Extraction of titanium and iron from ilmenite with fluosilicic acid.
Hansen DA; Traut DE; Fisher GT
Albany, OR: U.S. Department of the Interior, Bureau of Mines, RI 9557, 1995 Jan; :1-12
As part of a U.S. Bureau of Mines program to develop a more continuous titanium metal extraction process that uses domestic resources, a study was made to determine the extraction of titanium (Ti) and iron (Fe) from New York rock ilmenite using fluosilicic acid (H2SiF6 ). The effects of leach temperature, acid concentration, and particle size were investigated for the rate at which Ti and Fe are extracted from the ilmenite. Within the leach time studied, the extraction data fit a shrinking-core model; the rate-controlling step was diffusion of H2SiF6 through an ash layer resulting from a heterogeneous leaching reaction. The rate is linearly dependent on the H2SiF6 concentration and 2 6 is inversely proportional to the square of the particle diameter. Using 2.6M H2SiF6 at 85 deg C, 49% of the Ti and 53% of the Fe in 44- to 74-um New York rock ilmenite were extracted in 3 h.
Mining industry; Underground mining; Minerals; Mineral deposits; Metals; Metallurgical processes
7440-32-6; 7439-89-6; 7664-39-3; 12125-01-8; 12125-01-8; 7664-93-9; 7647-01-0; 16961-83-4
Report of Investigations
NTIS Accession No.
Albany, OR: U.S. Department of the Interior, Bureau of Mines, RI 9557