1951. ------. [KRCZIL, F.] [Treatment of Kieselguhr and Like Siliceous Materials.] German Patent 596,093, Apr. 26, 1934 (Cl. 12i-38.02). Chem. Abs., vol. 28, 1934, p. 4548.

PATENTS

1951. ------. [KRCZIL, F.] [Treatment of Kieselguhr and Like Siliceous Materials.] German Patent 596,093, Apr. 26, 1934 (Cl. 12i-38.02). Chem. Abs., vol. 28, 1934, p. 4548.

The process of German Patent 581,123 (abs. 1952) is modified by replacing the heating or inert gases wholly or in part by gases or vapors having a chemical action on the siliceous material or on the impurities associated with it. Thus, gas mixtures containing O₂, CO₂, Cl, HC1, or SO₂ may be used. Indicates various methods of procedure.