A METHOD FOR PREPARING A LEACH FEED MATERIAL
First Claim
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1. A method for preparing a leach feed material, the method comprising the steps of:
- passing an ore or concentrate containing vanadium and iron to a reduction step to form a reduced ore or concentrate; and
passing the reduced ore or concentrate to a ferric leach step to produce a ferric leachate containing iron and a ferric leach residue containing vanadium,whereafter the ferric leach residue is used as a leach feed material for extracting and recovering vanadium.
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Abstract
A method (10) for preparing a leach feed material, the method (10) comprising the steps of:
- passing an ore or concentrate containing vanadium and iron to a reduction step (12) to form a reduced ore or concentrate; and
- passing the reduced ore or concentrate to a ferric leach step (14) to produce a ferric leachate containing iron and a ferric leach residue containing vanadium,
wherein the ferric leach residue is suitable for use as the leach feed material for extracting and recovering vanadium.
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Citations
25 Claims
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1. A method for preparing a leach feed material, the method comprising the steps of:
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passing an ore or concentrate containing vanadium and iron to a reduction step to form a reduced ore or concentrate; and passing the reduced ore or concentrate to a ferric leach step to produce a ferric leachate containing iron and a ferric leach residue containing vanadium, whereafter the ferric leach residue is used as a leach feed material for extracting and recovering vanadium. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 18, 19, 20, 21, 22, 23, 24)
b. about 2 hours.
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8. The method according to claim 1, wherein the reduction step is conducted using reformed natural gas.
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9. The method according to claim 1, wherein the percentage of metallised iron in the reduced ore or concentrate is between about 50 to 100%.
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10. The method according to claim 1, wherein the ferric leach step is conducted with ferric chloride.
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11. The method according to claim 10, wherein the concentration of ferric chloride ranges between:
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a. about 20 to 40% w/w; b. about 25 to 35% w/w;
orc. about 35% w/w.
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12. The method according to claim 1, wherein the ferric leach step is conducted at a temperature ranging between:
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a. about 25°
C. to 100°
C. under atmospheric pressure;
orb. about 60°
C. to 80°
C. under atmospheric pressure.
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13. The method according to claim 1, wherein the residence time of the ferric leach step ranges between:
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a. about 1 to 5 hours;
orb. about 1 to 3 hours.
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14. The method according to claim 1, wherein solids content during the ferric leach step ranges between:
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a. about 5 to 20% w/w;
orb. about 8 to 14% w/w.
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15. The method according to claim 1, wherein the method further comprises the step of:
passing the ferric leach residue to a hydrochloric acid leach step to produce an acid leachate containing vanadium and an acid leach residue.
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16. The method according to claim 15, wherein the acid leach residue contains titanium.
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18. The method according to claim 15, wherein the concentration of HCl acid ranges between:
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a. about 15% to 32% (w/w);
orb. about 15% to 20%.
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19. The method according to claim 15, wherein the acid leach step is conducted under atmospheric pressure at a temperature ranging between:
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a. about 25°
C. to 100°
C.;
orb. about 60°
C. to 80°
C.
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20. The method according to claim 15, wherein the acid leach step conducted under pressure is conducted at a temperature ranging between:
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a. about 120°
C. to 160°
C.;
orb. about 140°
C. and 160°
C.
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21. The method according to claim 15, wherein the residence time of the acid leach step conducted under atmospheric pressure ranges between:
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a. about 0.5 to 10 hours;
orb. about 6 and 8 hours.
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22. The method according to claim 15, wherein the acid leach step conducted under pressure has a residence time ranging between:
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a. about 0.5 to 4 hours;
orb. about 0.5 to 2 hours.
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23. The method according to claim 15, wherein the solids content during the acid leach step ranges between:
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a. about 10 to 30% w/w;
orb. about 15 to 20% w/w.
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24. The method according to claim 15, wherein the free acid concentration at the end of the acid leach step ranges between about 10 to 40 g/L.
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17. (canceled)
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25-39. -39. (canceled)
Specification