A process to obtain titanium concentrates with high contents of tio2 and low contents of radionuclide elements from anatase mechanical concentrates
CA 2543740 C · Owner: Companhia Vale Do Rio Doce · Inventors: Freitas, Lino Rodrigues De; Horta, Ronaldo De Moreira; Tude, Joao Alberto Lessa
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to a unique process for production of titanium concentrate with low contents of radionuclide elements from anatase mechanical concentrates. This high TiO2 containing concentrate is essentially directed for the chloride process of titanium dioxide pigment manufacture. The process here described basically involves processing anatase mechanical concentrates through the following sequence of unit operations: 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 …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed October 18, 2004 and granted March 24, 2015. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 18, 2024.
- Certificates of supplementary protection extend only drug patents, and it isn't classified as one.
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