AU2007266303B2 - Process for recovering metals from resins - Google Patents
Process for recovering metals from resins Download PDFInfo
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- AU2007266303B2 AU2007266303B2 AU2007266303A AU2007266303A AU2007266303B2 AU 2007266303 B2 AU2007266303 B2 AU 2007266303B2 AU 2007266303 A AU2007266303 A AU 2007266303A AU 2007266303 A AU2007266303 A AU 2007266303A AU 2007266303 B2 AU2007266303 B2 AU 2007266303B2
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- AU
- Australia
- Prior art keywords
- sulphite
- eluent system
- elution
- eluent
- bisulphite
- Prior art date
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B11/00—Obtaining noble metals
- C22B11/04—Obtaining noble metals by wet processes
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B3/00—Extraction of metal compounds from ores or concentrates by wet processes
- C22B3/04—Extraction of metal compounds from ores or concentrates by wet processes by leaching
- C22B3/06—Extraction of metal compounds from ores or concentrates by wet processes by leaching in inorganic acid solutions, e.g. with acids generated in situ; in inorganic salt solutions other than ammonium salt solutions
- C22B3/08—Sulfuric acid, other sulfurated acids or salts thereof
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B3/00—Extraction of metal compounds from ores or concentrates by wet processes
- C22B3/20—Treatment or purification of solutions, e.g. obtained by leaching
- C22B3/42—Treatment or purification of solutions, e.g. obtained by leaching by ion-exchange extraction
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Manufacturing & Machinery (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Inorganic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Treatment Of Water By Ion Exchange (AREA)
Abstract
A process for recovering metals involving ion exchange comprising the step of recovering metal species from an ion exchange resin by elution of the resin with an eluent system containing (i) a first sulphite component comprising at least one of sulphite and bisulphite ion; and (ii) a second eluting component comprising any species which favours the ion exchange or desorption of a metal species from the resin during elution wherein the presence of the sulphite component (i) increases metal elution efficiency relative to the situation where an eluent comprises the second eluting component alone.
Description
WO 2007/137325 PCT/AU2007/000702 1 PROCESS FOR RECOVERING METALS FROM RESINS This invention relates to a process for recovering metals involving ion exchange. Gold is usually recovered using a cyanidation leach process which 5 involves leaching followed by recovery from solution using activated carbon. Thiosulphate leaching is a potential environmentally acceptable alternative to cyanidation and, in this process, the gold is leached as the gold thiosulphate complex. However, this complex is not readily adsorbed by activated carbon and so anion exchange resins may be preferred. 10 Gold may be loaded onto resins from either a slurry or a solution, but then the gold must be recovered from the resin by elution or desorption with organic or inorganic eluents or eluent systems. Gold can be eluted from resins using eluents such as thiocyanate, polythionate or nitrate based eluents. However, relatively concentrated solutions are required for the elution process. For 15 example, in a nitrate elution process, 2M ammonium nitrate is preferred as disclosed in PCT Application No. WO 01/23626 (Murdoch University). This is a relatively high concentration of nitrate that creates demonstrable cost implications for the elution step. Thiocyanate solutions are known to rapidly elute gold (either cyanide or 20 thiosulphate complexes) from resins. However, the resin must be regenerated prior to addition back into the resin in pulp circuit, otherwise the thiocyanate will accumulate in process water, eventually leading to environmental problems and reduced gold loading. In addition, the loss of thiocyanate may be economically unacceptable. Regeneration in the thiocyanate system is also complicated as 25 thiocyanate is removed using ferric sulphate followed by regeneration of thiocyanate by addition of sodium hydroxide. This may lead to resin breakage from osmotic shock due to the swing in pH from elution to regeneration. A number of chemical reagents are also required at a plant site that may be remote. It is therefore desirable, subject to plant operational efficiency, to reduce the 30 inventory of different chemicals used in plant operation. An aim is to use fewer reagents in lesser quantity. A polythionate eluent system utilises a mixture of trithionate and tetrathionate. Since these species are strongly adsorbed on a resin, they can be 2 used to effectively elute gold. However, the resin requires regeneration due to the high affinity of the polythionates for the resin. Regeneration is accomplished by treating the resin with sulphide ions to convert the polythionates to thiosulphate. A problem with polythionate elution is the stability of the solution. Tetrathionate 5 undergoes a decomposition reaCtion to form trithionate and elemental sulphur, and in the presence of silver or copper, decomposes to precipitate copper or silver sulphides. Trithionate decomposes to form sulphate and sulphur. Such decomposition reactions result in losses that add to the cost of the process. It is an object of the present invention to provide a process for recovery of 10 metals by ion exchange which increases elution efficiency over conventional eluents with desirably lesser cost in terms of reagents, regeneration steps, inventory costs and the like. With this object in view, the present invention provides a process for recovering metals involving ion exchange comprising the step of recovering metal 15 species from an ion exchange resin by elution of the resin with an eluent system containing (i) a first sulphite component comprising at least one of sulphite and bisulphite ion; and (ii) a second eluting component comprising any species, particularly an anionic species, which favours the ion exchange or desorption of a metal species from the resin during elution wherein the presence of the sulphite 20 component (i) increases metal elution efficiency relative to the situation where an eluent comprises the second eluting component alone. Strong base ion exchange resins are useful resins for the practice of the invention. According to a preferred embodiment of the present invention, there is provided a process for recovering metals involving ion exchange comprising the 25 step of recovering metal species from an ion exchange resin by elution of the resin with an eluent system containing (i) a first sulphite component comprising at least one of sulphite and bisulphite ion; and (ii) a second eluting component comprising at least one ionic species selected from the group consisting of halide, nitrate and thiocyanate anionic species wherein the presence of the sulphite 30 component (i) increases metal elution efficiency relative to the situation where an eluent comprises the second eluting component alone. The process is particularly applicable to the elution of gold (and other precious metals) and may also be applied to other metals including base metal 2a such as copper. It may be applied as an adjunct to any leach or other hydrometallurgical process for the extraction of such metals, including resin-in pulp processes or other ion exchange unit operations. The process may be particularly advantageously applied to leached metal recovery following a 5 thiosulphate leach process. In this aspect, there may be provided a process for recovering precious metals comprising the steps of: WO 2007/137325 PCT/AU2007/000702 3 (a) leaching a precious metal containing material with a thiosulphate solution; (b) recovering leached precious metals by ion exchange with an ion exchange resin; and 5 (c) eluting the ion exchange resin with an eluent system containing (i) a sulphite component including at least one of sulphite and bisulphite ion in combination with (ii) a second eluting component containing an ionic species selected from the group consisting of halide, nitrate, polythionate and thiocyanate ionic 10 species. The process may also be applied to ion exchange for metal recovery following other hydrometallurgical processes. Sulphite assisted elution involves elution of the ion exchange resin with an eluent that contains sulphite or bisulphite ion available as metal salts such as 15 alkali metal salts (Na, K, Li and so on); or as derived from sulphur dioxide gas or metabisulphite, or reaction of sulphite with acids, such as hydrochloric acid, or reaction of metabisulphite with bases, such as sodium hydroxide. Such ions are purposefully added to various eluent solutions including any species, such as at least one anionic species selected from the group consisting of halide such as 20 chloride, nitrate, polythionate such as trithionate, and thiocyanate with significant observable increases in the efficiency of metal elution, which may be measured in terms of bed volumes of eluent required to achieve a required level of metal elution from the resin. For instance, addition of sulphite to a trithionate eluent may result in a very high efficiency of gold elution, not observed with trithionate or 25 sulphite alone. Indeed, sulphite - on its own - is not typically an effective eluent. Therefore, addition of sulphite to eluents surprisingly enables use of lower concentration of reagents in eluent solutions and cost reductions in plant operation. Bisulphite could be added to the group of anionic species identified above, 30 for instance where it is not selected as sulphite component (i). The advantageous effects of sulphite addition may, without wishing to be bound by any theory, result from influence on speciation of the metal to be eluted, sulphite forming, potentially on interaction with the second eluting component, a WO 2007/137325 PCT/AU2007/000702 4 mixed complex metal species, such as a gold mixed thiosulphate-sulphite species in the case of a thiosulphate leach scheme, with less affinity for the resin. The second eluting component may include a solution of a single compound which may dissociate to form cation(s) and only one anionic species 5 selected from the group consisting of halide, nitrate, polythionate and thiocyanate, though other related or effective eluting anions may be selected. Eluent systems favoured for use in accordance with the present invention include systems containing sulphite and chloride ions. A particularly low cost effective eluent system involves addition of sulphite and/or bisulphite ion to a 10 sodium chloride solution, such as a brine solution. Water sources available to metal recovery plants, including precious metal recovery plants, are often saline. Thus, the chloride/sulphite eluent system is economically attractive. Other favoured systems include sulphite in combination with nitrate, for example in ammonium nitrate form. Ammonium nitrate is useful in mining and its use in 15 elution as well provides economic advantages as a lower inventory of chemicals can be maintained. Eluent systems to be used in the process are preferably simple and contain a minimal number of components, thus aiding in reduction of reagent and inventory costs. Advantageously, sulphite concentration in eluent is greater than 0.01 M and 20 is preferably in the range 0.05 - 1 M, allowing lower concentrations for the second eluting component than required for competing eluents resulting in cost advantages through lower reagent consumption. Eluent stability may be improved in the presence of sulphite ion. For example, when a loaded resin contains tetrathionate, an unstable species, 25 sulphite converts it to the more stable trithionate avoiding metal sulphide precipitation. The reaction scheme is as follows: S40 6 2- + SO 3 2 - <- -> S2032 + S306 2 Addition of sulphite to a trithionate (or polythionate) eluent is also beneficial because it reduces the formation of tetrathionate. 30 Sulphite ion may be added to the eluent system in admixture with bisulphite ion. A bisulphite-sulphite mixture or hydrosulphite solution, as formed for example - by reaction of sulphite and acid (for example hydrochloric acid), may itself be an effective eluent. In this aspect, the present invention provides an WO 2007/137325 PCT/AU2007/000702 5 eluent system containing hydrosulphite or a combination of (i) sulphite ions; and (ii) bisulphite ions, whether alone or in combination with other ionic species. Bisulphite is the protonated form of sulphite and hence the distribution of bisulphite and sulphite in solution is dependent on solution pH. The preferred pH 5 range is 4.5-8 under which conditions there is a mixture of sulphite and bisulphite. The concentration of bisulphite + sulphite contained in the eluent system should be at least 0.2M and is preferably in the range 0.5 - 2M. A bisulphite solution may be prepared by dissolving salts of bisulphite, metabisulphite or sulphite in water and adjusting pH using acid or alkali as 10 necessary. Multiple sources of sulphite and bisulphite are available. Alternatively, SO 2 may be dissolved in alkaline solutions. One of the major advantages of a bisulphite eluent compared to other eluents is that, following elution, the resin may not require a regeneration step. Gold leach solutions are typically alkaline and contain copper (II). When a resin loaded with bisulphite is 15 returned to leach, bisulphite converts to sulphite and is oxidised by copper (11) hence removing it from the resin. No regeneration is required. Further, as bisulphite is oxidised to sulphate, its accumulation in the process water circuit does not pose the same concern as would a nitrate elution system. 20 Regeneration may also be avoided where sulphite in combination with sodium chloride is used as an eluent. Sodium chloride is an inexpensive reagent and brines or saline water sources are abundant in many gold regions making its use advantageous. The metal recovery process of the present invention may be more fully 25 understood from the following description made with reference to the following figures in which: Figure 1 is a schematic diagram of a thiosulphate resin in pulp process. Figure 2 is an elution curve demonstrating elution of gold from an anion exchange resin by 2M sodium chloride (El) and 2M sodium chloride with 0.1M 30 sodium sulphite (E2); Figure 3 is an elution curve demonstrating elution of gold from an anion exchange resin by 0.5 M ammonium nitrate (E3); and 0.5 M ammonium nitrate in admixture with 0.1 M sodium sulphite (E4); WO 2007/137325 PCT/AU2007/000702 6 Figure 4 is an elution curve demonstrating elution of gold from an anion exchange resin by 1M ammonium nitrate (E5); and 1 M ammonium nitrate in admixture with 0.1 M sodium sulphite (E6); Figure 5 is an elution curve demonstrating elution of gold from an anion 5 exchange resin by 0.1 M trithionate (E7); and an admixture of 0.1 M trithionate with 0.1 M sodium sulphite (E8); Figure 6 is an elution curve demonstrating elution of gold from an anion exchange resin by 0.2 M trithionate (E9); and 0.2 M trithionate and 0.1 M sodium sulphite (E10). 10 Figure 7 is an elution curve demonstrating elution of gold from an anion exchange resin by hydrosulphite, or sulphite and bisulphite, a mixture of 1 M sodium sulphite and HCI adjusted to pH 6 to form bisulphite (El 1). Figure 8 is a comparative diagram providing elution curves for all sulphite containing eluents tested. 15 In a preferred embodiment of the invention, gold and other precious metals are recovered into solution at a metal recovery plant by a thiosulphate leaching process followed by ion exchange to recover gold thiosulfate complex present in pregnant leach liquor from the leach step as shown schematically in Figure 1. In the ion exchange step, a strong base anion exchange resin is used to 20 adsorb the gold thiosulphate complex. There are a number of commercially available strong base ion exchange resins which have an affinity to gold and which are useful for the ion exchange process. The functional group of most strong base resins is quaternary ammonium, R4N+. Such a resin, in sulphate or chloride form, is a Purolite A500 resin, as supplied by The Purolite Company of 25 Bala Cynwyd, Pennsylvania, which is employed in a preferred embodiment of the invention. Any other anion exchange resin may, however, be used to comparable effect. Following loading or adsorption of gold thiosulphate complex onto the resin, the gold must be recovered by elution; that is, desorbed. In the preferred 30 embodiment, gold, and other metal values, are eluted from the resin by an eluent system containing sulphite ion in a sulphite assisted elution process. More specifically, the eluent system contains (i) a first sulphite component comprising at least one of sulphite and bisulphite ion; and (ii) a second eluting component WO 2007/137325 PCT/AU2007/000702 7 comprising an anionic species which favours the ion exchange or desorption of a metal species from the resin during elution, the presence of the sulphite component (i) increasing the metal elution efficiency of the eluent relative to the situation where an eluent contains second eluting component alone. Various 5 eluents, taking the form of aqueous solutions, may be used for this purpose. For testing elution efficiency with various eluents, Purolite A500 resin was lightly packed into a glass column with a volume of 8 mL. Resin was loaded with gold thiosulphate, loading being achieved by shaking 10 g of clean resin in a 250 mL solution containing 250 mg/L Au, 0.1 M ammonium thiosulphate and 0.1 10 M ammonia overnight with low oxygen transfer. The eluents and eluent systems tested, non-exhaustively and by way of illustration, were as follows: El 2M sodium chloride E2 2M sodium chloride and 0.1M sodium sulphite 15 E3 0.5 M ammonium nitrate E4 0.5 M ammonium nitrate and 0.1 M sodium sulphite E5 1 M ammonium nitrate E6 1 M ammonium nitrate and 0.1 M sodium sulphite E7 0.1 M trithionate 20 E8 0.1 M trithonate and 0.1 M sodium sulphite E9 0.2 M trithionate E10 0.2 M trithionate and 0.1 M sodium sulphite El1 hydrosulphite, or sulphite and bisulphite, a mixture of 1 M sodium sulphite and HCI (pH 6) 25 In each case, sodium sulphite was used as a convenient source of sulphite ion. Other suitable metal sulphites are available and sulphur dioxide or metabisulphite may also be used as a source of sulphite. It will also be noted that each eluent system comprised at most two eluent components, this reducing inventory of chemicals required at the metal recovery plant. 30 A volume of 200 mL of each eluent or eluent system was pumped through the glass column at a speed of 5 bed volumes per hour (0.66 mL/min) with a fractional collector collecting 4 mL samples (0.5 bed volumes). 50 samples or 25 bed volumes were collected for each experiment. Samples were then diluted 20 WO 2007/137325 PCT/AU2007/000702 8 fold with 0.01 M NaCN and 0.05M Na 2
CO
3 before being analysed by atomic absorption spectroscopy. The results were plotted as the elution curves of Figures 2 to 8. Figure 2 shows elution performance for the first pair of eluents El and E2. 5 Greater than 95% of gold was eluted from the resin after 13 to 14 bed volumes of 2 M NaClI/0.1 M sodium sulphite eluent pumped through the column. As NaCl is a very inexpensive reagent, being commonly available in brines and saline water in gold mining regions, the elution efficiency achieved through addition of sulphite ion is both technically and commercially significant. 10 Figure 3 demonstrates elution performance for 0.5M ammonium nitrate alone; and 0.5M ammonium nitrate in combination with 0.1 M sodium sulphite (E3, E4). At a concentration of 0.5 M ammonium nitrate, 95% elution of gold could not be achieved under the test conditions yet, with 0.1 M sodium sulphite, greater than 95% gold elution was achieved by 20 bed volumes of eluent. A significant 15 change in elution efficiency is therefore achieved by addition of sulphite ion. Without wishing to be bound by any theory, it is apparent that the addition of sulphite to a nitrate system allows formation of a species which has less affinity for the strong base anion exchange resin and which is significantly more easily eluted than the species present in the 0.5 M ammonium nitrate system. 20 In Figure 4, showing performance for eluent pair E5, E6 the improvement resulting from increasing ammonium nitrate concentration to 1 M ammonium nitrate is seen. Still, much less than 95% gold elution is achieved even after 25 bed volumes of eluent have been pumped through the column. 0.1 M sodium sulphite addition, however, allowed greater than 95% gold elution by about 10 25 bed volumes of eluent, a significant improvement in performance. Comparative work for the 2M ammonium nitrate eluent system provided in PCT Application No. WO 01/23626 (Murdoch University) suggests that more than 30 bed volumes for 2M ammonium, sodium, potassium and nickel nitrate eluents will be required for greater than 95% gold recovery. Addition of sulphite ion, as taught by the present 30 invention, therefore surprisingly offers substantially improved performance and economy when applied to nitrate systems because much lower nitrate concentration may be adopted (0.5 M) than in prior art nitrate systems.
WO 2007/137325 PCT/AU2007/000702 9 Figure 5 shows the improvement for 0.1 M trithionate elution (E7) when 0.1 M sodium sulphite is added. Further, the mixture of trithionate and sulphite (E8) is advantageous over a simple trithionate solution, as the sulphite converts any tetrathionate loaded on the resin from leaching to trithionate by reaction scheme 5 [1] above. This prevents the formation of sulfur on the resin by reaction scheme 2 during the sulfide regeneration step which is required following trithionate elution.
S
4 0 6 2- + 2- <- -> 2S203 + S [2] Figure 6 is also directed to the trithionate/sulphite eluent system, except that, here, the concentration of trithionate is raised to 0.2 M in eluent E9 with 0.1 10 M sodium sulphite being present in eluent E10. Sulphite addition is observed to further enhance eluent performance, or increased metal elution efficiency as measured by a reduced number of bed volumes to achieve, for example, 95% metal elution over the result where trithionate concentration is simply increased. That is, acceptable to very high elution efficiency may be achieved by presence of 15 an effective amount of sulphite component (i) independently of increase in concentration of the second eluting component. This may have implications in terms of reducing trithionate usage and consequential costs for a given elution efficiency. Figure 7 shows elution performance for the hydrosulphite (1 M sodium 20 sulphite and HCI (pH 6) eluent system El 1, containing both sulphite and bisulphite ions, and showing greater than 95% elution of gold after 23 to 24 bed volumes of eluent have been pumped through the column. Finally, Figure 8 shows comparative elution performance for all the sulphite assisted eluent systems tested. The effect of sulphite ion on elution performance 25 in the nitrate system may be particularly noted. However, good elution efficiency is observed for all the sulphite assisted eluents tested. Modifications and variations to the metal recovery process of the invention may be apparent to the skilled reader of this disclosure. Such modifications and variations are deemed to be within the scope of the present invention.
Claims (21)
1. A process for recovering metals involving ion exchange comprising the step of recovering metal species from an ion exchange resin by elution of the resin with an eluent system containing (i) a first sulphite component comprising at 5 least one of sulphite and bisulphite ion; and (ii) a second eluting component comprising at least one ionic species selected from the group consisting of halide, nitrate and thiocyanate anionic species wherein the presence of the sulphite component (i) increases metal elution efficiency relative to the situation where an eluent comprises the second eluting component alone. 10
2. The process of claim 1 wherein the second eluting component of the eluent system comprises one ionic species selected from halide, nitrate and thiocyanate anionic species.
3. The process of claim 1 or 2 wherein the eluent system contains sulphite and chloride ions. 15
4. The process of claim 3 wherein the eluent system contains sodium sulphite and sodium chloride.
5. The process of claim 1 or 2 wherein the eluent system contains sulphite and nitrate ions.
6. The process of claim 5 wherein the eluent system contains sodium sulphite 20 and ammonium nitrate.
7. The process of any one of the preceding claims wherein sulphite concentration in the eluent system is greater than 0.01 M.
8. The process of claim 7 wherein sulphite concentration in the eluent system is in the range 0.05 to I M. 11
9. The process of any one of the preceding claims wherein acceptable elution efficiency is achieved by presence of an effective amount of the sulphite component (i) independently of increase of concentration of the second eluting component. 5
10. The process of claim 1 or 2 wherein the eluent system contains both sulphite and bisulphite ions.
11. The process of claim 10 wherein pH of the eluent system is maintained within the range 4.5 to 8.
12. The process of claim 10 or 11 wherein the combined concentration of 10 sulphite and bisulphite ion in the eluent system is at least 0.2M.
13. The process of claim 12 wherein the combined concentration of sulphite and bisulphite ions in the eluent system is in the range 0.5 to 2M.
14. The process of any one of the preceding claims wherein the ion exchange resin may be used following an elution operation without regeneration.
15 15. A process of any one of the preceding claims further comprising the steps of: a) leaching a precious metal containing material with a thiosulphate solution; and b) recovering leached precious metals by ion exchange with an ion 20 exchange resin.
16. The process of claim 15 wherein the concentration of sulphite component (i) in the eluent system is greater than 0.01 M.
17. The process of claim 16 wherein the combined concentration of sulphite component (i) in the eluent system is in the range of 0.05 to 1 M. 25 12
18. The process of claim 16 or 17 wherein sulphite component (i) includes sulphite and bisulphite ion and the combined concentration of sulphite and bisulphite ion in the eluent system is at least 0.2M.
19. The process of claim 18 wherein the combined concentration of sulphite 5 and bisulphite ion in the eluent system is in the range of 0.5 to 2M.
20. The process of any one of the preceding claims wherein the resin is an anion exchange resin, preferably a strong base anion exchange resin.
21. A process for recovering metals of claim 1 comprising the step of recovering metal species from an ion exchange resin by elution of the resin with 10 an eluent system containing hydrosulphite or a combination of (i) sulphite ions and (ii) bisulphite ions. COMMONWEALTH SCIENTIFIC AND INDUSTRIAL RESARCH ORGANISATION WATERMARK PATENT & TRADE MARK ATTORNEYS P26910AUPC
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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AU2007266303A AU2007266303B2 (en) | 2006-05-25 | 2007-05-22 | Process for recovering metals from resins |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2006902836 | 2006-05-25 | ||
AU2006902836A AU2006902836A0 (en) | 2006-05-25 | Process for recovering metals from resins | |
AU2007266303A AU2007266303B2 (en) | 2006-05-25 | 2007-05-22 | Process for recovering metals from resins |
PCT/AU2007/000702 WO2007137325A1 (en) | 2006-05-25 | 2007-05-22 | Process for recovering metals from resins |
Publications (2)
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AU2007266303A1 AU2007266303A1 (en) | 2007-12-06 |
AU2007266303B2 true AU2007266303B2 (en) | 2012-03-29 |
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AU2007266303A Ceased AU2007266303B2 (en) | 2006-05-25 | 2007-05-22 | Process for recovering metals from resins |
Country Status (6)
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US (1) | US20110011216A1 (en) |
AU (1) | AU2007266303B2 (en) |
CA (1) | CA2652825A1 (en) |
PE (1) | PE20080296A1 (en) |
WO (1) | WO2007137325A1 (en) |
ZA (1) | ZA200810032B (en) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
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CA2863875C (en) | 2010-12-07 | 2019-01-08 | Yeonuk Choi | Co-current and counter current resin-in-leach in gold leaching processes |
AR086933A1 (en) * | 2011-06-15 | 2014-01-29 | Barrick Gold Corp | METHOD FOR RECOVERING PRECIOUS METALS AND COPPER OF LIXIVIATE SOLUTIONS |
US10161016B2 (en) | 2013-05-29 | 2018-12-25 | Barrick Gold Corporation | Method for pre-treatment of gold-bearing oxide ores |
US10439146B2 (en) * | 2015-08-07 | 2019-10-08 | Semiconductor Energy Laboratory Co., Ltd. | Organic compound, light-emitting element, light-emitting device, electronic device, and lighting device |
AU2018232890A1 (en) * | 2017-12-19 | 2019-07-04 | Eco-Tec Inc. | Catalytic Regeneration of Resin for Antimony Removal |
PE20211512A1 (en) | 2019-01-21 | 2021-08-11 | Barrick Gold Corp | METHOD FOR CARBON-CATALYZED THOSULFATE LEACHING OF MATERIALS CONTAINING GOLD |
WO2020245652A1 (en) | 2019-06-03 | 2020-12-10 | Barrick Gold Corporation | Method for recovering gold from refractory materials |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
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US6632264B2 (en) * | 2001-04-17 | 2003-10-14 | The University Of British Columbia | Gold recovery from thiosulfate leaching |
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Publication number | Priority date | Publication date | Assignee | Title |
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US4758413A (en) * | 1986-11-17 | 1988-07-19 | The Dow Chemical Company | Reactive resins useful for precious metal recovery |
JP2632576B2 (en) * | 1989-05-12 | 1997-07-23 | 日鉱金属株式会社 | Desorption method of gold iodine complex from ion exchange resin |
US5294652A (en) * | 1991-12-18 | 1994-03-15 | Rainer Norman B | Process for recovering silver from photographic chemical effluent |
US6344068B1 (en) * | 2000-04-04 | 2002-02-05 | Barrick Gold Corporation | Process for recovering gold from thiosulfate leach solutions and slurries with ion exchange resin |
US6660059B2 (en) * | 2000-05-19 | 2003-12-09 | Placer Dome Technical Services Limited | Method for thiosulfate leaching of precious metal-containing materials |
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2007
- 2007-05-22 US US12/301,936 patent/US20110011216A1/en not_active Abandoned
- 2007-05-22 WO PCT/AU2007/000702 patent/WO2007137325A1/en active Application Filing
- 2007-05-22 AU AU2007266303A patent/AU2007266303B2/en not_active Ceased
- 2007-05-22 CA CA002652825A patent/CA2652825A1/en not_active Abandoned
- 2007-05-25 PE PE2007000652A patent/PE20080296A1/en not_active Application Discontinuation
-
2008
- 2008-11-25 ZA ZA200810032A patent/ZA200810032B/en unknown
Patent Citations (1)
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US6632264B2 (en) * | 2001-04-17 | 2003-10-14 | The University Of British Columbia | Gold recovery from thiosulfate leaching |
Also Published As
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US20110011216A1 (en) | 2011-01-20 |
WO2007137325A1 (en) | 2007-12-06 |
AU2007266303A1 (en) | 2007-12-06 |
CA2652825A1 (en) | 2007-12-06 |
ZA200810032B (en) | 2010-01-27 |
PE20080296A1 (en) | 2008-04-29 |
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