Treatment of waste sulfuric acid by gypsum precipitation in a ti

Details Treatment of waste sulfuric acid by gypsum precipitation in a ti Treatment of waste sulfuric acid by gypsum precipitation in a ti

1992-08-21

1994-03-29

McCarthy, Neil M.

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

210721, 210747, 210768, 423 82, 423 85, 423166, 423555, C02F 158

Patent

active

052981690

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.

REFERENCES:
patent: 3375066 (1968-03-01), Murakami et al.
patent: 3760058 (1973-09-01), Langmesser et al.
patent: 4208393 (1980-06-01), LeBel
Palmer, E. R., and Judd, B., "The Production of High-Titania Products from Ilmenite by a Sulphuric Acid Process", New Zealand Engineering, vol. 28, No. 8, Aug. 15, 1973, pp. 227-233.

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