Fluorine recovery from phosphate rock concentrates.
Nash-BD; Blake-HE Jr.
Albany, OR: U.S. Department of the Interior, Bureau of Mines, RI 8205, 1977 Jan; :1-16
The Bureau of Mines continued its research into the recovery of fluorine by the phosphoric acid acidulation defluorination of phosphate rock concentrates. A small process development unit with a capacity of about 10 kilograms of charge per hour was operated, and concentrates from both Idaho and Florida were processed. Over 80 percent of the fluorine was evolved and recovered as a dilute fluosilicic acid solution. Phosphate extraction from the concentrates always exceeded 98 percent. The fluorine was converted to a synthetic fluorspar product (3CaF2.SiO2) suitable for use as a slag conditioner in electric furnace steelmaking operations.
IH; Report of Investigations
NTIS Accession No.
Fluorine recovery from phosphate rock concentrates