RECOVERING METALS FROM COMPLEX METAL SULFIDES
First Claim
1. A method of recovering metals from finely divided metal sulfides containing a Group VIB metal, a Group VB metal, and a Group VIII metal, the method comprising the steps of:
- contacting the finely divided metal sulfides with a leaching solution containing ammonia and air to dissolve the Group VIB metal and the Group VIII metal into the leaching solution at a sufficient temperature and pressure to form a pressure leach slurry containing at least a Group VIB soluble metal complex and at least a Group VIII soluble metal complex and solid residue containing at least a Group VB metal complex;
separating and removing the solid residue containing the Group VB metal complex from the pressure leach slurry, forming a pressure leach solution;
mixing the pressure leach solution with an additive selected from the group consisting of a mineral acid, a sulfide-containing compound, and a sulphur compound under mixing conditions at a temperature in the range of 50 to 90°
C. for a sufficient amount of time to precipitate at least a portion of the Group VIB metal and at least a portion of the Group VIII metal, wherein the precipitation is carried out at a first pre-selected pH to precipitate as metal complexes at least a portion of the Group VIB metal and at least a portion of the Group VIII metal.
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Accused Products
Abstract
Methods for recovering base metals, including, among other metals, molybdenum and nickel, from metal sulfides containing a Group VIB metal and a Group VIII metal. Generally, the methods comprise: contacting metal sulfides with a leaching solution containing ammonia and air to dissolve the metals into the leaching solution, forming a slurry containing soluble complexes of the metals, ammonium sulphate and solid residue containing ammonium metavanadate and any carbonaceous materials. The solid residue containing ammonium metavanadate and carbonaceous materials is then separated from the slurry and metal complexes are precipitated from the slurry by adjusting the pH. A second slurry may be formed comprising a second solid residue and a primary filtrate comprising ammonium sulfate solution that is substantially free of metals. The second solid residue is separated from the primary filtrate comprising ammonium sulfate by any means suitable for separation of solids from liquids and is then dissolved, at a second pre-selected pH, to form a Group VIB metal precipitate and a Group VIII metal containing solution. Group VIB and Group VIII metals can be easily recovered from the precipitate and solution, respectively. In some embodiments Group VB metals are recovered as well.
87 Citations
73 Claims
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1. A method of recovering metals from finely divided metal sulfides containing a Group VIB metal, a Group VB metal, and a Group VIII metal, the method comprising the steps of:
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contacting the finely divided metal sulfides with a leaching solution containing ammonia and air to dissolve the Group VIB metal and the Group VIII metal into the leaching solution at a sufficient temperature and pressure to form a pressure leach slurry containing at least a Group VIB soluble metal complex and at least a Group VIII soluble metal complex and solid residue containing at least a Group VB metal complex; separating and removing the solid residue containing the Group VB metal complex from the pressure leach slurry, forming a pressure leach solution; mixing the pressure leach solution with an additive selected from the group consisting of a mineral acid, a sulfide-containing compound, and a sulphur compound under mixing conditions at a temperature in the range of 50 to 90°
C. for a sufficient amount of time to precipitate at least a portion of the Group VIB metal and at least a portion of the Group VIII metal, wherein the precipitation is carried out at a first pre-selected pH to precipitate as metal complexes at least a portion of the Group VIB metal and at least a portion of the Group VIII metal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 71)
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17. A method of recovering metals from finely-divided metal sulfides, the method comprising the steps of:
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contacting the finely-divided metal sulfides with a leaching solution containing ammonia and air to dissolve the Group VIB metal and the Group VIII metal into the leaching solution at a sufficient temperature and pressure to form a pressure leach slurry containing at least a Group VIB soluble metal complex and at least a Group VIII soluble metal complex, ammonium sulfate and solid residue containing at least a Group VB metal complex; separating and removing the solid residue containing the Group VB metal complex from the pressure leach slurry forming a pressure leach solution; mixing from the pressure leach solution with an additive selected from the group consisting of a mineral acid, a sulfide-containing compound, and a sulphur compound under mixing conditions at a temperature in the range of 50 to 90°
C. for a sufficient amount of time to precipitate at least a portion of the Group VIB metal and at least a portion of the Group VIII metal, wherein the precipitation being carried out at a first pre-selected pH to precipitate as metal complexes at least a portion of the Group VIB metal and at least a portion of the Group VIII metal;wherein the finely-divided metal sulfides contain at least a group VB metal, a Group VIII non-noble metal, a group VIB metal selected from Mo and W and combination thereof. - View Dependent Claims (18, 19, 20)
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21. A method of recovering metals including vanadium from finely divided metal sulfides, the method comprising the steps of:
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contacting the finely divided metal sulfides with a leaching solution containing ammonia and air to dissolve the Group VIB metal and the Group VIII metal into the leaching solution at a sufficient temperature and pressure to form a pressure leach slurry containing at least a group VIB soluble metal complex and at least a group VIII soluble metal complex, ammonium sulfate and solid residue containing at least a Group VB metal complex; separating and removing the solid residue containing ammonium metavanadate and coke from the pressure leach slurry forming a pressure leach solution; mixing the pressure leach solution with an additive selected from the group consisting of a mineral acid, a sulfide-containing compound, and a sulphur compound under mixing conditions at a temperature in the range of 50 to 90°
C. for a sufficient amount of time to precipitate at least a portion of the Group VIB metal and at least a portion of the Group VIII metal, wherein the precipitation being carried out at a first pre-selected pH to precipitate as metal complexes at least a portion of the Group VIB metal and at least a portion of the Group VIII metal;recovering the metal complexes by filtration, forming a first supernatant containing 0.1 to 3% of the Group VIB metal in the spent dispersed catalyst for metal recovery, 1 to 20% of the Group VB metal in the spent dispersed catalyst for metal recovery, and 1 to 35% of the Group VIII metal in the spent dispersed catalyst for metal recovery; precipitating from the first supernatant at least a portion of the Group VIB metal and at least a portion of the Group VIII metal, wherein the precipitation being carried out at a second pre-selected pH to precipitate as metal complexes at least 95% of the Group VIB metal and at least 95% of the Group VIII metal initially present in the first supernatant prior to the precipitation at the second pre-selected pH; and recovering the Group VIB and group VIII metal sulfides by filtration, forming a second supernatant containing less than 100 ppm of the group VIB metal, less than 20 ppm of the Group VIII metal, and less than 100 ppm of the group VB metal.
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22. A method for recovering metals from metal bearing materials comprising:
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(a) leaching finely divided sulfides of a Group VIB metal and a Group VIII metal with an ammonia containing leach solution at a temperature and a pressure sufficient to form a pressure leach slurry comprising at least a Group VIB soluble metal complex and at least a Group VIII soluble metal complex and a first solid residue; (b) separating and removing the first solid residue from the pressure leach slurry to form a first pressure leach solution comprising the Group VIB soluble metal complex and the Group VIII soluble metal complex; (c) precipitating from the first pressure leach solution, at a first pre-selected pH, a second solid residue comprising at least a portion of the Group VIB soluble metal complex to form a first slurry comprising the second solid residue and at least a portion of the Group VIII soluble metal complex; (d) separating from the first slurry, the second solid residue and a primary filtrate substantially free of Group VIB and the Group VIII metals; (e) dissolving the second solid residue at a second pre-selected pH to form a group VIB metal precipitate and a group VIII metal containing solution; (f) separating the group VIB metal precipitate from the Group VIII metal containing solution; and (g) dissolving said Group VIB metal precipitate in a dilute base at a sufficient temperature to form a Group VIB soluble metal product. - View Dependent Claims (23, 24, 25, 26, 34, 35, 36, 37, 38, 39, 40, 41, 42)
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27. A method for recovering metals from metal bearing materials comprising:
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(a) leaching finely divided sulfides of a Group VB metal, a Group VIB metal and a Group VIII metal with an ammonia containing leach solution at a temperature and a pressure sufficient to form a pressure leach slurry comprising at least a Group VIB soluble metal complex and at least a Group VIII soluble metal complex and a first solid residue; (b) separating and removing the first solid residue from the pressure leach slurry to form a first pressure leach solution comprising the Group VIB soluble metal complex and the Group VIII soluble metal complex; (c) precipitating from the first pressure leach solution, at a first pre-selected pH, a second solid residue comprising at least a portion of the Group VIB soluble metal complex to form a first slurry comprising the second solid residue and at least a portion of the Group VIII soluble metal; (d) separating from the first slurry, the second solid residue and a primary filtrate substantially free of Group VB, Group VIB and the Group VIII metals; (e) dissolving the second solid residue at a second pre-selected pH to form a group VIB metal precipitate and a group VIII metal containing solution; (f) separating the group VIB metal precipitate from the Group VIII metal containing solution; (g) dissolving said Group VIB metal precipitate in a dilute base at a sufficient temperature to form a Group VIB soluble metal product. (h) recovering from step (f) a secondary filtrate comprising the Group VIII metal containing solution having substantially the Group VIII soluble metal complex and a trace amount of Group VB and Group VIB metals; (i) combining the secondary filtrate with the primary filtrate from step (d) to form a combined filtrate comprising substantially the Group VIII soluble metal complex and a trace quantity of Group VB and Group VIB metals; (j) precipitating from the combined filtrate the Group VB, Group VIB and Group VIII metals in a sulfidation process to form a third solid residue and a tertiary filtrate; and (k) separating the third solid residue from the tertiary filtrate and dissolving the third solid residue to form a group VIII metal product solution. - View Dependent Claims (28, 29, 30, 31, 32, 33, 43, 44, 45)
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46. A method for recovering metals from metals bearing materials comprising:
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(a) leaching finely divided sulfides of a Group VIB metal and a Group VIII metal with an ammonia containing leach solution at a temperature and a pressure sufficient to form a pressure leach slurry comprising at least a Group VIB soluble metal complex and at least a Group VIII soluble metal complex and a first solid residue; (b) separating and removing the first solid residue from the pressure leach slurry to form a first pressure leach solution comprising the Group VIB soluble metal complex and the Group VIII soluble metal complex; (c) precipitating from the first pressure leach solution, at a first pre-selected pH, a second solid residue comprising at least a portion of the Group VIB soluble metal complex to form a first slurry comprising the second solid residue and at least a portion of the Group VIII soluble metal complex; (d) separating from the first slurry, the second solid residue and a primary filtrate substantially free of Group VIB and the Group VIII metals; (e) dissolving the second solid residue at a second pre-selected pH to form a group VIB metal precipitate and a group VIII metal containing solution; (f) separating the group VIB metal precipitate from the Group VIII metal containing solution; (g) dissolving said Group VIB metal precipitate in a dilute base at a sufficient temperature to form a Group VIB soluble metal product; (h) forming a secondary filtrate comprising substantially ammonium sulphate, the Group VIII soluble metal complex and trace amounts of the Group VIB metals; (i) processing the primary filtrate in a primary precipitation method to form a primary solid residue and a primary liquid fraction and separately processing the secondary filtrate in a secondary precipitation method to form a secondary solid residue and a secondary liquid fraction; (j) separating the primary solid residue from the primary liquid fraction and feeding the primary solid residue to step (a); and (k) separating the secondary solid residue from the secondary liquid fraction and dissolving the secondary solid residue to form a Group VIII product solution. - View Dependent Claims (47, 48, 49, 50, 51, 54, 56, 57, 59, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 72, 73)
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52. A method for recovering metals from metals bearing materials comprising:
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(a) leaching finely divided sulfides of a Group VB metal, a Group VIB metal and a Group VIII metal with an ammonia containing leach solution at a temperature and a pressure sufficient to form a pressure leach slurry comprising at least a Group VIB soluble metal complex and at least a Group VIII soluble metal complex and a first solid residue; (b) separating and removing the first solid residue from the pressure leach slurry to form a first pressure leach solution comprising the Group VIB soluble metal complex and the Group VIII soluble metal complex; (c) precipitating from the first pressure leach solution, at a first pre-selected pH, a second solid residue comprising at least a portion of the Group VIB soluble metal complex to form a first slurry comprising the second solid residue and at least a portion of the Group VIII soluble metal complex; (d) separating from the first slurry the second solid residue and a primary filtrate substantially free of Group VB, Group VIB and the Group VIII metals; (e) dissolving the second solid residue at a second pre-selected pH to form a group VIB metal precipitate and a group VIII metal containing solution; (f) separating the group VIB metal precipitate from the Group VIII metal containing solution; (g) dissolving said Group VIB metal precipitate in a dilute base at a sufficient temperature to form a Group VIB soluble metal product; (h) forming a secondary filtrate comprising substantially ammonium sulphate, the Group VIII soluble metal complex and trace amounts of Group VB and Group VIB metals; (i) processing the primary filtrate in a primary precipitation method to form a primary solid residue and a primary liquid fraction and separately processing the secondary filtrate in a secondary precipitation method to form a secondary solid residue and a secondary liquid fraction; (j) separating the primary solid residue from the primary liquid fraction and feeding the primary solid residue to step (a); and (l) separating the secondary solid residue from the secondary liquid fraction and dissolving the secondary solid residue to form a Group VIII product solution. - View Dependent Claims (53, 55, 58, 60)
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Specification