Process for Producing Iron Oxide Pigments

摘要

Bayer Aktiengesellschaft has obtained a patent for a process for preparing iron oxide red pigments.The process comprises forming a suspension of haematite nuclei through a reaction between dilute nitric acid and elemental iron at above 90 deg C,converting the suspension of haematite nuclei to a suspension of haematite pigment and optionally recovering the pigment as a solid.