Conversion of the industrial residue from the water deironing into a hematite red pigment

The data include the raw spectra (Raman, XRD, and DRS), TG/DTG curves, and Doehlert design details related to the research on the thermal conversion of industrial residue from a water treatment plant into a red hematite pigment. The residue, after chemical pre-treatment and drying, was subjected to a thermal treatment under conditions consistent with the presented Doehlert design.