US Patent Issued to Rio Tinto Alcan International on July 29 for "Use of calcium fluoride in the bayer process" (Canadian Inventors)

ALEXANDRIA, Va., July 30 -- United States Patent no. 12,371,337, issued on July 29, was assigned to Rio Tinto Alcan International Ltd. (Montreal).

"Use of calcium fluoride in the bayer process" was invented by Lisa Cote (Canton-Tremblay, Canada), Sebastien Fortin (Chicoutimi, Canada) and Elizabeth Gingras-Lafleur (Chicoutimi, Canada).

According to the abstract* released by the U.S. Patent & Trademark Office: "A Bayer process includes contacting bauxite and calcium fluoride with sodium hydroxide and forming a slurry, with the calcium fluoride may provide at least 1 wt. % of the calcium added to the process, and precipitating alumina from the slurry."

The patent was filed on Feb. 24, 2020, under Application No. 17/433,450.

*For further in...