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

Authors
Petersen-AE; Shirts-MB; Allen-JP; Schwier-JH
Source
Salt Lake City, UT: U.S. Department of the Interior, Bureau of Mines, RI 9397, 1992 Jan; :1-47
Link
NIOSHTIC No.
10011178
Abstract
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.
Keywords
Process-charting; Sample-preparation; Experimental-design; Transition-metals; Ore-processing; Pigments; Waste-disposal; Titanium-sulfates; Rare-earths; Ore-concentrates; Extraction-metallurgy; Perovskites; Titanium-dioxide; Precipitation-chemistry; Leaching; Materials-recovery; Titanium; Separation-processes; Acid-treatment; Sulfation
Publication Date
19920101
Document Type
IH; Report of Investigations
Fiscal Year
1992
NTIS Accession No.
PB92-167253
NTIS Price
A04
Identifying No.
RI-9397
NIOSH Division
SLRC
Source Name
Salt Lake City, UT: U.S. Department of the Interior, Bureau of Mines, RI 9397
State
UT
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