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Titania from Intermediates Prepared by Soda-smelting Ilmenite.
Raddatz-AE; O'Keefe-DA; Gomes-JM; Wong-MM
NTIS: PB 295 061 :10 pages
The federal Bureau of Mines, as part of its goal to minimize undesirable environmental impacts associated with mineral processing, has investigated a soda-smelting technique for processing ilmenite into pig iron and a titanium slag that is suitable for a feed to a sulfate-process titania pigment plant. By this procedure, the generation of ferrous sulfate waste and its associated disposal problem is obviated. Molten titania slag was quenched, water leached, and filtered to yield a sodium titanate intermediate product containing about 70 wt-pct tio2, 1 wt-pct fe, and 20 wt-pct na2o. This intermediate product, high-soda titanate (hst), was mixed with h2so4, calcined, quenched, and water leached to produce a low-soda titanate (lst) product that contained only 2 wt-pct na2o. Both the hst and lst were evaluated as feed materials for preparing titania by the sulfate process. About 95 pct of the tio2 was extracted from hst and lst by digestion in concentrated or 50-wt-pct-h2so4 solutions. About 95 pct of the solubilized tio2 was subsequently recovered by the titanyl sulfate solutions by hydrolysis. Barren solutions from hydrolysis, containing about 26- wt-pct h2so4, were upgraded by vacuum-thermal evaporation or electrodialysis. The regenerated acid solutions were used to digest additional hst and lst.
IH; Report of Investigation;
NTIS Accession No.
NTIS: PB 295 061
Page last reviewed: April 12, 2019
Content source: National Institute for Occupational Safety and Health Education and Information Division