Treatment of waste sulfuric acid by gypsum precipitation in a titanium dioxide process
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United States of America Patent
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Mar 29, 1994
Grant Date -
N/A
app pub date -
Aug 21, 1992
filing date -
Aug 21, 1992
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Disclosed is a process for treating waste sulfuric acid generated from a process for producing titanium dioxide pigment by treating titanium slag with sulfuric acid. The waste acid is treated in a first step with a calcium-containing material to produce a gypsum suspension which is filtered and from which a filtrate is recovered. The filtrate is treated in a second step with a calcium-containing substance and clarification solids from the treatment of the titanium slag with sulfuric acid. A precipitate is produced in this second step which is subsequently filtered. The precipitate is suitable for disposal in a landfill.
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