Specialized metallurgical processes – compositions for use therei – Processes – Electrothermic processes
Patent
1973-09-18
1977-04-12
Stern, Edward
Specialized metallurgical processes, compositions for use therei
Processes
Electrothermic processes
423 76, 423 79, 423415R, 423492, C22B 510, C01G 2302, C01B 3118, C21B 1500
Patent
active
040173046
ABSTRACT:
A reduction/chlorination process is provided for the treatment of titaniferous materials such as ilmenite ores. The chlorination is selective in that the titanium constituent of the titaniferous material is chlorinated, but there is no appreciable net yield of iron chloride from the iron constituent. Where other metals such as vanadium are present they may be chlorinated with the titanium. The reduction utilizes as the reductant an amount of carbonaceous material which, based on oxygen in the titaniferous material, is at least stoichiometric to produce carbon monoxide. The selective chlorination utilizes as the chlorinating agent either ferrous chloride (FeCl.sub.2) alone or certain combinations of ferrous chloride and one or more other chlorine-containing members, notably molecular chlorine (Cl.sub.2) and hydrogen chloride (HCl). The use of ferric chloride (FeCl.sub.3) as a part or all of the chlorinating agent is the equivalent of using a FeCl.sub.2 /0.5 Cl.sub.2 mixture. Preferably, sufficient chlorine atoms are provided by the chlorinating agent to react with essentially all of the titanium in the titaniferous material. An elevated temperature in the range of 950.degree. to 1400.degree. C. is maintained during the chlorination, but depending upon the composition of the chlorinating agent, there may be a minimum temperature in the range which is needed to maintain selectivity.
REFERENCES:
patent: 2589466 (1952-03-01), Wilcox
patent: 2802721 (1957-08-01), Cooper
patent: 2970887 (1961-02-01), Hill
patent: 3359065 (1967-12-01), Zirngibl et al.
patent: 3495936 (1970-02-01), Jones, Jr.
patent: 3859077 (1975-01-01), Othmer
J. Barksdale's book "Titanium", 1966, Second Edition, p. 417, The Ronald Press Co., New York.
E. I. Du Pont de Nemours and Company
Stern Edward
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