Production of titanium dioxide pigment from perovskite concentrates, acid sulfation method
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Production of titanium dioxide pigment from perovskite concentrates, acid sulfation method

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      "To reduce U.S. dependence on imports of titanium, the U.S. Bureau of Mines has investigated the recovery of titanium from perovskite (catio3). Domestic perovskite deposits represent a significant, but untapped, titanium resource. An acid sulfation method was developed that will extract about 97 pct of the titanium and the columbium and 70 to 90 pct of the rare-earth byproducts from perovskite concentrates. A flowsheet for recovering titanium as pigment-grade titanium dioxide (tio2) is discussed. Test work performed in developing each unit operation is described. The first three unit operations have been demonstrated using laboratory-scale continuous methods of operation: acid sulfation of perovskite concentrates, leaching sulfation residue to dissolve metal values, and precipitation of titanium oxysulfate monohydrate (tioso4.H2o) from the resulting leach filtrate. Batch testing of other unit operations was performed: tioso4.H2o redissolution and iron reduction, precipitation of tio2 by hydrolysis, and regenerating recoverable acid with rare-earth byproduct recovery. Cost evaluation results are provided, indicating that processing perovskite concentrates by acid sulfation may be an economically viable means of producing tio2." - NIOSHTIC-2 NIOSHTIC no. 10011178
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