Claims
- 1. Process for beneficiating particulate titanium-bearing material containing iron oxides comprising:
- (a) subjecting said particulate titanium-bearing material to reducing conditions at a temperature of about 900-1100 degrees C., in the presence of particulate carbonaceous reducing material to convert about 20-90 percent of the iron oxides to metallic iron,
- (b) feeding the products resulting from step (a) to a mechanical reduction kiln and contacting said products with particulate carbonaceous reducing material, and HCl or one or more materials which will produce HCl during step (b) or mixtures thereof,
- said contacting taking place in the substantial absence of titanium chlorination and while (i) the mechanical reduction kiln turns and cascades the material therein, (ii) a temperature of about 900-1100 degrees C. is maintained, and (iii) reducing conditions are maintained,
- said particulate titanium-bearing material having a mean diameter of less than about 40 microns, which diameter exists in the ore which is introduced into the kiln or is ground in the kiln to have such diameter,
- said step (b) causing iron oxide to be converted to metallic iron and causing liberation of the metallic iron from the titanium bearing material,
- said contacting continuing until the metallic iron produced in step (b) by said conversion and liberation has a mean diameter of at least about 50 microns,
- (c) removing the resulting products from step (b) from the kiln, and
- (d) separating the particulate metallic iron and titanium-bearing material from the resulting products from step (c).
- 2. The process of claim 1 wherein HCl is introduced to the kiln in step (b).
- 3. The process of claim 1 wherein one or more materials are introduced to the kiln that will produce HCl during step (b).
- 4. The process of claim 1 wherein the titanium-bearing material is ilmenite and the carbonaceous reducing material of step (b) is lignite or lignite char.
- 5. The process of claim 1 wherein the mechanical reduction kiln contains grinding media.
- 6. The process of claim 1 wherein HCl is present in step (b) in an amount sufficient to exert a partial pressure of 0.05 to 0.9 atmospheres.
- 7. The process of claim 1 wherein the particulate titanium-bearing material has been prereduced to convert about 20 to 90 percent of the iron to metallic iron; the titanium-bearing material is ilmenite; and the mechanical reduction kiln contains grinding media.
- 8. The process of claim 7 wherein HCl is added to the kiln of step (b) in an amount sufficient to exert a partial pressure of 0.1 to 0.6 atmospheres.
- 9. The process of claim 7 wherein one or more materials are introduced to the kiln that will produce sufficient HCl during step (b) to exert a partial pressure of 0.1 to 0.6 atmospheres.
Parent Case Info
This is a continuation of Ser. No. 08/376,474 filed Jan. 20, 1995, now abandoned, which is a continuation of Ser. No. 08/232,316 filed Apr. 25, 1994, now abandoned, which is a continuation of Ser. No. 07/886,310 filed May 21, 1992, now abandoned, which is a continuation-in-part of Ser. No. 07/650,498 filed Feb. 5, 1991, now abandoned, which is a continuation of Ser. No. 07/430,892 filed Oct. 31, 1989, now abandoned.
US Referenced Citations (8)
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Continuations (4)
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376474 |
Jan 1995 |
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232316 |
Apr 1994 |
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886310 |
May 1992 |
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430892 |
Oct 1989 |
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Continuation in Parts (1)
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650498 |
Feb 1991 |
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