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Process for Producing Iron Oxide Pigments



Published August 10, 2005
Patent No. U.S. 6,503,315
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˚C, converting the suspension of haematite nuclei to a suspension of haematite pigment and optionally recovering the pigment as a solid.


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