Salt removal from treated titanium dioxide
AssigneeKerr-McGee Chemical Corporation
InventorTheodore A. Rado
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Abstract
A method of removing aqueously soluble salt by-products produced by the treatment of raw titanium dioxide particles to add a finish thereto. The finished titanium dioxide particles with the salt are subjected to demineralization with mixed bed ion exchange resins to produce finished titanium dioxide particles substantially free of salt and salt forms of ion exchange resins. The finished titanium dioxide particles are recovered and the salt forms of ion exchange resins are regenerated to produce recoverable salt and reusable resins.
Claims10
A method for producing titanium dioxide particles having a finish from raw titanium dioxide particles comprising:
- preparing an aqueous slurry of raw titanium dioxide particles;
- treating the slurry with finishing chemicals to produce a treated slurry comprising titanium dioxide particles having a finish and byproduct salts;
- treating the treated slurry with demineralizing resins in their proton and hydroxide forms to produce a slurry of substantially salt-free titanium dioxide particles having a finish and mixed bed demineralizing resins in salt forms;
- and
- recovering the substantially salt-free titanium dioxide particles having a finish from the mixed bed demineralizing resins in salt forms.
Dependencies are inferred from the claim text.