28-02-2009 дата публикации
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Номер заявки: 75-04-20090
Дата заявки: 14-11-2003
[1]UK Patent Application ™GB ,,,2 411 170 mA (43) Date of Printing by UK Office 24.08.2005 (21) Application No: 0509741.5 (51) INTCL7: C01G 7/00 5/00 55/00 , C22B 3/04 3/20 (22) Date of Filing: 14.11.2003 (52) UK CL (Edition X): (30) Priority Data: CIA AD46 AG 19 AG19D46 AG23 AG23D46 AG25 (31) 60426343 (32) 15.11.2002 (33) US AG25D46 AG26 AG26D46 AG28 AG28D46 AG29 (31) 10713640 (32) 13.11.2003 AG29D46 AGS AG3D46 AG6 AG6D46 APDT (86) International Application Data: PCT/IB2003/006475 En 14.11.2003 (56) Documents Cited by ISA: Not yet advised (87) International Publication Data: WO2004/046036 En 03.06.2004 (58) Field of Search by ISA: Other: Not yet advised (71) Applicant(s): Placer Dome Technical Services Limited(Incorporated in Canada)1600-1055 Dunsmuir Street, Vancouver,British Columbia, Canada (continued on next page) (21) Application No: 0509741.5 (51) INTCL7: C01G 7/00 5/00 55/00 , C22B 3/04 3/20 (22) Date of Filing: 14.11.2003 (52) UK CL (Edition X): (30) Priority Data: CIA AD46 AG 19 AG19D46 AG23 AG23D46 AG25 (31) 60426343 (32) 15.11.2002 (33) US AG25D46 AG26 AG26D46 AG28 AG28D46 AG29 (31) 10713640 (32) 13.11.2003 AG29D46 AGS AG3D46 AG6 AG6D46 APDT (86) International Application Data: PCT/IB2003/006475 En 14.11.2003 (56) Documents Cited by ISA: Not yet advised (87) International Publication Data: WO2004/046036 En 03.06.2004 (58) Field of Search by ISA: Other: Not yet advised (71) Applicant(s): Placer Dome Technical Services Limited(Incorporated in Canada)1600-1055 Dunsmuir Street, Vancouver,British Columbia, Canada (continued on next page) (54) Abstract Title: Method for thiosulfate leaching of precious metal-containing materials (57) Processes are provided for recovering precious metals from refractory materials using thiosulfate lixiviants. The processes can employ heap leaching or lixiviants that include one or more blinding agents.
[2]2.PmfvMUtmrL_/* Md/bqi* *v_^-*J| 8MrtigScM198 199oDOOOriginal Printed on Recycled PaperGB 2411170 A continuation (72) Inventor(s): Ralph Peter HacklJinxing JiPaul George West-Sells (74) Agent and/or Address for Service: Maguire Boss5 Crown Street, ST IVES, Cambridgeshire, PE27 5EB, United Kingdom
[3]Processes are provided for recovering precious metals from refractory materials using thiosulfate lixiviants. The processes can employ heap leaching or lixiviants that include one or more blinding agents.
1. A process for recovering a precious metal from a metal-containing material, comprising:
(a) contacting a metal-containing material with thiosulfate to form a pregnant leach solution comprising thiosulfate and at least a portion of the metal in the metal-containing material;
(b) contacting the pregnant leach solution and/or a solution derived therefrom with a sulphide reagent to form a precipitate-containing slurry comprising the metal sulphide precipitates and elemental sulphur; and
(c) contacting at least one of the precipitate-containing slurry and the metal precipitates with a sulfite reagent to convert at least most of the elemental sulphur into thiosulfate.
2. The process of claim 1, further comprising, before step (c):
(d) separating the metal precipitates from the precipitate-containing slurry and wherein the metal precipitates are contacted with the sulfite reagent.
3. The process of claim 1, wherein the metal is a precious metal and further comprising:
(d) separating a liquid phase of the product of step (c) from a solid phase thereof, wherein the liquid phase comprises at least most of the thiosulfate in the product and the solid phase comprises at least most of the metal in the product.
4. The process of claim 3, further comprising:
(e) recycling the liquid phase to the contacting step (a).
5. The process of claim 3, wherein the solid phase comprises first and second metals and further comprising:
(e) contacting the solid phase with at least one of a mineral acid and an oxidant other than the mineral acid to precipitate the first metal but not the second metal; and
(f) separating the precipitated first metal from the dissolved second metal.
6. The process of claim 5, wherein the first metal is a base metal and the second metal is a precious metal.
7. A metal recovered by the process of claim 1.