Synthetic iron oxide red pigments with hematite modification are an important group of pigments that are produced industrially by different methods, including not only the Copperas, precipitation and Penniman processes, but also the Laux method and the Ningbo Process, developed recently by LANXESS and based on patented technology.
The Ningbo method supports sustainable process management in the production of red pigments and has already been implemented by LANXESS at its new production plant in Ningbo, China. A detailed description of the process was provided in the February 2015 issue of PCI.1