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US 4,540,557 AGranted
Process for reducing the fluorine content in wet-processed phosphoric acid
AssigneeHoechst Aktiengesellschaft
InventorsReinhard Gradl, Gunther Schimmel
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Abstract
The disclosure relates to a process for reducing the fluorine content in wet-processed phosphoric acid. To this end, the disclosure provides for an acid extract in an organic solvent to be treated with an at least 45 weight % suspension of aluminum hydroxide of which 99% consist of particles with a size of less than 1 .mu.m, the balance consisting of particles with a size of less than 10 .mu.m.
Claims6
A process for producing phosphoric acid solutions from crude wet-processed phosphoric acid, containing fluorine ions, which process comprises extracting the said crude acid with an organic solvent;
- washing the organic phosphoric acid extract obtained with an aqueous aluminum hydroxide suspension containing at least 45 weight % aluminum hydroxide of which 99% consist of particles with a size of less than 1 .mu.m, the balance consisting of particles with a size of less than 10 .mu.m;
- reextracting the washed extract with water, with the resultant formation of the purified phosphoric acid having reduced fluorine content.
Dependencies are inferred from the claim text.