A process for production of titanium concentrate with low contents of
radionuclide elements from anatase mechanical concentrates. The process
involves calcination in air and reduction with hydrogen or any other
reducing gas, both in fluidized bed reactor or rotary kiln, low-intensity
magnetic separation of the reduced product, high-intensity magnetic
separation of the non-magnetic fraction resulting from the low-intensity
magnetic separation, hydrochloric acid leaching of the product of
high-intensity magnetic separation, filtering and dewatering of the
leached product, high temperature oxidation of the dewatered material,
cooling of the oxidized ore, hydrochloric acid leaching of the oxidation
product in the presence of sodium fluoride, filtration and drying of the
product of the second leaching and high intensity magnetic separation,
the non-magnetic fraction of this final magnetic separation becoming the
end product.