processo para obtenção de concentrados de titánio com elevado teor de tio2 e baixo teor de radionuclìdeos a partir de concentrados mecánicos de anatásio.

摘要

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.