IRON OXIDE RED AND IRON OXIDE BROWN MICROGRANULATES, A PROCESS FOR THEIR PREPARATION AND THEIR USE

摘要

Iron Oxide Red and Iron Oxide Brown Microgranulates, a Process for their Preparation and their Use A process for the preparation of iron oxide red or iron oxide brown pigment microgranulates is disclosed wherein aqueous suspensions comprising iron oxide yellow or iron oxide black are subjected to spray granulating drying and the microgranulates thus obtained, which have diameters of from 20 to 600.mu.m, are tempered by heating at temperatures of from 200 .degree.C to 1000 .degree.C. Le A 27 208