcburney
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