Last year while in oildale, California, I studies several issues related to simple salts that might be used to bring raw fuel, even lawn grass clippings, to final product.
I learned that even stenching bromides pumped into the groundwater as a byproduct of hydrofracking may have medicinal value.
The titanium oxide we seek to purify here similar to a moonrock, must economically exceed purification specification, due to risk that the base rock may be partially contaminated with manganese or magnesium; whilst also producing a residual byproduct which is viscous or somewhat uniform in consistency so that it may easily be disposed of.
The issue with the titanium trioxide is that it's main is for use in white colored pig mints.