Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Group ivb metal
Patent
1978-12-08
1979-09-18
Hearn, Brian
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Group ivb metal
423 82, 423 85, 423139, 423611, C01G 2306, C01G 4910
Patent
active
041682971
ABSTRACT:
An improved process is described for producing titanium dioxide from ilmenite-type ore. The ore is digested with aqueous hydrogen fluoride, the resulting liquid mixture treated with a water-soluble oxidizing agent, and the ferric iron impurities, in the resulting digestion solution, at a pH between about 1.0 and 6.0, are extracted out with a mono-or dialkyl, or mono- or di-(alkylphenyl) orthophosphoric acid, such as di-(2-ethylhexyl) orthophosphoric acid. The remaining solution is treated with ammonium hydroxide to precipitate hydrated titanium dioxide which is then calcined to form pigmentary titanium dioxide. Alkali metal and ammonium salts of the organophosphoric acid are also useful in the process.
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Liu Kang-Jen
Nagasubramanian Krishnamurthy
Allied Chemical Corporation
Harman Robert A.
Hearn Brian
North Robert J.
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