Riedel-de Haen Aktiengesellschaft

Rudolf Hirschberg

Bernd Schonfeld

Chlorofluoroferrates(II,III) are manufactured by fusing alkali metal halides or ammonium halides with an iron(III) halide and metallic iron. The starting materials used are, in particular, (a) an alkali metal chloride or ammonium chloride, (b) an alkali metal fluoride or ammonium fluoride, (c) anhydrous iron(III) chloride and (d) iron powder. The reaction is carried out a temperature of 300.degree. to 900.degree. C. The chlorofluoroferrates, which have a markedly lower hygroscopicity compared with customary chloroferrates, are particularly suitable for use as active fillers for grinding wheels.

Chlorofluoroferrate(II,III), a process for its manufacture, its use and

In grinding disks, toxic lead chloride and antimony sulfide may be replaced by non-toxic alkali metal chloroferrates (II,III) produced by melting together alkali metal chloride, anhydrous ferric chloride and iron powder.

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Bad Nenndorf, Germany

Rudolf Hirschberg