Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Group ivb metal
Patent
1977-11-14
1978-08-15
Hearn, Brian
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Group ivb metal
423 83, 423 85, 423 86, 423143, 423612, 204180P, C01G 2304
Patent
active
041072642
ABSTRACT:
An improved process is described for recovering TiO.sub.2, useful as a white pigment, from ilmenite-type ores, including the steps of digesting the ore with aqueous hydrofluroic acid, separating out iron impurities from the resulting solution, precipitating hydrated titanium dioxide from the iron-free solution with ammonium hydroxide, and calcining the precipitate to obtain pigmentary TiO.sub.2, wherein the improvement comprises subjecting aqueous solutions of by-product ammonium fluoride, formed in the process, to electrodialytic water-splitting to form an aqueous solution of ammonium hydroxide and an aqueous solution of hydrogen fluoride and recycling said aqueous ammonium hydroxide to the precipitation step and said aqueous hydrogen fluoride to the digestion step.
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patent: 3788959 (1974-01-01), Smith
Liu Kang-Jen
Nagasubramanian Krishnamurthy
Allied Chemical Corporation
Harman Robert A.
Hearn Brian
North Robert J.
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