| 摘要 |
A process for recovering alkali titanium fluoride salts suitable for commercial use from spent pickle acid liquors containing titanium by adjusting the fluoride to titanium mole ratio to critical ranges, adding an excess of alkali metal salt, and gently agitating the resulting solution at a temperature of at least 22 DEG C. to crystallize out the alkali metal titanium fluoride salt. The resulting filtrate can be neutralized with lime to yield a much reduced quantity of environmentally safe solid wastes compared with current neutralization practices where a titanium salt is not first recovered. (Optionally, in some cases, the filtrate can be recycled back to the acid pickling operation.) The liquid waste from filtering the neutral solids is low in metals and fluorides and generally acceptable for discharge to public treatment systems.
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